Linux « VICOSYS

Archive for the ‘Linux’ Category

Extending a Logical Volume

Sunday, July 17th, 2011

There are two steps to extend a logical volume.

1. To Extend the logical volume

lvextend -L+1G /dev/VolGroup00/LogVol06

2. To Expand the File System

resize2fs /dev/VolGroup00/LogVol06

To Display how much un-assigned Volume Group

vgdisplay

— Volume group —
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 7
Open LV 7
Max PV 0
Cur PV 1
Act PV 1
VG Size 232.50 GB
PE Size 32.00 MB
Total PE 7440
Alloc PE / Size 3934 / 122.94 GB
Free PE / Size 3506 / 109.56 GB
VG UUID lXSKxs-552n-VZ03-NsYv-c3qV-FZ3W-ONeIGD

Posted in Linux | No Comments »

NFS Client Failed

Thursday, July 14th, 2011

If you are trying to mount a nfs volume and failed, check the following service is running.

service portmap start

Posted in Linux | No Comments »

Compiling PHP with mysql support on x64 platform

Tuesday, July 12th, 2011

In order to compile PHP on a 64 bit platform, you will need to include the following configure option
–with-libdir=lib64

Posted in Apache, Linux, MySQL, PHP | No Comments »

Install Development Packages on Centos

Tuesday, April 26th, 2011

yum groupinstall ‘Development Tools’

Posted in Linux | No Comments »

Search and Replace in VI

Saturday, September 18th, 2010

To Search and Replace in VI.

:%s/search_string/replacement_string/g

% is equal to all lines in a file
g is equal to global. Replace all occurrence of the search result.

Posted in Linux | No Comments »

Finding out the process is occupying the Network Port on Windows and Linux

Tuesday, August 3rd, 2010

You ever have a problem trying to start an application and it failed to start because the network port was occupied by another application? To find out the application that using the port is painstaking. The following commands could help you.

In the following example, I am trying to find what is the process that is occupying the port 8080.

Windows

C:\Documents and Settings\terence>netstat -aon | findstr 8080
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 1748

C:\Documents and Settings\terence>tasklist | findstr 1748
TNSLSNR.EXE 1748 Console 0 6,264 K

Linux

[root@mail03a ~]# netstat -nap | grep 8080 | grep LISTEN
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 2685/openvpn

Posted in Linux, Networking, Windows | No Comments »

Loading a Text File Line by Line in a Bash Shell

Thursday, May 13th, 2010

The following example demonstrates how to load a text file into array in a Bash Shell.

#!/bin/sh count=0 while read line do ARR[$count]=$line ((count++)) done < /tmp/infile for LINE in ${ARR[*]} do echo $LINE done

Posted in Bash, Linux | No Comments »

Auto close a SSH session after a period of idle activities

Tuesday, January 26th, 2010

to automatically close a SSH connection on the server, we can change the following ssh configuration.

Edit /etc/ssh/sshd_config

Change
ClientAliveInterval 300
ClientAliveCountMax 3

service sshd restart

Posted in Linux | Comments Closed

Mounting filesystem with noatime to improve performance

Sunday, August 30th, 2009

atime is to record the last access time of a file in a Linux Filesystem. In a busy system, this could be a heavy tax in a busy system. People reported 5% to 20% performance gain bbut your milage may varies.

To disable the record of the atime.

vi /etc/fstab
/dev/VolGroup00/LogVol04 /usr/local/mysql/var ext3 rw,noatime 1 2

Remount the filesystem to take effect of the update
mount -o remount /usr/local/mysql/var

Check the mount options
[root@mail01a ~]# mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
/dev/mapper/VolGroup00-LogVol05 on /home type ext3 (rw)
/dev/mapper/VolGroup00-LogVol03 on /usr type ext3 (rw)
/dev/mapper/VolGroup00-LogVol04 on /usr/local/mysql/var type ext3 (rw,noatime)
/dev/mapper/VolGroup00-LogVol02 on /var type ext3 (rw)

Posted in Linux | Comments Closed

NFS Automount

Monday, May 25th, 2009

1. on the server – Create a mount point

mkdir /mnt/shared

2. on the server – edit /etc/exports

/mnt/shared 192.168.100.20(rw,anonuid=12345,anongid=12345)

exportfs -a

3. on the client – edit /etc/fstab

192.168.100.20:/volume1/shared /mnt/shared nfs rsize=8192,wsize=8192,soft,intr 0 0

The extra rsize and wsize parameter would improve r/w performance

4. on the client –

mount /mnt/shared

Posted in Linux | Comments Closed

VICOSYS

Archive for the ‘Linux’ Category

Extending a Logical Volume

NFS Client Failed

Compiling PHP with mysql support on x64 platform

Install Development Packages on Centos

Search and Replace in VI

Finding out the process is occupying the Network Port on Windows and Linux

Loading a Text File Line by Line in a Bash Shell

Auto close a SSH session after a period of idle activities

Mounting filesystem with noatime to improve performance

NFS Automount

Categories

Archives

Meta