k8s 的configmap与Secret

命令行指定方式创建

[root@master vml]# kubectl create configmap nginx --from-literal=nginx_port=80 --from-literal=server_name=www.chenxi.com 
configmap/nginx created

　　查看

[root@master vml]# kubectl get configmap
NAME        DATA   AGE
nginx       2      15s
ui-config   1      37d
[root@master vml]# kubectl  describe configmap nginx
Name:         nginx
Namespace:    default
Labels:       
Annotations:  

Data
====
nginx_port:
----
80
server_name:
----
www.chenxi.com
Events:  

　　命令行已指定文件方式创建

[root@master vml]# kubectl create configmap www.nginx.conf --from-file=./www.conf 
configmap/www.nginx.conf created

　　查看

[root@master vml]# kubectl get configmap
NAME             DATA   AGE
nginx            2      35m
ui-config        1      37d
www.nginx.conf   1      2m14s

　　编写pod文件：这个方式不能实时更新 

[root@master vml]# cat pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: pod-demo
  namespace: default
  labels:
    app: myapp
    tier: frontend
spec:
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    ports:
    - name: http
      containerPort: 80
    - name: https 
      containerPort: 443
    env:
    - name: NGINX
      valueFrom:
        configMapKeyRef:
          name:  nginx  
          key: nginx_port
          optional: 

　　启动

[root@master vml]# kubectl apply -f pod.yaml 
pod/pod-demo created
[root@master vml]# kubectl exec -it pod-demo -- /bin/sh
/ # echo $NGINX
80
/ # exit

　　与存储卷的方式挂载

[root@master vml]# cat pod.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: pod-demo
  namespace: default
  labels:
    app: myapp
    tier: frontend
spec:
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    ports:
    - name: http
      containerPort: 80
    - name: https 
      containerPort: 443
    volumeMounts:
    - name: nginx
      mountPath: /chenxi
      readOnly: true
  volumes: 
  - name: nginx
    configMap: 
      name: www.nginx.conf
[root@master vml]# kubectl exec -it pod-demo -- /bin/sh
/ # ls /chenxi
www.conf
/ # ls /chenxi/www.conf
/chenxi/www.conf
/ # cat /chenxi/www.conf
server {
  server_name www.chenxi.com;
  listen 80;
  root /data/www/html;
}

　　使用edit在线修改configMap内容

[root@master vml]# kubectl edit configMap www.nginx.conf

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
  www.conf: |+
    server {
      server_name www.chenxi.com;
      listen 9090;
      root /data/www/html;
    }

kind: ConfigMap
metadata:
  creationTimestamp: "2020-04-27T02:58:24Z"
  name: www.nginx.conf
  namespace: default
  resourceVersion: "8747971"
  selfLink: /api/v1/namespaces/default/configmaps/www.nginx.conf
  uid: 5a958a9e-31f6-453c-9379-42bde7a21200
configmap/www.nginx.conf edited  ---表示修改成功
[root@master vml]# kubectl exec -it pod-demo -- /bin/sh
/ # cat /chenxi/www.conf  会有一定延迟
server {
  server_name www.chenxi.com;
  listen 80;
  root /data/www/html;
}

/ # cat /chenxi/www.conf 再次查看
server {
  server_name www.chenxi.com;
  listen 9090;  修改成功
  root /data/www/html;
}

　　如果存在多个文件如何只挂在一个文件

[root@master vml]# kubectl explain pods.spec.volumes.configMap.
KIND:     Pod
VERSION:  v1

RESOURCE: configMap