Linux

Add swap file in linux

Procedure to add a swap file

 1.You need to use dd command to create swapfile. Next you need to use mkswap command to set up a Linux swap area on a device or in a file.

  Login as the root user

 2. Type following command to create 512MB swap file (1024 * 512MB = 524288 block size):
 # dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

 3. Set up a Linux swap area:
# mkswap /swapfile1

 4. Activate /swapfile1 swap space immediately:
# swapon /swapfile1

 5. To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using text editor such as vi:
# vi /etc/fstab

Append following line:

/swapfile1 swap swap defaults 0 0

So next time Linux comes up after reboot, it enables the new swap file for you automatically.

 6.verify swap is activated .Simply use free command:
$ free -m

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