Monitoring remote hosts with Nagios can be done with various methods, ranging from snmp, ssh, nrpe, of a custom solution. To monitor some ‘black-box’ appliances with a very minimal OS-environment it wasn’t possible to install/run the NRPE agent. Since I seem to be using more and more passive nagios checks with the nagios service check . . . → Read More: A simple NRPE alternative, based on bash, cron and NSCA
I’ve updated the following packages in my centos6 repository
ImageMagick 6.7.8-6 Cairo 1.12.2-1 Pixman 0.22.0 Poppler 0.12.4
Repodata files should now also be present, for easy in installation and upgrading.
Updates 2012/09/18: Some more packages can be found in the repository:
poppler20-0.20.3 (new package-name to avoid conflicts with poppler 0.12 in EL6) sox-14.3 (with mp3 . . . → Read More: New packages in the CentOS/RHEL 6.x repo
So, this weekend was quite an interesting one, as on July 1st 02:00 local time (00:00 UTC) a leap-second was added via NTP. This caused serious problems for all my Java Virtual Machines and mysql databases.
If your system has printed the following line (in dmesg), a leap-second has been added recently: Clock: inserting leap . . . → Read More: Linux Leap-Second problem
I’ve recently written two new check-scripts for ActiveMQ. These nagios scripts will keep an eye out on ActiveMQ’s internal storage space and status of the queues.
Both scripts make use of activemq’s administrative web-interface (located at hostname:port/admin/ by default).
Check_ActiveMQ_Mem Usage: check_activemq_mem url warn crit
The url to use is the ‘print’ version, as that’s . . . → Read More: 2 new ActiveMQ monitoring scripts for Nagios (compatible monitoring systems)
Today I was greeted with a failed drive in a mdadm raid array. The drive had some transient errors and was kicked out of the array, but testing showed that the drive still seemed to work just fine.
The following procedure will remove the drive from the array, remove it from the system, . . . → Read More: Resetting failed drive in linux mdadm raid array
In my centos6 repository you can now find ‘up-to-date’ packages for ImageMagick compiled with Google’s new webp image format support. These packages were built on a centos6 build-host, as the packages from the ImageMagick project, which are built on CentOS 5.7 are not really compatible with CentOS 6.x.
. . . → Read More: ImageMagick 6.7.6 and libwebp 0.1.3 packages for CentOS/RHEL 6.2
My customers have a rather large hunger for storage-capacity, but not the budgets to buy expensive SAN networks or NAS-heads. This post will describe a low-cost, high capacity storage platform that should be able to provide decent performance at a cost of about 110 euro per TB usable capacity (given raid-6, with 6+2 disks per . . . → Read More: Designing a low-cost, high-capacity storage server
In Linux (with kernels >= 2.6.32) you can modify resource-limits (ulimit) run-time. This can be done using the /proc/<pid>/limits functionality. On older kernels this file is read-only and can be used to inspect the limits that are in effect on the process. On newer systems you can modify the limits with echo:
cat /proc/pid/limits echo . . . → Read More: Run-time editing of limits in Linux
Sig-I/O is currently working on an off-site backup service for it’s customers. We will offer secure off-site backup capacity in a different datacenter from our main operations. Customers will be able to rent backup space on a quarterly basis, from 1 gigabyte up to several terabytes.
More information will be released soon. Please contact us . . . → Read More: Offsite backups
Some images from the visit to the 2011 Autorai.