Author: halfgaar

http://www.halfgaar.net/

Halfgaar is Wiebe. Wiebe is a contributing author on this weblog. He also has a lot of stuff (such as long, in-depth articles) on his personal website.

Wiebe works at YTEC, where he is a senior developer of customer-specific tailor-made software (“klantspecifieke maatwerk software“) for clients in a few select markets: wholesale, printing and healthcare.

Postfix queue: sender and recipient address

I always seem to forget this, and the mailq command is not clear, so here it is: when you type mailq on a postfix server, the first address listed is the sender, the second the recipient. Read More »
By halfgaar, 1 decade ago, on May 04, 2011, at 11:05 | Comments closed

Adding SPF support to Postfix

(Hmm, this suggests the python version might be better). Read More »
By halfgaar, 1 decade ago, on April 28, 2011, at 15:04 | Comments closed

Tracking Xen domU’s with munin

To view statistics of your xen server with Munin (source): Read More »
By halfgaar, 1 decade ago, on April 21, 2011, at 10:04 | 2 comments

Getting a better MySQL prompt

When you want to see which user you are and which database you're working with, put this in .my.cnf: prompt=(\\u@\\h) [\\d]>\\_ Read More »
By halfgaar, 1 decade ago, on April 18, 2011, at 10:04 | Comments closed

Sending yourself a test virus

I found this handy little site to send yourself a harmless test virus. Read More »
By halfgaar, 1 decade ago, on April 14, 2011, at 11:04 | 2 comments

Installing a commercial SSL certificate in Zimbra

Edit: now in 2020, with Zimbra 8, and Startcom out of business, things have changed a bit. So, here are the steps now, for a Sectigo certificate (and referring to their directory structure): Read More »
By halfgaar, 1 decade ago, on April 12, 2011, at 20:04 | 3 comments

Installing Munin-node on a Debian or Ubuntu machine

If you want to gather statistics on a machine with a Munin server, install munin node: aptitude -P install munin-node munin-plugins-extra Read More »
By halfgaar, 1 decade ago, on April 06, 2011, at 14:04 | 4 comments

Fixing locale message in Ubuntu when logging in or SCPing

I've encountered this error occasionally when loggin in: -bash: warning: setlocale: LC_ALL: cannot change locale (nl_NL.UTF-8) Read More »
By halfgaar, 1 decade ago, on March 22, 2011, at 11:03 | 5 comments

Getting a Xen hvc0 on a stock Ubuntu

When you install Ubuntu in Xen with xen-create-image, the console is automatically handled. If you want to add a console to a stock-installed Ubuntu, add this file to /etc/init and call it hvc0.conf: Read More »
By halfgaar, 1 decade ago, on March 18, 2011, at 15:03 | 2 comments

Useful extra Nagios commands

Here are some useful extra nagios commands I often use: define command{ command_name notify-host-by-sms command_line /usr/local/sbin/send-sms.sh -n $CONTACTPAGER$ -m "$HOSTNAME$: $HOSTSTATE$" } Read More »
By halfgaar, 1 decade ago, on March 17, 2011, at 11:03 | Comments closed