• There's life in the old dog yet - HP Integrity RX2600 EFI Unexpected TRAP

    calendar Sep 17, 2013 · 3 min read · hp hp-ux  ·
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    A couple of months ago I installed Red Hat Enterprise Linux on a dedicated hard drive of my HP Integrity RX2600 servers. Because the installation programm doesn't support the native Management Processor console I had to connect a screen, keyboard and mouse to the device. The installation worked like a charm and after a …
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  • Short tip: Disable IPv6 completely under RHEL / CentOS

    calendar Sep 6, 2013 · 1 min read · kurztipp  ·
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    Use the following commands to completely disable IPv6 under RHEL / CentOS up to version 6:

    1# echo "options ipv6 disable=1" > /etc/modprobe.d/ipv6.conf
2# chkconfig ip6tables off
3# shutdown -r now

    A module parameter prohibits IPv6 functionality after the next reboot. If this value wasn't set, some services …


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  • Persistent txqueuelen network parameter using udev

    calendar Aug 21, 2013 · 2 min read  ·
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    txqueuelen is one of many configurable networking parameters. This paremeter defines the queue size in which the kernel stores data before it is sent over the network. By default this parameter has a value of 1000 - depending on your application you might want to increase this value using ifconfig or ip:

    1# ifconfig …

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  • Software and configuration management made easy using RPM

    calendar Jun 30, 2013 · 18 min read  ·
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    If you're maintaining multiple Red Hat Enterprise Linux systems (or equivalent offsets like CentOS or Scientific Linux) your administration work with the particular hosts will gain in a routine. Because even the best administrator might forget something it would be advantageously to have a central software and …
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  • Eject all CD-ROMs in a VMware cluster

    calendar Jun 18, 2013 · 3 min read · esxi powercli  ·
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    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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  • High-availability ad absurdum - instant messenger cluster using DRBD and Finch (Pidgin)

    calendar May 9, 2013 · 15 min read · debian raspberry-pi  ·
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    It is often unjustifiable said that implementing high-availability under Linux is way too complex. Of course you will have to be patient while spending some time in learning the required basics - but all this is feasible for an experienced administrator (or someone who wants to be such an administrator some day). This …
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  • iOS and IPCop/IPFire OpenVPN

    calendar May 2, 2013 · 2 min read · ios ipcop ipfire openvpn  ·
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    <img
  loading="lazy"
  decoding="async"
  alt="OpenVPN-Profile"
  
    class="image_figure image_internal image_unprocessed"
    src="https://cstan.io/images/2013/05/1-Profile.jpg"
  
  
/>

</picture>

    OpenVPN …


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  • Default gateway ignored under RHEL / CentOS 5.3

    calendar Apr 23, 2013 · 1 min read  ·
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    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 …


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  • CDE under Debian Squeeze

    calendar Apr 15, 2013 · 2 min read · cde retro  ·
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    Many administrators or IT enthusiasts still might know Common Desktop Environment (CDE) from old UNIX days. Introduced in 1993, it was Unix's standard desktop for HP-UX, IBM AIX, Sun Solaris and Tru64 for more than 10 years. Even if Solaris dropped its CDE support 3 years ago, the old desktop is still used in HP-UX, …
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  • Obsolete tools: nslookup & ifconfig

    calendar Apr 7, 2013 · 3 min read  ·
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    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 …


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