https://www.cnblogs.com/zy-plan/p/8617202.html

1.系统

1.1版本

uname -a 能确认是64位还是32位，其它的信息不多

[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

more /etc/*release 可以看到更多信息

[root@localhost ~]# more /etc/*release
::::::::::::::
/etc/centos-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core) 
::::::::::::::
/etc/os-release
::::::::::::::
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"::::::::::::::
/etc/redhat-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core) 
::::::::::::::
/etc/system-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core)

1.2核数

cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

[root@localhost ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c1  Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz

1个逻辑CPU，i5型等信息

[root@localhost ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c8  Intel(R) Xeon(R) CPU E7-4820 v2 @ 2.00GHz

8个逻辑CPU

cat /proc/cpuinfo | grep physical | uniq -c

[root@localhost ~]# cat /proc/cpuinfo | grep physical | uniq -c1 physical id     : 01 address sizes   : 42 bits physical, 48 bits virtual

实际上是一颗一核的CPU

[root@localhost ~]# cat /proc/cpuinfo | grep physical | uniq -c1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual1 physical id     : 01 address sizes   : 40 bits physical, 48 bits virtual

由8个1核的CPU组成8核

cat /proc/cpuinfo可以看到更为详细的信息

[root@localhost ~]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 94
model name      : Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz
stepping        : 3
microcode       : 0x74
cpu MHz         : 2304.004
cache size      : 6144 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 22
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm hwp hwp_noitfy hwp_act_window hwp_epp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt xsavec xgetbv1 xsaves
bogomips        : 4608.00
clflush size    : 64
cache_alignment : 64
address sizes   : 42 bits physical, 48 bits virtual
power management:

1.3运行模式

getconf LONG_BIT CPU运行在多少位模式下

[root@localhost ~]# getconf LONG_BIT
64

如果是32，说明当前CPU运行在32bit模式下, 但不代表CPU不支持64bit

cat /proc/cpuinfo | grep flags | grep ‘ lm ‘ | wc -l 是否支持64位

[root@localhost ~]# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l
1

结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit

1.4计算机名

hostname

[root@localhost ~]# hostname
localhost.localdomain

1.5.查看环境变量

env

[root@localhost ~]# env
XDG_SESSION_ID=4
HOSTNAME=localhost.localdomain
SELINUX_ROLE_REQUESTED=
TERM=vt100
SHELL=/bin/bash
HISTSIZE=1000
SSH_CLIENT=192.168.174.1 58896 22
SELINUX_USE_CURRENT_RANGE=
SSH_TTY=/dev/pts/0
USER=root

1.6系统允许多长时间了/负载数

uptime

[root@localhost proc]# uptime10:55:01 up  1:28,  2 users,  load average: 0.00, 0.01, 0.05

1.当前时间10:55:01

2.系统运行了多少时间,1:28（1小时28分)

3.多少个用户,2 users

4.平均负载：0.00, 0.01, 0.05，最近1分钟、5分钟、15分钟系统的负载

直接查看平均负载情况 cat /proc/loadavg

[root@localhost proc]# cat /proc/loadavg
0.00 0.01 0.05 4/524 7152

除了前3个数字表示平均进程数量外，后面的1个分数，分母表示系统进程总数，分子表示正在运行的进程数；最后一个数字表示最近运行的进程ID

2.资源

2.1内存

cat /proc/meminfo内存的详细信息

[root@localhost proc]# cat /proc/meminfo
MemTotal:        1001332 kB
MemFree:           99592 kB
MemAvailable:     420940 kB
Buffers:            1064 kB
Cached:           405292 kB
SwapCached:            0 kB
Active:           412548 kB
Inactive:         250192 kB
Active(anon):     205264 kB
Inactive(anon):    58460 kB
Active(file):     207284 kB
Inactive(file):   191732 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       2097148 kB
SwapFree:        2097140 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:        256416 kB
Mapped:           103344 kB
Shmem:              7340 kB
Slab:             126408 kB
SReclaimable:      69912 kB
SUnreclaim:        56496 kB
KernelStack:       10416 kB
PageTables:        15520 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2597812 kB
Committed_AS:    1578872 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      170756 kB
VmallocChunk:   34359564288 kB
HardwareCorrupted:     0 kB
AnonHugePages:     75776 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       73600 kB
DirectMap2M:      974848 kB
DirectMap1G:           0 kB

MemTotal总内存，MemFree可用内存
free -m(-m，单位是m，如果是-g，单位是g）查看可用内存

[root@localhost proc]# free -mtotal        used        free      shared  buff/cache   available
Mem:            977         360          97           7         520         411
Swap:          2047           0        2047

空闲内存total-used=free+buff/cache

我们通过free命令查看机器空闲内存时，会发现free的值很小。这主要是因为，在linux中有这么一种思想，内存不用白不用，因此它尽可能的cache和buffer一些数据，以方便下次使用。但实际上这些内存也是可以立刻拿来使用的。

3.磁盘和分区

3.1查看各分区使用情况

df -h

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   45G   22G   24G  48% /
devtmpfs                 906M     0  906M   0% /dev
tmpfs                    921M   96K  921M   1% /dev/shm
tmpfs                    921M 1004K  920M   1% /run
tmpfs                    921M     0  921M   0% /sys/fs/cgroup
/dev/sda1                497M  195M  303M  40% /boot
tmpfs                    185M     0  185M   0% /run/user/1001
tmpfs                    185M     0  185M   0% /run/user/0
[root@localhost ~]#

3.2查看指定目录的大小

du -sh <目录名>

[root@localhost ~]# du -sh /root
1.2G    /root

3.3查看所有分区

fdisk -l

[root@localhost proc]# fdisk -l磁盘 /dev/sda：32.2 GB, 32212254720 字节，62914560 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0x000a0cd4设备 Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048    62914559    30944256   8e  Linux LVM磁盘 /dev/mapper/centos-root：29.5 GB, 29490151424 字节，57597952 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节磁盘 /dev/mapper/centos-swap：2147 MB, 2147483648 字节，4194304 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节磁盘 /dev/mapper/centos-docker--poolmeta：33 MB, 33554432 字节，65536 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节磁盘 /dev/mapper/docker-253:0-101330881-pool：107.4 GB, 107374182400 字节，209715200 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：65536 字节 / 65536 字节

3.4查看所有交换分区

swapon -s

[root@localhost proc]# swapon -s
文件名                          类型            大小    已用    权限
/dev/dm-1                       partition       2097148 8       -1

4.网络

4.1查看所有网络接口的属性

ifconfig

[root@localhost proc]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0ether 02:42:e1:b8:a5:4f  txqueuelen 0  (Ethernet)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.174.129  netmask 255.255.255.0  broadcast 192.168.174.255inet6 fe80::20c:29ff:fe50:b3b4  prefixlen 64  scopeid 0x20<link>ether 00:0c:29:50:b3:b4  txqueuelen 1000  (Ethernet)RX packets 28649  bytes 38411280 (36.6 MiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 8937  bytes 1226914 (1.1 MiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 0  (Local Loopback)RX packets 4  bytes 340 (340.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 4  bytes 340 (340.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255ether 00:00:00:00:00:00  txqueuelen 0  (Ethernet)RX packets 0  bytes 0 (0.0 B)RX errors 0  dropped 0  overruns 0  frame 0TX packets 0  bytes 0 (0.0 B)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

4.2 带宽

ethtool 网卡名

[root@localhost php-tomcat-base]# ethtool ens192
Settings for ens192:Supported ports: [ TP ]Supported link modes:   1000baseT/Full 10000baseT/Full Supported pause frame use: NoSupports auto-negotiation: NoAdvertised link modes:  Not reportedAdvertised pause frame use: NoAdvertised auto-negotiation: NoSpeed: 10000Mb/sDuplex: FullPort: Twisted PairPHYAD: 0Transceiver: internalAuto-negotiation: offMDI-X: UnknownSupports Wake-on: uagWake-on: dLink detected: yes

看Speed

4.3查看路由表

route -n

[root@localhost proc]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.174.2   0.0.0.0         UG    100    0        0 eth0
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
192.168.174.0   0.0.0.0         255.255.255.0   U     100    0        0 eth0
[root@localhost proc]#

4.4查看所有监听端口

netstat -lntp

[root@localhost ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      743/rpcbind         
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1740/nginx: master  
tcp        0      0 0.0.0.0:81              0.0.0.0:*               LISTEN      1740/nginx: master  
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      2194/dnsmasq        
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1543/sshd           
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      12610/cupsd         
tcp        0      0 0.0.0.0:40536           0.0.0.0:*               LISTEN      19964/rpc.statd     
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2133/master         
tcp6       0      0 :::111                  :::*                    LISTEN      743/rpcbind         
tcp6       0      0 :::81                   :::*                    LISTEN      1740/nginx: master  
tcp6       0      0 :::22                   :::*                    LISTEN      1543/sshd           
tcp6       0      0 ::1:631                 :::*                    LISTEN      12610/cupsd         
tcp6       0      0 ::1:25                  :::*                    LISTEN      2133/master         
tcp6       0      0 :::35420                :::*                    LISTEN      19964/rpc.statd     
[root@localhost ~]#

4.5查看所有已经建立的连接

netstat -antp

[root@localhost ~]# netstat -antp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      743/rpcbind         
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1740/nginx: master  
tcp        0      0 0.0.0.0:81              0.0.0.0:*               LISTEN      1740/nginx: master  
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      2194/dnsmasq        
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1543/sshd           
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      12610/cupsd         
tcp        0      0 0.0.0.0:40536           0.0.0.0:*               LISTEN      19964/rpc.statd     
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2133/master         
tcp        0      0 172.31.4.233:22         121.34.147.13:57190     ESTABLISHED 29540/sshd: cavan [ 
tcp        0      0 172.31.4.233:22         121.34.147.13:54544     ESTABLISHED 27077/sshd: cavan [ 
tcp        0     96 172.31.4.233:22         219.137.32.66:60645     ESTABLISHED 30315/sshd: root@pt 
tcp        0      0 172.31.4.233:22         121.34.147.13:56319     ESTABLISHED 28703/sshd: cavan [ 
tcp6       0      0 :::111                  :::*                    LISTEN      743/rpcbind         
tcp6       0      0 :::81                   :::*                    LISTEN      1740/nginx: master  
tcp6       0      0 :::22                   :::*                    LISTEN      1543/sshd           
tcp6       0      0 ::1:631                 :::*                    LISTEN      12610/cupsd         
tcp6       0      0 ::1:25                  :::*                    LISTEN      2133/master         
tcp6       0      0 :::35420                :::*                    LISTEN      19964/rpc.statd     
[root@localhost ~]#

4.6 某端口使用情况

lsof -i:端口号

[root@localhost mysql]# lsof -i:22
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sshd    1150 root    3u  IPv4  18264      0t0  TCP *:ssh (LISTEN)
sshd    1150 root    4u  IPv6  18273      0t0  TCP *:ssh (LISTEN)
sshd    2617 root    3u  IPv4  20437      0t0  TCP localhost.localdomain:ssh->192.168.174.1:60426 (ESTABLISHED)
[root@localhost mysql]#

或者

netstat -apn|grep 端口号

[root@localhost mysql]# netstat -apn|grep 22
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1150/sshd           
tcp        0     96 192.168.174.136:22      192.168.174.1:60426     ESTABLISHED 2617/sshd: root@pts 
tcp6       0      0 :::22                   :::*                    LISTEN      1150/sshd

5.进程

5.1查看所有进程

ps -ef,使用ps -ef|gerp tomcat过滤

[root@localhost ~]# ps -ef
UID         PID   PPID  C STIME TTY          TIME CMD
root          1      0  0 09:26 ?        00:00:03 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root          2      0  0 09:26 ?        00:00:00 [kthreadd]
root          3      2  0 09:26 ?        00:00:00 [ksoftirqd/0]
root          6      2  0 09:26 ?        00:00:00 [kworker/u256:0]
root          7      2  0 09:26 ?        00:00:00 [migration/0]
root          8      2  0 09:26 ?        00:00:00 [rcu_bh]
root          9      2  0 09:26 ?        00:00:00 [rcuob/0]
root         10      2  0 09:26 ?        00:00:00 [rcuob/1]
root         11      2  0 09:26 ?        00:00:00 [rcuob/2]
root         12      2  0 09:26 ?        00:00:00 [rcuob/3]
root         13      2  0 09:26 ?        00:00:00 [rcuob/4]
root         14      2  0 09:26 ?        00:00:00 [rcuob/5]
root         15      2  0 09:26 ?        00:00:00 [rcuob/6]
root         16      2

ps -aux可以看到进程占用CPU,内存情况

[root@localhost ~]# ps -aux
USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root          1  0.0  0.6 126124  6792 ?        Ss   09:26   0:03 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root          2  0.0  0.0      0     0 ?        S    09:26   0:00 [kthreadd]
root          3  0.0  0.0      0     0 ?        S    09:26   0:00 [ksoftirqd/0]
root          6  0.0  0.0      0     0 ?        S    09:26   0:00 [kworker/u256:0]
root          7  0.0  0.0      0     0 ?        S    09:26   0:00 [migration/0]
root          8  0.0  0.0      0     0 ?        S    09:26   0:00 [rcu_bh]
root          9  0.0  0.0      0     0 ?        S    09:26   0:00 [rcuob/0]
root         10  0.

5.2实时显示进程状态

top

[root@localhost ~]# top
top - 11:29:02 up  2:02,  2 users,  load average: 0.12, 0.04, 0.05
Tasks: 408 total,   2 running, 406 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.3 us,  0.3 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1001332 total,    92184 free,   370332 used,   538816 buff/cache
KiB Swap:  2097148 total,  2097140 free,        8 used.   419124 avail Mem PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                                              3001 gdm       20   0 1419364 122996  45860 S  1.0 12.3   0:06.50 gnome-shell                                                                                                          276 root      20   0       0      0      0 S  0.3  0.0   0:09.72 kworker/0:1                                                                                                          3765 root      20   0  142864   5128   3876 S  0.3  0.5   0:00.77 sshd                                                                                                                 7740 root      20   0  146452   2384   1432 R  0.3  0.2   0:00.17 top                                                                                                                  1 root      20   0  126124   6792   3912 S  0.0  0.7   0:03.58 systemd                                                                                                              2 root      20   0       0      0      0 S  0.0  0.0   0:00.03 kthreadd                                                                                                             3 root      20   0       0      0      0 S  0.0  0.0   0:00.37 ksoftirqd/0                                                                                                          6 root      20   0       0      0      0 S  0.0  0.0   0:00.39 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

6.用户

6.1查看活动用户

[root@localhost ~]# w11:32:36 up 72 days, 20:50,  3 users,  load average: 0.00, 0.01, 0.05
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
cavan    pts/0    121.34.147.13    09:47    1:14m  0.17s  0.17s sshd: cavan [priv]  
root     pts/1    219.137.32.66    11:19    4.00s  0.05s  0.00s w
cavan    pts/3    121.34.147.13    10:14   20:44   0.38s  0.11s vim Dockerfile
[root@localhost ~]#

6.2查看指定用户的信息

id <用户名>

[root@localhost ~]# id root
uid=0(root) gid=0(root) groups=0(root)
[root@localhost ~]# id cavan
uid=1001(cavan) gid=1001(cavan) groups=1001(cavan)
[root@localhost ~]#

6.3查看用户登录日志

last

[root@localhost 1]# last
root     pts/0        192.168.174.1    Mon Oct 24 09:51   still logged in   
(unknown :0           :0               Mon Oct 24 09:27   still logged in   
reboot   system boot  3.10.0-327.el7.x Mon Oct 24 09:26 - 11:35  (02:09)    
root     pts/0        192.168.174.1    Fri Oct 21 09:41 - 18:44  (09:03)    
(unknown :0           :0               Fri Oct 21 09:15 - 18:44  (09:28)    
reboot   system boot  3.10.0-327.el7.x Fri Oct 21 09:15 - 11:35 (3+02:20)   
root     pts/1        192.168.174.1    Thu Oct 20 10:05 - 18:13  (08:08)    
root     pts/0

6.4查看系统所有用户

cut -d: -f1 /etc/passwd

[root@localhost ~]# cut -d: -f1 /etc/passwd
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
operator
games
ftp
nobody
dbus
polkitd
abrt
unbound
colord
usbmuxd
ntp

http://www.linuxidc.com/Linux/2016-11/137550.htm

http://blog.csdn.net/dream_broken/article/details/52883883

前言

记下CentOS 7查看系统版本及查看机器位数x86-64的方法，由于不经常使用Linux，每当使用的时候就是安装软件，安装软件的时候就要选择安装包平台，是32位的还是64位的。这时候突然发现不知道怎么查，于是百度。虽然轻而易举百度出来，但仍旧没有自己的笔记看起来舒服。所以，还是记录下来。

辨识标准

首先要清楚什么样标识是32位的，什么样的是64位的。

PC server X86 系列

I386--I686 都是32位

x86_64 是 64位

查看位数命令

命令实在是不要太多，为了防止选择性障碍，一致选择第一种方式，后面的仅作为补充。
方法1：

[root@linuxidc ~]# uname -a
Linux linuxidc 3.10.0-327.18.2.el7.x86_64 #1 SMP Thu May 12 11:03:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

方法2：显示系统程序信息

[root@linuxidc ~]# file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=aa7ff68f13de25936a098016243ce57c3c982e06, stripped

方法3：

[root@linuxidc ~]# cat /proc/version
Linux version 3.10.0-327.18.2.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu May 12 11:03:55 UTC 2016

方法4：

（32位的系统中int类型和long类型一般都是4字节，64位的系统中int类型还是4字节的，但是long已变成了8字节inux系统中可用"getconf WORD_BIT"和
"getconf LONG_BIT"获得word和long的位数。64位系统中应该分别得到32和64。）

[root@linuxidc ~]# getconf LONG_BIT
64

查看系统版本

方法1：《这个命令试过不好用》

[root@linuxidc ~]# lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 7.2.1511 (Core)
Release: 7.2.1511
Codename: Core

方法2：

[root@linuxidc ~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel Fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
RedHat_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

方法3：

[root@linuxidc ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)

方法4：

[root@linuxidc ~]# rpm -q centos-release
centos-release-7-2.1511.el7.centos.2.10.x86_64

方法5：查看系统版本

cat /etc/redhat-release

这里写图片描述

查看内核版本

方法1：

[root@linuxidc ~]# cat /proc/version
Linux version 3.10.0-327.18.2.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu May 12 11:03:55 UTC 2016

方法2：

[root@linuxidc ~]# uname -a

Linux linuxidc 3.10.0-327.18.2.el7.x86_64 #1 SMP Thu May 12 11:03:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

更多CentOS相关信息见CentOS 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=14

1.系统

1.1版本

uname -a 能确认是64位还是32位，其它的信息不多

[html] view plain copy

[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

more /etc/*release 可以看到更多信息

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[root@localhost ~]# more /etc/*release
::::::::::::::
/etc/centos-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core)
::::::::::::::
/etc/os-release
::::::::::::::
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
::::::::::::::
/etc/redhat-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core)
::::::::::::::
/etc/system-release
::::::::::::::
CentOS Linux release 7.2.1511 (Core)

1.2核数

cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

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[root@localhost ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
1 Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz

1个逻辑CPU，i5型等信息[html] view plain copy

[root@localhost ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
8 Intel(R) Xeon(R) CPU E7-4820 v2 @ 2.00GHz

8个逻辑CPU

cat /proc/cpuinfo | grep physical | uniq -c

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[root@localhost ~]# cat /proc/cpuinfo | grep physical | uniq -c
1 physical id : 0
1 address sizes : 42 bits physical, 48 bits virtual

实际上是一颗一核的CPU[html] view plain copy

[root@localhost ~]# cat /proc/cpuinfo | grep physical | uniq -c
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual
1 physical id : 0
1 address sizes : 40 bits physical, 48 bits virtual

由8个1核的CPU组成8核

cat /proc/cpuinfo可以看到更为详细的信息

[html] view plain copy

[root@localhost ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 94
model name : Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz
stepping : 3
microcode : 0x74
cpu MHz : 2304.004
cache size : 6144 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm hwp hwp_noitfy hwp_act_window hwp_epp fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 invpcid rtm rdseed adx smap xsaveopt xsavec xgetbv1 xsaves
bogomips : 4608.00
clflush size : 64
cache_alignment : 64
address sizes : 42 bits physical, 48 bits virtual
power management:

1.3运行模式

getconf LONG_BIT CPU运行在多少位模式下[html] view plain copy

[root@localhost ~]# getconf LONG_BIT
64

如果是32，说明当前CPU运行在32bit模式下, 但不代表CPU不支持64bit

cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l 是否支持64位

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[root@localhost ~]# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l
1

结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit

1.4计算机名

hostname

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[root@localhost ~]# hostname
localhost.localdomain

1.5.查看环境变量

env

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[root@localhost ~]# env
XDG_SESSION_ID=4
HOSTNAME=localhost.localdomain
SELINUX_ROLE_REQUESTED=
TERM=vt100
SHELL=/bin/bash
HISTSIZE=1000
SSH_CLIENT=192.168.174.1 58896 22
SELINUX_USE_CURRENT_RANGE=
SSH_TTY=/dev/pts/0
USER=root

1.6系统允许多长时间了/负载数

uptime

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[root@localhost proc]# uptime
10:55:01 up 1:28, 2 users, load average: 0.00, 0.01, 0.05

1.当前时间10:55:01

2.系统运行了多少时间,1:28（1小时28分)

3.多少个用户,2 users

4.平均负载：0.00, 0.01, 0.05，最近1分钟、5分钟、15分钟系统的负载

直接查看平均负载情况 cat /proc/loadavg

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[root@localhost proc]# cat /proc/loadavg
0.00 0.01 0.05 4/524 7152

除了前3个数字表示平均进程数量外，后面的1个分数，分母表示系统进程总数，分子表示正在运行的进程数；最后一个数字表示最近运行的进程ID

2.资源

2.1内存

cat /proc/meminfo内存的详细信息

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[root@localhost proc]# cat /proc/meminfo
MemTotal: 1001332 kB
MemFree: 99592 kB
MemAvailable: 420940 kB
Buffers: 1064 kB
Cached: 405292 kB
SwapCached: 0 kB
Active: 412548 kB
Inactive: 250192 kB
Active(anon): 205264 kB
Inactive(anon): 58460 kB
Active(file): 207284 kB
Inactive(file): 191732 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2097148 kB
SwapFree: 2097140 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 256416 kB
Mapped: 103344 kB
Shmem: 7340 kB
Slab: 126408 kB
SReclaimable: 69912 kB
SUnreclaim: 56496 kB
KernelStack: 10416 kB
PageTables: 15520 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 2597812 kB
Committed_AS: 1578872 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 170756 kB
VmallocChunk: 34359564288 kB
HardwareCorrupted: 0 kB
AnonHugePages: 75776 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 73600 kB
DirectMap2M: 974848 kB
DirectMap1G: 0 kB

MemTotal总内存，MemFree可用内存
free -m(-m，单位是m，如果是-g，单位是g）查看可用内存[html] view plain copy

[root@localhost proc]# free -m
total used free shared buff/cache available
Mem: 977 360 97 7 520 411
Swap: 2047 0 2047

空闲内存total-used=free+buff/cache

3.磁盘和分区

3.1查看各分区使用情况

df -h

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[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 45G 22G 24G 48% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 96K 921M 1% /dev/shm
tmpfs 921M 1004K 920M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 497M 195M 303M 40% /boot
tmpfs 185M 0 185M 0% /run/user/1001
tmpfs 185M 0 185M 0% /run/user/0
[root@localhost ~]#

3.2查看指定目录的大小

du -sh <目录名>

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[root@localhost ~]# du -sh /root
1.2G /root

3.3查看所有分区

fdisk -l

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[root@localhost proc]# fdisk -l
磁盘 /dev/sda：32.2 GB, 32212254720 字节，62914560 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0x000a0cd4
设备 Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 62914559 30944256 8e Linux LVM
磁盘 /dev/mapper/centos-root：29.5 GB, 29490151424 字节，57597952 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘 /dev/mapper/centos-swap：2147 MB, 2147483648 字节，4194304 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘 /dev/mapper/centos-docker--poolmeta：33 MB, 33554432 字节，65536 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘 /dev/mapper/docker-253:0-101330881-pool：107.4 GB, 107374182400 字节，209715200 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：65536 字节 / 65536 字节

3.4查看所有交换分区

swapon -s

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[root@localhost proc]# swapon -s
文件名类型大小已用权限
/dev/dm-1 partition 2097148 8 -1

4.网络

4.1查看所有网络接口的属性

ifconfig

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[root@localhost proc]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 0.0.0.0
ether 02:42:e1:b8:a5:4f txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.174.129 netmask 255.255.255.0 broadcast 192.168.174.255
inet6 fe80::20c:29ff:fe50:b3b4 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:50:b3:b4 txqueuelen 1000 (Ethernet)
RX packets 28649 bytes 38411280 (36.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8937 bytes 1226914 (1.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 4 bytes 340 (340.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4 bytes 340 (340.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 00:00:00:00:00:00 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

4.2 带宽

ethtool 网卡名
[plain] view plain copy

[root@localhost php-tomcat-base]# ethtool ens192
Settings for ens192:
Supported ports: [ TP ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: No
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
<span style="color:#ff0000;">Speed: 10000Mb/s</span>
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
MDI-X: Unknown
Supports Wake-on: uag
Wake-on: d
Link detected: yes

看Speed

4.3查看路由表

route -n

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[root@localhost proc]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.174.2 0.0.0.0 UG 100 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
192.168.174.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
[root@localhost proc]#

4.4查看所有监听端口

netstat -lntp
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[root@localhost ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 743/rpcbind
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1740/nginx: master
tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 1740/nginx: master
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 2194/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1543/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 12610/cupsd
tcp 0 0 0.0.0.0:40536 0.0.0.0:* LISTEN 19964/rpc.statd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2133/master
tcp6 0 0 :::111 :::* LISTEN 743/rpcbind
tcp6 0 0 :::81 :::* LISTEN 1740/nginx: master
tcp6 0 0 :::22 :::* LISTEN 1543/sshd
tcp6 0 0 ::1:631 :::* LISTEN 12610/cupsd
tcp6 0 0 ::1:25 :::* LISTEN 2133/master
tcp6 0 0 :::35420 :::* LISTEN 19964/rpc.statd
[root@localhost ~]#

4.5查看所有已经建立的连接

netstat -antp

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[root@localhost ~]# netstat -antp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 743/rpcbind
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1740/nginx: master
tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 1740/nginx: master
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 2194/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1543/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 12610/cupsd
tcp 0 0 0.0.0.0:40536 0.0.0.0:* LISTEN 19964/rpc.statd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2133/master
tcp 0 0 172.31.4.233:22 121.34.147.13:57190 ESTABLISHED 29540/sshd: cavan [
tcp 0 0 172.31.4.233:22 121.34.147.13:54544 ESTABLISHED 27077/sshd: cavan [
tcp 0 96 172.31.4.233:22 219.137.32.66:60645 ESTABLISHED 30315/sshd: root@pt
tcp 0 0 172.31.4.233:22 121.34.147.13:56319 ESTABLISHED 28703/sshd: cavan [
tcp6 0 0 :::111 :::* LISTEN 743/rpcbind
tcp6 0 0 :::81 :::* LISTEN 1740/nginx: master
tcp6 0 0 :::22 :::* LISTEN 1543/sshd
tcp6 0 0 ::1:631 :::* LISTEN 12610/cupsd
tcp6 0 0 ::1:25 :::* LISTEN 2133/master
tcp6 0 0 :::35420 :::* LISTEN 19964/rpc.statd
[root@localhost ~]#

4.6 某端口使用情况

lsof -i:端口号

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[root@localhost mysql]# lsof -i:22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 1150 root 3u IPv4 18264 0t0 TCP *:ssh (LISTEN)
sshd 1150 root 4u IPv6 18273 0t0 TCP *:ssh (LISTEN)
sshd 2617 root 3u IPv4 20437 0t0 TCP localhost.localdomain:ssh->192.168.174.1:60426 (ESTABLISHED)
[root@localhost mysql]#

或者

netstat -apn|grep 端口号

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[root@localhost mysql]# netstat -apn|grep 22
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1150/sshd
tcp 0 96 192.168.174.136:22 192.168.174.1:60426 ESTABLISHED 2617/sshd: root@pts
tcp6 0 0 :::22 :::* LISTEN 1150/sshd

5.进程

5.1查看所有进程

ps -ef,使用ps -ef|gerp tomcat过滤

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[root@localhost ~]# ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 09:26 ? 00:00:03 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root 2 0 0 09:26 ? 00:00:00 [kthreadd]
root 3 2 0 09:26 ? 00:00:00 [ksoftirqd/0]
root 6 2 0 09:26 ? 00:00:00 [kworker/u256:0]
root 7 2 0 09:26 ? 00:00:00 [migration/0]
root 8 2 0 09:26 ? 00:00:00 [rcu_bh]
root 9 2 0 09:26 ? 00:00:00 [rcuob/0]
root 10 2 0 09:26 ? 00:00:00 [rcuob/1]
root 11 2 0 09:26 ? 00:00:00 [rcuob/2]
root 12 2 0 09:26 ? 00:00:00 [rcuob/3]
root 13 2 0 09:26 ? 00:00:00 [rcuob/4]
root 14 2 0 09:26 ? 00:00:00 [rcuob/5]
root 15 2 0 09:26 ? 00:00:00 [rcuob/6]
root 16 2

ps -aux可以看到进程占用CPU,内存情况

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[root@localhost ~]# ps -aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.6 126124 6792 ? Ss 09:26 0:03 /usr/lib/systemd/systemd --switched-root --system --deserialize 21
root 2 0.0 0.0 0 0 ? S 09:26 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S 09:26 0:00 [ksoftirqd/0]
root 6 0.0 0.0 0 0 ? S 09:26 0:00 [kworker/u256:0]
root 7 0.0 0.0 0 0 ? S 09:26 0:00 [migration/0]
root 8 0.0 0.0 0 0 ? S 09:26 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? S 09:26 0:00 [rcuob/0]
root 10 0.

5.2实时显示进程状态

top

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[root@localhost ~]# top
top - 11:29:02 up 2:02, 2 users, load average: 0.12, 0.04, 0.05
Tasks: 408 total, 2 running, 406 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.3 us, 0.3 sy, 0.0 ni, 98.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 1001332 total, 92184 free, 370332 used, 538816 buff/cache
KiB Swap: 2097148 total, 2097140 free, 8 used. 419124 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3001 gdm 20 0 1419364 122996 45860 S 1.0 12.3 0:06.50 gnome-shell
276 root 20 0 0 0 0 S 0.3 0.0 0:09.72 kworker/0:1
3765 root 20 0 142864 5128 3876 S 0.3 0.5 0:00.77 sshd
7740 root 20 0 146452 2384 1432 R 0.3 0.2 0:00.17 top
1 root 20 0 126124 6792 3912 S 0.0 0.7 0:03.58 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.03 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.37 ksoftirqd/0
6 root 20 0 0 0 0 S 0.0 0.0 0:00.39 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

6.用户

6.1查看活动用户

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[root@localhost ~]# w
11:32:36 up 72 days, 20:50, 3 users, load average: 0.00, 0.01, 0.05
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
cavan pts/0 121.34.147.13 09:47 1:14m 0.17s 0.17s sshd: cavan [priv]
root pts/1 219.137.32.66 11:19 4.00s 0.05s 0.00s w
cavan pts/3 121.34.147.13 10:14 20:44 0.38s 0.11s vim Dockerfile
[root@localhost ~]#

6.2查看指定用户的信息

id <用户名>

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[root@localhost ~]# id root
uid=0(root) gid=0(root) groups=0(root)
[root@localhost ~]# id cavan
uid=1001(cavan) gid=1001(cavan) groups=1001(cavan)
[root@localhost ~]#

6.3查看用户登录日志

last

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[root@localhost 1]# last
root pts/0 192.168.174.1 Mon Oct 24 09:51 still logged in
(unknown :0 :0 Mon Oct 24 09:27 still logged in
reboot system boot 3.10.0-327.el7.x Mon Oct 24 09:26 - 11:35 (02:09)
root pts/0 192.168.174.1 Fri Oct 21 09:41 - 18:44 (09:03)
(unknown :0 :0 Fri Oct 21 09:15 - 18:44 (09:28)
reboot system boot 3.10.0-327.el7.x Fri Oct 21 09:15 - 11:35 (3+02:20)
root pts/1 192.168.174.1 Thu Oct 20 10:05 - 18:13 (08:08)
root pts/0

6.4查看系统所有用户

cut -d: -f1 /etc/passwd

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[root@localhost ~]# cut -d: -f1 /etc/passwd
root
bin
daemon
adm
lp
sync
shutdown
halt
mail
operator
games
ftp
nobody
dbus
polkitd
abrt
unbound
colord
usbmuxd
ntp

https://blog.csdn.net/u012841092/article/details/73920648

CentOS查看系统信息

一：查看CPU

more /proc/cpuinfo | grep "model name"

grep "model name" /proc/cpuinfo

如果觉得需要看的更加舒服

grep "model name" /proc/cpuinfo | cut -f2 -d:

怎么样，linux的命令就要这样熟悉。

# 总核数 = 物理CPU个数 X 每颗物理CPU的核数
# 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数

# 查看物理CPU个数
cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

# 查看每个物理CPU中core的个数(即核数)
cat /proc/cpuinfo| grep "cpu cores"| uniq

# 查看逻辑CPU的个数
cat /proc/cpuinfo| grep "processor"| wc -l

二：查看内存

grep MemTotal /proc/meminfo

grep MemTotal /proc/meminfo | cut -f2 -d:

free -m |grep "Mem" | awk '{print $2}'

三：查看cpu是32位还是64位

查看CPU位数(32 or 64)

#getconf LONG_BIT

#echo $HOSTTYPE

#uname -a

四：查看当前linux的版本

#more /etc/RedHat-release

#cat /etc/redhat-release

五：查看内核版本

#uname -r

#uname -a

六：查看当前时间

date

七：查看硬盘和分区

df -h

fdisk -l

也可以查看分区

du -sh

可以看到全部占用的空间

du /etc -sh

可以看到这个目录的大小

八：查看安装的软件包

查看系统安装的时候装的软件包

cat -n /root/install.log

more /root/install.log | wc -l

查看现在已经安装了那些软件包

rpm -qa

rpm -qa | wc -l

yum list installed | wc -l

不过很奇怪，我通过rpm，和yum这两种方式查询的安装软件包，数量并不一样。没有找到原因。

九：查看键盘布局

cat /etc/sysconfig/keyboard

cat /etc/sysconfig/keyboard | grep KEYTABLE | cut -f2 -d=

十：查看selinux情况

sestatus

sestatus | cut -f2 -d:

cat /etc/sysconfig/selinux

十一：查看ip，mac地址

在ifcfg-eth0 文件里你可以看到mac，网关等信息。

ifconfig

cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR

cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR | cut -f2 -d=

ifconfig eth0 |grep "inet addr:" |awk '{print $2}'|cut -c 6-

ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'

查看网关

cat /etc/sysconfig/network

查看dns

cat /etc/resolv.conf

十二：查看默认语言

echo $LANG $LANGUAGE

cat /etc/sysconfig/i18n

十三：查看所属时区和是否使用UTC时间

cat /etc/sysconfig/clock

十四：查看主机名

hostname

cat /etc/sysconfig/network

修改主机名就是修改这个文件，同时最好也把host文件也修改

centOS7下实践查询版本/CPU/内存/硬盘容量等硬件信息

https://www.cnblogs.com/zy-plan/p/8617202.html

1.系统

1.1版本

1.2核数

1.3运行模式

1.4计算机名

1.5.查看环境变量

1.6系统允许多长时间了/负载数

2.资源

2.1内存

3.磁盘和分区

3.1查看各分区使用情况

3.2查看指定目录的大小

3.3查看所有分区

3.4查看所有交换分区

4.网络

4.1查看所有网络接口的属性

4.2 带宽

4.3查看路由表

4.4查看所有监听端口

4.5查看所有已经建立的连接

4.6 某端口使用情况

5.进程

5.1查看所有进程

5.2实时显示进程状态

6.用户

6.1查看活动用户

6.2查看指定用户的信息

6.3查看用户登录日志

6.4查看系统所有用户

前言

辨识标准

查看位数命令

查看系统版本

查看内核版本

1.系统

1.1版本

1.2核数

1.3运行模式

1.4计算机名

1.5.查看环境变量

1.6系统允许多长时间了/负载数

2.资源

2.1内存

3.磁盘和分区

3.1查看各分区使用情况

3.2查看指定目录的大小

3.3查看所有分区

3.4查看所有交换分区

4.网络

4.1查看所有网络接口的属性

4.2 带宽

4.3查看路由表

4.4查看所有监听端口

4.5查看所有已经建立的连接

4.6 某端口使用情况

5.进程

5.1查看所有进程

5.2实时显示进程状态

6.用户

6.1查看活动用户

6.2查看指定用户的信息

6.3查看用户登录日志

6.4查看系统所有用户

https://blog.csdn.net/u012841092/article/details/73920648

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