Ansible playbook: yum update and reboot as needed

For use with eg CentOS.

Assumes you have a file /etc/ansible/hosts with groups and members already configured.

A properly formatted .yml-file can be found at the end of the article.

What this playbook does:

1. Excludes a member foo.uu.se from the group centos-cli.
2. Doesn't gather facts to speed things up.
3. Updates all packages to their latest version.
4. Compares the running kernel version with the latest installed as a hint if a reboot is needed to activate the latest installed kernel version.
5. Reboots.
6. Waits till the connection is back.

yum.update.with.reboot.as.needed.yml

---
- hosts: centos-cli:!foo.uu.se
  gather_facts: no
  tasks:
 
  - name: upgrade all packages
    yum: name='*' state=latest

  - name: check for reboot hint
    shell: if [ $(rpm -q --last kernel | awk 'NR==1 {print $1}') != kernel-$(uname -r) ]; then echo 'reboot'; else echo 'Kernel is current'; fi
    ignore_errors: true
    register: reboot_hint

  - name: Rebooting ...
    command: shutdown -r now "Reboot required for updated kernel"
    async: 0
    poll: 0
    ignore_errors: true
    changed_when: "reboot_hint.stdout == 'reboot'"
    register: rebooting

  - name: Wait for computer to reboot...
    pause: seconds=60
    when: rebooting|changed
...