Linux

This post briefly outlines how it possible to re-create the yum cache, or said in another way, force a fetch of the cache data from the enabled yum repositories. The enabled yum repositories are the ones in the following file /etc/yum.conf or in the following folder /etc/yum.repos.d that have their "enabled" setting to "1", e.g. : [public_ol6_latest] name=Oracle Linux $releasever Latest … [Read more...] about How to Re-Create the Yum Cache and/or Force a Fetch of the Package List of the Enabled Repositories

This is required when there is no RAID controller card available for the server and the only solution is software RAID. This post makes changes to partitions, so if there is any existing data on any disks being used for this purpose, it should be backed up prior to creating the RAID array as per standard best practices. 1. In order to mirror the disk, information about partition has to be obtained. This can be done with one of the following commands: # parted /dev/sda u s p # fdisk -l … [Read more...] about How to Mirror Swap, Boot and Root Partions in CentOS/RHEL 7 Using mdadm Utility

If the Linux server has device-mapper-multipath configured, you can run 'multipath -ll' to list how disks are grouped together. For ALUA mode, you can check if a disk is in the Active/Optimized or non-optimized group. This post, however, is to discuss how to use sg_rtpg command to check the target port group asymmetric access state (aas). Along with sg_inq command, you can check if a specific disk (/dev/sdX) is in Active/optimized group or not. You can use sg_rtpg to decode the status code … [Read more...] about How to Verify a Lun is in Active/Optimized Mode when ALUA Is Configured on Storage

A yum repository holds the rpms and metadata about the rpms. A yum repository must be configured in order to use yum on any yum based Linux system. This post provides steps to configure a yum repository for installing packages on CentOS/RHEL systems. Configuring yum repository server 1. Create a directory for you local repository, e.g. /home/mypackage_dir/repository. Move the RPMs into that directory. # cp /media/packages/* /home/mypackage_dir/repo 2. Fix some ownership and filesystem … [Read more...] about How to Create Yum Repository For System Packages Installation in CentOS/RHEL

The Problem When adding an extra repository of the public yum into existing yum repository configuration file, the following errors are shown: # yum repolist Loaded plugins: langpacks, ulninfo File contains parsing errors: file:///etc/yum.repos.d/public-yum-ol7.repo [line 91]: name=Latest Unbreakable Enterprise Kernel Release 4 for Oracle Linux 7Server (x86_64) [line 92]: baseurl=https://yum.oracle.com/repo/OracleLinux/OL7/UEKR4/x86_64/ [line 93]: … [Read more...] about Getting “parsing errors” When Running ‘yum repolist’