If you're running a PostgreSQL database on a CentOS/RHEL system and moved the data directory to a dedicated partition the following error might occur if you want to monitor the filling level using the Nagios/Icinga plugin check_disk: 1DISK CRITICAL - /var/lib/pgsql/data is not accessible: Permission denied The reason …

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If you want to always use the most recent Flash version around with Red Hat Enterprise Desktop (RHED) you'll probably use the Adobe YUM repository. If you're also receiving packages from the RHN channel "RHEL x86_64 Workstation Supplementary" further complications are possible because this channel also offers …

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If you want to list all installed Perl modules - e.g. to make sure all requirements of a Perl application are provided - pmall might help you a lot. On Red Hat Enteprise Linux/CentOS systems the tool is part of the perl-pmtools package and creates an output like below: 1# yum install -y perl-pmtools 2# pmall 3Newt …

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If you want to create a screenshot of your HP-UX system and don't have GIMP installed, you can easily create a X dump using the xwd commandos. This X dump can be converted into a JPG file (or some other picture format) on another machine using XnView. After executing the xwd command simply click on the window for the …

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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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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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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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Sometimes it might be necessary to mount Linux file systems under Windows. This can be done very easily using a tool named "DiskInternals Linux Reader". This tool is able to mount the following file system types in read-only mode: ext2/3/4 reiserFS/reiser4 HFS(+) UFS2 Be noticed that the tool only mounts …

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There are plenty of changes that have to be made after a fresh HP-UX 11i v1/v2 installation because of missing pre-configuration. For example: Name resolution By default, the file /etc/nsswitch.conf doesn't exist and has to be created and modified using a template. If this isn't done, neither XF86 nor the sw utility …

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Depending on SSH client configuration and HP-UX release it is possible that the backspace control key (which is used for deleting erroneous inputs) is not working as expected. 1# mn^?^?man 2mn^?^?man: command not found A possibility is to modify the configuraton of PuTTy - but this requires resetting the current …

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