Category: linux

The problem

Recently I found out that PHP 7.4 is going to reach End Of Life at the end of November, 2022. This was an unfortunate situation considering I have several websites running on a couple of Ubuntu Server 20.04 DigitalOcean Droplets. It’s unfortunate because I found out that the only supported version of PHP for Ubuntu Server 20.04 is the soon to be obsolete version 7.4.

The Solution

There are two ways to do this – upgrade PHP via a PPA on Ubuntu 20.04, or upgrade Ubuntu to 22.04. I already upgraded my desktop without any issues, so I went with the latter option.

I will outline the procedure I used below. It went without a hitch, apart from having to do it twice due to a broken WordPress plug-in. I am embarrassed to admit that the plug-in was my own creation (in my defense I am not a PHP developer)

1. Check all WordPress plug-ins for compatibility with PHP 8.1
2. Create a snapshot of the Droplet
3. Use the snapshot to create a new Droplet with the same specs as the old one.
4. Power on the new server, login and proceed to upgrade to 22.04. I used screen to keep the upgrade process alive in case of ssh dropout.
5. Once this process is completed, you still need to switch the version of PHP that Apache is using (I’m not sure if this is necessary for Nginx). It was something like:
   sudo a2dismod php7.4
   sudo a2enmod php8.1
   sudo service apache2 restart
6. In the control panel, switch over your website’s DNS to point to the new domain. Depending on TTL this can take a while to propagate – I did mine one at a time and checked them with the ping command.
   ping circusscientist.com – returns the IP address
7. If anything went wrong, it’s easy to switch back to the old 20.04, so I left that running for a few days. Worpress.org has some great articles here and here which I sometimes use to help with troubleshooting
8. Finally, switch off the old 20.04 server and remember to delete it (keep the snapshot, though, just in case!)

At home we have a bunch of old Android devices and laptops. The laptops all have some version of Linux running on them by now, but so far I have only had limited use for the oldest Android devices. I have an old S3 mini for example which has a great screen, but unfortunately LineageOS (the Android Upgrade) latest version available is Nougat, and that runs rather slowly. Besides, I already have two Android devices working with later versions.

PostmarketOS is a fairly new project with the goal of porting Alpine Linux (really small) with mainline kernel to ALL Android devices. Also you can run all types of UI on top of postmarketOS for example Plasma Mobile. I just wanted to see if I could have a device with WiFi which I could use to run some Bash scripts, c programs and possibly Python.

Here is how it works:

1. You need a computer running linux – install the pmbootstrap program
2. put phone into fastboot mode – making sure to follow instructions on postmarketOS wiki – S3 mini page was here
3. after following the install guide (really comprehensive and simple), and choosing the kernel (mainline or the old one from Android), the Desktop (mate, xfce, plasma mobile, and many more), just run the install scripts
4. ssh into phone via usb (or just use the phone touch screen)
5. to install any program (from alpine linux) type apk add <program>
6. a good one to have is corekeyboard (onscreen keyboard for phone)

So here it is then: Mate desktop running on postmarketOS in my S3 mini. (not mainline kernel though):

So far I have not been able to get WiFi working, or Bluetooth, however there is an option to share the laptop internet via USB, so I can still install programs. I installed gcc and compiled and ran a c program, and of course a shell script. This is really a great project and worth checking out if you have an old phone or two lying around.