实战交付一套dubbo微服务到k8s集群(8)之configmap使用

使用ConfigMap管理应用配置

拆分环境

主机名	角色	IP地址
mfyxw10.mfyxw.com	zk1.od.com(Test环境)	192.168.80.10
mfyxw20.mfyxw.com	zk2.od.com(Prod环境)	192.168.80.20
mfyxw30.mfyxw.com	无，暂时停用此zookeepre	192.168.80.30

1.将原来运行的zookeeper停止并且将配置文件修改

分别在mfyxw10、mfyxw20、mfyxw30主机上执行

[root@mfyxw10 ~]# /opt/zookeeper/bin/zkServer.sh stop    #以mfyxw10为例，其它二台类似
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED

将/data/zookeeper/data和/data/zookeeper/logs所有文件和目录都清空（以mfyxw10为例，其它二台类似）

[root@mfyxw10 ~]# rm -fr /data/zookeeper/data/*
[root@mfyxw10 ~]# rm -fr /data/zookeeper/logs/*

分别在mfyxw10和mfyxw20主机下执行，修改zookeeper配置文件(以mfyxw10为例)

[root@mfyxw10 ~]# cat > /opt/zookeeper/conf/zoo.cfg << EOF
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/data/zookeeper/data
dataLogDir=/data/zookeeper/logs
clientPort=2181
EOF

分别在mfyxw10和mfyxw20主机下执行(以mfyxw10为例)，启动zookeeper

[root@mfyxw10 ~]# /opt/zookeeper/bin/zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@mfyxw10 ~]# 
[root@mfyxw10 ~]# /opt/zookeeper/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: standalone
[root@mfyxw10 ~]# 

2.将dubbo-monitor的pod删除

在master节点(mfyxw30或mfyxw40)上任意一台执行即可

[root@mfyxw30 ~]# kubectl delete -f http://k8s-yaml.od.com/dubbo-monitor/Deployment.yaml
deployment.extensions "dubbo-monitor" deleted

在运维主机(mfyxw50)上重新为dubbo-monitor提供Deployment和configMap的配置资源清单

Deployment.yaml文件内容如下：

[root@mfyxw50 ~]# cat > /data/k8s-yaml/dubbo-monitor/dp.yaml << EOF
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: dubbo-monitor
  namespace: infra
  labels: 
    name: dubbo-monitor
spec:
  replicas: 1
  selector:
    matchLabels: 
      name: dubbo-monitor
  template:
    metadata:
      labels: 
        app: dubbo-monitor
        name: dubbo-monitor
    spec:
      containers:
      - name: dubbo-monitor
        image: harbor.od.com/infra/dubbo-monitor:latest
        ports:
        - containerPort: 8080
          protocol: TCP
        - containerPort: 20880
          protocol: TCP
        imagePullPolicy: IfNotPresent
        volumeMounts:
          - name: configmap-volume
            mountPath: /dubbo-monitor-simple/conf
      volumes:
        - name: configmap-volume
          configMap:
            name: dubbo-monitor-cm
      imagePullSecrets:
      - name: harbor
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      securityContext: 
        runAsUser: 0
      schedulerName: default-scheduler
  strategy:
    type: RollingUpdate
    rollingUpdate: 
      maxUnavailable: 1
      maxSurge: 1
  revisionHistoryLimit: 7
  progressDeadlineSeconds: 600
EOF

configMap.yaml文件内容如下：

[root@mfyxw50 ~]# cat > /data/k8s-yaml/dubbo-monitor/configmap.yaml << EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: dubbo-monitor-cm
  namespace: infra
data:
  dubbo.properties: |
    dubbo.container=log4j,spring,registry,jetty
    dubbo.application.name=simple-monitor
    dubbo.application.owner=Maple
    dubbo.registry.address=zookeeper://zk1.od.com:2181
    dubbo.protocol.port=20880
    dubbo.jetty.port=8080
    dubbo.jetty.directory=/dubbo-monitor-simple/monitor
    dubbo.charts.directory=/dubbo-monitor-simple/charts
    dubbo.statistics.directory=/dubbo-monitor-simple/statistics
    dubbo.log4j.file=/dubbo-monitor-simple/logs/dubbo-monitor.log
    dubbo.log4j.level=WARN
EOF

3.应用dubbo-monitor资源配置清单

在master节点(mfyxw30或mfyxw40)上任意一台执行即可

[root@mfyxw30 ~]# kubectl apply -f http://k8s-yaml.od.com/dubbo-monitor/configmap.yaml
configmap/dubbo-monitor-cm created
[root@mfyxw30 ~]# 
[root@mfyxw30 ~]# kubectl apply -f http://k8s-yaml.od.com/dubbo-monitor/dp.yaml
deployment.extensions/dubbo-monitor created
[root@mfyxw30 ~]# kubectl get pod -n infra
NAME                             READY   STATUS    RESTARTS   AGE
dubbo-monitor-6676dd74cc-rd86g   1/1     Running   0          55s
jenkins-b99776c69-p6skp          1/1     Running   10         22d

4.将duboo-monitor的pod扩容到2份

在master节点(mfyxw30或mfyxw40)上任意一台执行即可

[root@mfyxw30 ~]# kubectl scale --replicas=2 -f http://k8s-yaml.od.com/dubbo-monitor/dp.yaml
deployment.extensions/dubbo-monitor scaled
[root@mfyxw30 ~]# 
[root@mfyxw30 ~]# kubectl get pod -n infra
NAME                             READY   STATUS              RESTARTS   AGE
dubbo-monitor-6676dd74cc-9hghb   0/1     ContainerCreating   0          4s
dubbo-monitor-6676dd74cc-rd86g   1/1     Running             0          15m
jenkins-b99776c69-p6skp          1/1     Running             10         22d
[root@mfyxw30 ~]# kubectl get pod -n infra
NAME                             READY   STATUS    RESTARTS   AGE
dubbo-monitor-6676dd74cc-9hghb   1/1     Running   0          8s
dubbo-monitor-6676dd74cc-rd86g   1/1     Running   0          15m
jenkins-b99776c69-p6skp          1/1     Running   10         22d

5.查看dubbo-monitor

启用了二份dubbo-monitor，在浏览器访问dubbo-monitor，不停刷新能看得到会在二个POD中切换