Checkmk migration notes

(updated ) Admin Monitoring

I once installed Checkmk into an existing Nagios installation, back then by using a plain source package. This also meant I had to take care of installing and configuring all dependencies like Apache, Nagios and PNP4Nagios. Keeping this setup working was quite tedious over the last two upgrades (1.2.4 to 1.2.6 and finally 1.2.6p16) so I decided to switch to the official Checkmk CRE packages instead. For now I switched to the rather outdated 1.2.6p16 packages to concentrate on migrating my configuration first.

Seafile 5 syncing of old libraries

Admin Seafile

After upgrading to Seafile 5 I observed that my client was not syncing libraries anymore.

It turns out that this happens for libraries that were created long ago (before Seafile 3). According to Seafile issue #975 syncing of Seafile libraries may fail over HTTP(S) if they are stored in an older format on the server.

Monitoring Notifications via Telegram

(updated ) Admin Checkmk Monitoring Telegram

After a self-inflicted downtime of my server that also happens to handle my email I decided that it’s time to have monitoring notifications delivered out-of-band instead of foolishly trying to send them via the most important resource I monitor. Since I recently started using Telegram I decided to give it a try for monitoring notifications. Please note that normal Telegram message contents are unencrypted so they can possibly be read on the Telegram server side!

Seafile on Nginx with uWSGI

Admin Seafile

I’ve been using Seafile as my personal cloud storage for quite some time now and it’s working really really well. Since I’ve departed quite a bit from the standard setup instructions for the web frontend (Seahub) I’m going to document the setup a tiny little bit.

Using nullmailer with STARTTLS and SMTP-Auth


So far I’ve been using Nullmailer only to relay mail from LAN machines to SMTP servers that accept anything from the internal network, a very easy method to forward system messages from various internal boxes without the need to administrate a full-blown MTA.

TV reloaded with HDHomerun


After about two years of complete TV absence both due to technical reasons (TV socket in wrong room on the other side of my flat) as well as the quality of the programme (ads, fake reality shows, lack of real movies), I nevertheless decided to get myself a network-enabled TV-tuner. Being network-enabled was both an easy way to get around the need for new cabling as well as making TV available to all the machines scattered throughout the flat.