Selenium node/chrome docker image and selenium/hub docker image in different host machines

Question

I have a situation where i have to use the node/chrome and selenium/hub images in different host machines. However problem is although i am linking them in the ansible role as below:

- name: seleniumchromenode container
  docker:
    name: seleniumhubchromenode
    image: "{{ seleniumchromenode_image }}"
    state: "{{ 'started' }}"
    pull: always
    restart_policy: always
    links: seleniumhub:hub

It doesnt get linked , or in other words the hub is not discovering the node. Please let me know if linking works only when the hub and node are within the same host machine.

Assaf Lavie · Accepted Answer · 2017-02-28 15:50:29Z

3

Links don't work across machines. You can either specify the IP address/hostname and let it connect through that, or you can use Docker Swarm Mode to deploy your containers - that lets you do something very close to linking (it sets up a mesh network across the swarm nodes, so services can find each other).

Simplest: just pass the hostname in Ansible.

answered Feb 28, 2017 at 15:50

Assaf Lavie

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1 Comment

trial999 Over a year ago

Thanks, i have managed to solve this as per your suggestion posting the code here if it will help anyone:

trial999 · Accepted Answer · 2017-03-01 17:26:45Z

Below is what finally worked for me. Note that the SE_OPTS is necessary for the node to be able to link successfully to the hub that is on a different host.

- name: seleniumchromenode container
  docker_container:
    name: seleniumhubchromenode
    image: "{{ seleniumchromenode_image }}"
    state: "{{ 'started' }}"
    pull: true
    restart_policy: always
    exposed_ports:
      - "{{seleniumnode_port}}"
    published_ports:
      - "{{seleniumnode_port}}:{{seleniumnode_port}}"
    env:
      HUB_PORT_4444_TCP_ADDR: "{{seleniumhub_host}}"
      HUB_PORT_4444_TCP_PORT: "{{seleniumhub_port}}"
      SE_OPTS: "-host {{seleniumnode_host}} -port {{seleniumnode_port}}"
      NODE_MAX_INSTANCES: "5"
      NODE_MAX_SESSION: "5"

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