We want to make the following firewall rule to be applyable to different network interfaces (for e.g. different environments...

You can use proxy_hide_header in different contexts: Syntax: proxy_hide_header field; Default: — Context: http, server, location

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...

swaks is a very nice tool to test SMTP. For the most linux distributions you can easily install it with...

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...