148 lines
2.5 KiB
Markdown
Executable File
148 lines
2.5 KiB
Markdown
Executable File
---
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title: "阿里云ecs添加swap"
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date: 2021-10-18T16:59:28+08:00
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draft: false
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---
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查看当前是没有swap的
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```bash
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$ free -m
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total used free shared buffers cached
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Mem: 498 310 187 0 17 170
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-/+ buffers/cache: 122 375
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Swap: 0 0 0
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$ sudo df -hT
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Filesystem Type Size Used Avail Use% Mounted on
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/dev/xvda1 ext4 20G 3.7G 16G 20% /
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tmpfs tmpfs 250M 0 250M 0% /dev/shm
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```
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我们将swap挂载到/var下
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$ sudo dd if=/dev/zero of=/var/swap bs=1M count=2048
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2048+0 records in
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2048+0 records out
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2147483648 bytes (2.1 GB) copied, 47.8375 s, 44.9 MB/s
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$ sudo mkswap /var/swap
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$ sudo chmod 0600 /var/swap
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$ sudo swapon /var/swap
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挂载完毕后，查看内存使用情况。发现swap出现了。
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[root@iZ23zvh0w6mZ lnmp1.1-full]# free -m
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total used free shared buffers cached
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Mem: 498 456 41 0 10 100
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-/+ buffers/cache: 346 152
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Swap: 2047 0 2047
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ok，swap已经可以使用了，接下来我们要将swap开机自动挂载。
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编辑/etc/fstab文件
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$ sudo vi /etc/fstab
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\#
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\# /etc/fstab
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\# Created by anaconda on Mon Aug 11 16:27:41 2014
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\#
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\# Accessible filesystems, by reference, are maintained under '/dev/disk'
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\# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
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\#
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UUID=e76a7b8d-20c2-4f94-bdd1-f4054a34c206 / ext4 defaults,barrier=0 1 1
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tmpfs /dev/shm tmpfs defaults 0 0
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devpts /dev/pts devpts gid=5,mode=620 0 0
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sysfs /sys sysfs defaults 0 0
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proc /proc proc defaults 0 0
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none /proc/xen xenfs defaults 0 0
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/var/swap swap swap defaults 0 0
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因为阿里云默认是不让用户使用swap的（貌似现在的系统模版更新了，这一行新装系统都没有了，如果没有请忽略此步。）。
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编辑/etc/rc.d/rc.local文件，将文件中的swapoff行注释或删掉。
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$ sudo vi /etc/rc.d/rc.local
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\#!/bin/sh
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\#
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\# This script will be executed *after* all the other init scripts.
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\# You can put your own initialization stuff in here if you don't
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\# want to do the full Sys V style init stuff.
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touch /var/lock/subsys/local
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ulimit -SHn 65535
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\#swapoff -a //加上"#"号注释掉或者直接删除 |