Kubernetes之自定义hosts

官方文档
https://kubernetes.io/zh/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: tomcat-test-sy
  namespace: test
  labels:
    app: tomcat-test-sy
spec:
  selector:
    matchLabels:
      app: tomcat-test-sy
  revisionHistoryLimit: 5
  replicas: 1
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  template:
    metadata:
      labels:
        app: tomcat-test-sy 
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - tomcat-test-sy
            topologyKey: kubernetes.io/hostname
      terminationGracePeriodSeconds: 60
      nodeSelector:
        apptype: memnode
      hostAliases:                   #配置hosts文件
      - ip: "192.168.10.10"            #配置解析的IP
        hostnames:
        - "www.baidu.com"            #配置域名
      containers:
      - name: tomcat-test-sy
        image: docker-mirror.siku.cn/test/tomcat-test-sy:20200409
        securityContext:
         privileged: true
        imagePullPolicy: Always
        env:
        - name: JAVA_OPTS
          value: "-Xmx2688M -Xms2688M -Xmn960M -XX:MaxMetaspaceSize=512M -XX:MetaspaceSize=512M -XX:+UseConcMarkSweepGC -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 -XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses -XX:+CMSClassUnloadingEnabled -XX:+ParallelRefProcEnabled -XX:+CMSScavengeBeforeRemark -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/data/dump-logs/tomcat-test-sy/dump.log -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -Xloggc:/data/dump-logs/tomcat-test-sy/heap_trace.log -Dnetworkaddress.cache.ttl=30 -Dsun.net.inetaddr.ttl=30"
        - name: HOST_IP
          valueFrom:
              fieldRef:
                fieldPath: status.hostIP
        resources:
          limits:
            cpu: "2"
            memory: "4096M"
          requests:
            cpu: "1"
            memory: "4096M"

[rsync@tomcat-test]$ kubectl get pods  -n test -l app=tomcat-test-sy
NAME                            READY   STATUS    RESTARTS   AGE
tomcat-test-sy-fdb5466d-mps2d   1/1     Running   0          88s
[rsync@tomcat-test]$ kubectl exec -it tomcat-test-sy-fdb5466d-mps2d bash -n test
[root@tomcat-test-sy-fdb5466d-mps2d /]# cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
fe00::0 ip6-mcastprefix
fe00::1 ip6-allnodes
fe00::2 ip6-allrouters
10.49.7.251     tomcat-test-sy-fdb5466d-mps2d

# Entries added by HostAliases.
192.168.10.10   www.baidu.com