It is possible that a VM is not responding any more - mostly it's a simple solution to restart the appropriate VM. Under rare circumstances it is possible that this restart process isn't passing through. An indicator for this issue is that the process (which normally only takes a couple of seconds) needs multiple …

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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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After some time old packages are accumulated in software channels managed by Spacewalk, Red Hat Satellite or SUSE Manager. Especially at least when your hard drive are threaten to get tanked up you should clean up and remove unneeded packages. For this there is a utility called spacewalk-data-fsck - but this tool only …

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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 a package …

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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 use Open Monitoring Distribution (OMD) and don't want to setup a full-fledged Postfix or Sendmail service (e.g. because it is a test system) you might want to have a look at the alternative tool ssmtp for relaying mails to an external mail server. The tool is only recommend if you don't need any local mail …

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Recent bugs and security issue are mapped to necessary updates in the form of errata. Users of the commercial Red Hat Satellite or SUSE Manager server get these information directly from their distributor. Using Spacewalk this needs to be done manually - fortunately there a script CEFS by Steve Meier which automates …

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If problems occur while starting the Open Source Architecture Daemons the issue can have multiple problem causes. This service is used amongst others in combination with Spacewalk, Red Hat Satellite, or SUSE Manager to push configuration jobs or software packages. The following problem causes are possible: The firewall …

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There are plenty of "apps" for OwnCloud which are expanding the functional range of the open-source software. Currently at about 110 such addons are available for free download. Some of these addons can be installed directly using the "Apps" menu in the administration interface of OwnCloud - some addons require manual …

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When it is necessary to share files between multiple devices and persons OwnCloud is a good alternative for Dropbox. The open-source software that also supports WebDAV can also be installed on a managed web server - for this purpose the project offers a installation script which is transfered to the server using FTP: …

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