Archives for August 2017

Question : How to install a specific rpm package version using yum? Answer : The ask here is to install a specific version of the package when multiple versions are available. By default when you do not specify a version for a package, latest version gets installed. The procedure below requires you to be logged […]

To remove any physical volume in a volume group vgreduce command can be used. The vgreduce command shrinks the volume group by removing one or more PVs. We can then either use these free PVS in another VG or remove them from the LVM configuration. Removing the PV 1. Before removing a physical volume from […]

The options and arguments supplied while booting RHEL/CentOS kernel can be viewed in the file /proc/cmdline. # cat /proc/cmdline ro root=/dev/mapper/vg_os-lv_os rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=131M@0M rd_LVM_LV=vg_os/lv_os KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet Comparing with the default boot parameters You can compare the /etc/grub.conf file with the /proc/cmdline file to see if the same options are […]

The volume group metadata contains all the configuration information about the VG. It can be used to recover a deleted or corrupted VG. By default, the system will backup LVM2 automatically when LVM2 metadata has been changed by lvm utility such as lvcreate or vgchange etc. The metadata backup is stored in /etc/lvm/backup directory. To […]

Knowing the free space remaining in a volume group is an important piece of information, especially when you want to : 1. add a new volume in the VG 2. add a new PV in the VG 3. extend an existing volume in the VG Method 1 – using vgs command vgs command simply puts […]

You can use the following command to display the install date and time of all the packages installed on your system: rpm -qa –last For example : # rpm -qa –last | more aide-0.14-11.el6.x86_64 Tue 22 Aug 2017 12:57:07 AM IST tzdata-java-2017b-1.el6.noarch Tue 22 Aug 2017 12:27:22 AM IST trace-cmd-2.2.4-4.el6.x86_64 Tue 22 Aug 2017 12:27:22 […]

The post describes steps to delete a volume group. Make sure you have unmounted and the mount points and taken prior backup of the mount point if required. 1. Once you have umounted all the mount points, you can remove the LVs associated with them. To do so use the lvremove command : # lvremove […]

Question: How to mount a Volume_Group/Logical Volume on a system that already has a volume group/logical volume mounted with the same Volume Group and Logical Volume Name. Below is the summary of steps to perform to import new volume group with same name as that of already imported VG. Backup the system. Get the relevant […]