Linux expand swap virtual memory

The memory of my linux machine is a bit small, but last time I only allocated 2G of memory to swap, I suddenly felt that it was not enough today

Then expand the 10G swap virtual memory

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1. First close the 2G swap memory in use:

swapoff /var/swap 

• /var/swapThe location of the swap virtual memory file for my machine, according to their respective conditions.
• If swap is not in use and execute this command, swap will be turned off immediately, if it is in use, it will wait for a while...

2.Delete the swap virtual memory file:

rm /var/swap

• Or according to the actual situation of the respective swap file location

3. Use the dd command to create a file:

dd if=/dev/zero of=/var/swap bs=1M count=10240

• The size is 1M*10240=10GB, allocate memory according to their respective conditions
• of is followed by the location where you need to create swap
• if no need to manage

4. Format the file just now as a swap file:

mkswap /var/swap

• If there is no formatting, an error will be reportedswapon: /var/swap: read swap header failed

5.Open the swap file:

swapon /var/swap  

• Followed by your swap file location

6. Set the system to automatically mount swap after booting

nano /etc/fstab

Add to/var/swap swap swap defaults 0 1

• If your swap file location is the same as last time, no need to modify
• If you change it, please delete the previous one and add it again

6.Check the swap situation:

free -m