Create a swap space using file in RHEL or Centos

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$ sudo dd if=/dev/zero of=/swapfile bs=1M count=1024  $ sudo mkswap /swapfile  $ sudo chmod 600 /swapfile  $ sudo swapon /swapfile  $ sudo vim /etc/fstab

Add this line to fstab:

swap        /swapfile   swap    defaults        0   0
​

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