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前言
運維之基礎——Linux，我是一個即將畢業的大學生，超超，如果你也在學習Linux，不妨跟著萌新超超一起學習Linux，拿下Linux，一起加油，共同努力，拿到理想offer！
系列文章
Linux進階 | docker compose的安裝與使用詳解，超詳細！
Linux進階 | Docker部署nginx的web服務，VOLUME的使用詳解，實作資料持久化！
Linux進階 | 2萬字總結最詳細的Docker的安裝、底層隔離機制和簡單使用！
Linux | 詳解系統監控和常用命令（top free dstat）
概述
Docker 屬于 Linux 容器的一種封裝，提供簡單易用的容器使用介面，它是目前最流行的 Linux 容器解決方案，本期內容為Docker第五期，通過本期內容將會掌握集群的概念，以及swarm的安裝部署，以及swarm和compose以及volume的結合，
目錄
前言
概述
超超Docker學習思維導圖
集群（cluster）
集群的優勢
swarm(蜂群)的概念
什么是swarm
swarm與compose
swarm與k8s
swarm的優勢
swarm的基本結構
swarm的關鍵點
swarm的使用綱要
swarm的使用
swarm的其他命令
swarm集群部署web服務
思考：swarm manager 是通過什么方式和swarm node進行通信的？
鏡像的滾動升級操作
結合compose和swarm進行多服務的編排
compose和swarm結合有什么優勢
代碼實體部署
Swarm中使用Volume
問題：如何解決web服務的網頁保持一致？
超超Docker學習思維導圖
集群（cluster）
多臺機器完成某個功能，計算機集群簡稱集群，是一種計算機系統，它通過一組松散集成的計算機軟體(和/或)硬體連接起來高度緊密地協作完成計算作業，
舉個生活實體：單點（非集群）模式，就類似銀行只開放一個視窗來辦理業務，而通過建立集群，就相當于一個銀行開通多個視窗辦理業務，那么這樣不僅能提高辦事效率，還能減少風險，
集群的優勢
高可伸縮性：服務器集群具有很強的可伸縮性，隨著需求和負荷的增長，可以向集群系統添加更多的服務器，在這樣的配置中，可以有多臺服務器執行相同的應用和資料庫操作，
高可用性：高可用性是指，在不需要操作者干預的情況下，防止系統發生故障或從故障中自動恢復的能力，通過把故障服務器上的應用程式轉移到備份服務器上運行，集群系統能夠把正常運行時間提高到大于99.9%，大大減少服務器和應用程式的停機時間，
高可管理性：系統管理員可以從遠程管理一個、甚至一組集群，就好像在單機系統中一樣，
swarm(蜂群)的概念
什么是swarm
對多臺安裝了Docker的宿主機上的容器進行編排，
Swarm是Docker官方提供的一款集群管理工具，其主要作用是把若干臺Docker主機抽象為一個整體，并且通過一個入口統一管理這些Docker主機上的各種Docker資源，
一個 swarm 由多個 Docker 主機組成，它們以swarm 模式運行并充當管理器（管理成員資格和委派）和作業器（運行 swarm 服務），
一個給定的 Docker 主機可以是管理者、作業者，或同時扮演這兩個角色，
swarm與compose
Docker Swarm 和 Docker Compose 一樣，都是 Docker 官方容器編排專案，但不同的是，Docker Compose 是在一個單個服務器或主機上創建多個容器的工具，而 Docker Swarm 則可以在多個服務器或主機上創建容器集群服務，對于微服務的部署，顯然 Docker Swarm 會更加適合，
swarm與k8s
Swarm和Kubernetes比較類似，但是更加輕，具有的功能也較kubernetes更少一些，
swarm的優勢
與獨立容器相比，swarm 服務的主要優勢之一是可以修改服務的配置，包括它所連接的網路和卷，而無需手動重新啟動服務，Docker 將更新配置，停止使用過期配置的服務任務，并創建與所需配置匹配的新任務，
swarm的基本結構
在以上結構圖可以看出Docker Client使用Swarm對集群(Cluster)進行調度使用，
swarm的關鍵點
1.Swarm
集群的管理和編排是使用嵌入docker引擎的SwarmKit，可以在docker初始化時啟動swarm模式或者加入已存在的swarm
2.Node
一個節點是docker引擎集群的一個實體，您還可以將其視為Docker節點，您可以在單個物理計算機或云服務器上運行一個或多個節點，但生產群集部署通常包括分布在多個物理和云計算機上的Docker節點，
要將應用程式部署到swarm，請將服務定義提交給Manager節點，Manager節點將Task的作業單元分派給worker node，
Manager節點還執行維護所需群集狀態所需的編排和集群管理功能，Manager節點選擇單個領導者來執行編排任務，
作業節點接收并執行從管理器節點分派的任務，默認情況下，Manager節點還將服務作為作業節點運行，但您可以將它們配置為僅運行管理器任務并且是僅管理器節點，代理程式在每個作業程式節點上運行，并報告分配給它的任務，Worker node向Manager節點通知其分配的任務的當前狀態，以便管理器可以維持每個作業者的期望狀態，
3.Service
一個服務是Task的定義，Manager或Work node上執行，它是群體系統的中心結構，是用戶與群體互動的主要根源，創建服務時，你需要指定要使用的容器鏡像，
4.Task
任務是在docekr容器中執行的命令，Manager節點根據指定數量的任務副本分配任務給worker節點
swarm的使用綱要
docker swarm：集群管理，子命令有init, join, leave, update，（docker swarm --help查看幫助）
docker service：服務創建，子命令有create, inspect, update, remove, tasks，（docker service--help查看幫助）
docker node：節點管理，子命令有accept, promote, demote, inspect, update, tasks, ls, rm，（docker node --help查看幫助）
node是加入到swarm集群中的一個docker引擎物體，可以在一臺物理機上運行多個node，node分為：
manager node --> 也就是管理節點
worker nodes --> 也就是作業節點
①manager node（管理節點）：執行集群的管理功能，維護集群的狀態，選舉一個leader節點去執行調度任務，
②worker node（作業節點）：接收和執行任務，參與容器集群負載調度，僅用于承載task，
③service（服務）：一個服務是作業節點上執行任務的定義，創建一個服務，指定了容器所使用的鏡像和容器運行的命令，service是運行在worker nodes上的task的描述，service的描述包括使用哪個docker 鏡像，以及在使用該鏡像的容器中執行什么命令，
④task（任務）：一個任務包含了一個容器及其運行的命令，task是service的執行物體，task啟動docker容器并在容器中執行任務，
swarm的使用
1.部署機器環境(四臺機器，CentOS8與Ubuntu系統)
IP：192.168.232.132 主機名：docker-manager-1 擔任角色：swarm manager
IP：192.168.232.133 主機名：docker-2 擔任角色：swarm node1
IP：192.168.232.134 主機名：docker-3 擔任角色：swarm node2
IP：192.168.232.131 主機(ubuntu)名：chaochao 擔任角色：swarm node3
2.配置hosts檔案
swarm manager：
[root@docker-manager-1 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.232.132 manager
192.168.232.133 worker1
192.168.232.134 worker2
192.168.232.131 worker3
[root@docker-manager-1 ~]# ^C另外三臺worker node操作一致
3.設定防火墻
關閉四臺機器上的防火墻，
如果是開啟防火墻，則需要在所有節點的防火墻上依次放行2377/tcp（管理埠）、7946/udp（節點間通信埠）、4789/udp（overlay 網路埠，容器之間）埠，
[root@docker-manager-1 ~]# systemctl disable firewalld
[root@docker-manager-1 ~]#[root@docker-2 ~]# systemctl disable firewalld
[root@docker-2 ~]#另外兩臺操作一致，
4.重啟docker服務，防止導致網路例外
[root@docker-manager-1 ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
[root@docker-manager-1 ~]#[root@docker-2 ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
[root@docker-2 ~]#[root@docker-3 ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
[root@docker-3 ~]#root@chaochao:~# service docker restart
root@chaochao:~#5.創建swarm集群
對于manager：
# 命令：docker swarm init --advertise-addr manager的IP地址
[root@docker-manager-1 ~]# docker swarm init --advertise-addr 192.168.232.132
Swarm initialized: current node (ooauma1x037wufqkh21uj0j7v) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-0200k3nv43fmc6hcuurx8z1iehsqq6uro12qjfeoxrkmk9fmom-1ub4wsmlpl4zhqalzdrgukx3l 192.168.232.132:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
[root@docker-manager-1 ~]#對于三臺swarm nodes
輸入manager創建的命令： docker swarm join --token ……,此命令在manager創建swarm時會自動生成，
[root@docker-2 ~]# docker swarm join --token SWMTKN-1-0200k3nv43fmc6hcuurx8z1iehsqq6uro12qjfeoxrkmk9fmom-1ub4wsmlpl4zhqalzdrgukx3l 192.168.232.132:2377
This node joined a swarm as a worker.
[root@docker-2 ~]#[root@docker-3 ~]# docker swarm join --token SWMTKN-1-0200k3nv43fmc6hcuurx8z1iehsqq6uro12qjfeoxrkmk9fmom-1ub4wsmlpl4zhqalzdrgukx3l 192.168.232.132:2377
This node joined a swarm as a worker.
[root@docker-3 ~]#root@chaochao:~# docker swarm join --token SWMTKN-1-0200k3nv43fmc6hcuurx8z1iehsqq6uro12qjfeoxrkmk9fmom-1ub4wsmlpl4zhqalzdrgukx3l 192.168.232.132:2377
This node joined a swarm as a worker.
root@chaochao:~#Tips：
退出swarm集群的命令：docker swarm leave
對于manager，解散集群需要加上--force：docker swarm leave --force
6.查看集群的相關資訊
[root@docker-manager-1 ~]# docker info
…….
Server:
Containers: 33
Running: 2
Paused: 0
Stopped: 31
Images: 61
Server Version: 20.10.8
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Native Overlay Diff: true
userxattr: false
……#上面的命令執行后 找到Swarm的關鍵字，就可以看到相關資訊了，swarm manager和swarm node都可以運行此命令
[root@docker-manager-1 ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
rge7nydl1tr8am0340zfxqggm chaochao Ready Active 20.10.8
svygquzhtveeenyd9y4i126tu docker-2 Ready Active 20.10.8
naer5j3rs5z4fea8cckcezpf3 docker-3 Ready Active 20.10.8
ooauma1x037wufqkh21uj0j7v * docker-manager-1 Ready Active Leader 20.10.8
[root@docker-manager-1 ~]##上面的命令是查看集群中的機器(注意上面node ID旁邊那個*號表示現在連接到這個節點上)，只有swarm manager可以運行此命令
7.在Swarm中部署服務
在docker-manager-1上運行docker service create --replicas 10 --name helloworld alpine ping docker.com
[root@docker-manager-1 ~]# docker service create --replicas 10 --name helloworld alpine ping docker.com
l65e19mrz1ywhu8sl3zim4bet
overall progress: 10 out of 10 tasks
1/10: running [==================================================>]
2/10: running [==================================================>]
3/10: running [==================================================>]
4/10: running [==================================================>]
5/10: running [==================================================>]
6/10: running [==================================================>]
7/10: running [==================================================>]
8/10: running [==================================================>]
9/10: running [==================================================>]
10/10: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#查看swarm服務：docker service ls
[root@docker-manager-1 ~]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
l65e19mrz1yw helloworld replicated 10/10 alpine:latest
[root@docker-manager-1 ~]#查看nginx容器運行情況（分配情況）
命令：docker ps
推薦：
manager上運行：docker service ps chao-web
[root@docker-manager-1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
fd4410c3a132 alpine:latest "ping docker.com" 2 minutes ago Up 2 minutes helloworld.1.svjs7kjfdicjf7ad0xhn850kx
33beffba02d8 alpine:latest "ping docker.com" 2 minutes ago Up 2 minutes helloworld.7.tepg67357odbvi99bz8n1s2z3
2cd834cab1d2 alpine:latest "ping docker.com" 2 minutes ago Up 2 minutes [root@docker-2 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
13c8d54bc217 alpine:latest "ping docker.com" 3 minutes ago Up 3 minutes helloworld.6.5emn8zu59a6gukvix2ilx7943
cd476a1148be alpine:latest "ping docker.com" 3 minutes ago Up 3 minutes helloworld.10.elvjakl7ir3p0g4b2994t797z[root@docker-3 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e5421b466442 alpine:latest "ping docker.com" 3 minutes ago Up 3 minutes helloworld.3.odr0kjnofzq11xf05jcernsca
9895ecb2e08a alpine:latest "ping docker.com" 3 minutes ago Up 3 minutes helloworld.4.gy7o9qb1mckhna10esuk6qlucroot@chaochao:~# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
83db926e26fc alpine:latest "ping docker.com" 4 minutes ago Up 3 minutes helloworld.5.wmqr3orrxyd9jl5n2qfm5rfxp
9648166b579d alpine:latest "ping docker.com" 4 minutes ago Up 3 minutes helloworld.8.q4kr2i2kz7qkjtqu5fav0cmy0
6cc0ad2cc251 alpine:latest "ping docker.com" 4 minutes ago Up 3 minutes helloworld.9.v1ctfiho9nojzps4ycdi8xemf
root@chaochao:~#添加、減少副本任務
增加命令1 docker service update --replicas 20 helloworld
[root@docker-manager-1 ~]# docker service update --replicas 20 helloworld
helloworld
overall progress: 20 out of 20 tasks
1/20: running [==================================================>]
2/20: running [==================================================>]
3/20: running [==================================================>]
4/20: running [==================================================>]
5/20: running [==================================================>]
6/20: running [==================================================>]
7/20: running [==================================================>]
8/20: running [==================================================>]
9/20: running [==================================================>]
10/20: running [==================================================>]
11/20: running [==================================================>]
12/20: running [==================================================>]
13/20: running [==================================================>]
14/20: running [==================================================>]
15/20: running [==================================================>]
16/20: running [==================================================>]
17/20: running [==================================================>]
18/20: running [==================================================>]
19/20: running [==================================================>]
20/20: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#增加和減少通用命令： docker service scale helloworld=5
[root@docker-manager-1 ~]# docker service scale helloworld=5
helloworld scaled to 5
overall progress: 5 out of 5 tasks
1/5: running [==================================================>]
2/5: running [==================================================>]
3/5: running [==================================================>]
4/5: running [==================================================>]
5/5: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#[root@docker-manager-1 ~]# docker service scale helloworld=15
helloworld scaled to 15
overall progress: 15 out of 15 tasks
1/15: running [==================================================>]
2/15: running [==================================================>]
3/15: running [==================================================>]
4/15: running [==================================================>]
5/15: running [==================================================>]
6/15: running [==================================================>]
7/15: running [==================================================>]
8/15: running [==================================================>]
9/15: running [==================================================>]
10/15: running [==================================================>]
11/15: running [==================================================>]
12/15: running [==================================================>]
13/15: running [==================================================>]
14/15: running [==================================================>]
15/15: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#swarm的其他命令
1.洗掉節點，命令：docker node rm --force 節點名"
2.更改節點的狀態
swarm集群中node的availability狀態可以為active或者drain：
active狀態下，node可以接受來自manager節點的任務分派
drain狀態下，node節點會結束task，且不再接受來自manager節點的任務分派（也就是節點離線）
命令： docker node update --availability 狀態 節點名
[root@docker-manager-1 ~]# docker node update --availability drain docker-3
# 將docker-3節點離線，# 再次修改為active狀態（將離線的節點再次上線）
[root@docker-manager-1 ~]# docker node update --availability active docker-3swarm集群部署web服務
1.創建服務
命令：docker service create --replicas 任務數量 --name 服務名 -p 8020:80（設定埠影響） nginx（鏡像名）
[root@docker-manager-1 ~]# docker service create --replicas 10 --name chao-web -p 8020:80 nginx
5h4b8hlq5mvkh1gkda71b7z8o
overall progress: 10 out of 10 tasks
1/10: running [==================================================>]
2/10: running [==================================================>]
3/10: running [==================================================>]
4/10: running [==================================================>]
5/10: running [==================================================>]
6/10: running [==================================================>]
7/10: running [==================================================>]
8/10: running [==================================================>]
9/10: running [==================================================>]
10/10: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#2.查看集群服務分配情況
命令：docker service ps chao-web
[root@docker-manager-1 ~]# docker service ps chao-web
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
wp1rdbn4ocyi chao-web.1 nginx:latest chaochao Running Running about a minute ago
v4s3ketvbjiy chao-web.2 nginx:latest docker-3 Running Running about a minute ago
3ep775a816g0 \_ chao-web.2 nginx:latest docker-3 Shutdown Rejected 2 minutes ago "No such image: nginx:latest@s…"
kpj8esqq3ee7 chao-web.3 nginx:latest docker-2 Running Running about a minute ago
nypfltoerv7h chao-web.4 nginx:latest chaochao Running Running about a minute ago
5qukcxy6tnl3 chao-web.5 nginx:latest docker-3 Running Running about a minute ago
xot5ioknnrsy chao-web.6 nginx:latest docker-manager-1 Running Running about a minute ago
iv6r6a6buz5n chao-web.7 nginx:latest docker-2 Running Running about a minute ago
xxc1lszt5y6k chao-web.8 nginx:latest docker-3 Running Running about a minute ago
5og6286rgl70 chao-web.9 nginx:latest docker-2 Running Running about a minute ago
xcw038hy4atr chao-web.10 nginx:latest docker-manager-1 Running Running about a minute ago
[root@docker-manager-1 ~]#3.查看創建的服務的詳細資訊
命令：docker service inspect chao-web
[root@docker-manager-1 ~]# docker service inspect chao-web
[
{
"ID": "5h4b8hlq5mvkh1gkda71b7z8o",
"Version": {
"Index": 209
},
"CreatedAt": "2021-08-23T02:16:28.984070915Z",
"UpdatedAt": "2021-08-23T02:16:28.986493133Z",
"Spec": {
"Name": "chao-web",
"Labels": {},
"TaskTemplate": {
"ContainerSpec": {
"Image": "nginx:latest@sha256:4d4d96ac750af48c6a551d757c1cbfc071692309b491b70b2b8976e102dd3fef",
"Init": false,
"StopGracePeriod": 10000000000,
"DNSConfig": {},
"Isolation": "default"
……..4.查看服務是否創建成功
訪問：https://localhost:埠號
思考：swarm manager 是通過什么方式和swarm node進行通信的？
2377 --> swarm manager
7946 --> swarm node
4789 --> swarm容器
manager通過埠來管理swarm節點在所有節點的防火墻上依次放行2377/tcp（管理埠）、7946/udp（節點間通信埠）、4789/udp（overlay 網路埠）埠，
[root@docker-manager-1 ~]# ss -anplut
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp UNCONN 0 0 0.0.0.0:4789 0.0.0.0:*
udp UNCONN 0 0 *:7946 *:* users:(("dockerd",pid=3290,fd=50))
tcp LISTEN 0 128 0.0.0.0:8000 0.0.0.0:* users:(("docker-proxy",pid=3504,fd=4))
tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=941,fd=4))
tcp LISTEN 0 128 [::]:8000 [::]:* users:(("docker-proxy",pid=3510,fd=4))
tcp LISTEN 0 128 *:2377 *:* users:(("dockerd",pid=3290,fd=43))
tcp LISTEN 0 128 *:7946 *:* users:(("dockerd",pid=3290,fd=48))
tcp LISTEN 0 128 *:8020 *:* users:(("dockerd",pid=3290,fd=67))
tcp LISTEN 0 128 [::]:22 [::]:* users:(("sshd",pid=941,fd=6))
[root@docker-manager-1 ~]#鏡像的滾動升級操作
滾動升級
先停一個舊的nginx容器，馬上啟動一個新版本的容器，
eg:nginx:1.19.10 ---> nginx:1.21.1
①先啟動一個舊版本nginx
[root@docker-manager-1 ~]# docker service create --replicas 10 --name chao-web -p 8021:80 nginx:1.19.10
7y02cykjtrfkea7x8djvj2u4v
overall progress: 10 out of 10 tasks
1/10: running [==================================================>]
2/10: running [==================================================>]
3/10: running [==================================================>]
4/10: running [==================================================>]
5/10: running [==================================================>]
6/10: running [==================================================>]
7/10: running [==================================================>]
8/10: running [==================================================>]
9/10: running [==================================================>]
10/10: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#②進行滾動升級
命令：docker service update --image nginx：latest chao-web（容器名）
[root@docker-manager-1 ~]# docker service update --image nginx:latest chao-web
image nginx:latest could not be accessed on a registry to record
its digest. Each node will access nginx:latest independently,
possibly leading to different nodes running different
versions of the image.
chao-web
overall progress: 10 out of 10 tasks
1/10: running [==================================================>]
2/10: running [==================================================>]
3/10: running [==================================================>]
4/10: running [==================================================>]
5/10: running [==================================================>]
6/10: running [==================================================>]
7/10: running [==================================================>]
8/10: running [==================================================>]
9/10: running [==================================================>]
10/10: running [==================================================>]
verify: Service converged
[root@docker-manager-1 ~]#結合compose和swarm進行多服務的編排
compose和swarm結合有什么優勢
優勢：compose和swarm結合可以實作優勢互補，通過compose可以對一臺服務器同時啟動多個容器，而swarm可以對多臺服務器進行管理，二者結合可以實作多臺服務器的多容器啟動，
代碼實體部署
1.創建swarm目錄
[root@docker-manager-1 ~]# mkdir /lianxi/swarm
[root@docker-manager-1 ~]# cd /lianxi/swarm/
[root@docker-manager-1 swarm]# ls
[root@docker-manager-1 swarm]#2.撰寫docker-compose.yml檔案，設定要啟動的容器的鏡像
[root@docker-manager-1 swarm]# vim docker-compose.yml
[root@docker-manager-1 swarm]# ls
docker-compose.yml
[root@docker-manager-1 swarm]# cat docker-compose.yml
version: "3"
services:
chao-nginx:
image: nginx
ports:
- 8023:80
deploy:
mode: replicated
replicas: 10
chao-redis:
image: redis
ports:
- 8024:6379
deploy:
mode: replicated
replicas: 6
[root@docker-manager-1 swarm]#3.通過這個yml檔案部署服務
命令：docker stack deploy -c docker-compose.yml deploy_deamon
[root@docker-manager-1 swarm]# docker stack deploy -c docker-compose.yml deploy_deamon
Creating network deploy_deamon_default
Creating service deploy_deamon_chao-redis
Creating service deploy_deamon_chao-nginx
[root@docker-manager-1 swarm]#4.查看創建的服務
[root@docker-manager-1 swarm]# docker stack ls
NAME SERVICES ORCHESTRATOR
deploy_deamon 2 Swarm
[root@docker-manager-1 swarm]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
7y02cykjtrfk chao-web replicated 10/10 nginx:latest *:8021->80/tcp
m2g64m8uhovj deploy_deamon_chao-nginx replicated 10/10 nginx:latest *:8023->80/tcp
3svlxmkhnubn deploy_deamon_chao-redis replicated 6/6 redis:latest *:8024->6379/tcp
[root@docker-manager-1 swarm]#Swarm中使用Volume
1.創建volume
[root@docker-manager-1 chaochao]# docker volume create chao-swarm
chao-swarm
[root@docker-manager-1 chaochao]# docker volume ls
DRIVER VOLUME NAME
local chao-nginx-volume-1
local chao-swarm
local chaochao
local dcdc1c404a7f25ccbbfaa29b941b2c95645e4bce5fbba73b455e842d46aac4fe
local fc4ee6067682c0cc7e19c9367c57e8822f460c49f845ad68768e6e94786c2c8e
local lizhichao
local my_wordpress_db_data
local my_wordpress_wordpress_data
[root@docker-manager-1 chaochao]# cd /var/lib/docker/volumes/chao-swarm/_data
[root@docker-manager-1 _data]# cp /web/* .
cp：是否覆寫'./1.jpg'？ y
cp：是否覆寫'./index.html'？ y
cp：是否覆寫'./rep.html'？ y
[root@docker-manager-1 _data]# ls
1.jpg 50x.html index.html rep.html2.創建新的服務并掛載volume(nginx為例)
命令：docker service create --replicas 10 --mount type=volume,src=chao-swarm,dst=/usr/share/nginx/html --name chao-swarm-volume -p 8025:80 nginx
[root@docker-manager-1 _data]# docker service create --replicas 10 --mount type=volume,src=chao-swarm,dst=/usr/share/nginx/html --name chao-swarm-volume -p 8025:80 nginx
image nginx:latest could not be accessed on a registry to record
its digest. Each node will access nginx:latest independently,
possibly leading to different nodes running different
versions of the image.
kaxx41zrrwv72d5c2fqokpr6h
overall progress: 10 out of 10 tasks
1/10: running [==================================================>]
2/10: running [==================================================>]
3/10: running [==================================================>]
4/10: running [==================================================>]
5/10: running [==================================================>]
6/10: running [==================================================>]
7/10: running [==================================================>]
8/10: running [==================================================>]
9/10: running [==================================================>]
10/10: running [==================================================>]
verify: Service converged
[root@docker-manager-1 _data]# docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
kaxx41zrrwv7 chao-swarm-volume replicated 10/10 nginx:latest *:8025->80/tcp
7y02cykjtrfk chao-web replicated 10/10 nginx:latest *:8021->80/tcp
m2g64m8uhovj deploy_deamon_chao-nginx replicated 10/10 nginx:latest *:8023->80/tcp
3svlxmkhnubn deploy_deamon_chao-redis replicated 6/6 redis:latest *:8024->6379/tcp
[root@docker-manager-1 _data]# docker service ps chao-swarm-volume
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
jl8zorwqpwu1 chao-swarm-volume.1 nginx:latest docker-3 Running Running 32 seconds ago
qpkhrrcyeacx chao-swarm-volume.2 nginx:latest chaochao Running Running 35 seconds ago
jdmmuem72q57 chao-swarm-volume.3 nginx:latest docker-3 Running Running 33 seconds ago
rv2zplpvz82v chao-swarm-volume.4 nginx:latest docker-manager-1 Running Running 34 seconds ago
0l4switts1y8 chao-swarm-volume.5 nginx:latest chaochao Running Running 35 seconds ago
ru5thcx6afxw chao-swarm-volume.6 nginx:latest docker-manager-1 Running Running 34 seconds ago
aq2v3e4iv470 chao-swarm-volume.7 nginx:latest docker-2 Running Running 35 seconds ago
rst6zeszjs9p chao-swarm-volume.8 nginx:latest docker-2 Running Running 33 seconds ago
qtr7et4tkimr chao-swarm-volume.9 nginx:latest chaochao Running Running 36 seconds ago
z4a3uu3elgey chao-swarm-volume.10 nginx:latest docker-2 Running Running 33 seconds ago
[root@docker-manager-1 _data]#3.查看nginx服務
問題：如何解決web服務的網頁保持一致？
通過NFS服務和volume來解決，下期講解！
創作不易，客官點個贊，評論一下吧！超超和你一起加油?😜
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