https://github.com/codylane/ansible-playbook-change-hostname

A ansible playbook to help fix /etc/hosts, re-name your hostname, reboot and validate. Yay!
https://github.com/codylane/ansible-playbook-change-hostname

Last synced: 4 days ago
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A ansible playbook to help fix /etc/hosts, re-name your hostname, reboot and validate. Yay!

• Host: GitHub
• URL: https://github.com/codylane/ansible-playbook-change-hostname
• Owner: codylane
• License: mit
• Created: 2016-10-20T21:20:33.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2021-02-21T21:41:45.000Z (almost 4 years ago)
• Last Synced: 2023-08-03T01:12:11.269Z (over 1 year ago)
• Homepage: https://github.com/codylane/ansible-playbook-change-hostname
• Size: 3.91 KB
• Stars: 25
• Watchers: 2
• Forks: 22
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: change_hostname.yaml
  • License: LICENSE

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README

        
# ansible-playbook-change-hostname

A ansible playbook to help fix /etc/hosts

# Overview

This was created from some snippets I found online and put it all together in a single place. This is really just here for my own reference. 

Here are the links that I owe credit to:

* https://support.ansible.com/hc/en-us/articles/201958037-Reboot-a-server-and-wait-for-it-to-come-back

# Howto use this playbook

## Define an inventory file in your current directory

```

[all]

foo-app-01.example.com

foo-app-02.example.com

foo-app-03.example.com

foo-app-03.example.com

```

So, in order for this to work `foo-app*.example.com` must be resolvable by DNS and these are the values you want your hostnames to become.  If your hosts are not resolvable in DNS you can create a node alias in your inventory file as follows.

```

[all]

foo-app-01.example.com  ansible_ssh_host=1.2.3.4

foo-app-02.example.com  ansible_ssh_host=1.2.3.5

foo-app-03.example.com  ansible_ssh_host=1.2.3.6

foo-app-03.example.com  ansible_ssh_host=1.2.3.7

```

After your hostnames are updated, you can also pass a parameter on the command line to reboot.  Here's how to do that.

```

ansible-playbook -e 'reboot=True' -i inventory change_hostname.yaml

```

Finally, if all goes well the last step is a vaildation routine that makes sure your remote clients hostname matches your `inventory_hostname` you defined in your inventory.  You might need to blow away the `tmp/ansible-facts` cache dir for this to succeed, however.