cat /etc/redhat-release for the CentOS version.
$ cat /etc/redhat-release
CentOS release 5 (Final)
*/check OS-bit
$ uname -a
Linux slave.DNS-HCM 2.6.9-42.ELsmp #1 SMP Tue Aug 15 10:35:26 BST 2006 x86_64 x86_64 x86_64 GNU/Linux
(64-bit)
# uname -a
Linux voice.localdomain 2.6.18-128.1.10.el5 #1 SMP Thu May 7 10:39:21 EDT 2009 i686 i686 i386 GNU/Linux
(32-bit)
"i686" means 32-bit. If it was 64-bit, it would be "x86_64"
*/service command - list running services
service --status-all
service --status-all | grep ntpd
service --status-all | less
*/Print the status of any service
To print the status of apache (httpd) service:
service httpd status
*/List all known services (configured via SysV)
chkconfig --list
*/List service and their open ports
netstat -tulpn
*/Turn on / off service
ntsysv
chkconfig service off
chkconfig service on
chkconfig httpd off
chkconfig ntpd on
*/check hardware information :
root@shell [~]# dmidecode | more
*/ check HDD
#df -h
*/ check Raid level
# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 hdc1[1] hda1[0]
104320 blocks [2/2] [UU]
md1 : active raid1 hdc2[1] hda2[0]
61633280 blocks [2/2] [UU]
md2 : active raid1 hdc3[1] hda3[0]
8193024 blocks [2/2] [UU]
md4 : active raid1 hdc6[1] hda6[0]
1020032 blocks [2/2] [UU]
md0 : active raid1 hdc5[1] hda5[0]
5116544 blocks [2/2] [UU]
unused devices:
In this scenario, it shows that md had raid 1 installed.
# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Thu Jun 28 16:43:40 2007
Raid Level : raid1
Array Size : 5116544 (4.88 GiB 5.24 GB)
Device Size : 5116544 (4.88 GiB 5.24 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Sep 15 18:43:06 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Number Major Minor RaidDevice State
0 3 5 0 active sync /dev/hda5
1 22 5 1 active sync /dev/hdc5
UUID : 506b9927:274e5bca:a1aa0988:48c7ded4
Events : 0.7769115
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