一、检查本地环境

1.检查系统版本

# cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.2 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.2 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

2.检查系统内核版本

# uname -r 
5.9.0-rc7-aml-s812

二、检查当前swap分区情况

1.检查swap分区

# free -m
              total        used        free      shared  buff/cache   available
Mem:            989         622          65          57         300         289
Swap:             0           0           0

2.查看磁盘分区情况

# df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  458M     0  458M   0% /dev
tmpfs          tmpfs      99M   12M   88M  12% /run
/dev/mmcblk0p2 ext4      6.5G  1.9G  4.6G  30% /
tmpfs          tmpfs     495M     0  495M   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs          tmpfs     495M     0  495M   0% /sys/fs/cgroup
tmpfs          tmpfs     495M     0  495M   0% /tmp
/dev/mmcblk0p1 vfat      488M   51M  437M  11% /boot
armbian-ramlog tmpfs      50M   30M   21M  60% /var/log
/dev/sda1      ext4      458G  132G  303G  31% /data/disk01
tmpfs          tmpfs      99M     0   99M   0% /run/user/0
overlay        overlay   458G  132G  303G  31% /data/disk01/docker/overlay2/a6012c01a075e6ad71d286849733a0fcec62ee6e6ff4d46d3bd6891cd9d8ca57/merged
overlay        overlay   458G  132G  303G  31% /data/disk01/docker/overlay2/6dcb0532e2a77c47eeccc7886ab2091afa3b3ce02ecc5043ea39285243b6b68a/merged

三、配置交换分区

1.创建swap目录

mkdir -p /data/disk01/swap/

2.创建swap文件

root@onecloud:/data/disk01# dd if=/dev/zero of=/data/disk01/swap/myswap01 bs=2M count=1024
1024+0 records in
1024+0 records out
2147483648 bytes (2.1 GB, 2.0 GiB) copied, 66.0062 s, 32.5 MB/s

3.将生成的文件转换为Swap文件

root@onecloud:/data/disk01/swap# mkswap -f myswap01 
mkswap: myswap01: insecure permissions 0644, 0600 suggested.
Setting up swapspace version 1, size = 2 GiB (2147479552 bytes)
no label, UUID=bb9a5e22-888d-4f6f-96af-a7933f46561d

4.激活Swap文件

root@onecloud:/data/disk01/swap# swapon myswap01
swapon: /data/disk01/swap/myswap01: insecure permissions 0644, 0600 suggested.

5.查看swap大小

root@onecloud:/data/disk01/swap# free -m
              total        used        free      shared  buff/cache   available
Mem:            989         617         123          55         247         281
Swap:          2047           0        2047

四、配置永久swap

1.修改fastab文件

在/etc/fstab文件永久设置swap挂载

root@onecloud:/data/disk01/swap# grep swap  /etc/fstab 
/data/disk01/swap/myswap01 swap swap defaults,nofail 0 0  

2.检查swap分区

root@onecloud:/data/disk01/swap# swapon -a
root@onecloud:/data/disk01/swap# swapon -s
Filename				Type		Size	Used	Priority
/data/disk01/swap/myswap01             	file    	2097148	0	-2

3.查看交换分区

/data/disk01/swap/myswap01             	file    	2097148	0	-2
root@onecloud:/data/disk01/swap# free -h 
              total        used        free      shared  buff/cache   available
Mem:          989Mi       621Mi        70Mi        55Mi       296Mi       276Mi
Swap:         2.0Gi          0B       2.0Gi

4.关闭交换分区

swapoff -a

五、重启服务器测试

1.重启服务器

root

2.重新检查swap交换分区

# free -h
              total        used        free      shared  buff/cache   available
Mem:          989Mi       244Mi       224Mi        39Mi       520Mi       678Mi
Swap:         2.0Gi          0B       2.0Gi