https://www.123si.org/os/article/centos-7-scheduling-solves-the-problem-of-insufficient-disk-space/
查看磁盘空间
df -h
[root@VM_16_6_centos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 909M 0 909M 0% /dev
tmpfs 920M 0 920M 0% /dev/shm
tmpfs 920M 524K 919M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
/dev/vda1 50G 47G 0 100% /
tmpfs 184M 0 184M 0% /run/user/0
查看每个目录或文件，所占用的磁盘空间大小
du -sh /usr/local/nginx/*
[root@VM_16_6_centos ~]# du -sh /usr/local/nginx/*
4.0K /usr/local/nginx/client_body_temp
64K /usr/local/nginx/conf
4.0K /usr/local/nginx/fastcgi_temp
12K /usr/local/nginx/html
34G /usr/local/nginx/logs
4.0M /usr/local/nginx/proxy_temp
3.3M /usr/local/nginx/sbin
4.0K /usr/local/nginx/scgi_temp
4.0K /usr/local/nginx/uwsgi_temp
查看根目录下各个文件占用情况（max-depth表示目录的深度）
du -ah --max-depth=1 /
查看某个目录大小
du -bsh /usr/
