If one etcd node is no longer a member of the remaining etcd cluster or fails to connect you need...

This card is just about creating simple PostgreSQL dumps. This is no instruction for a backup strategy nor a guide...

Hint This applies only to distributions based on Debian. Requirement You need to setup the PostgreSQL Apt Repository first.

on the bash (issued as postgres user) Start/Stop/Restart PostgreSQL pg_ctl -D $configdir start|stop|restart Start/Stop/Restart the corresponding PostgreSQL...

If you're trying to start a cloud-init based Ubuntu VM with KVM you will suffer long boot times...

When receiving a new SSL-Certificate for an existing SSL-key it should be checked that they match cryptographically.

Don't use exec without user parameter If you use exec without user parameter, the command will get executed as...

If you want to perform a failover on another haproxy backend server this is the way you should do it...

The puppet server caches custom functions. If you edit an existing function (e.g. while you’re developing it), you’ll...

Sending a testmail from a server with a configured exim is easy as pie. From your usershell: tell exim that...

Bash stores the exitcodestatus of piped commands in the environment variable PIPESTATUS So you can just echo ${PIPESTATUS[@]} to get...

If you need the debug output of the puppetmaster running with passenger you have to uncomment this setting in the...

Investigate why mails are frozen The exim documentation says: Freezing occurs when a bounce message encounters a permanent failure because...

Install and configure the AWS Command Line Interface Show existing certificates to test if the AWS Cli is working:

I'm creating certificate requests with this command: openssl req -new -out www.example.com.csr -keyout www.example.com.key -newkey rsa:2048 -nodes

Create a 1 GB file to swap to (we have sufficient space on / on this machine. Use a different partition...