Ansible is so useful - Even for someone who doesn't know how to use it!

I love Ansible!  It is so useful even though my skills with it are very minimal, it is so powerful and useful.  I have about 80 or 90 playbooks that I use over and over.  They're all pretty simple but they get things done.  I forget when and where I can use ad-hoc ansible commands.  I love it when those work though.  I thought I could use ad-hoc to view /etc/resolv.conf and goofed around with -shell and had no success.  Then I found this I had written 13 months ago:

- hosts: all
  sudo: yes
  tasks:
  - name: Display /etc/resolv.conf
    shell: cat /etc/resolv.conf
    register: resolv

  - name: Debug resolv
    debug: var=resolv

  - name: Debug resolv.stdout as part of a string
    debug: msg=`{{ resolv.stdout }}`

Codename: Ubuntu Rusty

Just call me Rusty -  with regards to Ubuntu anyway.  Man!  I can't remember how to set the IP in the old Ubuntu.  Now, 18.04 has changed yet again.  I'm a RHELish* user when I'm not using Slackware for my own personal desktop.  Don't get me wrong - Ubuntu is a fine desktop.  I used it from '04 to '09 parting ways when the Unity desktop came into play.  I did enjoy Xubuntu and then later Lubuntu but found my 5+ years of 'buntu had weakened my RHELish skills much in the way the last (nearly 10) years has mu 'buntu skills SO I switched back.  Actually, I always load Ubuntu for other people (non-Unix folks) who want to salvage an old laptop or old desktop that ran Windows 7 or something.  I've had some success stories there.  But I digress.  

This is just a place to save these commands so I don't have to hunt them up YET AGAIN.  

Changing an Ubuntu 18.04 LTS server's name

This is pretty easy.  

$ sudo hostnamectl set-hostname linuxconfig

This note is not (currently) for me: Check for the existence of /etc/cloud/cloud.cfg and change preserve_hostname: false to preserve_hostname: true

Changing the static IP of an Ubuntu 18.04 LTS server

This is no longer in the /etc/network/interfaces.  Instead look in /etc/netplan (sudo -s first or it will not auto-complete leading me to believe it didn't exist).  The file is 50-cloud-init.yaml.

That is all I have to say since this note is mainly for me.  Hopefully I'll know what else to do when I need this information again. 


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*RHELish (pronounced "relish") is the term I coined for Red Hat -like based systems such as (of course) Red Hat Enterprise Linux, CentOS, Scientific Linux and Oracle Linux.