Prevent the restart of daemons from Debian package upgrades. Proper written postinstall scripts for Debian packages utilize deb-systemd-invoke...
Sometime we've seen this error when executing e.g. bundle exec rake asset:precompile: double free or corruption (out)
sudo gitlab-rails console Note This takes some minutes to start Send a mail Use the following...
If you want someone to be able to access your rails console, but don't want them to be able...
Apply Test Driven Development(TDD) to the process of building container images by defining test before writing code and automate...
If you want to automatically delete old container images from your Elastic Container Registry, the solution is a quite simple...
We often do some HTTP requests to fetch the data we want to check for certain criteria. Testing this in...
A convenient way to test SNS Subscription Filter Policies is using an email address as the subscription endpoint. However, for...
A lot of web applications require being called over https, which is a good thing. It's possible to configure...
You can execute systemctl --user --failed to check for failed systemd user units. But let's face it: It's...
We had a strange behaviour on one of our mariadb-servers: Everyday at around midnight we saw that the root...
When changing glibc versions, it's possible to end up with corrupt indexes in PostgreSQL. Are My Indexes Affected?
Nginx is capable of forwarding a unix socket to UDP backend servers. This is quite handy for load balance syslog...
You might use screen or tmux to run a temporary command on a server which continues to run after the...
When using many or very long entries of MIME-types that shoudl be gziped in gzip_types directives in nginx...
In our monitoring, RabbitMQ queues like aliveness-test may show up as unresponsive, with a ping timeout after 10 seconds...
After performing a live migration of a VM you may encounter issues with the clock of the migrated VM. The...
If you get e.g. this error message when you try to run puppet agent: Error: Failed to apply catalog: undefined...
This is not encouraged because this change is easily forgotten. We recommend using this only if you know what you...
If a systemd service unit is blocked by rate limiting (see in documentation) you can reset the failcounter via:
There are two ways within systemd to manage the fact that you need the gluster service active before mounting the...
You can use wscat: sudo apt-get install node-ws # wscat -c ws://echo.websocket.org connected (press CTRL+C to quit...
The puppet server caches custom functions. If you edit an existing function (e.g. while you’re developing it), you’ll...
swaks is a very nice tool to test SMTP. For the most linux distributions you can easily install it with...