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 yamlapiVersion: v1data:aa: "1"bb: "2"kind: ConfigMapmetadata:creationTimestamp: 2017-06-21T09:36:26Zname: test-conf003namespace: defaultresourceVersion: "2465633"selfLink: /api/v1/namespaces/default/configmaps/test-conf003uid: 1900baf0-5665-11e7-901f-6c92bf2e6e88

3. 通过yaml文件创建pod，yaml文件

   apiVersion: v1kind: Podmetadata:name: testpod001spec: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:  bbvolumes:   - 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=2SPECIAL_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 0drwxrwxrwx 3 root root 143 Jun 22 02:14 configlrwxrwxrwx 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]# lltotal 0lrwxrwxrwx 1 root root 14 Jun 22 02:14 test.sh -> ..data/test.shlrwxrwxrwx 1 root root 12 Jun 22 02:14 test1 -> ..data/test1lrwxrwxrwx 1 root root 12 Jun 22 02:14 test2 -> ..data/test2lrwxrwxrwx 1 root root 15 Jun 22 02:14 test2.sh -> ..data/test2.shlrwxrwxrwx 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。