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DevOps Tools Part 3 - Rancher.md

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DevOps Tools Part 3 - Rancher

Install Rancher

  1. Check that your docker version is supported here.

  2. Install the Rancher server:

    sudo docker run -d --restart=unless-stopped -p 8080:8080 rancher/server:v1.6.17

  3. Open Rancher server console: Open a browser at http://<your server>:8080 and enjoy!

Setup Access Control

  1. Select ADMIN -> Access Control
  2. Click Local
  3. Enter Username and Password
  4. Click Enable Local Auth

Add Rancher Host

  1. Select ADMIN -> Settings
  2. In the Host Registration URL page select Something else and enter URL for this machine (localhost won't cut it!). Be sure to include the port. NAT address is fine if reachable from the Rancher host machines. And here's a quick way to get your internal IP address if you're not certain: 
    ip route get 1.1.1.1 | awk '{print $NF; exit}'
  3. Select INFRASTRUCTURE -> Hosts
  4. Click Add Host
  5. Select Custom (should already be selected)
  6. In item 4 and enter the Rancher host IP address reachable by the host (in this case the same IP).
  7. In item 5 click the copy icon to copy the registration command to the clipboard. It will look something like this: 
    sudo docker run -e CATTLE_AGENT_IP="192.168.0.100"  --rm --privileged -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/rancher:/var/lib/rancher rancher/agent:v1.2.10 http://192.168.0.100:8085/v1/scripts/00000000000000000000:0000000000000:00000000000000000000000000
  8. Open a shell on your host, paste the command above, and hit enter. Then wait a few seconds and your host should be registered with the Rancher server. If successful, the last line displayed in the shell should look like this: 
    INFO: Launched Rancher Agent: 46a328afd7c4a755b9d79c397724e8940b1344ea5be761989bb18d8eeed6c3b3
  9. Now your INFRASTRUCTURE -> Hosts page will show your shiny new host ready deployment of docker containers!

Deploy a Stack

  1. Select CATALOG -> Community to browse the Ranche community catalog in Github
  2. Let's use the fabulous Prometheus stack as an example to deploy. Find the Prometheus app and click View Details
  3. Scroll down and click Launch. Note that here you can specify app deployment parameters including ports. For now defaults are fine.
  4. Wait a few seconds until the apps are running, then point your browser to http://<your host IP>:3000 to see the Prometheus/Grafana console. Select Host Stats to see the pretty graphical host statistics.
  5. The Prometheus stack is great and useful but, since it's so easy to re-deploy, let's remove it! Simply select STACKS -> User, find the Prometheus stack, click the three dots to the far right and select Delete.

Whats Next