k8s-configmap 在pod中使用

使用包含： 环境变量、文件和目录。

1. 命令行字面量创建
   
kubectl create configmap test-conf003 --from-literal=aa=1 --from-literal=bb=2


2. 查看创建的configmap，yaml文件展示

   [root@controller01 confmap]# kubectl get configmap test-conf003 -o yaml
   apiVersion: v1
   data:
   aa: "1"
   bb: "2"
   kind: ConfigMap
   metadata:
   creationTimestamp: 2017-06-21T09:36:26Z
   name: test-conf003
   namespace: default
   resourceVersion: "2465633"
   selfLink: /api/v1/namespaces/default/configmaps/test-conf003
   uid: 1900baf0-5665-11e7-901f-6c92bf2e6e88

3. 通过yaml文件创建pod，yaml文件

   apiVersion: v1
   kind: Pod
   metadata:
   name: testpod001
   spec:
   containers:
      - name: testcontainer
        image: 10.21.1.151/quicksilver/deploy_openresty:1.2
        volumeMounts:
          - name: testvolume
            mountPath: /tmp/config
          - name: nginx-config-volume
            mountPath: /tmp/
        command: ["/bin/sh", "-c", "/usr/local/openresty/nginx/sbin/nginx -c /tmp/nginx.conf"]
        env:
           - name: SPECIAL_KEY1
             valueFrom:
                 configMapKeyRef:
                     name: test-conf003 
                     key:  aa
           - name: SPECIAL_KEY2
             valueFrom:
                 configMapKeyRef:
                     name: test-conf003 
                     key:  bb
   volumes:
      - name: testvolume
        configMap:
           name: testconf004
      - name: nginx-config-volume
        configMap:
           name: nginx-conf
           items:
               - key: nginx.conf
                 path: nginx.conf

4. exec进入pod

   [root@controller01 confmap]# kubectl exec -it testpod001  /bin/bash

5. 查看pod从configmap中导入的环境变量

   [root@testpod001 /]# env | grep SPEC*
   SPECIAL_KEY2=2
   SPECIAL_KEY1=1

   这时我们看到configmap中的data数据已经导入到pod中的环境变量了。

6. 查看文件的挂载

   [root@testpod001 /]# ll /tmp/
   total 0
   drwxrwxrwx 3 root root 143 Jun 22 02:14 config
   lrwxrwxrwx 1 root root  17 Jun 22 02:14 nginx.conf -> ..data/nginx.conf

   我们可以看到该文件夹下面总的文件数为0，config和nginx.conf都是挂载进来的，文件都是软连接

7. 查看挂载目录中的文件

   [root@testpod001 config]# ll
   total 0
   lrwxrwxrwx 1 root root 14 Jun 22 02:14 test.sh -> ..data/test.sh
   lrwxrwxrwx 1 root root 12 Jun 22 02:14 test1 -> ..data/test1
   lrwxrwxrwx 1 root root 12 Jun 22 02:14 test2 -> ..data/test2
   lrwxrwxrwx 1 root root 15 Jun 22 02:14 test2.sh -> ..data/test2.sh
   lrwxrwxrwx 1 root root 26 Jun 22 02:14 test_configmap.yaml -> ..data/test_configmap.yaml

8. 验证同挂载目录中的文件相互调用关系正确
   
[root@testpod001 config]# cat test.sh
#!/bin/bash
cat ./test1
[root@testpod001 config]# cat test1
key=123
[root@testpod001 config]# /bin/bash test.sh
key=123

   这个例子的使用就是nginx，nginx.conf中需要调用当前目录的mine.type文件。