title: Ingress nginx cache
body: <p>I'm trying to figure out how to use nginx proxy cache with some specific rules. For exemple, when i'm hosting Ghost or Wordpress, I don't want to cache admin section. Using server snippet, I've tried a lot of different combinaison but still have issues with cache in admin section.</p>
  
  <pre><code>nginx.ingress.kubernetes.io/proxy-buffering: "on"
  nginx.ingress.kubernetes.io/server-snippet: |-
    proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
    proxy_ignore_headers Set-Cookie;
    proxy_cache app_cache;
    proxy_cache_lock on;
    proxy_cache_valid any 30m;
    add_header X-Cache-Status $upstream_cache_status;
  </code></pre>
  
  <p>I want to use nginx code snippet for (ghost|sinout) paths to bypass cache when in admin area, but i'm loosing the proxy_pass context resulting to a 502 bad gateway.</p>
  
  <p>Here is the current ingress config caching every pages, admin path too:</p>
  
  <pre><code>apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    annotations:
      nginx.ingress.kubernetes.io/proxy-buffering: "on"
      nginx.ingress.kubernetes.io/server-snippet: |-
        proxy_cache my_blog_cache;
        proxy_cache_lock on;
        proxy_cache_valid any 30m;
        add_header X-Cache-Status $upstream_cache_status;
        proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
    name: my-blog
    namespace: web
  spec:
    rules:
    - host: blog.example.com
      http:
        paths:
        - backend:
            serviceName: ingress-541322b8660dbd2ceb1e8ff1813f0dd5
            servicePort: 2368
          path: /
    tls:
    - hosts:
      - blog.example.com
      secretName: my-blog-cert
  status:
    loadBalancer:
      ingress:
      - ip: 1.2.3.4
  </code></pre>
  
  <p>Here is the nginx config i'm trying to get but not compatible with ingress annotations:</p>
  
  <pre><code>   location / {
          proxy_cache my_blog_cache;
          proxy_cache_valid 200 30m;
          proxy_cache_valid 404 1m;
          proxy_pass http://ghost_upstream;
          proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
          proxy_ignore_headers Set-Cookie;
          proxy_hide_header Set-Cookie;
          proxy_hide_header X-powered-by;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          expires 10m;
      }
      location /content/images {
          alias /path/to/ghost/content/images;
          access_log off;
          expires max;
      }
      location /assets {
          alias /path/to/ghost/content/themes/uno-master/assets;
          access_log off;
          expires max;
      }
      location /public {
          alias /path/to/ghost/core/built/public;
          access_log off;
          expires max;
      }
      location /ghost/scripts {
          alias /path/to/ghost/core/built/scripts;
          access_log off;
          expires max;
      }
      location ~ ^/(?:ghost|signout) { 
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header Host $http_host;
          proxy_pass http://ghost_upstream;
          add_header Cache-Control "no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0";
      }
  </code></pre>
  
  <p>Thanks for your help !</p>