How to set up swap partition SWAP in Linux 7.7

The Swap partition of the Linux system, that is, the swap partition, is also commonly called virtual memory. The role of the Swap space can be simply described as: when the system's physical memory is insufficient, it is necessary to release part of the physical memory for use by the currently running program. The released space may come from some programs that have not been operated for a long time. The released space is temporarily saved in the Swap space. When those programs are to be run, the saved data is restored from the Swap to the memory. In this way, the system will only perform swap when the physical memory is insufficient. In fact, Swap adjustment is crucial to the performance of Linux servers, especially Web servers. By adjusting Swap, you can sometimes overcome system performance bottlenecks and save system upgrade costs.

1. Create a swap partition file

[root@devsz wxadmin]# dd if=/dev/zero of=/opt/swapfile bs=1M count=4096 
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB) copied, 20.789 s, 207 MB/s

2. Authorize the file

[root@devsz wxadmin]# chmod 600 /opt/swapfile

3. Format the swap partition

[root@devsz wxadmin]# mkswap /opt/swapfile 
Setting up swapspace version 1, size = 4194300 KiB
no label, UUID=bfe83644-0fa0-43f9-bf7e-69f9e24b391f

4. Enable swap partition

[root@devsz wxadmin]# swapon /opt/swapfile

5. Check the swap partition status

[root@devsz wxadmin]# free -m
       total used free shared buff/cache available
Mem: 3789 2682 208 280 898 586
Swap: 4095 0 4095
[root@devsz wxadmin]# 

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