查看磁盘占用
先查看总计
df -h
Filesystem Size Used Avail Use% Mounted on
udev 462M 0 462M 0% /dev
tmpfs 99M 1.1M 98M 2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 8.8G 5.6G 2.8G 68% /
tmpfs 493M 0 493M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 493M 0 493M 0% /sys/fs/cgroup
/dev/loop0 100M 100M 0 100% /snap/core/11167
/dev/loop2 56M 56M 0 100% /snap/core18/2066
/dev/loop3 33M 33M 0 100% /snap/snapd/12057
/dev/sda2 976M 80M 830M 9% /boot
tmpfs 99M 0 99M 0% /run/user/0
查看具体目录下的大小，并用sort排序
du -s /* | sort -nr
1803956 /var
1426132 /usr
642492 /lib
597555 /snap
79056 /boot
26148 /tmp
21872 /root
16072 /bin
15408 /sbin
6720 /etc
1052 /run
36 /home
16 /opt
16 /lost+found
4 /srv
4 /mnt
4 /media
4 /lib64
查看当前目录下文件及目录大小情况
du -h --max-depth=1
查看内存占用
- top，交互命令界面下，按M，按照内存占用排序
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
430 root 19 -1 294532 58080 57560 S 0.0 5.8 0:37.33 systemd-journal
2294 mysql 20 0 1302768 18244 8564 S 0.0 1.8 3:05.17 mysqld
1037 root 20 0 674172 14896 5324 S 0.0 1.5 1:08.17 snapd
9818 root 20 0 107992 7064 6048 S 0.3 0.7 0:00.31 sshd
9900 root 20 0 52396 6180 4280 S 0.0 0.6 0:00.17 zsh
1 root 20 0 160180 5860 3628 S 0.0 0.6 0:51.14 systemd
10158 root 20 0 42776 3928 3332 R 0.3 0.4 0:00.06 top
15619 root 20 0 76640 3768 3228 S 0.0 0.4 0:00.04 systemd
942 root 20 0 286260 2952 2472 S 0.0 0.3 0:06.95 accounts-daemon
980 root 20 0 70560 2560 2276 S 0.0 0.3 0:00.55 systemd-logind
447 root 20 0 45980 2484 1484 S 0.0 0.2 0:01.76 systemd-udevd
1058 root 20 0 288888 1640 1288 S 0.0 0.2 0:00.13 polkitd
944 message+ 20 0 50192 1636 1192 S 0.0 0.2 0:00.86 dbus-daemon
986 root 20 0 629764 1468 404 S 0.0 0.1 0:02.04 lxcfs
873 systemd+ 20 0 79920 1272 1116 S 0.0 0.1 0:00.19 systemd-network
1038 syslog 20 0 263044 852 0 S 0.0 0.1 0:07.73 rsyslogd
1097 root 20 0 72308 744 668 S 0.0 0.1 0:00.01 sshd
5329 redis 20 0 50160 640 568 R 0.3 0.1 2:07.54 redis-serve
- free
total used free shared buff/cache available
Mem: 1008736 145764 246260 852 616712 678708
Swap: 1852412 362752 1489660
- cat /proc/meminfo
MemTotal: 1008736 kB
MemFree: 246368 kB
MemAvailable: 678784 kB
Buffers: 94612 kB
Cached: 251232 kB
SwapCached: 27984 kB
Active: 258104 kB
Inactive: 148036 kB
Active(anon): 19336 kB
Inactive(anon): 41812 kB
Active(file): 238768 kB
Inactive(file): 106224 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 1852412 kB
SwapFree: 1489660 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 34640 kB
Mapped: 81804 kB
Shmem: 852 kB
Slab: 307132 kB
SReclaimable: 270836 kB
SUnreclaim: 36296 kB
KernelStack: 2748 kB
PageTables: 5064 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 2356780 kB
Committed_AS: 1111028 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 118720 kB
DirectMap2M: 929792 kB