How to find when Operating system was installed in linux CentOS and Red Hat
This is a short video to know how you can find out on which date the linux was installed.
It is applicable to Red Hat based linux distro.
Step 1 : First find out the basesystem rpm.
rpm -qa|grep basesystem
Step 2: Now copy the complete basesystem version no. and hit the below given command .
The output will show many info. See the “Install Date” , this is the date when OS was installed.
Note: This is applicable when you have done fresh installation without using any image. For eg. the case is not applicable if you are checking in VPS (Virtual Private Server).
Below given is another method which is sure shot case to case
Another method for finding Install Date of Linux Operating system (CentOS and Red Hat)
Here the logic is Linux OS is installed in / root partition. So we will see when the partition was created which is equivalent to when Linux was installed.
We will use tune2fs command
Step 1: First do “df -Th” to get info where the / is mounted. In below given example / is mounted in /dev/sda5 (In your Linux OS it would vary)
linux@tuxworld:/tmp$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda5 28G 25G 1.6G 95% / udev 2.0G 4.0K 2.0G 1% /dev tmpfs 796M 980K 795M 1% /run none 5.0M 0 5.0M 0% /run/lock none 2.0G 12M 2.0G 1% /run/shm none 100M 56K 100M 1% /run/user cgroup 2.0G 0 2.0G 0% /sys/fs/cgroup /dev/sda7 9.2G 8.9G 0 100% /partition7 /dev/sda8 46G 41G 3.1G 93% /partition8 /dev/sda9 74G 40G 31G 57% /partition9 linux@tuxworld:/tmp$
Step 2 : Use the command tune2fs.
tune2fs -l /dev/sda5
The below given is with grep command.
root@tuxworld:~# tune2fs -l /dev/sda5 |grep 'Filesystem created' Filesystem created: Sat Feb 18 22:47:25 2012 root@tuxworld:~#
Here “Sat Feb 18 22:47:25 2012” is OS installation date