如何通过Nginx通过subpath挂载子配置文件

configmap 挂载在容器的路径中会覆盖掉容器路径下原有的文件，如何支持 configmap 的每个 key-value 挂载在容器中，且不会覆盖掉原目录下的文件。

可以通过 subpath，挂载到容器的子路径中。

1. configmap yaml文件

apiVersion: v1
kind: ConfigMap
metadata:
  name: configmap-subpath
  namespace: default
data:
  example.subpath.1: subpath1     
  example.subpath.2: subpath2
  example.subpath.file: |-
    property.1=value-1
    property.2=value-2
    property.3=value-3

2. 创建 configmap

$ kubectl apply -f subpath-cm.yaml

3. 查看创建的 configmap

$ kubectl get cm configmap-subpath -n default
NAME                DATA   AGE
configmap-subpath   3      31s

4. pod yaml 文件

apiVersion: v1
kind: Pod
metadata:
  name: configmap-subpath-test
  namespace: default
  labels:
    purpose: configmap-subpath-test
spec:
  containers:
  - name: configmap-subpath-test 
    image: nginx
    volumeMounts:
      - name: config-volume
        mountPath: /etc/nginx/conf.d/example.subpath.file   
        subPath: example.subpath.file         
  volumes:
  - name: config-volume
    configMap:
      name: configmap-subpath

5. 创建 pod

$ kubectl apply -f pod-configmap.yaml

6. 查看 pod

$ kubectl get pod -n default
NAME                     READY   STATUS      RESTARTS   AGE
configmap-subpath-test   1/1     Running     0          9m38s

7. 验证

# 查看/etc/nginx/nginx.conf被覆盖
$ kubectl exec -it -n default configmap-subpath-test -- cat /etc/nginx/nginx.conf
user  nginx;
worker_processes  auto;

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


events {
    worker_connections  1024;
}


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;
}
# 查看挂载文件
$ kubectl exec -it -n default configmap-subpath-test -- cat /etc/nginx/conf.d/example.subpath.file
property.1=value-1
property.2=value-2
property.3=value-3

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