查看现有的内存和swap
[root@localhost home]# free -m
total used free shared buff/cache available
Mem: 1819 614 116 27 1088 965
Swap: 2047 0 2047
安装Oracle11g需要swap大概为内存2倍,需要扩展2G左右
进行swap空间新增
1.使用dd创建swapfile,bs单位默认为byte可手动指定为M或G,count为计数
[root@localhost home]# dd if=/dev/zero of=swapfile bs=1M count=2048
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 1.96745 s, 1.1 GB/s
[root@localhost home]# ll -h
-rw-r--r-- 1 root root 2.0G Aug 10 15:58 swapfile
2.使用mkswap创建交换文件
[root@localhost home]# mkswap swapfile
Setting up swapspace version 1, size = 2097148 KiB
no label, UUID=aad23206-f04b-4122-b862-e489001ed6b4
3.使用swapon激活
[root@localhost home]# swapon swapfile
swapon: /home/swapfile: insecure permissions 0644, 0600 suggested.
#建议修改权限为0600
[root@localhost home]# swapoff swapfile
[root@localhost home]# chmod 0600 swapfile
[root@localhost home]# swapon swapfile
4.在/etc/fstab下进行添加,使swap永久生效
[root@localhost home]# vim /etc/fstab
/home/swapfile swap swap defaults 0 0
5.添加完成,查看swap分区,和总空间。
[root@localhost home]# swapon
NAME TYPE SIZE USED PRIO
/dev/dm-1 partition 2G 0B -2
/home/swapfile file 2G 0B -3
[root@localhost home]# free -m | grep Swap
Swap: 4095 0 4095