我正在使用 minikube 和 VirtualBox 在 Kubernetes 中運行集群。
這是我的無頭服務
apiVersion: v1
kind: Service
metadata:
labels:
service: test
name: test-group-ping
spec:
clusterIP: None
ports:
- port: 4444
name: ping
protocol: TCP
targetPort: 4444
selector:
service: test
sessionAffinity: None
type: ClusterIP
這就是我部署 pod 的方式
apiVersion: apps/v1
kind: Deployment
metadata:
name: test
labels:
app: test
spec:
replicas: 3
selector:
matchLabels:
app: test
template:
metadata:
labels:
app: test
spec:
containers:
- name: test
image: image
env:
- name: KC_PROXY
value: "edge"
- name: PROXY_ADDRESS_FORWARDING
value: "true"
ports:
- containerPort: 8080
- containerPort: 4444
- containerPort: 8888
readinessProbe:
httpGet:
path: "/test"
port: 8080
initialDelaySeconds: 600
periodSeconds: 30
我有另一個用于 Pod 的負載均衡器
當我使用kubectl get services時，我得到test-group-ping一個無頭服務
test-group-ping ClusterIP None <none> 4444/TCP 8h
kubectl describe service test-group-ping
Name: test-group-ping
Namespace: default
Labels: service=test
Annotations: <none>
Selector: service=test
Type: ClusterIP
IP Family Policy: SingleStack
IP Families: IPv4
IP: None
IPs: None
Port: ping 4444/TCP
TargetPort: 4444/TCP
Endpoints: <none>
Session Affinity: None
Events: <none>
我需要這個無頭服務的 DNS 查詢
我試過 test-group-ping.default.svc.cluster.local了，但是當我嘗試對此進行 DNS 查找時，它不會回傳 pod 的任何 IP 地址
% dig search test-group-ping.default.svc.cluster.local
; <<>> DiG 9.10.6 <<>> search test-group-ping.default.svc.cluster.local
;; global options: cmd
;; Got answer:
;; WARNING: .local is reserved for Multicast DNS
;; You are currently testing what happens when an mDNS query is leaked to DNS
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 8544
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;test-group-ping.default.svc.cluster.local. IN A
;; AUTHORITY SECTION:
. 10800 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2022032100 1800 900 604800 86400
;; Query time: 140 msec
;; SERVER: 2600:1702:8c0:e100::1#53(2600:1702:8c0:e100::1)
;; WHEN: Mon Mar 21 10:33:50 CDT 2022
;; MSG SIZE rcvd: 151
;; Query time: 140 msec
;; SERVER: 2600:1702:8c0:e100::1#53(2600:1702:8c0:e100::1)
;; WHEN: Mon Mar 21 10:33:50 CDT 2022
;; MSG SIZE rcvd: 151
uj5u.com熱心網友回復：
您的服務選擇器service: test與 Pod 標簽不匹配app: test。
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