How to increase the size of /tmp partition in Linux?

Proceed with the given steps:-
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1)Stop MySql service and process kill the tailwatchd process.

[root@localhost ~]# /etc/init.d/mysqld stop
Stopping MySQL: [ OK ]
[root@localhost ~]#pstree -p | grep tailwatchd
Find the tailwatchd process id and kill it
[root@localhost ~]# kill -9 2522

2)Take a backup of /tmp as /tmp.bak
[root@localhost ~]#cp -prf /tmp /tmp.bak

3)Create a 2GB file in the avaliable freespace

==============================
[root@localhost dev]# dd if=/dev/zero of=/usr/tmpDSK bs=1024k count=2048
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 73.6908 seconds, 29.1 MB/s
==============================

[root@localhost dev]# du -sch /usr/tmpDSK
2.1G /usr/tmpDSK
2.1G total

4)Assign ext3 filesystem to the file
====================================
[root@localhost dev]# mkfs -t ext3 /usr/tmpDSK
mke2fs 1.39 (29-May-2006)
/usr/tmpDSK is not a block special device.
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
262144 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
First data block=0
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
====================================
5) Check the file system type:-

[root@localhost dev]# file /usr/tmpDSK

/usr/tmpDSK: Linux rev 1.0 ext3 filesystem data (large files)
Note:-
=====
You may also use the following comands for making ext3 file system on a file:
[root@localhost dev]#mkfs.ext3 /usr/tmpDSK
[root@localhost dev]#mke2fs /usr/tmpDSK

6)Unmount /tmp partition

[root@localhost dev]#umount /tmp

7))Mount the new /tmp filesystem with noexec

[root@localhost dev]#mount -o loop,noexec,nosuid,rw /usr/tmpDSK /tmp

8) Set the correct permission for /tmp

[root@localhost dev]# install -d –mode=1777 /tmp
[root@localhost dev]# ls -ld /tmp
drwxrwxrwt 3 root root 4096 Feb 6 08:42 /tmp
( you may use the command chmod 1777 /tmp for doing the same )
==========================

[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda9 28G 6.4G 20G 25% /
/dev/sda8 99M 10M 84M 11% /boot
tmpfs 500M 0 500M 0% /dev/shm
/usr/tmpDSK 2.0G 68M 1.9G 4% /tmp
==========================
7)Restore the content of old /tmp.bkp directory

[root@localhost dev]# cp -rpf /tmp.bak/* /tmp

8) Restart the mysql and tailwathchd services.

[root@localhost dev]# /etc/init.d/mysql start
[root@localhost dev]# /scripts/restartsrv_tailwatchd

9)Edit the fstab and replace /tmp entry line with :-
=========================================
/usr/tmpDSK /tmp ext3 loop,noexec,nosuid,rw 0 0=========================================
10) Mount all filesystems

[root@localhost dev]#mount -a

Check it now:-
============================
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda9 28G 6.4G 20G 25% /
/dev/sda8 99M 10M 84M 11% /boot
tmpfs 500M 0 500M 0% /dev/shm
/usr/tmpDSK 2.0G 68M 1.9G 4% /tmp
============================
Done.