在容器内获取Pod的信息

每个Pod被创建出来之后，都会被系统分配唯一的名字、IP地址，并且处于某个Namespace中，而使用Downward API就能在Pod的容器内获取Pod的这些重要信息。

apiVersion: v1
kind: Pod
metadata:
  name: dapi-get-info
spec:
  containers:
  - name: test-get-info
    image: registry.cn-hangzhou.aliyuncs.com/google_containers/busybox
    command: ['/bin/sh','-c','env']
    env:
      - name: MY_NODE_NAME
        valueFrom:
          fieldRef:
            fieldPath: spec.nodeName
      - name: MY_POD_NAME
        valueFrom:
          fieldRef:
            fieldPath: metadata.name
      - name: MY_POD_IP
        valueFrom:
          fieldRef:
            fieldPath: status.podIP

​

查看env信息

KUBERNETES_PORT=tcp://10.96.0.1:443
KUBERNETES_SERVICE_PORT=443
HOSTNAME=dapi-get-info
SHLVL=1
MYWEB_SERVICE_HOST=10.111.193.215
MYWEB_PORT_8080_TCP_ADDR=10.111.193.215
HOME=/root
MYWEB_PORT_8080_TCP_PORT=8080
MYWEB_PORT_8080_TCP_PROTO=tcp
MYWEB_PORT=tcp://10.111.193.215:8080
MYWEB_SERVICE_PORT=8080
MYWEB_PORT_8080_TCP=tcp://10.111.193.215:8080
MY_POD_IP=10.38.0.5
MYSQL_PORT_3306_TCP_ADDR=10.109.55.96
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
KUBERNETES_PORT_443_TCP_PORT=443
MYSQL_PORT_3306_TCP_PORT=3306
KUBERNETES_PORT_443_TCP_PROTO=tcp
MYSQL_SERVICE_HOST=10.109.55.96
MYSQL_PORT_3306_TCP_PROTO=tcp
MY_NODE_NAME=node1
MYSQL_SERVICE_PORT=3306
MYSQL_PORT=tcp://10.109.55.96:3306
MYSQL_PORT_3306_TCP=tcp://10.109.55.96:3306
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
PWD=/
KUBERNETES_SERVICE_HOST=10.96.0.1
MY_POD_NAME=dapi-get-info