Kubernetes容器云平臺入門與進階
文章目錄
- Kubernetes容器云平臺入門與進階
- Kubernetes簡介
- Kubernetes特性
- 單節點Kubernetes
- Kubernetes核心概念
- Kubernetes集群部署(單節點)
- 官方提供的三種部署方式
- 自簽SSL證書
- Etcd資料庫群集部署
- Node安裝Docker
- Flannel容器群集網路部署
- 部署Master組件
- 部署Node組件
- 實驗
Kubernetes多節點
三副本機制，master最少三臺，每臺master的node最少三個，備份三份等
Kubernetes簡介
Kubernetes
Kubernetes是Google在2014年開源的一個容器群集管理系統，Kubernetes簡稱K8S，
發展：
1.mesos+zookeeper+marathon 架構
2.docker+swarm 容器群集管理
3.kubernetes 開源框架 —>二次開發 API介面 舵手（Go語言開發）
K8S用于容器化應用程式的部署，擴展和管理，
K8S提供了容器編排，資源調度，彈性伸縮，部署管理，服務發現等一系列功能，
部署管理：無狀態、有狀態—>由控制器完成，
服務發現：ETCD—>相當于分布式資料庫（自動的服務發現），（ETCD在生產環境最少三臺起步）
Kubernetes目標是讓部署容器化應用簡單高效
官方網站：http://www.kubernetes.io
Kubernetes特性
自我修復
在節點故障時重新啟動失敗的容器，替換和重新部署，保證預期的副本數量；殺死將康檢查失敗的容器，并且在為準備好之前不會處理客戶端請求，確保線上服務部中斷，
彈性伸縮
使用命令、UI或者加基于CPU使用情況自動快速擴容和縮容應用程式實體，保證應用業務高峰并發時的高可用性；業務地縫時揮手資源，以最小成本運行服務，
自動部署和回滾
K8S采用滾動更新策略更新應用，一次更新一個Pod，而不是同時洗掉所有Pod，如果封信程序中出現問題，將回滾更改，確保升級不受影響業務，
服務發現和負載均衡
K8S為多個容器提供一個統一訪問入口（管理方的入口，客戶端的入口）（內部IP地址和一個DNS名稱），并且負載均衡關聯的所有容器，使得用戶無需考慮容器IP問題，
機密和配置管理
管理機密資料和應用程式配置，而不需要吧敏感資料暴露在鏡像里，提高敏感資料安全性，并可以將一些常用的配置存盤在K8S中，方便應用程式使用，
存盤編排
掛載外部存盤系統，無論是來自本地存盤，公有云（如AWS），還是網路存盤（如NFS、GlusterFS、Ceph）都作為群集資源的一部分，幾大提高存盤使用靈活性
批處理
提供一次性任務，定時任務；滿足批量資料處理和分析的場景，
單節點Kubernetes
三個節點：master主控節點 node1 node2
kubectl 管理人員操作的操作指令
兩個node：提供業務
兩個入口：一個是客戶端訪問的，一個是管理員訪問的
兩種方式管理資源：kubectl、YAML檔案
Kubernetes核心概念
-
Pod
最小部署單元
一組容器的集合
一個Pod中的容器共享網路命名空間
Pod是短暫的 -
Controllers
ReplicaSet：確保預期的Pod副本數量
Deployment：無狀態應用部署
StatefulSet：用狀態應用部署
DaemonSet：確保所有Node節點運行在同一個Pod
Job：一次性任務
Cronjob：定時任務
更高層次物件，部署和管理Pod -
Service
防止Pod失聯
定義一組Pod的訪問策略 -
Label：標簽，附加到某個資源上，用于關聯物件、查詢和篩選
-
Namepaces：命名空間，將物件邏輯上隔離
-
Annotations：注釋
Kubernetes集群部署(單節點)
官方提供的三種部署方式
- minikube
Minkube是一個工具，可以在本地快速運行一個單點的Kubernetes，僅用于嘗試Kubernetes或日常開的用戶使用
部署地址：https://kubernetes.io/docs/setup/minikube/ - kubeadm
Kubeadm也是一個工具，提供kubeadm init和kubeadm join，用于快速部署Kubernetes集群，
部署地址：https://kubernetes.io/docs/setup-tools/kubeadm/kubeadm/ - 二進制包
推薦，從官方下載發行的二進制包，手動部署每個組件，組成Kubernetes集群
下載地址：https://github.com/kubernetes/kubernetes/releases
自簽SSL證書
etcd：ca.pem server.pem server-key.pem
flannel：ca.pem server.pem server-key.pem
kube-apiserve：ca.pem server.pem server-key.pem
kubelet：ca.pem ca-key.pem
kube-proxy：ca.pem kube-proxy.pem kube-proxy-key.pem
kubectl：ca.pem admin.pem admin-key.pem
Etcd資料庫群集部署
etcd具有以下特點：
完全復制：集群中的每個節點都可以使用完整的存檔
高可用性：Etcd可用于避免硬體的單點故障或網路問題
一致性：每次讀取都會回傳跨多主機的最新寫入
簡單：包括一個定義良好、面向用戶的API（gRPC）
快速：每秒10000次寫入的基準速度
可靠：使用Raft演算法實作強一致性、高可用服務存盤目錄
Node安裝Docker
Flannel容器群集網路部署
flannel網路組件
Overlay Network:覆寫網路，在基礎網路疊加的一種虛擬網路技術模式，該網路中的主機通過虛擬鏈路連接起來，
VXLAN:將源資料包封裝到UDP中，并使用基礎網路的IP/MAC作為外層報文頭進行封裝，然后在以太網上傳輸，到達目的地后由隧道端點解封裝并將資料發送給目標地址，
Flannel:是Overlay網路的一種，也是將源資料包封裝在另一種網路包里面進行路由轉發和通信，目前已經支持UDP、VXLAN、VPC和GCE路由等資料轉發方式，
部署Master組件
負責管理Kubernetes集群，它們管理pod的生命周期，pod是Kubernetes集群內部署的基本單元，
- kube-apiserver 主要組件，為其他master組件公開API，
- etcd 分布式密鑰/值存盤庫，Kubernetes使用它來持久化存盤所有集群資訊，
- kube-scheduler 依照pod規范中的資訊，來決定運行pod的節點，
- kube-controller-manager 負責節點管理（檢測節點是否出現故障）、pod復制和端點創建，
- cloud-controller-manager 守護行程，充當API和不同云提供商工具（存盤卷、負載均衡器等）之間的抽象層，
部署Node組件
節點組件是Kubernetes中的worker機器，受到master的管理，節點可以是虛擬機（VM）或物理機器——Kubernetes在這兩種型別的系統上都能良好運行，
每個節點都包含運行pod的必要組件：
- kubelet 為位于那個節點上的pod監視API服務器，確保它們正常運行
kubelet處理著master和在其上運行的節點之間的所有通信，它以manifest的形式接收來自主設備的命令，manifest定義著作業負載和操作引數，它與負責創建、啟動和監視pod的容器運行時進行接合，
kubelet還會周期性地對配置的活躍度探針和準備情況進行檢查，它會不斷監視pod的狀態，并在出現問題時啟動新實體，kubelet還有一個內部HTTP服務器，在埠10255上顯示一個只讀視圖，除此之外，在/healthz上還有一個健康檢查端點，以及一些其他狀態端點，例如，我們可以在/pods獲取正在運行的pod的串列，我們還可以在/spec獲取kubelet正在運行的機器的詳情， - cAdvisor 收集在特定節點上運行著的pod的相關指標
- kube-proxy 監視API服務器，實時獲取pod或服務的變化，以使網路保持最新
- kube-proxy組件在每個節點上運行，負責代理UDP、TCP和SCTP資料包（它不了解HTTP），它負責維護主機上的網路規則，并處理pod、主機和外部世界之間的資料包傳輸，它就像是節點上運行著的pod的網路代理和負載均衡器一樣，通過在iptables使用NAT實作東/西負載均衡，
容器運行時 負責管理容器鏡像，并在該節點上運行容器
實驗
所有節點清空防火墻規則和關閉核心防護
iptables -F
setenforce 0
一：環境部署
官網地址：https://github.com/kubernetes/kubernetes/releases?after=v1.13.1
二：K8S部署
環境
master:192.168.20.10 kube-apiserver kube-controller-manager kube-scheduler etcd
node1:192.168.20.20 kubelet kube-proxy docker flannel etcd
node2:192.168.20.30 kubelet kube-proxy docker flannel etcd
//證書制作
//master操作
[root@localhost ~]# hostnamectl set-hostname master
[root@localhost ~]# su
[root@master ~]# mkdir k8s
[root@master ~]# cd k8s/
[root@master k8s]# ls //從宿主機拖進來
etcd-cert.sh etcd.sh
[root@master k8s]# mkdir etcd-cert
[root@master k8s]# mv etcd-cert.sh etcd-cert
//下載證書制作工具
[root@master k8s]# cd etcd-cert/
[root@master etcd-cert]# vim cfssl.sh
curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
[root@master etcd-cert]# bash cfssl.sh //下載cfssl官方包
或
[root@master etcd-cert]# ls 下載軟體包拖入
cfssl cfssl-certinfo cfssljson etcd-cert etcd.sh
[root@master etcd-cert]# mv cfssl* /usr/local/bin/
[root@master etcd-cert]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
[root@master etcd-cert]# ls /usr/local/bin/
cfssl cfssl-certinfo cfssljson
//開始制作證書
//cfssl 生成證書工具 cfssljson通過傳入json檔案生成證書
cfssl-certinfo查看證書資訊
//定義ca證書
[root@master etcd-cert]# cat > ca-config.json <<EOF
> {
> "signing": {
> "default": {
> "expiry": "87600h"
> },
> "profiles": {
> "www": {
> "expiry": "87600h",
> "usages": [
> "signing",
> "key encipherment",
> "server auth",
> "client auth"
> ]
> }
> }
> }
> }
> EOF
//實作證書簽名
[root@master etcd-cert]# cat > ca-csr.json <<EOF
> {
> "CN": "etcd CA",
> "key": {
> "algo": "rsa",
> "size": 2048
> },
> "names": [
> {
> "C": "CN",
> "L": "Beijing",
> "ST": "Beijing"
> }
> ]
> }
> EOF
//生成證書，生成ca-key.pem ca.pem
[root@master etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2020/09/28 16:11:29 [INFO] generating a new CA key and certificate from CSR
2020/09/28 16:11:29 [INFO] generate received request
2020/09/28 16:11:29 [INFO] received CSR
2020/09/28 16:11:29 [INFO] generating key: rsa-2048
2020/09/28 16:11:30 [INFO] encoded CSR
2020/09/28 16:11:30 [INFO] signed certificate with serial number 307109152987071081700641248999918396111229161596
//指定etcd三個節點之間的通信驗證
[root@master etcd-cert]# cat > server-csr.json <<EOF
> {
> "CN": "etcd",
> "hosts": [
> "192.168.20.10", //master地址
> "192.168.20.20", //node1地址
> "192.168.20.30" //node2地址
> ],
> "key": {
> "algo": "rsa",
> "size": 2048
> },
> "names": [ //名字要和上面定義的一樣
> {
> "C": "CN",
> "L": "BeiJing",
> "ST": "BeiJing"
> }
> ]
> }
> EOF
//生成ETCD證書 server-key.pem server.pem
[root@master etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
2020/09/28 16:12:52 [INFO] generate received request
2020/09/28 16:12:52 [INFO] received CSR
2020/09/28 16:12:52 [INFO] generating key: rsa-2048
2020/09/28 16:12:52 [INFO] encoded CSR
2020/09/28 16:12:52 [INFO] signed certificate with serial number 538862372957746116117729195241060280056748061751
2020/09/28 16:12:52 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
//ETCD 二進制包地址 https://github.com/etcd-io/etcd/releases
//拖入flannel-v0.10.0-linux-amd64.tar.gz、etcd-v3.3.10-linux-amd64.tar.gz、kubernetes-server-linux-amd64.tar.gz
[root@master etcd-cert]# ls
ca-config.json etcd-cert.sh server-csr.json
ca.csr etcd-v3.3.10-linux-amd64.tar.gz server-key.pem
ca-csr.json flannel-v0.10.0-linux-amd64.tar.gz server.pem
ca-key.pem kubernetes-server-linux-amd64.tar.gz
ca.pem server.csr
[root@master etcd-cert]# mv *.tar.gz ../
[root@master etcd-cert]# cd ..
[root@master k8s]# ls
cfssl.sh etcd.sh flannel-v0.10.0-linux-amd64.tar.gz
etcd-cert etcd-v3.3.10-linux-amd64.tar.gz kubernetes-server-linux-amd64.tar.gz
//解壓etcd-v3.3.10-linux-amd64.tar.gz
[root@master k8s]# tar zxvf etcd-v3.3.10-linux-amd64.tar.gz
[root@master k8s]# ls etcd-v3.3.10-linux-amd64
Documentation etcd etcdctl README-etcdctl.md README.md READMEv2-etcdctl.md
//創建目錄——組態檔，命令檔案，證書
[root@master k8s]# mkdir /opt/etcd/{cfg,bin,ssl} -p
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcd etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/
//證書拷貝
[root@master k8s]# cp etcd-cert/*.pem /opt/etcd/ssl/
//進入卡住狀態等待其他節點加入
[root@master k8s]# bash etcd.sh etcd01 192.168.20.10 etcd02=https://192.168.20.20:2380,etcd03=https://192.168.20.30:2380
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.
//再使用另外一個會話打開，會發現etcd行程已經開啟
[root@master k8s]# ps -ef | grep etcd
root 22521 1 2 16:41 ? 00:00:01 /opt/etcd/bin/etcd --name=etcd01 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.20.10:2380 --listen-client-urls=https://192.168.20.10:2379,http://127.0.0.1:2379 --advertise-client-urls=https://192.168.20.10:2379 --initial-advertise-peer-urls=https://192.168.20.10:2380 --initial-cluster=etcd01=https://192.168.20.10:2380,etcd02=https://192.168.20.20:2380,etc03=https://192.168.20.30:2380 --initial-cluster-token=etcd-cluster --initial-cluster-state=new --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem --peer-cert-file=/opt/etcd/ssl/server.pem --peer-key-file=/opt/etcd/ssl/server-key.pem --trusted-ca-file=/opt/etcd/ssl/ca.pem --peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
root 22534 22330 0 16:42 pts/2 00:00:00 grep --color=auto etcd
//拷貝證書到node節點
[root@master k8s]# scp -r /opt/etcd/ root@192.168.20.20:/opt/
The authenticity of host '192.168.20.20 (192.168.20.20)' can't be established.
ECDSA key fingerprint is SHA256:M+6YSK2hm7e8JY4G1qYmT0X1UmIr280vvpa+1rW8IBc.
ECDSA key fingerprint is MD5:bd:01:e2:85:f0:b0:36:8c:49:64:08:30:6c:2d:a4:37.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.20.20' (ECDSA) to the list of known hosts.
root@192.168.20.20's password:
etcd 100% 509 237.4KB/s 00:00
etcd 100% 18MB 71.0MB/s 00:00
etcdctl 100% 15MB 81.1MB/s 00:00
ca-key.pem 100% 1679 1.0MB/s 00:00
ca.pem 100% 1265 1.4MB/s 00:00
server-key.pem 100% 1675 1.4MB/s 00:00
server.pem 100% 1338 1.8MB/s 00:00
[root@master k8s]# scp -r /opt/etcd/ root@192.168.20.30:/opt/
The authenticity of host '192.168.20.30 (192.168.20.30)' can't be established.
ECDSA key fingerprint is SHA256:YI9QBe63U8Cgwvdpz0mTaUAPrBP7p0NRMbrujvLhYm8.
ECDSA key fingerprint is MD5:2a:d0:1b:eb:fb:50:3f:a4:f4:f0:a0:59:9b:97:e5:55.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.20.30' (ECDSA) to the list of known hosts.
root@192.168.20.30's password:
etcd 100% 509 335.8KB/s 00:00
etcd 100% 18MB 81.8MB/s 00:00
etcdctl 100% 15MB 75.6MB/s 00:00
ca-key.pem 100% 1679 351.1KB/s 00:00
ca.pem 100% 1265 316.3KB/s 00:00
server-key.pem 100% 1675 1.2MB/s 00:00
server.pem 100% 1338 805.8KB/s 00:00
//拷貝啟動腳本到node節點
[root@master k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.20.20:/usr/lib/systemd/system/
root@192.168.20.20's password:
etcd.service 100% 923 283.8KB/s 00:00
[root@master k8s]# scp /usr/lib/systemd/system/etcd.service root@192.168.20.30:/usr/lib/systemd/system/
root@192.168.20.30's password:
etcd.service
//在node1節點修改
[root@localhost ~]# hostnamectl set-hostname node1
[root@localhost ~]# su
[root@node1 ~]# vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd02" //名字改成etcd02
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.20.20:2380" //地址改成自己的地址
ETCD_LISTEN_CLIENT_URLS="https://192.168.20.20:2379" //地址改成自己的地址
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.20.20:2380" //地址改成自己的地址
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.20.20:2379" //地址改成自己的地址
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.20.10:2380,etcd02=https://192.168.20.20:2380,etcd03=https://192.168.20.30:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
//在node2節點修改
[root@localhost ~]# hostnamectl set-hostname node2
[root@localhost ~]# su
[root@node2 ~]# vim /opt/etcd/cfg/etcd
#[Member]
ETCD_NAME="etcd03" //名字改成etcd03
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.20.30:2380" //地址改成自己的地址
ETCD_LISTEN_CLIENT_URLS="https://192.168.20.30:2379" //地址改成自己的地址
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.20.30:2380" //地址改成自己的地址
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.20.30:2379" //地址改成自己的地址
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.20.10:2380,etcd02=https://192.168.20.20:2380,etcd03=https://192.168.20.30:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
//啟動
[root@master k8s]# bash etcd.sh etcd01 192.168.20.10 etcd02=https://192.168.20.20:2380,etcd03=https://192.168.20.30:2380
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.
[root@node1 ~]# systemctl start etcd.service
[root@node2 ~]# systemctl start etcd.service
//查看資訊
[root@master k8s]# systemctl status etcd
● etcd.service - Etcd Server
Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)
Active: active (running) since 一 2020-09-28 17:23:02 CST; 55s ago
Main PID: 78752 (etcd)
Tasks: 13
CGroup: /system.slice/etcd.service
└─78752 /opt/etcd/bin/etcd --name=etcd01 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.20.10...
...
[root@node1 ~]# systemctl status etcd
● etcd.service - Etcd Server
Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
Active: active (running) since 一 2020-09-28 17:22:50 CST; 2min 14s ago
Main PID: 22277 (etcd)
Tasks: 13
CGroup: /system.slice/etcd.service
└─22277 /opt/etcd/bin/etcd --name=etcd02 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.20.2...
...
[root@node2 ~]# systemctl status etcd
● etcd.service - Etcd Server
Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
Active: active (running) since 一 2020-09-28 17:22:53 CST; 2min 16s ago
Main PID: 22366 (etcd)
Tasks: 14
CGroup: /system.slice/etcd.service
└─22366 /opt/etcd/bin/etcd --name=etcd03 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.20.3...
...
//檢查群集健康狀態
[root@master k8s]# cd etcd-cert/
[root@master etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379" cluster-health
member 350b6ab68923a8a2 is healthy: got healthy result from https://192.168.20.20:2379
member 51ae3f86f3783687 is healthy: got healthy result from https://192.168.20.10:2379
member c05141f45e08d8ff is healthy: got healthy result from https://192.168.20.30:2379
cluster is healthy
//3.docker引擎部署——所有node節點部署docker引擎
node1和node2節點安裝docker
//4.flannel網路配置
//寫入分配的子網段到ETCD中，供flannel使用
[root@master etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379" set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}
//查看寫入的資訊
[root@master etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379" get /coreos.com/network/config
{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}
//拷貝到所有node節點（只需要部署在node節點即可）
[root@master etcd-cert]# scp flannel-v0.10.0-linux-amd64.tar.gz root@192.168.1^Croot
[root@master etcd-cert]# cd ..
[root@master k8s]# scp flannel-v0.10.0-linux-amd64.tar.gz root@192.168.20.20:/root
root@192.168.20.20's password:
flannel-v0.10.0-linux-amd64.tar.gz 100% 9479KB 55.8MB/s 00:00
[root@master k8s]# scp flannel-v0.10.0-linux-amd64.tar.gz root@192.168.20.30:/root
root@192.168.20.30's password:
flannel-v0.10.0-linux-amd64.tar.gz 100% 9479KB 35.8MB/s 00:00
//所有node節點操作（這里只展示node1的操作）
//解壓
[root@node1 ~]# tar zxvf flannel-v0.10.0-linux-amd64.tar.gz
flanneld
mk-docker-opts.sh
README.md
//創建k8s作業目錄
[root@node1 ~]# mkdir /opt/kubernetes/{cfg,bin,ssl} -p
[root@node1 ~]# mv mk-docker-opts.sh flanneld /opt/kubernetes/bin/
//撰寫flannel的腳本
[root@node1 ~]# vim flannel.sh
#!/bin/bash
ETCD_ENDPOINTS=${1:-"http://127.0.0.1:2379"}
cat <<EOF >/opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=${ETCD_ENDPOINTS} \
-etcd-cafile=/opt/etcd/ssl/ca.pem \
-etcd-certfile=/opt/etcd/ssl/server.pem \
-etcd-keyfile=/opt/etcd/ssl/server-key.pem"
EOF
cat <<EOF >/usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service
[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq \$FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable flanneld
systemctl restart flanneld
//開啟flannel網路功能
[root@node1 ~]# bash flannel.sh https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379
Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service.
//配置docker連接flannel
[root@node1 ~]# vim /usr/lib/systemd/system/docker.service
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
[root@node1 ~]# cat /run/flannel/subnet.env
DOCKER_OPT_BIP="--bip=172.17.39.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=false"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_NETWORK_OPTIONS=" --bip=172.17.39.1/24 --ip-masq=false --mtu=1450"
//重啟docker服務
[root@node1 ~]# systemctl daemon-reload
[root@node1 ~]# systemctl restart docker
//查看flannel網路
[root@node1 ~]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.39.1 netmask 255.255.255.0 broadcast 172.17.39.255
ether 02:42:9e:5b:d5:d1 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.20.20 netmask 255.255.255.0 broadcast 192.168.20.255
inet6 fe80::f0c9:c17f:3e56:9bf5 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:ac:fe:ba txqueuelen 1000 (Ethernet)
RX packets 361114 bytes 227105212 (216.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 261561 bytes 29704749 (28.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
flannel.1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450
inet 172.17.39.0 netmask 255.255.255.255 broadcast 0.0.0.0
inet6 fe80::2062:10ff:fe72:d64d prefixlen 64 scopeid 0x20<link>
ether 22:62:10:72:d6:4d txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 38 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 810 bytes 55986 (54.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 810 bytes 55986 (54.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:7e:c1:42 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
//測驗ping通對方docker0網卡 證明flannel起到路由作用
[root@node1 ~]# docker run -it centos:7 /bin/bash
Unable to find image 'centos:7' locally
7: Pulling from library/centos
75f829a71a1c: Pull complete
Digest: sha256:19a79828ca2e505eaee0ff38c2f3fd9901f4826737295157cc5212b7a372cd2b
Status: Downloaded newer image for centos:7
[root@2ab5e936498a /]# yum install net-tools -y
[root@2ab5e936498a /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450
inet 172.17.39.2 netmask 255.255.255.0 broadcast 172.17.39.255
ether 02:42:ac:11:27:02 txqueuelen 0 (Ethernet)
RX packets 16290 bytes 12483008 (11.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7815 bytes 425422 (415.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@node2 ~]# docker run -it centos:7 /bin/bash
Unable to find image 'centos:7' locally
7: Pulling from library/centos
75f829a71a1c: Pull complete
Digest: sha256:19a79828ca2e505eaee0ff38c2f3fd9901f4826737295157cc5212b7a372cd2b
Status: Downloaded newer image for centos:7
[root@c72893bc9690 /]# yum install net-tools -y
[root@c72893bc9690 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450
inet 172.17.63.2 netmask 255.255.255.0 broadcast 172.17.63.255
ether 02:42:ac:11:3f:02 txqueuelen 0 (Ethernet)
RX packets 16264 bytes 12482650 (11.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7783 bytes 423626 (413.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@2ab5e936498a /]# ping 172.17.63.2
PING 172.17.63.2 (172.17.63.2) 56(84) bytes of data.
64 bytes from 172.17.63.2: icmp_seq=1 ttl=62 time=2.55 ms
64 bytes from 172.17.63.2: icmp_seq=2 ttl=62 time=4.69 ms
64 bytes from 172.17.63.2: icmp_seq=3 ttl=62 time=0.383 ms
^C
--- 172.17.63.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2006ms
rtt min/avg/max/mdev = 0.383/2.542/4.695/1.761 ms
[root@c72893bc9690 /]# ping 172.17.39.2
PING 172.17.39.2 (172.17.39.2) 56(84) bytes of data.
64 bytes from 172.17.39.2: icmp_seq=1 ttl=62 time=2.02 ms
64 bytes from 172.17.39.2: icmp_seq=2 ttl=62 time=0.917 ms
64 bytes from 172.17.39.2: icmp_seq=3 ttl=62 time=0.751 ms
^C
--- 172.17.39.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.751/1.231/2.027/0.567 ms
部署master組件
//在master上操作，api-server生成證書
拖入 master.zip壓縮包到/root/k8s目錄下
[root@master k8s]# ls
cfssl.sh etcd-v3.3.10-linux-amd64 kubernetes-server-linux-amd64.tar.gz
etcd-cert etcd-v3.3.10-linux-amd64.tar.gz master.zip
etcd.sh flannel-v0.10.0-linux-amd64.tar.gz
[root@master k8s]# unzip master.zip
[root@master k8s]# mkdir /opt/kubernetes/{cfg,bin,ssl} -p
[root@master k8s]# mkdir k8s-cert
[root@master k8s]# cd k8s-cert/
拖入k8s-cert.sh腳本
[root@master k8s-cert]# ls
k8s-cert.sh
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
cat > ca-csr.json <<EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
#-----------------------
cat > server-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.20.10", //master1
"192.168.20.40", //master2
"192.168.20.111", //vip
"192.168.20.50", //lb （master）
"192.168.20.60", //lb （backup）
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
#-----------------------
cat > admin-csr.json <<EOF
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
#-----------------------
cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-pro
xy
//生成k8s證書
[root@master k8s-cert]# bash k8s-cert.sh
2020/09/29 15:20:27 [INFO] generating a new CA key and certificate from CSR
2020/09/29 15:20:27 [INFO] generate received request
2020/09/29 15:20:27 [INFO] received CSR
2020/09/29 15:20:27 [INFO] generating key: rsa-2048
2020/09/29 15:20:28 [INFO] encoded CSR
2020/09/29 15:20:28 [INFO] signed certificate with serial number 572092143940477158442975741908760581653757414586
2020/09/29 15:20:28 [INFO] generate received request
2020/09/29 15:20:28 [INFO] received CSR
2020/09/29 15:20:28 [INFO] generating key: rsa-2048
2020/09/29 15:20:28 [INFO] encoded CSR
2020/09/29 15:20:28 [INFO] signed certificate with serial number 645411198364777330575133409297661007151065267201
2020/09/29 15:20:28 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
2020/09/29 15:20:28 [INFO] generate received request
2020/09/29 15:20:28 [INFO] received CSR
2020/09/29 15:20:28 [INFO] generating key: rsa-2048
2020/09/29 15:20:28 [INFO] encoded CSR
2020/09/29 15:20:28 [INFO] signed certificate with serial number 382185722811839684332683631495065868107644288788
2020/09/29 15:20:28 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
2020/09/29 15:20:28 [INFO] generate received request
2020/09/29 15:20:28 [INFO] received CSR
2020/09/29 15:20:28 [INFO] generating key: rsa-2048
2020/09/29 15:20:29 [INFO] encoded CSR
2020/09/29 15:20:29 [INFO] signed certificate with serial number 54367561030861349163097338268655276544563898262
2020/09/29 15:20:29 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@master k8s-cert]# ls *.pem
admin-key.pem ca-key.pem kube-proxy-key.pem server-key.pem
admin.pem ca.pem kube-proxy.pem server.pem
[root@master k8s-cert]# cp ca*pem server*pem /opt/kubernetes/ssl/
[root@master k8s-cert]# cd ..
//解壓kubernetes壓縮包
[root@master k8s]# tar zxvf kubernetes-server-linux-amd64.tar.gz
//復制關鍵命令檔案
[root@master k8s]# cd /root/k8s/kubernetes/server/bin
[root@master bin]# ls
apiextensions-apiserver kube-controller-manager.tar
cloud-controller-manager kubectl
cloud-controller-manager.docker_tag kubelet
cloud-controller-manager.tar kube-proxy
hyperkube kube-proxy.docker_tag
kubeadm kube-proxy.tar
kube-apiserver kube-scheduler
kube-apiserver.docker_tag kube-scheduler.docker_tag
kube-apiserver.tar kube-scheduler.tar
kube-controller-manager mounter
kube-controller-manager.docker_tag
[root@master bin]# cp kube-apiserver kubectl kube-controller-manager kube-scheduler /opt/kubernetes/bin/
[root@master bin]# cd /root/k8s/
[root@master k8s]# head -c 16 /dev/urandom | od -An -t x | tr -d ' ' //隨機生成序列號
7c0a6952689f0769225e08a5d1f705b2
[root@master k8s]# vim /opt/kubernetes/cfg/token.csv
7c0a6952689f0769225e08a5d1f705b2,kubelet-bootstrap,10001,"system:kubelet-bootstrap" //序列號，用戶名，id，角色
//二進制檔案，token，證書都準備好，開啟apiserver
[root@master k8s]# bash apiserver.sh 192.168.20.10 https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-apiserver.service to /usr/lib/systemd/system/kube-apiserver.service.
//檢查行程是否啟動成功
[root@master k8s]# ps aux | grep kube-apiserver
//查看組態檔
[root@master k8s]# cat /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379 \
--bind-address=192.168.20.10 \
--secure-port=6443 \
--advertise-address=192.168.20.10 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--kubelet-https=true \
--enable-bootstrap-token-auth \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/opt/kubernetes/ssl/server.pem \
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \
--client-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/opt/etcd/ssl/ca.pem \
--etcd-certfile=/opt/etcd/ssl/server.pem \
--etcd-keyfile=/opt/etcd/ssl/server-key.pem"
//監聽的https埠
[root@master k8s]# netstat -ntap | grep 6443
tcp 0 0 192.168.20.10:6443 0.0.0.0:* LISTEN 80347/kube-apiserve
tcp 0 0 192.168.20.10:6443 192.168.20.10:58068 ESTABLISHED 80347/kube-apiserve
tcp 0 0 192.168.20.10:58068 192.168.20.10:6443 ESTABLISHED 80347/kube-apiserve
[root@master k8s]# netstat -ntap | grep 8080
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 80347/kube-apiserve
//啟動scheduler服務
[root@master k8s]# ./scheduler.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.
[root@master k8s]# chmod +x controller-manager.sh
//啟動controller-manager
[root@master k8s]# ./controller-manager.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.
//查看master節點狀態
[root@master k8s]# /opt/kubernetes/bin/kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-2 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
node節點部署
//master上操作
//把kubelet、kube-proxy拷貝到node節點上去
[root@master k8s]# cd kubernetes/server/bin/
[root@master bin]# scp kubelet kube-proxy root@192.168.20.20:/opt/kubernetes/bin/
root@192.168.20.20's password:
kubelet 100% 168MB 60.4MB/s 00:02
kube-proxy 100% 48MB 59.5MB/s 00:00
root@master bin]# scp kubelet kube-proxy root@192.168.20.30:/opt/kubernetes/bin/
root@192.168.20.30's password:
kubelet 100% 168MB 96.8MB/s 00:01
kube-proxy 100% 48MB 96.0MB/s 00:00
//node節點上操作（復制node.zip到/root目錄下）
[root@node1 ~]# ls
anaconda-ks.cfg flannel-v0.10.0-linux-amd64.tar.gz node.zip 公共 視頻 檔案 音樂
flannel.sh initial-setup-ks.cfg README.md 模板 圖片 下載 桌面
[root@node1 ~]# unzip node.zip
Archive: node.zip
inflating: proxy.sh
inflating: kubelet.sh
//在master上操作
[root@master bin]# cd /root/k8s
[root@master k8s]# mkdir kubeconfig
[root@master k8s]# cd kubeconfig
//拷貝kubeconfig.sh檔案進行重命名
[root@master kubeconfig]# ls
kubeconfig.sh
[root@master kubeconfig]# mv kubeconfig.sh kubeconfig
[root@master kubeconfig]# vim kubeconfig
洗掉以下部分
# 創建 TLS Bootstrapping Token
#BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
BOOTSTRAP_TOKEN=0fb61c46f8991b718eb38d27b605b008
cat > token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
//獲取token資訊(復制下前面的序列號)
[root@master kubeconfig]# cat /opt/kubernetes/cfg/token.csv
7c0a6952689f0769225e08a5d1f705b2,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
//組態檔修改為tokenID
[root@master kubeconfig]# vim kubeconfig
#----------------------
APISERVER=$1
SSL_DIR=$2
# 創建kubelet bootstrapping kubeconfig
export KUBE_APISERVER="https://$APISERVER:6443"
# 設定集群引數
kubectl config set-cluster kubernetes \
--certificate-authority=$SSL_DIR/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=bootstrap.kubeconfig
# 設定客戶端認證引數
kubectl config set-credentials kubelet-bootstrap \
--token=7c0a6952689f0769225e08a5d1f705b2 \ //這里輸入復制的序列號
--kubeconfig=bootstrap.kubeconfig
# 設定背景關系引數
kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=bootstrap.kubeconfig
# 設定默認背景關系
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
#----------------------
# 創建kube-proxy kubeconfig檔案
kubectl config set-cluster kubernetes \
--certificate-authority=$SSL_DIR/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
--client-certificate=$SSL_DIR/kube-proxy.pem \
--client-key=$SSL_DIR/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
//設定環境變數
[root@master kubeconfig]# vim /etc/profile
在最后一行后插入
export PATH=$PATH:/opt/kubernetes/bin/
[root@master kubeconfig]# source /etc/profile
[root@master kubeconfig]# kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-2 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
//生成組態檔bootstrap.kubeconfig、kube-proxy.kubeconfig
[root@master kubeconfig]# bash kubeconfig 192.168.20.10 /root/k8s/k8s-cert/
Cluster "kubernetes" set.
User "kubelet-bootstrap" set.
Context "default" created.
Switched to context "default".
Cluster "kubernetes" set.
User "kube-proxy" set.
Context "default" created.
Switched to context "default".
[root@master kubeconfig]# ls
bootstrap.kubeconfig kubeconfig kube-proxy.kubeconfig
//拷貝組態檔到node節點
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.20.20:/opt/kubernetes/cfg/
root@192.168.20.20's password:
bootstrap.kubeconfig 100% 2167 1.4MB/s 00:00
kube-proxy.kubeconfig 100% 6273 1.2MB/s 00:00
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.20.30:/opt/kubernetes/cfg/
root@192.168.20.30's password:
bootstrap.kubeconfig 100% 2167 1.2MB/s 00:00
kube-proxy.kubeconfig 100% 6273 4.9MB/s 00:00
//創建bootstrap角色賦予權限用于連接apiserver請求簽名
[root@master kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
//在node01節點上操作
[root@node1 ~]# bash kubelet.sh 192.168.20.20
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
//檢查kubelet服務啟動
[root@node1 ~]# bash kubelet.sh 192.168.20.20
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node1 ~]# ps -aux | grep kube
root 79703 0.1 0.4 399640 18088 ? Ssl 14:23 0:22 /opt/kubernetes/bin/flanneld --ip-masq --etcd-endpoints=https://192.168.20.10:2379,https://192.168.20.20:2379,https://192.168.20.30:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem
root 97400 1.0 1.1 534300 42548 ? Ssl 17:30 0:00 /opt/kubernetes/bin/kubelet --logtostderr=true --v=4 --hostname-override=192.168.20.20 --kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig --bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig --config=/opt/kubernetes/cfg/kubelet.config --cert-dir=/opt/kubernetes/ssl --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0
root 97465 0.0 0.0 112728 984 pts/2 S+ 17:31 0:00 grep --color=auto kube
//master上操作
//檢查到node01節點的請求
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY 2m1s kubelet-bootstrap Pending
[root@master kubeconfig]# kubectl certificate approve node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY
certificatesigningrequest.certificates.k8s.io/node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY approved
//kubectl certificate
approve 同意一個自簽證書請求
deny 拒絕一個自簽證書請求
//繼續查看證書狀態
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY 3m11s kubelet-bootstrap Approved,Issued
//Pending等待集群給該節點頒發證書 Approved,Issued已經被允許加入群集
//查看群集節點，成功加入node01節點
[root@master kubeconfig]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
192.168.20.20 Ready <none> 68s v1.12.3
//在node01節點操作，啟動proxy服務
[root@node1 ~]# bash proxy.sh 192.168.20.20
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node1 ~]# systemctl status kube-proxy.service
● kube-proxy.service - Kubernetes Proxy
Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
Active: active (running) since 二 2020-09-29 17:35:57 CST; 1min 24s ago
Main PID: 98700 (kube-proxy)
Tasks: 0
Memory: 7.8M
CGroup: /system.slice/kube-proxy.service
? 98700 /opt/kubernetes/bin/kube-proxy --logtostderr=true --v=4 --hostname-...
9月 29 17:37:12 node1 kube-proxy[98700]: I0929 17:37:12.263279 98700 config.go:14...te
9月 29 17:37:13 node1 kube-proxy[98700]: I0929 17:37:13.437384 98700 config.go:14...te
9月 29 17:37:14 node1 kube-proxy[98700]: I0929 17:37:14.277055 98700 config.go:14...te
9月 29 17:37:15 node1 kube-proxy[98700]: I0929 17:37:15.451517 98700 config.go:14...te
9月 29 17:37:16 node1 kube-proxy[98700]: I0929 17:37:16.287927 98700 config.go:14...te
9月 29 17:37:17 node1 kube-proxy[98700]: I0929 17:37:17.464773 98700 config.go:14...te
9月 29 17:37:18 node1 kube-proxy[98700]: I0929 17:37:18.296889 98700 config.go:14...te
9月 29 17:37:19 node1 kube-proxy[98700]: I0929 17:37:19.474728 98700 config.go:14...te
9月 29 17:37:20 node1 kube-proxy[98700]: I0929 17:37:20.308835 98700 config.go:14...te
9月 29 17:37:21 node1 kube-proxy[98700]: I0929 17:37:21.489116 98700 config.go:14...te
Hint: Some lines were ellipsized, use -l to show in full.
//node02節點部署
//在node01節點操作
//把現成的/opt/kubernetes目錄復制到其他節點進行修改即可
[root@node1 ~]# scp -r /opt/kubernetes/ root@192.168.20.30:/opt/
The authenticity of host '192.168.20.30 (192.168.20.30)' can't be established.
ECDSA key fingerprint is SHA256:YI9QBe63U8Cgwvdpz0mTaUAPrBP7p0NRMbrujvLhYm8.
ECDSA key fingerprint is MD5:2a:d0:1b:eb:fb:50:3f:a4:f4:f0:a0:59:9b:97:e5:55.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.20.30' (ECDSA) to the list of known hosts.
root@192.168.20.30's password:
flanneld 100% 235 209.8KB/s 00:00
bootstrap.kubeconfig 100% 2167 1.7MB/s 00:00
kube-proxy.kubeconfig 100% 6273 5.1MB/s 00:00
kubelet 100% 377 257.4KB/s 00:00
kubelet.config 100% 267 75.5KB/s 00:00
kubelet.kubeconfig 100% 2296 2.1MB/s 00:00
kube-proxy 100% 189 167.6KB/s 00:00
mk-docker-opts.sh 100% 2139 1.6MB/s 00:00
scp: /opt//kubernetes/bin/flanneld: Text file busy
kubelet 100% 168MB 106.7MB/s 00:01
kube-proxy 100% 48MB 113.7MB/s 00:00
kubelet.crt 100% 2185 2.1MB/s 00:00
kubelet.key 100% 1675 646.4KB/s 00:00
kubelet-client-2020-09-29-17-33-26.pem 100% 1273 273.7KB/s 00:00
kubelet-client-current.pem 100% 1273 304.1KB/s 00:00
//把kubelet，kube-proxy的service檔案拷貝到node2中
[root@node1 ~]# scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.20.30:/usr/lib/systemd/system/
root@192.168.20.30's password:
kubelet.service 100% 264 136.6KB/s 00:00
kube-proxy.service 100% 231 143.8KB/s 00:00
//在node02上操作，進行修改
//首先洗掉復制過來的證書，等會node02會自行申請證書
[root@node2 ~]# cd /opt/kubernetes/ssl/
[root@node2 ssl]# rm -rf *
//修改組態檔kubelet kubelet.config kube-proxy
[root@node2 ssl]# cd ../cfg
[root@node2 cfg]# vim kubelet
KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.20.30 \ //這里改成自己的地址
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/kubernetes/cfg/kubelet.config \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
[root@node2 cfg]# vim kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.20.30 //這里改成自己的地址
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local.
failSwapOn: false
authentication:
anonymous:
enabled: true
[root@node2 cfg]# vim kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.20.30 \ //這里改成自己的地址
--cluster-cidr=10.0.0.0/24 \
--proxy-mode=ipvs \
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"
//啟動服務
[root@node2 cfg]# systemctl start kubelet.service
[root@node2 cfg]# systemctl enable kubelet.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@node2 cfg]# systemctl start kube-proxy.service
[root@node2 cfg]# systemctl enable kube-proxy.service
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
//在master上操作查看請求
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY 41m kubelet-bootstrap Approved,Issued
node-csr-rfpP-a8Z8anqv5yxrR-cdcpO98QHjo7EAkqUXPElscE 117s kubelet-bootstrap Pending //復制序列號
//授權許可加入群集
[root@master kubeconfig]# kubectl certificate approve node-csr-rfpP-a8Z8anqv5yxrR-cdcpO98QHjo7EAkqUXPElscE
certificatesigningrequest.certificates.k8s.io/node-csr-rfpP-a8Z8anqv5yxrR-cdcpO98QHjo7EAkqUXPElscE approved
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-5VZZo63-AZcdMyqaRZ6IiQbdprnkWP7GyBWqDGfIAwY 42m kubelet-bootstrap Approved,Issued
node-csr-rfpP-a8Z8anqv5yxrR-cdcpO98QHjo7EAkqUXPElscE 2m45s kubelet-bootstrap Approved,Issued
//查看群集中的節點
[root@master kubeconfig]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
192.168.20.20 Ready <none> 39m v1.12.3
192.168.20.30 Ready <none> 12s v1.12.3
[root@node2 cfg]# systemctl status kube-proxy.service
● kube-proxy.service - Kubernetes Proxy
Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
Active: active (running) since 二 2020-09-29 18:11:15 CST; 16min ago
Main PID: 99461 (kube-proxy)
CGroup: /system.slice/kube-proxy.service
? 99461 /opt/kubernetes/bin/kube-proxy --logtostderr=true --v=4 --hostname-override=192.168.20.30 --cluster-cidr=10.0.0.0/24 --p...
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.360327 99461 iptables.go:327] running iptables-save [-t filter]
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.362421 99461 iptables.go:327] running iptables-save [-t nat]
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.435050 99461 proxier.go:1472] Bind addr 10.0.0.1
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.458144 99461 iptables.go:391] running iptables-restore [-w 5 --noflush --counters]
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.461366 99461 proxier.go:672] syncProxyRules took 101.094914ms
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.461402 99461 bounded_frequency_runner.go:221] sync-runner: ran, next poss... in 30s
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.903731 99461 config.go:141] Calling handler.OnEndpointsUpdate
9月 29 18:27:19 node2 kube-proxy[99461]: I0929 18:27:19.932189 99461 config.go:141] Calling handler.OnEndpointsUpdate
9月 29 18:27:21 node2 kube-proxy[99461]: I0929 18:27:21.917556 99461 config.go:141] Calling handler.OnEndpointsUpdate
9月 29 18:27:21 node2 kube-proxy[99461]: I0929 18:27:21.941538 99461 config.go:141] Calling handler.OnEndpointsUpdate
Hint: Some lines were ellipsized, use -l to show in full.
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