Centos如何关闭交换分区Swap

Centos的swap分区在开启的情况下，可能会导致性能下降，在使用k8s时，要求关闭swap

环境

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[root@dev127 paoshang]# cat /etc/redhat-release 
CentOS Linux release 7.9.2009 (Core)

关闭swap分区

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swapoff -a

修改配置文件/etc/fstab,删除swap相关的行

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[root@dev127 paoshang]# cat /etc/fstab
```bash
#
# /etc/fstab
# Created by anaconda on Tue Jun  9 19:47:48 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
#
UUID=4541be7b-65a9-45f2-983a-8439a534b99c /                       xfs     defaults        0 0
UUID=d30bfeaa-770a-43b4-8567-a9fa4e221786 /boot                   xfs     defaults        0 0
#UUID=16cc8806-a33e-4a65-b118-e3338ebba38d swap                    swap    defaults        0 0
/dev/sdb /data ext4 defaults 0 0

确认swap已经关闭

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free -m

调整swappiness参数

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echo 0 > /proc/sys/vm/swappiness
vim /etc/sysctl.conf
vm.swappiness=0

使修改生效

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sysctl -p


## 参考
- https://www.cnblogs.com/larrypeng/p/11950498.html