How do I play video cd under Linux operating systems? How do I play .dat file under Linux?
[continue reading…]
howto
[continue reading…]
How do I restart Apache web server under UNIX operating systems using command line or over the ssh session?
[continue reading…]
This is a user contributed FAQ.
Q. I’m just starting in vim text editor but I’m annoying typing and retyping similar statements. Can you address me about it?
[continue reading…]
This is a user contributed FAQ.
Q. Can you tell me few useful vim text editor keyboard short cuts for moving around while editing text files?
[continue reading…]
Q. How do I setup cacth-all email accounts under Postfix MTA? For example if an email send to me@domain.com, info@you.com and sales@you.com, should be sent to the same email address.
This is useful if anyone of user mistypes an email address when they send it to me, or just guesses at a valid email address, then they will likely get an error message from my server such as user / email mail box does not exist. So I wish to set up a “catch all” address
A. Mapping is done using /etc/postfix/virtual file.
# vi /etc/postfix/virtual
Append code as follows, replacing domain and emailusername with actual values:
@yourdomain.com emailusername
Save and close the file. Run following command:
# postmap /etc/postfix/virtual
Also make sure you have following line in /etc/postfix/main.cf file:
virtual_alias_maps = hash:/etc/postfix/virtual
If you just added above, line reload postfix:
# service postfix reload
Caution: if you set up a catch-all email address, you will likely receive more unsolicited (spam) email.
Q. I have two disk-mirrored array, suppose if one of my disk in mirrored RAID array fails, then I will replace that disk with new one (I have hot swapping SCSI drives). Now question is how I rebuild a RAID array after a disk fails.
A. A redundant array of inexpensive disks, (redundant array of independent disks) is a system, which uses multiple hard drives to share or replicate data among the drives. You can use both IDE and SCSI disk for mirroring.
If you are not using hot swapping drives then you need to shutdown server. Once hard disk has been replaced to system, you need to use used raidhotadd to add disks from RAID-1, -4 and -5 arrays, while they are active.
Assuming that new SCSI disk is /dev/sdb, type the following command:# raidhotadd /dev/mdX /dev/sdbReplace /dev/mdX with actual raid device name (e.g. /dev/md0). While array is under construction, you can see progress and other information by typing following command:# cat /proc/mdstat
See also:
- Surviving a Linux Filesystem Failures
- Above two commands are more than sufficient to solve your problem. However, I recommend reading The Software-RAID HOWTO for more information.
Sign up for my newsletter
