关于linux:linux-查看系统信息

1:uname

$ uname --help
Usage: uname [OPTION]...
Print certain system information.  With no OPTION, same as -s.

  -a, --all                print all information, in the following order,
                             except omit -p and -i if unknown:
  -s, --kernel-name        print the kernel name
  -n, --nodename           print the network node hostname
  -r, --kernel-release     print the kernel release
  -v, --kernel-version     print the kernel version
  -m, --machine            print the machine hardware name
  -p, --processor          print the processor type or "unknown"
  -i, --hardware-platform  print the hardware platform or "unknown"
  -o, --operating-system   print the operating system
      --help     display this help and exit
      --version  output version information and exit

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'uname invocation'

罕用

# 显示所有
$ uname -a  
# 硬件平台
$ uname -i  
x86_64
# 内核版本号
$ uname -r
3.10.0-229.el7.x86_64
$ uname -v
#1 SMP Fri Mar 6 11:36:42 UTC 2015

2：/proc/version

零碎运行内核版本号以及 gcc 版本号

$ cat /proc/version 
Linux version 3.10.0-229.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.2 20140120 (Red Hat 4.8.2-16) (GCC) ) #1 SMP Fri Mar 6 11:36:42 UTC 2015

3：/proc/cpuinfo

cpu 相干信息

$ cat /proc/cpuinfo 
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 94
model name    : Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz
stepping    : 3
cpu MHz        : 2711.952
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 mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc pni pclmulqdq monitor ssse3 cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx rdrand lahf_lm abm 3dnowprefetch fsgsbase avx2 invpcid rdseed
bogomips    : 5423.90
clflush size    : 64
cache_alignment    : 64
address sizes    : 39 bits physical, 48 bits virtual
power management:

常见命令

# 查看物理 cpu 个数
$ cat /proc/cpuinfo| grep "physical id" |sort | uniq | wc -l
4

# 查看每个物理 cpu 的核数
$ cat /proc/cpuinfo| grep "cpu cores"| uniq
cpu cores    : 1

# 查看逻辑 cpu 个数
$ cat /proc/cpuinfo| grep "processor"| wc -l
4

4: lscpu

Display information about the CPU architecture.

lscpu 从 sysfs 和 /proc/cpuinfo 收集 cpu 体系结构信息，命令的输入比拟易读

$ lscpu 
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 94
Model name:            Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz
Stepping:              3
CPU MHz:               2711.952
BogoMIPS:              5423.90
Hypervisor vendor:     Oracle
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              6144K
NUMA node0 CPU(s):     0
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc pni pclmulqdq monitor ssse3 cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx rdrand lahf_lm abm 3dnowprefetch fsgsbase avx2 invpcid rdseed

5: /proc/meminfo

零碎内存应用情况

free 和 vmstat 等命令返回数据均来自该文件

具体介绍 参考这里

6: free

Display amount of free and used memory in the system

$ free -h
              total        used        free      shared  buff/cache   available
Mem:           3.7G        119M        3.3G        8.5M        296M        3.4G
Swap:          2.0G          0B        2.0G

7:/proc/uptime 和 /proc/loadavg

零碎运行工夫和空间工夫 单位 s

(闲暇工夫可能会是运行工夫的几倍 因为闲暇工夫是所有逻辑 cpu 的闲暇工夫和)

$cat /proc/uptime 
70642.00 282514.43

$ cat /proc/loadavg 
0.00 0.01 0.05 1/170 15387

8：uptime

$ uptime 
 15:22:35 up 19:41,  1 user,  load average: 0.00, 0.01, 0.05

别离示意

• 以后工夫 15:22:35
• 零碎曾经运行工夫 19:41 19 小时 41 分
• 以后在线用户数 1 个用户
• 零碎负载 1 分钟 5 分钟 15 分钟平均值

9：查看零碎发行版

/etc/os-release

$ 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"

lsb_release

$ lsb_release -r
Release:    7.2.1511

该命令默认没有被装置 须要自行装置

/etc/issue

hostnamectl

$ hostnamectl
   Static hostname: localhost.localdomain
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 15ef07d6ca494a7f82fec477fa70b7e4
           Boot ID: 1b607797966a487b8b72944f0ce619c2
    Virtualization: vmware
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-327.el7.x86_64
      Architecture: x86-64