一、查看内存占用
# free -m
以MB为单位显示内存使用情况
[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为单位显示内存使用情况
[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
以总和的形式查询内存的使用信息
[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
周期性的查询内存使用信息
每5秒执行一次命令
[root@localhost ~]# free -s 5
total used free shared buff/cache available
Mem: 12137332 1280796 8875008 420268 1981528 10110136
Swap: 6160380 0 6160380
解释：
Mem：内存的使用情况总览表
total：机器总的物理内存
used：用掉的内存
free：空闲的物理内存
注：物理内存(total)=系统看到的用掉的内存(used)+系统看到空闲的内存(free)
二、查看CPU使用情况
# top -d 5
周期性的查询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、查看网络情况
# 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、查看磁盘以及分区情况
# df -Th
查看分区、挂载情况
[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
查看磁盘情况
[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
查看详细的硬盘分区情况
[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
标签：00.00,20,0.0,bytes,rcuob,Linux,使用率,root,CPU
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