云主机创建交换分区

1.使用dd命令创建一个大小为2G的文件
[root@db-test-ls-3dd0 ~]# dd if=/dev/zero of=/u01/swapfile1 bs=1024 count=2097152
2097152+0 records in
2097152+0 records out
2147483648 bytes (2.1 GB) copied, 7.841 s, 274 MB/s

2.创建为Linux Swap虚拟交换文件

[root@db-test-ls-3dd0 u01]# mkswap /u01/swapfile1
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=0173c4b2-bc45-46a9-a37c-7c803a943a22

3.激活
[root@db-test-ls-3dd0 u01]# swapon /u01/swapfile1
swapon: /u01/swapfile1: insecure permissions 0640, 0600 suggested.