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Linux 增加swap分区大小

  • 2026-02-04 12:51:28
Linux 增加swap分区大小

如果系统的物理内存用光了,系统就会跑得很慢,但仍能运行;如果Swap空间用光了,那么系统就会发生错误。例如,Swap空间用完,则服务进程无法启动,通常会出现“application is out of memory”的错误,严重时会造成服务进程的死锁。因此Swap空间的分配是很重要的,通常Swap空间的大小应是物理内存的2-2.5倍.此方法不限于centos,linux均适用以下命令均需在root帐号下操作

1.先用free -m查看一下swap的大小

[root@CentOS7 ~]# free -m              total        used        free      shared  buff/cache   availableMem:           3789        3143         504           8         140         456Swap:          3967           0        3967You have mail in /var/spool/mail/root

2.用命令cd /usr,先进入usr路径中,新建一个文件夹swap

[root@CentOS7 ~]# cd /usr[root@CentOS7 usr]# mkdir swap[root@CentOS7 usr]# 

3. 创建后进行进入到该swap文件夹路径,命令为:cd swap,用命令ll查看使用量为0

[root@CentOS7 usr]# cd swap[root@CentOS7 swap]# lltotal 0[root@CentOS7 swap]# 

4.这里我们创建swap文件,命令为:dd if=/dev/zero of=swapfile bs=1G count=5这条命令从硬盘里分出一个1×5G 大小的空间,挂在swapfile上。

[root@CentOS7 swap]# dd if=/dev/zero of=swapfile bs=1G count=55+0 records in5+0 records out5368709120 bytes (5.4 GB) copied, 11.3948 s, 471 MB/s[root@CentOS7 swap]# 

5.swapfile文件完成后,用命令ll -h查看用量为5G

[root@CentOS7 swap]# ll -htotal 5.0G-rw-r--r--. 1 root root 5.0G Aug 26 09:36 swapfile[root@CentOS7 swap]# 

6.swapfile文件创建后,需要构建swap格式于/usr/swap/swapfile 上命令为:mkswap /usr/swap/swapfile

[root@CentOS7 swap]# mkswap /usr/swap/swapfileSetting up swapspace version 1, size = 5242876 KiBno label, UUID=18c123df-4746-49d1-a8e8-f8909d661c15[root@CentOS7 swap]# 

7.用命令激活swap,立即启用交换分区文件命令为:swapon /usr/swap/swapfile

[root@CentOS7 swap]# swapon /usr/swap/swapfileswapon: /usr/swap/swapfile: insecure permissions 0644, 0600 suggested.[root@CentOS7 swap]# 

执行以上命令可能会出现:“不安全的权限 0644,建议使用 0600”类似提示,不要紧张,实际上已经激活了,可以忽略提示,也可以听从系统的建议修改下

[root@CentOS7 swap]# chmod -R 0600 /usr/swap/swapfile

查看swap已经增加:

[root@CentOS7 swap]# free -m              total        used        free      shared  buff/cache   availableMem:           3789        3104         164           0         521         469Swap:          9087          73        9014

但是这样的设置重启后就失效了,为了保证每次启动都能启用该交换空间,需要手动编辑文件/etc/fstab中的swap行命令为:vi /etc/fstab添加命令行:/usr/swap/swapfile      swap                    swap    defaults        0 0

[root@CentOS7 swap]# vi /etc/fstab## /etc/fstab# Created by anaconda on Tue Aug  4 09:49:46 2020## 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#/dev/mapper/centos-root /                       xfs     defaults        0 0UUID=5b909982-15b5-4fe0-a1ac-57e269825dcf /boot                   xfs     defaults        0 0/dev/mapper/centos-home /home                   xfs     defaults        0 0/dev/mapper/centos-swap swap                    swap    defaults        0 0/usr/swap/swapfile swap                         swap    defaults        0 0~                                                                               

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  1. CONNECT:[ UseTime:0.000596s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000752s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009107s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000446s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000507s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000515s ]
  8. SELECT * FROM `article` WHERE `id` = 460087 LIMIT 1 [ RunTime:0.000438s ]
  9. UPDATE `article` SET `lasttime` = 1770587020 WHERE `id` = 460087 [ RunTime:0.006908s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000254s ]
  11. SELECT * FROM `article` WHERE `id` < 460087 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000426s ]
  12. SELECT * FROM `article` WHERE `id` > 460087 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000511s ]
  13. SELECT * FROM `article` WHERE `id` < 460087 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000702s ]
  14. SELECT * FROM `article` WHERE `id` < 460087 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000696s ]
  15. SELECT * FROM `article` WHERE `id` < 460087 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006351s ]
0.095325s