一、查看內(nèi)存占用

# free -m

以MB為單位顯示內(nèi)存使用情況

[root@localhost ~]# free -m

total used free shared buff/cache available

Mem: 11852 1250 8668 410 1934 9873

Swap: 6015 0 6015

# free -h

以GB為單位顯示內(nèi)存使用情況

[root@localhost ~]# free -h

total used free shared buff/cache available

Mem: 11G 1.2G 8.5G 410M 1.9G 9.6G

Swap: 5.9G 0B 5.9G

# free -t

以總和的形式查詢內(nèi)存的使用信息

[root@localhost ~]# free -t

total used free shared buff/cache available

Mem: 12137332 1285344 8870628 420268 1981360 10105740

Swap: 6160380 0 6160380

Total: 18297712 1285344 15031008

# free -s 5

周期性的查詢內(nèi)存使用信息

每5秒執(zhí)行一次命令

[root@localhost ~]# free -s 5

total used free shared buff/cache available

Mem: 12137332 1280796 8875008 420268 1981528 10110136

Swap: 6160380 0 6160380

解釋：

Mem：內(nèi)存的使用情況總覽表

total：機(jī)器總的物理內(nèi)存

used：用掉的內(nèi)存

free：空閑的物理內(nèi)存

注：物理內(nèi)存(total)=系統(tǒng)看到的用掉的內(nèi)存(used)+系統(tǒng)看到空閑的內(nèi)存(free)

二、查看CPU使用情況

# top -d 5

周期性的查詢CPU使用信息

每5秒刷新一次

top - 02:37:55 up 4 min, 1 user, load average: 0.02, 0.10, 0.05

Tasks: 355 total, 1 running, 354 sleeping, 0 stopped, 0 zombie

%Cpu(s): 3.0 us, 2.8 sy, 0.0 ni, 94.2 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st

KiB Mem : 1868660 total, 1081340 free, 578388 used, 208932 buff/cache

KiB Swap: 4194300 total, 4194300 free, 0 used. 1123992 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

2220 mysql 20 0 1307796 471172 7608 S 0.6 25.2 0:02.31 mysqld

349 root 20 0 0 0 0 S 0.4 0.0 0:01.14 kworker/0:3

644 root 20 0 0 0 0 S 0.4 0.0 0:00.17 xfsaild/dm-0

3489 root 20 0 146432 2268 1440 R 0.4 0.1 0:00.11 top

1 root 20 0 44500 7120 2596 S 0.2 0.4 0:01.69 systemd

283 root 39 19 0 0 0 S 0.2 0.0 0:00.18 khugepaged

2621 root 20 0 141264 5140 3896 S 0.2 0.3 0:00.18 sshd

2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd

3 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0

4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0

5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H

6 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kworker/u256:0

7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0

8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh

9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0

10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1

11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/2

12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/3

13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/4

14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/5

15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/6

16 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/7

17 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/8

18 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/9

19 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/10

20 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/11

21 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/12

22 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/13

23 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/14

24 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/15

25 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/16

26 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/17

27 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/18

28 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/19

29 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/20

30 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/21

三、查看網(wǎng)絡(luò)情況

# ifconfig

[root@localhost ~]# ifconfig

eno16777736: flags=4163 mtu 1500

inet 192.168.2.80 netmask 255.255.255.0 broadcast 192.168.2.255

inet6 fe80::20c:29ff:fe4c:ff47 prefixlen 64 scopeid 0x20

ether 00:0c:29:4c:ff:47 txqueuelen 1000 (Ethernet)

RX packets 7866 bytes 632606 (617.7 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 215 bytes 31932 (31.1 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10

loop txqueuelen 0 (Local Loopback)

RX packets 8 bytes 400 (400.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 8 bytes 400 (400.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

# ip a

[root@localhost ~]# ip a

1: lo: mtu 65536 qdisc noqueue state UNKNOWN

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: eno16777736: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 00:0c:29:4c:ff:47 brd ff:ff:ff:ff:ff:ff

inet 192.168.2.80/24 brd 192.168.2.255 scope global eno16777736

valid_lft forever preferred_lft forever

inet6 fe80::20c:29ff:fe4c:ff47/64 scope link

valid_lft forever preferred_lft forever

四、查看磁盤以及分區(qū)情況

# df -Th

查看分區(qū)、掛載情況

[root@localhost ~]# df -Th

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/centos-root xfs 15G 2.8G 13G 19% /

devtmpfs devtmpfs 903M 0 903M 0% /dev

tmpfs tmpfs 913M 0 913M 0% /dev/shm

tmpfs tmpfs 913M 8.6M 904M 1% /run

tmpfs tmpfs 913M 0 913M 0% /sys/fs/cgroup

/dev/sda1 xfs 297M 115M 183M 39% /boot

tmpfs tmpfs 183M 0 183M 0% /run/user/0

# lsblk

查看磁盤情況

[root@localhost ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 20G 0 disk

├─sda1 8:1 0 300M 0 part /boot

└─sda2 8:2 0 19G 0 part

├─centos-root 253:0 0 15G 0 lvm /

└─centos-swap 253:1 0 4G 0 lvm [SWAP]

sr0 11:0 1 4G 0 rom

# fdisk -l

查看詳細(xì)的硬盤分區(qū)情況

[root@localhost ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x0004a0a8

Device Boot Start End Blocks Id System

/dev/sda1 * 2048 616447 307200 83 Linux

/dev/sda2 616448 40478719 19931136 8e Linux LVM

Disk /dev/mapper/centos-root: 16.1 GB, 16106127360 bytes, 31457280 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

end

標(biāo)簽：00.00,20,0.0,bytes,rcuob,Linux,使用率,root,CPU

來源： https://www.cnblogs.com/djlsunshine/p/10833343.html

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