To add 4Gig Swap:
- dd if=/dev/zero of=/swapfile bs=1M count=4048
- mkswap /swapfile
- chmod 600 /swapfile
- vi /etc/fstab
Add: /swapfile swap swap 0 0
- mount -a
- swapon -a
- swapon -s
- free -m
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- Add swap file CentOS