Linux增加swap空间

1.创建swap文件
[root@iz2zecibr4bozfdvtbnvfkz home]# dd if=/dev/zero of=/home/swap bs=50MB count=1
1+0 records in
1+0 records out
50000000 bytes (50 MB) copied, 0.101647 s, 492 MB/s
2.格式化
[root@iz2zecibr4bozfdvtbnvfkz home]# mkswap /home/swap
Setting up swapspace version 1, size = 48824 KiB
no label, UUID=7bf69c51-b6eb-417e-9440-92a45a529ae9
3.挂载swap
[root@iz2zecibr4bozfdvtbnvfkz home]# swapon /home/swap
swapon: /home/swap: insecure permissions 0644, 0600 suggested.
发现有如上警告,但是发现已经挂载上去.
[root@iz2zecibr4bozfdvtbnvfkz home]# swapon -s
Filename Type Size Used Priority
/home/swap file 48824 0 -1
4.写入/etc/fstab实现开机自动挂载
/etc/fstab增加如下行:
/home/swap swap swap defaults 0 0