Rancher step by step - v2.5.1

First step: \
Make sure you have Docker installed.

Second step: \
We need to run the Rancher Server with some commands, ex.:

sudo docker run -d \
  --restart=unless-stopped \
  --name rancher \
  -p 80:80 \
  -p 443:443 \
  -v /opt/rancher:/var/lib/rancher \
  --privileged \
  rancher/rancher:v2.5.1 --no-cacerts

The --no-cacerts will make sure https://rancher_url/v3/settings/cacerts is empty. \
Remember, this is optional. \
This solve the problem: x509: certificate signed by unknown authority

The --privileged solve kubernetes privileged requirements on the latest versions of rancher.

To use with DNS, and auto-gernerate certificate, just need to add a parameter, like this:

sudo docker run -d \
  --restart=unless-stopped \
  --name rancher \
  -p 80:80 \
  -p 443:443 \
  -v /opt/rancher:/var/lib/rancher \
  --privileged \
  rancher/rancher:v2.5.1 \
  --acme-domain mydomain.com

Third step: \
We need to use rancher-cli official image for run the commands(You can make for yourself an image).

  1. rancher login HOST TOKEN
  2. rancher ps # for see the k8s deployments
  3. rancher kubectl set image deployments/nginx nginx=nginx:latest # for update a deployment

Whith this we can use Rancher CLI commands, for example in Continuous Integration. \
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Enjoy it :D