SSH on Port 995

So, it turned out my workaround of putting SSH on the non-SSL IMAP port 143 wasn’t a great idea and I figured out something much more simple.

Of course, a cPanel update broke that workaround, so rather than futz with IMAP settings again, I disabled POP3.  That freed up 995 and 110.  So, I put SSH on 995 and cPanel doesn’t freak out with that.

Much easier, no need to muck with config files other than sshd_config, and it works just fine at the hospital with sshuttle.

Cleaning up old kernels on an Ubuntu box

So, I’m piddling around, cleaning up old kernels on my crappy Ubuntu server.  I thought I’d make a note for future reference, I always have to Google whenever it occurs to me to do this.

Find the running kernel (so I know what not to delete):

root@schoolserver:~# uname -r

Here’s what I’ve got installed:

root@schoolserver:~# dpkg --list | grep linux-image | grep -v module
ii  linux-image-3.19.0-43-generic        3.19.0-43.49~14.04.1                 i386         Linux kernel image for version 3.19.0 on 32 bit x86 SMP
ii  linux-image-3.19.0-47-generic        3.19.0-47.53~14.04.1                 i386         Linux kernel image for version 3.19.0 on 32 bit x86 SMP
ii  linux-image-generic-lts-vivid                         i386         Generic Linux kernel image

Lemme remove the old, unused one:

root@schoolserver:~# apt-get purge linux-image-3.19.0-43-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-42 linux-headers-3.19.0-42-generic
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  linux-image-3.19.0-43-generic* linux-image-extra-3.19.0-43-generic*
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
After this operation, 155 MB disk space will be freed.
Do you want to continue? [Y/n] y

There’s no power button on this weird machine, it boots when you plug it in.  My workaround for powering it off is that I’ve set the grub timeout to 3 minutes. Reboot, then unplug it at the grub menu.