CentOS linux operating system.
When booting on a default installation of CentOS 7, after the grub boot loading menu displays the screen refreshes into a progress bar during the boot process. I’m used to seeing the detailed kernel output during the boot process to diagnose boot problems. So these are the steps to disable Read more…
We have a client with a multi-data center installation of Cassandra. While, I was in another one of our data centers working on a client cluster and attempting to run a rebuild and got a stream error. Cassandra server is running package cassandra30-3.0.9-1.noarch I ran the following command; nodetool -u Read more…
I just had a client recently ask, “Why doesn’t my secondary dns server update a zone?” They’re running pdns and poweradmin packages: poweradmin-2.1.4-1.el6.noarch pdns-4.0.3-1pdns.el6.x86_64 pdns-backend-mysql-4.0.3-1pdns.el6.x86_64 on both ns1 and ns2 servers. The ns2 server is set to be slave of ns1, so any changes made on ns1 automatically get populated Read more…
Today I got the error message: Error: Could not stat() command file ‘/var/spool/nagios/cmd/nagios.cmd’! The external command file may be missing, Nagios may not be running, and/or Nagios may not be checking external commands. An error occurred while attempting to commit your command for processing. I upgraded from Nagios Server 3.2.0 Read more…
This was a weird one for me. We had a client ask for a CentOS 7 installation, one of the other techs always installs CentoOS 6 to do a Dell firmware update then leaves it to install what the client requests. I went to install CentOS 7 and it wouldn’t Read more…
This is my blog, I’m a unix administrator that always come across things that I need to fix. My personal preference is CentOS. So most of the answers you find here will be centered around CentOS 6 or 7 and how to resolve them. You never can know everything, right Read more…
How do you reformat a SAS drive when when not in the data center? I’m sure you tried the same thing as me. I need to clean out a stack of old drives that got pulled from servers over the years and I have no idea what’s on them now. Read more…