k8s系列(3)-StatefulSet的MongoDB实战

 Registry Mirrors:
  https://dockerhub.woa.com/

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongodb
spec:
  replicas: 3
  serviceName: mongodb
  selector:
    matchLabels:
      app: mongodb
  template:
    metadata:
      labels:
        app: mongodb
    spec:
      containers:
        - name: mongo
          image: mongo:4.4
          # IfNotPresent 仅本地没有镜像时才远程拉，Always 永远都是从远程拉，Never 永远只用本地镜像，本地没有则报错
          imagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:
  name: mongodb
spec:
  selector:
    app: mongodb
  type: ClusterIP
  # HeadLess
  clusterIP: None
  ports:
    - port: 27017
      targetPort: 27017

kubectl get endpoints mongodb -o yaml
kubectl run mongodb-client --rm --tty -i --restart='Never' --image [docker.io/bitnami/mongodb:4.4.10-debian-10-r20](http://docker.io/bitnami/mongodb:4.4.10-debian-10-r20) --command — bash
mongo --host mongodb-0.mongodb
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
> use test
switched to db test
> db.users.save({'_id':'easydoc','name':'易文档'})
WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : "easydoc" })
> db.users.find()
{ "_id" : "easydoc", "name" : "易文档” }
> exit
I have no name!@mongodb-client:/$ mongo --host mongodb-1.mongodb
> show databases;
admin   0.000GB
config  0.000GB
local   0.000GB
> db.users.find()
> use test
switched to db test
> db.users.save({'_id':'machine','name':'mondb-1机器'})
WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : "machine" })
> db.users.find()
{ "_id" : "machine", "name" : "mondb-1机器" }
> exit
I have no name!@mongodb-client:/$ mongo --host mongodb-2.mongodb
> use test
switched to db test
> db.users.save({'_id':'tools','name':'工具箱'})
WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : "tools" })
> db.users.find()
{ "_id" : "tools", "name" : "工具箱" }
> exit
bye

kubectl port-forward service/mongo 28015:27017

以上所有命令都有效。输出类似于：
Forwarding from 127.0.0.1:28015 -> 27017
Forwarding from [::1]:28015 -> 27017