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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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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Red Hat Network Satellite and SUSE Manager are two management suites for the Linux enterprise distros Red Hat Enterprise Linux and SUSE Linux Enterprise Server. At first sight these products look very similar to each other and there are also technical analogies because the products are based on the same core code: …

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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 …

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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. …

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It is possible that the DELL OMSA inventory collector crashes on 64-bit RHEL systems with the following error message: 1# /opt/dell/srvadmin/sbin/invcol 2/opt/dell/srvadmin/sbin/invcol: ./invcol: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory What a pity! This issue needs to be fixed if you want to …

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Today Red Hat released the fourth update of Red Hat Enterprise Linux 6. After 8 months there's also another update that brings a lot of fixes and new features. The Release Notes für RHEL 6.4 are, as usual, very considerably - I personally think, that the following updates are specially mentionable: Kickstart Using th …

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Since a few years Red Hat is awarding a free ticket (incl. flight and hotel) for their own "Red Hat Summit" exhibition in Boston/Massachusetts in line with the "Red Hat Certified Professional (RHCP) of the Year" promotion. Every administrator who holds a valid certification can apply - valid …

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If you want to have a short overview about which files of installed RPM packages has been altered, you probably don't want to deal with AIDE - a short script should be enough: 1#!/bin/sh 2for i in $(rpm -qa|tr "n" " ") 3do 4 RESULT="$(rpm -vV $i)" 5 if [ "$?" != "0" ]; then 6 …

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Especially on new installed systems it is possible that the manpage database wasn't initialized, yet. You can identify this if whatis / man -k doesn't "find anything": 1# man -k man 2man: nothing appropriate Under HP-UX the index is created using the following command: 1# catman -m Under RHEL there is a tool …

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