Linux系统资源查看

以下Linux系统资源查看命令中,较常用的为vmstat 与 lsof

• vmstat [刷新延时 刷新次数]

 ucm@ucm-Aspire-TC-:~$ vmstat
 procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
  r  b 交换 空闲 缓冲 缓存   si   so    bi    bo   in   cs us sy id wa st
 
 ucm@ucm-Aspire-TC-:~$ 

• dmesg 内核自检信息

 ucm@ucm-Aspire-TC-:~$ dmesg | grep CPU
 [    0.000000] smpboot: Allowing  CPUs,  hotplug CPUs
 [    0.000000] setup_percpu: NR_CPUS: nr_cpumask_bits: nr_cpu_ids: nr_node_ids:
 [    0.000000] SLUB: HWalign=, Order=-, MinObjects=, CPUs=, Nodes=
 [    0.000000]     RCU restricting CPUs from NR_CPUS= to nr_cpu_ids=.
 [    0.006228] CPU: Physical Processor ID:
 [    0.006228] CPU: Processor Core ID:
 [    0.006229] mce: CPU supports  MCE banks
 [    0.167668] smpboot: CPU0: AMD FX(tm)- Six-Core Processor (family: 0x15, model: 0x2, stepping: 0x0)
 [    0.168386] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
 [    0.168474] .... node  #, CPUs:      # # # # #
 [    0.182597] x86: Booted up  node,  CPUs
 [    1.579348] ledtrig-cpu: registered to indicate activity on CPUs
 [    1.580211] microcode: CPU0: patch_level=0x0600081f
 [    1.580215] microcode: CPU1: patch_level=0x0600081f
 [    1.580222] microcode: CPU2: patch_level=0x0600081f
 [    1.580228] microcode: CPU3: patch_level=0x0600081f
 [    1.580236] microcode: CPU4: patch_level=0x0600081f
 [    1.580244] microcode: CPU5: patch_level=0x0600081f
 ucm@ucm-Aspire-TC-:~$ 

• free　　查看内存
• cat /proc/cpuinfo　　查看CPU信息
• uptime　　查看系统启动时间与平均负载
• uname [option]

options:

　　-a　　查看系统所有的相关信息　　

　　-r　　查看内核版本

　　-s　　查看内核名称

 ucm@ucm-Aspire-TC-:~$ uname -a
 Linux ucm-Aspire-TC- 4.8.--generic #-Ubuntu SMP Fri Nov  :: UTC  x86_64 x86_64 x86_64 GNU/Linux
 ucm@ucm-Aspire-TC-:~$ uname -r
 4.8.--generic
 ucm@ucm-Aspire-TC-:~$ uname -s
 Linux
 ucm@ucm-Aspire-TC-:~$ 

• 判断系统位数

file 外部命令,会显示该命令是多少位的命令,进而知道系统位数.

 ucm@ucm-Aspire-TC-:~$ file /bin/ls
 /bin/ls: ELF -bit LSB executable, x86-, version  (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-.so., for GNU/Linux 2.6., BuildID[sha1]=eca98eeadafddff44caf37ae3d4b227132861218, stripped
 ucm@ucm-Aspire-TC-:~$ 

• 系统发行版

 ucm@ucm-Aspire-TC-:~$ lsb_release -a
 No LSB modules are available.
 Distributor ID:    Ubuntu
 Description:    Ubuntu 16.10
 Release:    16.10
 Codename:    yakkety
 ucm@ucm-Aspire-TC-:~$ 

• 列出系统打开或使用的文件信息

lsof [option]

options:

　　-c 字符串 只列出以字符串开头的进程打开的文件

　　-u 用户名 只列出某个用户的进程打开的文件

　　-p PID 列出某个PID进程打开的文件

eg:

查询系统中所有进程调用的文件

ucm@ucm-Aspire-TC-606:~$ lsof | more

查询某个系统文件被哪个进程调用

ucm@ucm-Aspire-TC-606:~$ lsof /sbin/init
COMMAND  PID USER  FD   TYPE DEVICE SIZE/OFF     NODE NAME
systemd 1280  ucm txt    REG    8,1  1038896 11276594 /lib/systemd/systemd
ucm@ucm-Aspire-TC-606:~$

查看httpd进程调用啦哪些文件

ucm@ucm-Aspire-TC-606:~$ lsof -c httpd

按照用户名,查询某个用户的进程调用的文件名

ucm@ucm-Aspire-TC-606:~$ lsof -u root