TL;DR
一个服务器磁盘占用多了，本文是排查磁盘占用和清理的经验。
有用的命令：
df -h 磁盘当前总体占用情况
du -h -t 1G / 从根目录查找大于1G的目录或文件
du -h -s /usr/* | sort -nr 显示/usr/目录下各子目录的大小
排查和清理过程
1、先看看当前磁盘总体情况 df -h
[root@VM_0_11_centos /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 50G 44G 3.2G 94% /
devtmpfs 909M 0 909M 0% /dev
tmpfs 920M 24K 920M 1% /dev/shm
tmpfs 920M 544K 919M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
tmpfs 184M 0 184M 0% /run/user/0
可以看到目前磁盘已经使用了94%了，需要关注并尝试清理了。磁盘满了会导致主机上的应用故障。
2、然后在从根目录排查哪个目录、文件占用磁盘空间比较多 du -h -s | sort -nr
[root@VM_0_11_centos /]# du -s -h /* | sort -nr
du: cannot access ‘/proc/1807/task/1807/fd/4’: No such file or directory
du: cannot access ‘/proc/1807/task/1807/fdinfo/4’: No such file or directory
du: cannot access ‘/proc/1807/fd/4’: No such file or directory
du: cannot access ‘/proc/1807/fdinfo/4’: No such file or directory
573M /home
544K /run
503M /data
159M /opt
156K /tmp
108M /boot
57M /etc
26G /usr
16K /lost+found
11G /var
4.1G /root
4.0K /srv
4.0K /mnt
4.0K /media
2.1G /swapfile
0 /sys
0 /sbin
0 /proc
0 /lib64
0 /lib
0 /dev
0 /bin
占用最多的是/usr， 那么继续从这个目录向下排查：
[root@VM_0_11_centos /]# du -h -s /usr/* | sort -nr
816M /usr/hbase-2.3.7
704M /usr/hbase-2.2.4
657M /usr/bin
541M /usr/java
504M /usr/lib
465M /usr/apache-phoenix-5.0.0-HBase-2.0-bin
452M /usr/sbin
424M /usr/lib64
417M /usr/apache-phoenix-5.0.0-HBase-2.0-bin.tar.gz
415M /usr/hbase-1.3.6
333M /usr/share
261M /usr/hbase-2.3.7-bin.tar.gz
220M /usr/phoenix-hbase-2.3-5.1.2-bin
214M /usr/hbase-2.2.4-bin.tar.gz
194M /usr/phoenix-hbase-2.3-5.1.2-bin.tar.gz
193M /usr/kafka_2.12-1.0.0
152M /usr/redis-6.0.3
152K /usr/zooData
107M /usr/hbase-1.3.6-bin.tar.gz
106M /usr/src
55M /usr/libexec
53M /usr/rocketmq-4.8.0
43M /usr/kafka_2.12-1.0.0.tgz
42M /usr/apache-zookeeper-3.6.3-bin
22M /usr/include
17G /usr/local
12M /usr/apache-zookeeper-3.6.3-bin.tar.gz
8.0K /usr/redis-script
4.0K /usr/games
4.0K /usr/etc
2.2M /usr/redis-6.0.3.tar.gz
1.2G /usr/prometheus
1.1G /usr/mysql-5.7
0 /usr/tmp
[root@VM_0_11_centos /]# du -h -s /usr/local/* | sort -nr
731M /usr/local/qcloud
96K /usr/local/lib64
46M /usr/local/bin
16G /usr/local/openresty
4.0K /usr/local/src
4.0K /usr/local/sbin
4.0K /usr/local/libexec
4.0K /usr/local/lib
4.0K /usr/local/include
4.0K /usr/local/games
4.0K /usr/local/etc
1.2M /usr/local/share
0 /usr/local/yd.socket.server
[root@VM_0_11_centos /]# du -h -s /usr/local/openresty/nginx/* | sort -nr
84K /usr/local/openresty/nginx/conf
60K /usr/local/openresty/nginx/html
32M /usr/local/openresty/nginx/sbin
16K /usr/local/openresty/nginx/tapset
16G /usr/local/openresty/nginx/logs
4.0K /usr/local/openresty/nginx/uwsgi_temp
4.0K /usr/local/openresty/nginx/scgi_temp
4.0K /usr/local/openresty/nginx/proxy_temp
4.0K /usr/local/openresty/nginx/fastcgi_temp
4.0K /usr/local/openresty/nginx/client_body_temp
[root@VM_0_11_centos /]# du -h -s /usr/local/openresty/nginx/logs/* | sort -nr
190M /usr/local/openresty/nginx/logs/access.log
16G /usr/local/openresty/nginx/logs/error.log
4.0K /usr/local/openresty/nginx/logs/nginx.pid
找到原因了，nginx的error.log文件很久没清理了。
3、清空文件
cat /dev/null > /usr/local/openresty/nginx/logs/error.log
再次查看各个文件大小
[root@VM_0_11_centos /]# du -h -t 1G /
1.2G /usr/prometheus
1.1G /usr/mysql-5.7
11G /usr
4.0G /var/log/journal/0ea734564f9a4e2881b866b82d679dfc
4.0G /var/log/journal
4.6G /var/log
4.9G /var/lib/mysql/test_perf_db
5.2G /var/lib/mysql
5.7G /var/lib
11G /var
3.6G /root/logs/rocketmqlogs
3.7G /root/logs
4.1G /root
29G /
类似的，再去清理rocketmqlogs
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