Cadvisor: Re: cAdvisor + nginx in different then "/" context

[AnthonyWC]

Original issue was closed but I think it was never fixed (reverted in a pull request)?

See: https://github.com/google/cadvisor/issues/667
See: https://github.com/google/cadvisor/pull/680

Original post:

Hello,

I'm trying to run cAdvisor docker image with nginx proxy. The problem is that I need to set up a proxy from different then root context - my goal is to have cAdvisor running behind e.g. http://localhost/cadvisor/ Here is my exemplary nginx config:

server {
listen 82;
server_name ${HOSTNAME};

set $cadvisor cadvisor.docker;

location ~ ^/cadvisor/(.)$ {
rewrite ^/cadvisor/(.) /$1 break;
proxy_pass http://$cadvisor:8080;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 150;
proxy_send_timeout 100;
proxy_read_timeout 100;
proxy_buffers 16 64k;
proxy_busy_buffers_size 64k;
client_max_body_size 256k;
client_body_buffer_size 128k;
}
}
The problem is that application assumes that the web context is set to "/", that's why I get redirected to http://localhost:82/containers/ after accessing http://localhost:82/cadvisor/

Is it possible to define application base context path to make cadvisor running behind custom nginx location? Any help will be appreciate

[sebhoss]

I came up with the following config which seems to work ok for now:

server {
    listen 443 ssl;
        server_name dashboards.domain.tld;

    location /cadvisor/ {
        proxy_pass http://cadvisor-host:12345/;
        proxy_redirect ~^/containers/ /cadvisor/containers/;            
        proxy_redirect ~^/docker/ /cadvisor/docker/;
    }
}

cAdvisor is available at https://dashboards.domain.tld/cadvisor once the config is loaded

[Trane9991]

I tried to route cadvisor ui to /cadvisor with traefik and couldn't make it work.

[mfominov]

@sebhoss add 1 more redirect
proxy_redirect ~^/metrics/ /cadvisor/metrics/;

[davidnewhall]

What I did.

set $cadvisor  http://cadvisor:8080;

location  ~  ^/cadvisor(?<requesturi>.*) {
  proxy_pass     $cadvisor$requesturi;
  proxy_redirect ~^(/.*) /cadvisor$1;
}

[corytheboyd]

If anyone else is trying to get this to work through docker-compose, where nginx serves as a reverse proxy to cadvisor on the /admin/cadvisor/ path, this is the configuration that worked for me:

docker-compose entry:

  cadvisor:
    container_name: cadvisor
    build:
      context: .
      dockerfile: projects/cadvisor/Dockerfile
    command:
      - '-port=80'
      - '-url_base_prefix=/admin/cadvisor'
    volumes:
      - "/:/rootfs:ro"
      - "/var/run:/var/run:ro"
      - "/sys:/sys:ro"
      - "/var/lib/docker:/var/lib/docker:ro"
      - "/dev/disk:/dev/disk:ro"
    expose:
      - 80

The relevant: nginx configuration

    location  ~* /admin/cadvisor/.*$ {
        proxy_pass http://cadvisor;
    }

My docker-compose configuration is a bit atypical, so don't copy/paste that expecting it to work with your project as-is.

[iCodePup]

Hello,
Someone have success with traefik reverse proxy ?
The following does not work :

 cadvisor:
    container_name:cadvisor
    image:  gcr.io/google-containers/cadvisor:latest
    restart: always
    privileged: true
    networks:
      - back-network
    ports:
      - "8080:8080"
    command:
      - '-url_base_prefix=/cadvisor'
    volumes:
      - /:/rootfs:ro
      - /var/run:/var/run:rw
      - /sys:/sys:ro
      - /var/lib/docker/:/var/lib/docker:ro
    labels:
      - "traefik.http.routers.cadvisor.rule=Host(`localhost`) && PathPrefix(`/cadvisor`)"
      - "traefik.http.services.cadvisor.loadbalancer.server.port=8080"