再给服务器添加zabbix监控的时候,发现服务器有个报错“Lack of free swap space on localhost”,通过查找得知,在安装服务器的时候忘了划分swap分区。为了减少报错,现在直接划分swap分区,具体步骤如下:
1,使用dd命令创建一个swap分区
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[root@cms home] # dd if=/dev/zero of=/home/swap bs=1024 count=8192000
8192000+0 records in
8192000+0 records out 8388608000 bytes (8.4 GB) copied, 33.5006 s, 250 MB /s
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这样就创建了一个分区大小为8G的/home/swap文件,接下来格式化该分区文件。
2,格式化/home/swap文件。
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[root@cms home] # mkswap /home/swap
mkswap: /home/swap : warning: don't erase bootbits sectors
on whole disk. Use -f to force.
Setting up swapspace version 1, size = 8191996 KiB no label, UUID=4ae031dd-eefe-43ba-8fb0-c09719d896b6 |
3,用swapon命令把/home/swap文件分区划成swap分区
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[root@cms home] # swapon /home/swap
[root@cms home] # free -m
total used free shared buffers cached
Mem: 7872 7730 142 0 70 6394 -/+ buffers /cache : 1264 6608
Swap: 7999 0 7999 |
4,修改/etc/fstab文件添加/home/swap swap swap default 0 0,即使重启也能自动挂载。
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[root@cms home] # vi /etc/fstab
# # /etc/fstab # Created by anaconda on Tue Jan 26 21:10:02 2016 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=f8cb78d5-8419-4bcf-8684-9e8a94480f22 / ext4 defaults 1 1 UUID=9e4bacd3-490c-4e87-a5e0-fec240a3e229 /usr xfs defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/home/swap swap swap default 0 0
"/etc/fstab" 16L, 788C written
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备注:count的计算公式: count=SIZE*1024 (size以MB为单位)
本文转自 lqbyz 51CTO博客,原文链接:http://blog.51cto.com/liqingbiao/1740320