Openshift中Configmap的使用

先基于外部镜像构建一个deployment

ericdeMacBook-Pro:nginx ericnie$ oc new-app ericnie2017/nginx:v1. --allow-missing-images --name=nginx-demo -n myproject
--> Found Docker image 48a076d ( minutes old) from Docker Hub for "ericnie2017/nginx:v1.0"

    * An image stream will be created as "nginx-demo:v1.0" that will track this image
    * This image will be deployed in deployment config "nginx-demo"
    * Ports /tcp, /tcp will be load balanced by service "nginx-demo"
      * Other containers can access this service through the hostname "nginx-demo"
    * WARNING: Image "ericnie2017/nginx:v1.0" runs as the 'root' user which may not be permitted by your cluster administrator

--> Creating resources ...
    imagestream "nginx-demo" created
    deploymentconfig "nginx-demo" created
    service "nginx-demo" created
--> Success
    Application is not exposed. You can expose services to the outside world by executing one or more of the commands below:
     'oc expose svc/nginx-demo'
    Run 'oc status' to view your app.

生成Route

ericdeMacBook-Pro:nginx ericnie$ oc expose svc nginx-demo --hostname=nginx-demo-myproject.192.168.99.100.nip.io
route "nginx-demo" exposed

访问8080端口成功。

查看镜像中的nginx.conf,发现最后配置是调用的config.d下的应用配置文件

$ cat nginx.conf

user  nginx;
worker_processes  ;

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

events {
    worker_connections  ;
}

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  ;

    #gzip  on;

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

然后建立一个nginx.conf文件,将8080端口修改为8011

ericdeMacBook-Pro:nginx ericnie$ cat nginx.conf
server{
    listen  ;
    server_name _;
    location /{
      root  /usr/share/nginx/html;
      index index.html index.htm;
    }
    error_page     /50x.html;
    location = /50x.html {
      root  /usr/share/nginx/html;
    }
}

生成一个configmap

ericdeMacBook-Pro:nginx ericnie$ oc create configmap nginx-conf --from-file=nginx.conf
configmap "nginx-conf" created

在OKD的resource的configmap下看到

查看目前的pod配置文件目录

切换回configmap,然后选择Add to Application

保存后openshift会构建新的实例，原有应用访问失败

修改Service后访问成功。