Upgrading servers can be done with the following command:
make upgrade-servers
To query servers for current versions of OS and software:
make query-servers
The ssh keys that are defined in group_vars/ssh_keys.yml will be written to the given host for the provision and deploy user. To do this, use the following command:
make provision-ssh-keys
When upgrading to a new version of php, you need to clean up old php packages
To list installed php packages, use apt list --installed php*.
To remove old installed packages, use sudo apt remove --purge --autoremove phpX.X*