记一次linux磁盘清理

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我是靠谱客的博主冷静自行车，最近开发中收集的这篇文章主要介绍记一次linux磁盘清理，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

Xshell 6 (Build 0170)
Copyright (c) 2002 NetSarang Computer, Inc. All rights reserved.

Type `help' to learn how to use Xshell prompt.
[C:~]$

Connecting to 47.97.27.199:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.

WARNING! The remote SSH server rejected X11 forwarding request.
Last login: Thu Apr 9 20:34:13 2020 from 124.79.221.3

Welcome to Alibaba Cloud Elastic Compute Service !

[root@izbp1c527y2uc9f7yez4g4z ~]# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
[root@izbp1c527y2uc9f7yez4g4z ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 909M 0 909M 0% /dev
tmpfs 919M 0 919M 0% /dev/shm
tmpfs 919M 90M 830M 10% /run
tmpfs 919M 0 919M 0% /sys/fs/cgroup
/dev/vda1 40G 40G 0 100% /
overlay 40G 40G 0 100% /var/lib/docker/overlay/69e1f2f3ad0db7bf298713a823b532cad530c5a89ef9cb5c7fe527ed95e349c3/merged
shm 64M 0 64M 0% /var/lib/docker/containers/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b/shm
tmpfs 184M 0 184M 0% /run/user/0
[root@izbp1c527y2uc9f7yez4g4z ~]# du -h --max-depth=1 - 未发现占用太大的文件与目录
100K   ./.cache
12K   ./.config
18M   ./.npminstall_tarball
8.0K   ./.docker
8.0K   ./.oracle_jre_usage
4.0K   ./.ssh
32M   ./.bundle
49M   ./.npm
8.0K   ./.pki
8.0K   ./.arthas
8.0K   ./.pip
4.2M   ./.gem
102M   .
[root@izbp1c527y2uc9f7yez4g4z ~]# pwd
/root
[root@izbp1c527y2uc9f7yez4g4z ~]# cd /
[root@izbp1c527y2uc9f7yez4g4z /]# du -h --max-depth=1
0   ./sys
0   ./dev
132K   ./tmp
102M   ./root
4.0K   ./opt
4.0K   ./media
du: cannot access ‘./proc/6775/task/6775/fd/4’: No such file or directory
du: cannot access ‘./proc/6775/task/6775/fdinfo/4’: No such file or directory
du: cannot access ‘./proc/6775/fd/3’: No such file or directory
du: cannot access ‘./proc/6775/fdinfo/3’: No such file or directory
0   ./proc
31G   ./var
90M   ./run
4.0K   ./srv
38M   ./etc
40K   ./home

^C
[root@izbp1c527y2uc9f7yez4g4z /]# ll
total 60
lrwxrwxrwx 1 root root 7 Oct 12 2019 bin -> usr/bin
dr-xr-xr-x. 5 root root 4096 Nov 27 02:13 boot
drwxr-xr-x 19 root root 2960 Nov 27 02:13 dev
drwxr-xr-x. 81 root root 4096 Apr 3 17:54 etc
drwxr-xr-x. 3 root root 4096 Nov 15 20:57 home
lrwxrwxrwx 1 root root 7 Oct 12 2019 lib -> usr/lib
lrwxrwxrwx 1 root root 9 Oct 12 2019 lib64 -> usr/lib64
drwx------. 2 root root 16384 Oct 15 2017 lost+found
drwxr-xr-x. 2 root root 4096 Apr 11 2018 media
drwxr-xr-x. 3 root root 4096 Nov 27 03:36 mnt
drwxr-xr-x. 2 root root 4096 Apr 11 2018 opt
dr-xr-xr-x 96 root root 0 Nov 27 02:12 proc
dr-xr-x---. 14 root root 4096 Apr 7 17:58 root
drwxr-xr-x 27 root root 860 Apr 3 15:52 run
lrwxrwxrwx 1 root root 8 Oct 12 2019 sbin -> usr/sbin
drwxr-xr-x. 2 root root 4096 Apr 11 2018 srv
dr-xr-xr-x 13 root root 0 Nov 27 04:03 sys
drwxrwxrwt. 9 root root 4096 Apr 19 13:27 tmp
drwxr-xr-x. 13 root root 4096 Apr 3 16:11 usr
drwxr-xr-x. 21 root root 4096 Oct 13 2019 var
[root@izbp1c527y2uc9f7yez4g4z /]# cd /var/ -- 进入占用最大的文件夹，进一步定位大文件位置
[root@izbp1c527y2uc9f7yez4g4z var]# du -h --max-depth=1
4.0K   ./yp
590M   ./log
56K   ./zookeeper
4.0K   ./crash
104K   ./spool
12K   ./tmp
4.0K   ./opt
4.0K   ./games
24K   ./db
113M   ./cache
4.0K   ./gopher
4.0K   ./nis
4.0K   ./zkdata
12K   ./kerberos
31G   ./lib
4.0K   ./preserve
4.0K   ./adm
4.0K   ./local
8.0K   ./empty
31G   . -- 什么鬼？显然这种方式定位不准确，换个方式定位！！！使用 du -sh * 命令
[root@izbp1c527y2uc9f7yez4g4z var]# du -sh *
4.0K   adm
113M   cache
4.0K   crash
24K   db
8.0K   empty
4.0K   games
4.0K   gopher
12K   kerberos
31G   lib -- 发现lib文件夹占用很大空间
4.0K   local
0   lock
590M   log
0   mail
4.0K   nis
4.0K   opt
4.0K   preserve
0   run
104K   spool
12K   tmp
4.0K   yp
4.0K   zkdata
56K   zookeeper
[root@izbp1c527y2uc9f7yez4g4z var]# ll
total 76
drwxr-xr-x. 2 root root 4096 Apr 11 2018 adm
drwxr-xr-x. 5 root root 4096 Apr 11 2018 cache
drwxr-xr-x. 2 root root 4096 Aug 8 2019 crash
drwxr-xr-x. 4 root root 4096 Oct 12 2019 db
drwxr-xr-x. 3 root root 4096 Apr 11 2018 empty
drwxr-xr-x. 2 root root 4096 Apr 11 2018 games
drwxr-xr-x. 2 root root 4096 Apr 11 2018 gopher
drwxr-xr-x. 3 root root 4096 Sep 14 2019 kerberos
drwxr-xr-x. 28 root root 4096 Nov 27 02:53 lib
drwxr-xr-x. 2 root root 4096 Apr 11 2018 local
lrwxrwxrwx. 1 root root 11 Oct 15 2017 lock -> ../run/lock
drwxr-xr-x. 11 root root 4096 Apr 5 03:32 log
lrwxrwxrwx 1 root root 10 Oct 12 2019 mail -> spool/mail
drwxr-xr-x. 2 root root 4096 Apr 11 2018 nis
drwxr-xr-x. 2 root root 4096 Apr 11 2018 opt
drwxr-xr-x. 2 root root 4096 Apr 11 2018 preserve
lrwxrwxrwx. 1 root root 6 Oct 15 2017 run -> ../run
drwxr-xr-x. 9 root root 4096 Apr 11 2018 spool
drwxrwxrwt. 3 root root 4096 Apr 16 02:53 tmp
drwxr-xr-x. 2 root root 4096 Apr 11 2018 yp
drwxr-xr-x 2 root root 4096 Oct 13 2019 zkdata
drwxr-xr-x 3 root root 4096 Oct 19 2019 zookeeper
[root@izbp1c527y2uc9f7yez4g4z var]# cd lib/ -- 继续深入定位
[root@izbp1c527y2uc9f7yez4g4z lib]# du -sh *
24K   alternatives
8.0K   authconfig
8.0K   chrony
236K   cloud
4.0K   dbus
8.0K   dhclient
30G   docker -- 发现其中docker占用磁盘达到30G空间
4.0K   games
4.0K   initramfs
8.0K   logrotate
4.0K   machines
4.0K   misc
24K   NetworkManager
4.0K   ntp
4.0K   os-prober
8.0K   plymouth
28K   polkit-1
8.0K   postfix
121M   rpm
4.0K   rpm-state
8.0K   rsyslog
4.0K   selinux
12K   stateless
76K   systemd
4.0K   tuned
11M   yum
[root@izbp1c527y2uc9f7yez4g4z lib]# cd docker/ -- 继续定位
[root@izbp1c527y2uc9f7yez4g4z docker]# du -sh *
29G   containers -- docker 容器文件夹占用达29G ! ! !
2.2M   image
52K   network
1.8G   overlay
20K   plugins
4.0K   swarm
4.0K   tmp
4.0K   trust
328K   volumes
[root@izbp1c527y2uc9f7yez4g4z docker]# cd containers/
[root@izbp1c527y2uc9f7yez4g4z containers]# du -sh *
29G   0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b --- 该容器占用 29 G磁盘空间
40K   0e2cb468f07e266ade54d49807c83c027d825735be961a05ba89a3887b4dff03
40K   1d957f19855b834fbe09deffa680f348b30d986fe17ebf2477bee8ce1cbf6216
40K   3443d4a679cf2b3dcf63b72f13d0184bd95a414a24ab79496cc462c17415335d
40K   39b0d098e54cea3bc4c82deb750e6c5ccb40b706ca093848b46c55a72543bc5a
40K   568d35d5dd08526f1d6815b6ef2a7c01bc2572f5767619590e71e2b04813b450
44K   779f0adea2f95b2e639eed605a68ad47b987abc770924e09da0cd6b7853f0669
44K   98dcfc668213755d608e724da385da53282fc8f83a52654c085651559b75e25f
40K   a02de99a1da5dd3b0872001b8bcb1c5ec3150c68fd4fa1272b9d948512e4c355
40K   c9b2c49254ec3a65460a9d050f039b5ab74066c982b0275da19e946e4049e26b
28K   cba5352dc77fd2420582fd3e39d74c4ea185ac72520468542b55c3f39e8eaf2f
28K   d21bd9b988a335504cda370e9d683670c8801c9f9c6f7323f7f9fe54002efa5a
44K   dfa7e455c8b6b87613a33e76df77316cdd3a0ad23a9d6545cb87517a1c6efa47
44K   f6cbae71c3dc492c6951260420e89402de7ba70370fd6a314c8b4a3a55467c50
[root@izbp1c527y2uc9f7yez4g4z containers]# docker ps -a -- 4个月以前的容器
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0da03464277e 582b08f396ca "java -Djava.secur..." 4 months ago Up 4 months 0.0.0.0:1099->1099/tcp, 0.0.0.0:8082->8082/tcp kind_wing
0e2cb468f07e feb71ca4264f "java $JAVA_OPTS -..." 4 months ago Exited (1) 4 months ago goofy_jang
39b0d098e54c cd9bbfa896bb "java ${JAVA_OPTS}..." 4 months ago Exited (1) 4 months ago brave_noyce
d21bd9b988a3 cd9bbfa896bb "java ${JAVA_OPTS}..." 4 months ago Created youthful_morse
cba5352dc77f cd9bbfa896bb "java ${JAVA_OPTS}..." 4 months ago Created lucid_carson
98dcfc668213 bf675a1279e7 "java -Djava.secur..." 4 months ago Exited (143) 4 months ago unruffled_babbage
779f0adea2f9 bf675a1279e7 "java -Djava.secur..." 4 months ago Exited (143) 4 months ago nervous_fermi
f6cbae71c3dc 585287856ed3 "java -Djava.secur..." 4 months ago Exited (143) 4 months ago nostalgic_shannon
dfa7e455c8b6 37e171ae2021 "java -Djava.secur..." 4 months ago Exited (143) 4 months ago sad_aryabhata
c9b2c49254ec a317e91f144e "java -Djava.secur..." 4 months ago Exited (1) 4 months ago epic_kalam
3443d4a679cf 6a42529b201f "java -jar '/app.j..." 4 months ago Exited (1) 4 months ago elated_kirch
a02de99a1da5 6a42529b201f "java -jar '/app.j..." 4 months ago Exited (1) 4 months ago suspicious_wilson
1d957f19855b 34880a18e97a "java -Djava.secur..." 4 months ago Exited (1) 4 months ago goofy_carson
568d35d5dd08 hello-world "/hello" 4 months ago Exited (0) 4 months ago angry_mccarthy
[root@izbp1c527y2uc9f7yez4g4z containers]# systemctl status docker -- 查看docker状态，避免删除正在运行中使用的文件
● docker.service - Docker Application Container Engine
Loaded: loaded (/etc/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2019-11-27 07:37:31 CST; 4 months 22 days ago
Docs: https://docs.docker.com
Main PID: 29551 (dockerd)
Tasks: 43
Memory: 61.1M
CGroup: /system.slice/docker.service
├─10617 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd...
├─29551 /usr/bin/dockerd
├─31037 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 8082 -container-ip 172.17.0.2 -container-port 8082
├─31047 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 1099 -container-ip 172.17.0.2 -container-port 1099
└─31051 docker-containerd-shim 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b /var/run/docker/libcontainerd/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff816...

Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168703222+08:00" level=error msg="Failed to log msg "" for logger json-file: write /var/lib/docker/container...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168729512+08:00" level=error msg="Failed to log msg "com.mysql.cj.jdbc.exceptions.CommunicationsException: Co...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168754458+08:00" level=error msg="Failed to log msg "" for logger json-file: write /var/lib/docker/container...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168780574+08:00" level=error msg="Failed to log msg "The last packet sent successfully to the server was 0 mi...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168807526+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.exceptions.SQLError.createCommun...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168835260+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping....
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168862515+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.ConnectionImpl.createNewIO(Conne...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168909924+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.ConnectionImpl.<init>(Connection...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168940986+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.ConnectionImpl.getInstance(Conne...
Apr 19 14:03:48 izbp1c527y2uc9f7yez4g4z dockerd[29551]: time="2020-04-19T14:03:48.168971722+08:00" level=error msg="Failed to log msg "\tat com.mysql.cj.jdbc.NonRegisteringDriver.connect(Non...
Hint: Some lines were ellipsized, use -l to show in full.
[root@izbp1c527y2uc9f7yez4g4z containers]# docker container prune --- 清理容器，删除关闭的容器
WARNING! This will remove all stopped containers.
Are you sure you want to continue? [y/N] y
Deleted Containers:
0e2cb468f07e266ade54d49807c83c027d825735be961a05ba89a3887b4dff03
39b0d098e54cea3bc4c82deb750e6c5ccb40b706ca093848b46c55a72543bc5a
d21bd9b988a335504cda370e9d683670c8801c9f9c6f7323f7f9fe54002efa5a
cba5352dc77fd2420582fd3e39d74c4ea185ac72520468542b55c3f39e8eaf2f
98dcfc668213755d608e724da385da53282fc8f83a52654c085651559b75e25f
779f0adea2f95b2e639eed605a68ad47b987abc770924e09da0cd6b7853f0669
f6cbae71c3dc492c6951260420e89402de7ba70370fd6a314c8b4a3a55467c50
dfa7e455c8b6b87613a33e76df77316cdd3a0ad23a9d6545cb87517a1c6efa47
c9b2c49254ec3a65460a9d050f039b5ab74066c982b0275da19e946e4049e26b
3443d4a679cf2b3dcf63b72f13d0184bd95a414a24ab79496cc462c17415335d
a02de99a1da5dd3b0872001b8bcb1c5ec3150c68fd4fa1272b9d948512e4c355
1d957f19855b834fbe09deffa680f348b30d986fe17ebf2477bee8ce1cbf6216
568d35d5dd08526f1d6815b6ef2a7c01bc2572f5767619590e71e2b04813b450

Total reclaimed space: 0 B
[root@izbp1c527y2uc9f7yez4g4z containers]# docker system df -- 查看docker对磁盘的使用情况
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 3 1 708.6 MB 643.1 MB (90%)
Containers 1 1 0 B 0 B
Local Volumes 13 1 32.77 kB 0 B (0%)
[root@izbp1c527y2uc9f7yez4g4z containers]# df -h -- 查看目前系统磁盘占用情况
Filesystem Size Used Avail Use% Mounted on
devtmpfs 909M 0 909M 0% /dev
tmpfs 919M 0 919M 0% /dev/shm
tmpfs 919M 99M 821M 11% /run
tmpfs 919M 0 919M 0% /sys/fs/cgroup
/dev/vda1 40G 39G 0 100% / --- 仅仅释放了 1G左右的空间，显然还远远达不到清理目标
overlay 40G 39G 0 100% /var/lib/docker/overlay/69e1f2f3ad0db7bf298713a823b532cad530c5a89ef9cb5c7fe527ed95e349c3/merged
shm 64M 0 64M 0% /var/lib/docker/containers/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b/shm
tmpfs 184M 0 184M 0% /run/user/0
[root@izbp1c527y2uc9f7yez4g4z containers]# docker --version
Docker version 17.03.0-ce, build 3a232c8
[root@izbp1c527y2uc9f7yez4g4z containers]# docker info
Containers: 1
Running: 1
Paused: 0
Stopped: 0
Images: 9
...
[root@izbp1c527y2uc9f7yez4g4z containers]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0da03464277e 582b08f396ca "java -Djava.secur..." 4 months ago Up 4 months 0.0.0.0:1099->1099/tcp, 0.0.0.0:8082->8082/tcp kind_wing
[root@izbp1c527y2uc9f7yez4g4z containers]# du -sh *
29G   0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b --- 继续寻找清理目标
[root@izbp1c527y2uc9f7yez4g4z containers]# cd 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b/
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]# du -sh *
29G   0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b-json.log -- 一个占用29G的日志文件
4.0K   checkpoints
4.0K   config.v2.json
4.0K   hostconfig.json
4.0K   hostname
4.0K   hosts
4.0K   resolv.conf
4.0K   resolv.conf.hash
0   shm
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]# du -sh *
29G   0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b-json.log
4.0K   checkpoints
4.0K   config.v2.json
4.0K   hostconfig.json
4.0K   hostname
4.0K   hosts
4.0K   resolv.conf
4.0K   resolv.conf.hash
0   shm
4.0K   toTemp
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]# pwd -- 定位
/var/lib/docker/containers/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]# cat /dev/null > /var/lib/docker/containers/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b-json.log -- 删除该占用达29G的日志文件
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]#
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 909M 0 909M 0% /dev
tmpfs 919M 0 919M 0% /dev/shm
tmpfs 919M 656K 919M 1% /run
tmpfs 919M 0 919M 0% /sys/fs/cgroup
/dev/vda1 40G 11G 27G 30% / -- 可用空间达到 27G，清理目标达成，可喜可贺！！！
overlay 40G 11G 27G 30% /var/lib/docker/overlay/69e1f2f3ad0db7bf298713a823b532cad530c5a89ef9cb5c7fe527ed95e349c3/merged
shm 64M 0 64M 0% /var/lib/docker/containers/0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b/shm
tmpfs 184M 0 184M 0% /run/user/0
[root@izbp1c527y2uc9f7yez4g4z 0da03464277eff1c2e4b7505394a3c5f5d646c2fc64e225858ff8168bf7c582b]#