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Red Hat Enterprise Linux 6 to 7? Migrating existing Red Hat Enterprise Linux installations to new major versions Migration vs. Upgrade •migration: Moving a set of running services from one installed system to another, including all configuration aspects and data. •upgrade: Upgrading the installed software to newer revisions. This process may or may not include […] Linux cluster commands Checking status of the cluster: # clustat # clustat -m Display status of and exit # clustat -s Display status of and exit # clustat -l Use long format for services # cman_tool status Show local record of cluster status # cman_tool nodes Show local record of cluster nodes # cman_tool nodes […] Why we give swap partition in double the size of the RAM? It has a meaning and for that we should know memory hierarchy. We have different levels of memory which is useful for processing your data. They are as follows. Processor/CPU registers(Bits in size) L1 Cache(kbs in size) L2 Cache(MBs in size) L3 cache(100s […] * Example use of dd command to create an ISO disk image from a CD-ROM: dd if=/dev/cdrom of=/home/sam/myCD.iso bs=2048 conv=sync *Using dd to wipe an entire disk with random data: dd if=/dev/urandom of=/dev/hda *Using dd to clone a hard disk to another hard disk: dd if=/dev/ad0 of=/dev/ad1 bs=1M conv=noerror *Duplicate a disk partition as a […] SYSTEM Hardware | Statistics | Users | Limits | Runlevels | root password | Compile kernel | Repair grub | Misc Running kernel and system information # uname -a # Get the kernel version (and BSD version) # lsb_release -a # Full release info of any LSB distribution # cat /etc/SuSE-release # Get SuSE version […] EXT3-fs error (device hda3) in start_transaction: Journal has aborted If your system abruptly loses power, or if a RAID card is beginning to fail, you might see an ominous message like this within your logs: EXT3-fs error (device hda3) in start_transaction: Journal has aborted Basically, the system is telling you that […] lv_root: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY *** An error occured during hte file system check *** Dropping you to a shell;the system will reboot *** when you leave the shell. Give root password for maintenance (or type Control-D to continue): now what? First of all i would not worry to much about this error, […] [gview file=”http://rmohan.com/wp-content/uploads/2014/06/SHARE-Anaheim-2014-v3.pdf”] cat /proc/sys/fs/file-max 589420 The output tells us it is set to 589420. The vendor asked for this to be increased to 1639200. We can add change the value immediately by executing: # sysctl -w fs.file-max=1639200 To make this a permanent setting applied everytime the system reboots an edit of /etc/sysctl.conf file is required. Add: fs.file-max […] lang en_GB.UTF-8 keyboard us timezone Europe/Brussels –isUtc auth –useshadow –enablemd5 selinux –enforcing firewall –enabled –service=mdns xconfig –startxonboot part / –size 8192 –fstype ext4 services –enabled=NetworkManager –disabled=network,sshd # Root password rootpw –iscrypted $6$K2nKf02kVKG68960$OywvoaViphSITuro/liKvCj7Pm/CH/xqzz/lsoXyaKSR1lYf0vHAqSUc483a9MCCBkIwfr/hNMfqwxqVO0OEg1 repo –name=base –baseurl=http://ftp.redhat.com/redhat/rhel/rc/7/Client/x86_64/os/ %packages @base @core @fonts @gnome-desktop @input-methods @x11 #Live install tools anaconda system-config-keyboard grub2 firefox #Packages to remove for space […] |
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