CentOS/RHEL 5

How to enable additional scsi logging in CentOS/RHEL
Question: How to turn on scsi extended debug messages? What are the field/flag definitions of scsi_logging_level? Additional scsi logging messages can...
How to Disable rpc.quotad Service in CentOS/RHEL 6 and 7
This post explains how to disable rpc.quotad service on CentOS/RHEL 6 or 7 machines. The protocol used by rpc.rquotad is an unsecured and obsolete pro...
How to configure Linux Resource Groups (cgroups) for MySQL
The following provides the procedure for configuring and using resource groups under Linux: 1. To use cgroups, you must install the “libcgroup” packag...
What are “segfault” messages in /var/log/messages file
This post explains how to analyse the segfault message in message file and to identify the problem in application or operating system side. What is “s...
rpm error while loading shared libraries invalid ELF header
The Problem rpm commands issue the following error: rpm: error while loading shared libraries: /usr/lib64/liblzma.so.0: invalid ELF header The Solut...
How to Create yum Repository in CentOS/RHEL
1. Create a directory for you local repository, e.g. /home/mypackage_dir/repository. Move the RPMs into that directory. # mkdir /home/mypackage_dir/r...
CentOS/RHEL - vgs command reports error “global/global_filter” unknown
The Problem The user has set a new value for the parameter global_filter in the /etc/lvm/lvm.conf file. After setting the parameter value 'vgs' comman...
'nestat -s' showing a large number for “packet reassembles failed” errors in CentOS/RHEL
The Problem System exhibits some performance degradation. Checking with netstat shows very large (and rising) numbers of “packet reassembles failed” s...
“Could not resolve proxy https; Unknown error” - error with 'yum update'
The Problem While executing: # yum update The following error occurs: One of the configured repositories failed (Unknown), and yum doesn't have eno...