```yaml
apiVersion: v1
data:
  nginx.conf: |
    user  nginx;
    worker_processes  1;

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

        keepalive_timeout  65;

        server {
            listen       80;
            server_name  localhost;

            error_page   500 502 503 504  /50x.html;

            resolver kube-dns.kube-system.svc.cluster.local valid=3s ipv6=off;
            set $test test-svc.test.svc.cluster.local:80

            location  / {
                proxy_connect_timeout   10;
                proxy_send_timeout      30;
                proxy_read_timeout      30;
                proxy_set_header Host $host;
                proxy_pass http://$test;
                proxy_redirect    off;
                proxy_set_header X-Forwarded-For  $remote_addr;
                proxy_set_header        X-Real-IP       $remote_addr;
                proxy_pass_request_headers              on;
            }
        }
    }
kind: ConfigMap
metadata:
  name: nginx-cm
  namespace: srm
immutable: true  # cm不可变

```