env注入cm环境变量及字段引用实战

需求，我们在 环境变量中 env 中需要引用 configMap 里边的一些值怎么办？

1-我们先来创建一个 configMap-env的 cm

[root@master231 /manifests/pod/cm/cm-env]#cat cm-env.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-env
data:
  school: baimei
class: linux86
student.txt: |
崔晨阳
邓祥丞
赵志勇
相关命令
kubectl get cm nginx-conf
kubectl describe cm cm-env

2- 在 env中引用 configmap

[root@master231 /manifests/pod/cm/cm-env]#cat 19-pods-volumes-configMaps-env.yaml
apiVersion: v1
kind: Pod
metadata:
name: baimei-games-cm-env-003
spec:
nodeName: worker233
containers:

name: games
image: harbor.baimei.com/baimei-games/games:v0.5
resources:
requests:
cpu: "500m"
memory: "200M"
limits:
cpu: 1.5
memory: "400M"
env:

name: baimei_LINUX86_SHAHE_JIAOSHI02_CLASS
valueFrom:
configMapKeyRef:
name: cm-env
key: class
name: baimei_LINUX86_SHAHE_JIAOSHI03_school
valueFrom:
configMapKeyRef:
name: cm-env
key: school
name: baimei_linux86_shahe_jiaoshi03_student
valueFrom:
configMapKeyRef:
name: cm-env
key: student.txt
name: baimei_linux86_shahe_jiaoshi03_INFO_POD_NAME
valueFrom:
fieldRef:
fieldPath: "metadata.name"
name: baimei_linux86_shahe_jiaoshi03_INFO_POD_NODENAME
valueFrom:
fieldRef:
fieldPath: "spec.nodeName"
name: baimei_linux86_shahe_jiaoshi03_INFO_POD_IP
valueFrom:
fieldRef:
fieldPath: "status.podIP"
name: baimei_linux86_shahe_jiaoshi03_INFO_RESOURCE_CPU
valueFrom:
resourceFieldRef:
resource: "limits.cpu"
name: baimei_linux86_shahe_jiaoshi03_INFO_RESOURCE_MEMORY
valueFrom:
resourceFieldRef:
resource: "requests.memory"

运行一下：

kubectl apply  -f 19-pods-volumes-configMaps-env.yaml

查看 pods 运行状态：

kubectl  get pods -o wide

查看 引用 confing 是否成功

kubectl exec -it baimei-games-cm-env-003  -- env

更多的 帮助信息：

kubectl explain po.spec.containers.env.valueFrom