云主机默认是没有swap分区的，所以在配置的时候需要手工的配置一下swap分区。 方法如下：http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794

http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794http://www.cndba.cn/dave/article/1794

[root@iZwz90iksa8sifjriq4iorZ /]# dd if=/dev/zero of=/swapfile bs=1M  count=4000
4000+0 records in
4000+0 records out
4194304000 bytes (4.2 GB) copied, 42.7724 s, 98.1 MB/s

[root@iZwz90iksa8sifjriq4iorZ /]# mkswap /swapfile 
Setting up swapspace version 1, size = 4095996 KiB
no label, UUID=765e7b1f-1204-4fe0-a2e5-cf30980f2065

[root@iZwz90iksa8sifjriq4iorZ /]# swapon /swapfile 
swapon: /swapfile: insecure permissions 0644, 0600 suggested.


[root@iZwz90iksa8sifjriq4iorZ /]# free -m
              total        used        free      shared  buff/cache   available
Mem:           7822         425         170           1        7226        7071
Swap:          3999           0        3999
[root@iZwz90iksa8sifjriq4iorZ /]# vi /etc/fstab

[root@iZwz90iksa8sifjriq4iorZ /]# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Fri Feb 24 02:58:22 2017
#
# 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=07151862-c2b9-45dc-bf7a-af8d2a6fa6c1 /                       ext3    defaults        1 1
/dev/vdb1				/u01			  ext4	defaults	0 0
/swapfile				swap			  swap  defaults	0 0
[root@iZwz90iksa8sifjriq4iorZ /]# 

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