Every VMware administration knows the following issue - the cluster needs to patched and so the particular nodes need to be rebooted. Fortunately this doesn't bother the users working on the farm becuase the virtual machines can be moved "online" between the cluster nodes.

There might be a little show stopper …

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OpenVPN …

On RHEL or CentOS 5.3 it is possible that a noticed default gateway is ignored. In this case the routing table doesn't contain any appropriate entry...

1# netstat -r|grep default

...even if the gateway was noticed both in the main network configuration...

1# cat /etc/sysconfig/network
2...
3GATEWAY=10.24.36.1

...and …

nslookup and ifconfig are two well-known tools for configuration the network of Unix/Linux hosts and checking whether DNS is working properly.

ifconfig was part of the 4.2BSD distribution in 1983 for the first time and quickly became the standard tool for network configuration - even commerical Unices like Solaris or …

. Meanwhile there are plenty of operating systems available for the Raspberry Pi - including an ARM version of the source-based Linux distro CRUX.

So if you like handcrafting or think Raspbian is "too mainstream", you can have a lot of fun with a SD card with at least 1 GB of memory and a pot of coffee. 😉 …

If you install and configure a Postfix mail server for relaying mails using an external smarthost you might be puzzled about the following error message:

1Mar 19 17:00:22 hostname01 postfix/smtp[2003]: warning: SASL authentication failure: No worthy mechs found

The reason for this issue can be really trivial - in my …

Hint: The following issue has been fixed by a RHEL / CentOS patch (util-linux-ng) - just update your system!

If you want to install Open Monitoring Distribution on RHEL or CentOS 6.4, you might have the problem that creating sites isn't working as expected:

1# omd create test
2Adding /omd/sites/test/tmp to /etc/fstab. …