Tuesday, April 30, 2024

Things I learned Reinstalling My Ubuntu

I did not want to wait for Ubuntu Studio 24.04 to be offered as an update to 23.10, so I got the installer and tried it.  Also, I thought I would try repartitioning the disk as UEFI.

Brief notes:

  • I did not feel in control of manual partitioning
  • I found out one of my USB sticks is bad, thanks to F3…
  • …and no thanks to the Startup Disk Creator!
  • If the X11 window manager crashes/doesn’t start, goofy things happen
  • Wayland+KWin still don’t support sticky keys, smh
  • snap remove pops up the audio device overlay… sometimes repeatedly
  • I depend on a surprising amount of configuration actually

Tuesday, April 23, 2024

Getting fail2ban Working [with my weird choices] on Ubuntu 22.04 (jammy)

To put the tl;dr up front:

  1. The systemd service name may not be correct
  2. The service needs to be logging enough information for fail2ban to process
  3. Unrelatedly, Apple Mail on iPhone is really bad at logging into Dovecot
  4. Extended Research

[2024-04-26: Putting the backend in the DEFAULT section may not actually work on all distributions.  One may need to copy it into each individual jail (sshd, postfix, etc.) for it to take effect.]

A minimalist /etc/fail2ban/jail.local for a few services, based on mine:

backend = systemd
enabled = true
journalmatch = _SYSTEMD_UNIT=ssh.service + _COMM=sshd
enabled = true
journalmatch = _SYSTEMD_UNIT=postfix@-.service
enabled = true
journalmatch = _SYSTEMD_UNIT=pure-ftpd.service

(The journalmatch for pure-ftpd removes the command/_COMM field entirely.)