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Linux内存不足增加虚拟内存的方法

2015-01-07 10:47 274 查看

a) Login as the root user SSH登录root 账户

b) Type following command to create 2G swap file (1024 * 2048MB = 2097152 block size):


dd if=/dev/zero of=/swapfile1 bs=1024 count=2097152


c) Set up a Linux swap area:


mkswap /swapfile1


d) Activate /swapfile1 swap space immediately:


swapon /swapfile1


e) To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using text editor such as vi:


vi /etc/fstab


Append following line:


/swapfile1 swap swap defaults 0 0


So next time Linux comes up after reboot, it enables the new swap file for you automatically.

g) How do I verify swap is activated or not?

Simply use free command:


$ free -m


如果想关闭虚拟内存或者向扩大, 要先disable


swapoff /swapfile1

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