一、单文件挂载到空目录

实例演示要求：

1. 基于nginx.conf配置文件创建一个ConfigMap配置
2. 把该ConfigMap配置，挂载到/etc/application目录

1、nginx.conf配置文件如下：

[root@k8s-master cm]# cat nginx.conf 

user  nginx;
worker_processes  4;     #修改了这个位置

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
    worker_connections  2048;     #修改了这个位置
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;
}

2、基于该nginx.conf文件创建的ConfigMap

[root@k8s-master cm]# kubectl create cm nginx-conf --from-file=nginx.conf 
configmap/nginx-conf created

3、创建相应的deployment，并挂载该ConfigMap

apiVersion: apps/v1
kind: Deployment
metadata:
  name: demo
  namespace: default
spec:
  selector:
    matchLabels:
      app: demo
  template:
    metadata:
      labels:
        app: demo
    spec:
      volumes:
      - configMap:
          name: nginx-conf          #指定使用ConfigMap的名称
        name: config                   #volumes的名称
      containers:
      - name: nginx
        image: nginx:alpine
        imagePullPolicy: IfNotPresent
        volumeMounts:
        - mountPath: "/etc/application"   #容器挂载的目录（空的）
          name: config                              #指定上面的volumes名称

4、我们尝试将ConfigMap为nginx-conf配置挂载到/etc/profile.d/非空目录的情况

修改挂载路径

重新创建并验证结果