Question : Execution of xclock command triggers with the error 'Missing charsets in String to FontSet conversion'. # xclock Warning: Missing charsets in String to FontSet conversion Warning: Unable to load any usable fontset Solution: This happens due to the incorrect setting for locale environment variable LC_ALL. In most cases, if you check the users locale variables using the below command you would fine that the varibale LC_ALL is empty. # locale | grep LC_ALL LC_ALL= Follow … [Read more...] about “Warning: Missing charsets in String to FontSet conversion” – how to resolve the xclock warning message
Archives for August 2017
CentOS / RHEL : How to install a specific version of rpm package using YUM
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 in as root. 1. clean the yum cache directory # yum clean all 2. To install a specific version of a package we must know the available package version in our repository. List … [Read more...] about CentOS / RHEL : How to install a specific version of rpm package using YUM
CentOS / RHEL : How to remove unused Physical Volume(PV) from Volume Group (VG) in LVM
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 a volume group, you can make sure that the physical volume is not used by any logical volumes by using the pvdisplay command. # pvdisplay /dev/sdb1 -m --- Physical volume --- PV Name … [Read more...] about CentOS / RHEL : How to remove unused Physical Volume(PV) from Volume Group (VG) in LVM
CentOS / RHEL : How to find kernel parameters used while booting
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 used while booting the kernel. The … [Read more...] about CentOS / RHEL : How to find kernel parameters used while booting
CentOS / RHEL : How to convert volume group metadata between LVM1 and LVM2
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 backup the metadata of current system, just copy the files contained in /etc/lvm/backup to another place. Volume group metadata can be converted from LVM1 to … [Read more...] about CentOS / RHEL : How to convert volume group metadata between LVM1 and LVM2
CentOS / RHEL : How to find free space in a Volume Group in LVM
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 the total size of the VG and free space directly. # vgdisplay -v vg_os2 | grep Free Using volume group(s) on command line. Free PE / Size 40672 / 158.88 GiB Total PE / Free PE 143072 / 40672 In … [Read more...] about CentOS / RHEL : How to find free space in a Volume Group in LVM