With WordPress 5.2 I decided to leave my CentOS 7 installation as it required PHP 5.6.20 or higher and my CentOS only had 5.4.16. Yes, I could have manually upgraded PHP from alternative CentOS repositories but I decided not to. While CentOS has been stable for me and I had pretty much no issues with it, that stability came at the cost of slow or non-existent new features. Biggest example being stuck in pre-HTTP2 times.
It took me a while to decide which distribution to use as a replacement, the final candidates being Debian and Ubuntu. While I was really tempted to go with Debian due to its reputation, I decided to go with Ubuntu at the end. It was due to frequency of updates more than anything else. After sticking with CentOS for so long, I wanted something more dynamic.
Most of my setup scripts needed just a simple replacement of
apt-get, the only major hurdle presented switching from CentOS Apache (httpd) to Ubuntu's Apache (apache2). Despite both being 2.4, differences were significant enough that I couldn't just move my config files. So I went with true and tested way of gradually modifying my config file until I could actually start Apache.
The first hurdle was how to install it. My CentOS installation used
php-gd packages. The equivalent Ubuntu setup consisted of
php-gd. Essentially only the SSL package was missing from list and only because Apache2 already contained it.
The first error appeared with User and Group setting. While CentOS uses
apache, the Ubuntu needs
www-data. Remember that you need to change this not only in config file but that a
chown or two might be needed.
The biggest issue were includes. On CentOS I used the following collections:
On Ubuntu there is no equivalent. One has to either use wildcards to load all or list each include separately. Since list of enabled modules is rather conservative, I decided to use wildcards:
Due to aforementioned conservative list of enabled modules, I had to enable a few more:
And yes, this is not strictly speaking equivalent of CentOS configuration but it's close enough for my WordPress installation. Depending on your exact setup, you might need to enable a few more (or choose to skip some).
The last change I had to do was for firewall. As Ubuntu uses
ufw, the following commands were needed to allow traffic through:
ufw allow 'Apache'
ufw allow 'Apache Secure'
sudo ufw reload
And now my WordPress runs on Ubuntu. :)