Osbn-Ubuntuusers

Use IOmeter under Linux

Oct 1, 2015 · 3 min read ·

IOmeter is a collection of tools for running detailed IO benchmarks. It is often used as the tool is able to reproduce the characteristics of current applications and services. IOmeter consists of a management software that manages and evaluates the particular tests and Dynamo - an executable that run these tests in …
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Errorenous Oracle Instantclient RPM provides under Enterprise Linux

Jul 22, 2015 · 2 min read · fail oracle ·

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If you are using drivers and libraries that need access to Oracle databases (e.g. perl-DBD-Oracle), you will need the Oracle Instantclient. Oracle offers this software for free after registration. Unfortunately creating correct provides tags was missed when creating the RPM packages. Even though Instantclient is …
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Distribute GitLab Community Edition with Spacewalk

Jun 13, 2015 · 3 min read · gitlab red-hat-satellite spacewalk suse-manager ·

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GitLab is a very popular alternative to GitHub that is available as free Community Edition for interested hobbyists and smaller companies. For installing the software, there is a script for downloading and installing the particular software packages. If you have a look at the source code of this script, you will see …
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Short tip: DRBD + EL7: /var/lib/drbd/drbd-minor-0.lkbd: No such file or directory

May 13, 2015 · 1 min read · kurztipp ·

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Recently I stumbled upon the following error message while creating a DRBD volume on CentOS 7:

1# drbdadm create-md r0
2initializing activity log
3NOT initializing bitmap
4Writing meta data...
5lk_bdev_save(/var/lib/drbd/drbd-minor-0.lkbd) failed: No such file or directory
6New drbd meta data block successfully created …

Short tip: Please reserve memory by passing 'crashkernel=X@Y' parameter to the kernel

Apr 29, 2015 · 1 min read · kurztipp ·

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While configuring kdump on a system I recently stumbled upon the following error:

1Please reserve memory by passing "crashkernel=X@Y" parameter to the kernel

However, the parameter crashkernel was mentioned in the GRUB configuration file and kernel commandline:

1$ grep crashkernel /proc/cmdline
2ro …

Store kernel dumps using kdump on remote machines

Apr 28, 2015 · 3 min read ·

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If the Linux kernel crashes it is possible to create a memory image (also called vmcore) using a mechanism called kdump. Especially, this is useful if you plan to engage support to fix the reason for the issue. By default, the vmcore is stored under /var/crash. But if the kernel is not able to access the storage …
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Spacewalk 2.3 released

Apr 16, 2015 · 2 min read · red-hat-satellite spacewalk suse-manager ·

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After Red Hat Satellite 5.7 was released 3 months ago Spacewalk version 2.3 was published on 14th of april 2015 after 9 months of development. Like the commercial spin-off the recent management suite also offers a more modern web-interface. With version 2.2 this interface's user experience was overhauled by HTML5, …
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Short tip: Monitor Koukaam NETIO PDUs with Nagios / Icinga

Mar 8, 2015 · 1 min read · icinga nagios netio kurztipp ·

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Koukaam NETIO power outlets offer a network interface that can be used for controlling the particular ports comfortably. It would be even nicer to monitor them with Nagios or Icinga. 2012 I created a provisional bash script for monitoring the ports and time synchronization over NTP.

This weekend I migrated the script …

Short tip: PostgreSQL error "SQLSTATE[08006] [7] FATAL: Ident authentication failed"

Feb 15, 2015 · 2 min read · kurztipp ·

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While testing a web application that uses PHP PDO to establish a connection to a PostgreSQL database I stumbled upon the following error message:

1Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[08006] [7] FATAL: Ident authentication failed for user "user"' in xxx.php …

Oracle XE: reset locked users

Feb 13, 2015 · 2 min read · oracle ·

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If you haven't used an Oracle database for some time you might stumble upon the issue I just had: all internal user accounts were locked and I also didn't know the passwords.

By default login information of internal users are invalid after 180 days.

The following accounts are important to me on my Oracle 11gR2 Database …