一、简介

ConfigMap是一个配置中心，可以配置Pod

二、ConfigMap

常见创建ConfigMap的类型如下：

• 命令创建
• 文件创建

1.命令行创建ConfigMap

# --from-literal 表示指定不同的key、value
[root@redis-cluser-01 configmap]# kubectl create configmap my-config --from-literal=key1=config1 --from-literal=key2=config2

# 查看cm
[root@redis-cluser-01 configmap]# kubectl get cm
NAME           DATA   AGE
my-config      2      62s

# 查看cm的具体值信息，可以看到键key1=config1 key2=config2
[root@redis-cluser-01 configmap]# kubectl describe cm my-config
Name:         my-config
Namespace:    default
Labels:       
Annotations:  

Data
====
key1:
----
config1
key2:
----
config2
Events:  

2.文件创建ConfigMap

[root@redis-cluser-01 configmap]# vim www.conf
servcer {
    server_name myaqpp.magedu.com;
    listen 80;
    root /data/web/html/;
}

[root@redis-cluser-01 configmap]# kubectl create configmap nginx-www --from-file=./www.conf

# 查看cm
[root@redis-cluser-01 configmap]# kubectl get cm
NAME        DATA   AGE
nginx-www   1      26s

# 查看cm的具体值信息 可以看到键www.conf value值则为其文件内容
[root@redis-cluser-01 configmap]# kubectl describe cm nginx-www
Name:         nginx-www
Namespace:    default
Labels:       
Annotations:  

Data
====
www.conf:
----
servcer {
    server_name myaqpp.magedu.com;
    listen 80;
    root /data/web/html/;
}

Events:  

三、ConfigMap配置至pod

配置了configmap后，因其本身就是一个配置中心，可以挂载至容器中让其更变为环境变量

1.envFrom配置环境变量

• 将cm中的key挂载至容器中

  “`shell

  创建cm

  [root@redis-cluser-01 tmp]# kubectl create configmap config-test –from-literal=my_key=my_value

  查看cm信息

  [root@redis-cluser-01 tmp]# kubectl describe cm config-test
  Name: config-test
  Namespace: default
  Labels:
  Annotations:

  Data

  my_key:

---

my_value
Events:

[root@redis-cluser-01 configmap]# vim pod-configmap.yml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
– name: test-container
image: ikubernetes/myapp:v1
envFrom:
– configMapRef:
name: config-test
restartPolicy: Never

# 查看容器的环境变量
[root@redis-cluser-01 configmap]# kubectl exec -it dapi-test-pod printenv
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=dapi-test-pod
TERM=xterm
my_key=my_value //环境变量已经加载进来
KUBERNETES_SERVICE_PORT_HTTPS=443

# 备注：此种方法比较宽泛，它统一将key value全部作为环境变量

“`

2.env配置环境变量

• env配置环境变量可以细化某个cm的key，也可以同时指定多个cm的key

[root@redis-cluser-01 configmap]# vim configmap-pod-2.yml
apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod-2
spec:
  containers:
    - name: test-container
      image: ikubernetes/myapp:v1
      env:
        - name: KEY1
          valueFrom:
            configMapKeyRef:
              name: my-config
              key: key1
        - name: MY_KEY
          valueFrom:
            configMapKeyRef:
              name: config-test
              key: my_key
  restartPolicy: Never

# 查看容器环境变量
[root@redis-cluser-01 configmap]# kubectl exec -it dapi-test-pod-2 printenv
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=dapi-test-pod-2
TERM=xterm
KEY1=config1
MY_KEY=my_value
....

四、ConfigMap语法

• 创建configmap

[root@redis-cluser-01 configmap]# vim configmap-1.yml
apiVersion: v1
kind: ConfigMap
metadata:
  name: special-config
  namespace: default
data:
  SPECIAL_LEVEL: very
  SPECIAL_TYPE: charm

# 查看cm 
root@redis-cluser-01 configmap]# kubectl describe cm special-config
Name:         special-config
Namespace:    default
Labels:       
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"v1","data":{"SPECIAL_LEVEL":"very","SPECIAL_TYPE":"charm"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"special-...

Data
====
SPECIAL_LEVEL:
----
very
SPECIAL_TYPE:
----
charm
Events:  

• pod加载configmap

  参考第三步骤