/dev/mapper/centos-root 清理
<p>一、告警现象</p><div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;">告警主机: 172.18.206.8
告警时间: 2021.02.27 18:45:05
告警等级: Average
告警信息: Free disk space is less than 20% on volume /
告警项目: vfs.fs.size[/,pfree]
问题详情: Free disk space on / (percentage):20 %
当前状态: PROBLEM:20 %
事件ID: 407292687
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<p> </p>
<p>二、清理步骤</p>
<p>1. 通过df -h 查看磁盘空间使用情况，可以看到根目录已经使用到81%了</p>
<div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;"># df -h
Filesystem SizeUsed Avail Use% Mounted on
/dev/mapper/centos-root184G147G 37G81% /
devtmpfs 32G 0 32G 0% /dev
tmpfs 32G 20K 32G 1% /dev/shm
tmpfs 32G3.2G 29G11% /run
tmpfs 32G 0 32G 0% /sys/fs/cgroup
/dev/sda2 465M126M312M29% /boot
/dev/sdb1 549G 64G458G13% /data
tmpfs 6.3G 06.3G 0% /run/user/1001
tmpfs 6.3G 06.3G 0% /run/user/700
tmpfs 6.3G 06.3G 0% /run/user/0
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<p> </p>
<p>2. 进入根目录, 可以看到/opt 目录最大</p>
<div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;"># cd /
# du -h -x --max-depth=1
37M ./etc
2.3G ./root
2.1G ./tmp
606M ./var
1.9G ./usr
279M ./home
0 ./media
0 ./mnt
122G ./opt
0 ./srv
4.0K ./script
147G .
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<p> </p>
<p>3. 进入根目录,可以看到 backup 目录占用了37G， 可以进行清理</p>
<div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;"># cd /opt
# du -h -x --max-depth=1
0 ./rh
130M ./tcloud_dev
12M ./MegaRAID
37M ./smartstorageadmin
134M ./scripts
5.1G ./install
0 ./software
7.8G ./app
0 ./app2
0 ./app3
0 ./app4
37G ./backup
0 ./backup2
0 ./backup3
0 ./backup4
56M ./config-tool
127M ./python
68M ./sor-filebeat
44G ./skywalking-agent
1.5G ./data
60K ./fnc_recon
4.0K ./cert
46M ./shardproxy
8.6G ./wintonebak
15G ./wintone
19M ./node_exporter
122G .
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<p>4. 进行backup 目录，使用rm -rf 清理掉一些备份文件</p>
<div class="cnblogs_Highlighter">
<pre class="brush:csharp;gutter:true;"># cd backup
# du -h -x --max-depth=1
124M ./20201013
3.5G ./20201014
11G ./20201019
252M ./20201020
137M ./20201021
2.5G ./20201022
244M ./20201028
6.6G ./20201103
303M ./20201105
181M ./20201118
189M ./20201125
123M ./20201126
123M ./20201127
188M ./20201202
57M ./20201203
188M ./20201207
123M ./20201211
184M ./20201214
3.3G ./20201216
191M ./20201217
6.2G ./20201223
150M ./20201224
123M ./20201229
124M ./20201230
61M ./20201231
191M ./20210118
128M ./20210120
191M ./20210121
159M ./20210128
130M ./20210129
159M ./20210201
159M ./20210203
350M ./20210224
160M ./20210226
37G .
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<p> </p>
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来源：https://www.cnblogs.com/dairenblog/p/14457136.html
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