Raspberry Pi power saving (disable HDMI port and others) – the SystemD way

For a few year I have been playing with Raspberry Pi’s. I started off with a 1B, then moved to a a 2B and for some time am heavily using a model 3B as my monitoring (nagios) server while the 2B is being setup for other use (as well as a few Pi Zero’s being used for other things).

Since the switch to the 3B I started to have more and more issues with the SD card getting corrupt. Actually, it wasn’t the card itself but critical files tended to get corrupted, making the system unusable after a while – one of the reasons  I scripted the setup of my monitoring server using Ansible). Recently I found this discussion on stackexchange which hinted me on the root cause of my problems – the Raspberry Pi 3B really needs a 2.5A power supply to function correctly.

Continue reading “Raspberry Pi power saving (disable HDMI port and others) – the SystemD way”

MacOS Server Replacement #2 – Migrating PostgreSQL

As part of the migration of my MacOS Server to Linux the next service to migrate is my PostgreSQL engine. Although PostgreSQL had already been hidden in MacOS Server for some time, it still was included (as internal services like ProfileManager and Calendar and Addressbook Server depend on it.  Despite it being hidden, I had still enabled it (manually) and hosted my PostgreSQL databases on my MacOS Server for ages. Despite migrations sometimes being a pain (i.e. not automatic) this worked well so far, including integrating it with the MacOS Server way of using transaction logs for offline backups. (so I will also have to look for a new way to do this). Continue reading “MacOS Server Replacement #2 – Migrating PostgreSQL”

MacOS Server Replacement #1 – Migrating MySQL to MariaDB

As part of the migration of my MacOS Server to Linux the first service to migrate is my MySQL 5.7 engine. Although MySQL is not part of MacOS Server anymore for a long time (and I had installed it separately), I will cover the migration here as 1) I still had it running on my MacOS Server and 2) the migration wasn’t smooth so decided to share my learnings here. Continue reading “MacOS Server Replacement #1 – Migrating MySQL to MariaDB”