Osbn-Ubuntuusers

Short tip: List all installed Perl modules

Nov 11, 2013 · 1 min read · kurztipp ·

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 ( …

Use OMD with ssmtp

Nov 7, 2013 · 2 min read · omd ·

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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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Assign recent errata automatically to Spacewalk

Nov 4, 2013 · 3 min read · red-hat-satellite spacewalk suse-manager ·

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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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OSAD SSLError troubleshooting

Nov 3, 2013 · 3 min read · red-hat-satellite spacewalk suse-manager ·

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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 …

5 recommended OwnCloud plugins

Oct 31, 2013 · 3 min read ·

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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 …
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Install OwnCloud on a managed web server

Oct 30, 2013 · 3 min read ·

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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: …

Syncing contacts and calendars using Baikal on your own web server

Oct 28, 2013 · 5 min read ·

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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 …

Call "HostDatastoreSystem.QueryVmfsDatastoreCreateOptions" for object "ha-datastoresystem" on ESXi "xxx.xxx.xxx.xx" failed.

Oct 18, 2013 · 2 min read · esxi ·

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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 …

Short tip: Disable IPv6 completely under RHEL / CentOS

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 …

Persistent txqueuelen network parameter using udev

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 …