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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To keep contacts and calendars up-to-date between multiple devices well-known cloud services like Apple iCloud or the Google services are often used. It's no doubt that this is a very comfortable solution - but in my opinion you shouldn't place trust in public cloud services. I personally avoid cloud services and try …

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While creating a VMFS storage I received the following error yesterday: 1Call "HostDatastoreSystem.QueryVmfsDatastoreCreateOptions" for object "ha-datastoresystem" on ESXi "xxx.xxx.xxx.xx" failed. First I thought the freshly created logical drive on my HP RAID contorller had a failure - but this drive was working …

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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 still open …

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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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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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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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OpenVPN Connect is a good OpenVPN client for iOS devices with version 5.0 or higher. Using this app VPN tunnels can be managed and used comfortably. Unfortunately the respective OpenVPN configuration files can't be edited directly on the iPhone, iPod or iPad like in the Android application. The first setup might be …

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