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Steps to create swap file on Centos Server

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  • Steps to create swap file on Centos Server

    Can you please guide me through the steps to create swap file on Centos Server?


  • #2
    Hi Neha,

    Here, I'll consider that you need to create a Swap space of 4 GB as as a reference and you may follow below steps to do so.

    Connect to the server as root user.

    1. Check total disk space available on the server

    Code:
    df -h
    2. Manipulate File space. Create a swapfile in the location where it can't be deleted. I've considered /root location for the same.

    Code:
    fallocate -l 4G /root/4GB.swap
    3. Use following command, the count parameter will be used to allocate the desired block size 4 GB.

    Code:
    dd if=/dev/zero of=/root/4GB.swap bs=1024 count=4048576
    4. Create a swap file.

    Code:
    mkswap /root/4GB.swap
    5. Change the permission to 600.

    Code:
    chmod 600 /root/4GB.swap
    6. To enable Swap immediately and not on boot time.

    Code:
    swapon /root/4GB.swap
    7. To enable swap at boot time add an entry to /etc/fstab file

    Code:
    vi /etc/fstab
    Code:
    /root/4GB.swap  swap  swap  defaults 0  0
    8. To check the mount or entry is correct.

    Code:
    mount -a
    9. Swap is now available and can be checked using below command.
    Code:
    free -m

    Comment


    • #3
      Thanks great information on how to create swap space.

      Comment


      • #4
        You're welcome !!
        Last edited by Mandeep; 02-11-2018, 12:38 PM.

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