2015/04/15 Daily System Management

First, monitoring system status

[Email protected] ~]# W

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6B/7B/wKiom1Uuf7mTOoTvAACUm2vvoNw058.jpg "title=" 1.png " alt= "Wkiom1uuf7mtootvaacum2vvonw058.jpg"/>

10:36:52 = Current time of the system;

Up 11:47 = To run for 0 days and 11 hours;

1 user = 1 users are currently logged in;

Load average = loads;

The first 0.00 indicates how many processes use the CPU in 1 minutes, and the load is too high when the number is larger than the CPU box;

The second 0.00 indicates how many processes use the CPU in 5 minutes, and the load is too high when the number is larger than the CPU box;

The third 0.00 indicates how many processes use the CPU in 15 minutes, and the load is too high when the number is larger than the CPU box;

from = = Login IP;

[Email protected] ~]# Vmstat 1 #每秒钟显示一次, showing 10 ends;

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6B/77/wKioL1UugR-S8wXsAAIjIHiuoOw351.jpg "title=" 2.png " alt= "Wkiol1uugr-s8wxsaaijihiuoow351.jpg"/>

650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "spacer.gif"/>r = number of processes that run and wait for CPU time slices, if long is larger than the number of server CPUs, it indicates that the CPU is not enough.

b = Indicates the number of processes waiting for the resource, such as waiting for I/O, memory, etc. If the value of this column is less than 1 for a long time, you need to pay attention to it;

Si = The amount of memory entered by the swap area;

so = the amount of memory to enter the swap area;

BI = The amount of data read from a block device (read disk);

Bo = amount of data written from a block device (write disk);

in = number of interrupts per second, including clock terminals;

CS = The number of context switches per second;

WA = Indicates the percentage of CPU time consumed by I/O waits;

[[email protected] ~]# ab-n 10000-c ' URL '

AB + Apache self-brought pressure test tool;

-N-= Request 10,000 times;

-C + = 100 per concurrent;

[email protected] ~]# top #动态监控进程所占用系统资源

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6B/7B/wKiom1Uuf9ajWez3AAH9bdiFpS4246.jpg "title=" 3.png " alt= "Wkiom1uuf9ajwez3aah9bdifps4246.jpg"/>

Tasks = Total number of processes

1 running = number of running processes

Sleeping = number of dormant processes

0 stopped = Stop process count

0 Zombie = Zombie Process number

Display the number of CPU boxes by the number ' 1 ';

Press Shitf+m to view memory utilization;

[Email protected] ~]# top-c #显示完整的COMMAND; [Email protected] ~]# TOP-BN1 #查看完top自动退出; [Email protected] ~]# ps-l

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6B/77/wKioL1UugUSD2VJ8AACilRcdu-g176.jpg "title=" 4.png " alt= "Wkiol1uugusd2vj8aacilrcdu-g176.jpg"/>

[Email protected] ~]# Ps-aux | Head-5 #查看进程

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6B/7B/wKiom1Uuf_iBKqDiAAE1JztWai8587.jpg "title=" 5.png " alt= "Wkiom1uuf_ibkqdiaae1jztwai8587.jpg"/>

PID = PID, this ID is very useful, in Linux kernel management process relies on the PID to identify and manage a process, such as I want to terminate a process, then kill PID, sometimes killed, then use kill-9 pid.

STAT = Indicates the status of the process, and the process is divided into the following

D: A process that cannot be interrupted (usually I/O)

R: Running Process

S: The process has been interrupted and most of the processes in the system are in this state

T: A process that has been stopped or paused

X: A process that has died

Z: Zombie process, can not kill, killed the garbage process, the system a small resource, but it does not matter, if too many problems

<: high-priority process

N: Low-priority process

L: Memory is locked in memory paging

S: Main thread

L: Multithreaded Process

+: Process in the foreground

[Email protected] ~]# free-m #查看系统内存使用情况

Free in K,-M in M,-G in units

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6B/7B/wKiom1UugAGxDC3JAACcijl8QR8147.jpg "title=" 6.png " alt= "Wkiom1uugagxdc3jaaccijl8qr8147.jpg"/>

MEM (total)-Memory totals

MEM (used) = memory already allocated

MEM (free) = unallocated memory

MEM (buffers) = System allocated but not used buffers

MEM (cached) = System allocated but not used cache

Buffers/cache (user) = The total amount of buffers and caches actually used, as well as the actual memory used

Buffers = = is going to be written to disk

The cache = is read from the disk

[Email protected] ~]# Netstat-an | Head-4 #查看端口

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6B/7B/wKiom1UugAiDasZKAADkH7JOCPM359.jpg "title=" 7.png " alt= "Wkiom1uugaidaszkaadkh7jocpm359.jpg"/>

[Email protected] ~]# yum-y install Sysstat #没有sar则安装此包; [Email protected] ~]# sar-n DEV #查看网卡流量;

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6B/77/wKioL1UugWay3usRAAHEJnIM47M283.jpg "title=" 8.png " alt= "Wkiol1uugway3usraahejnim47m283.jpg"/>

[Email protected] ~]# sar-q #查看历史负载; [Email protected] ~]# Sar-b #查看磁盘读写

This article is from the Chen. "Blog, be sure to keep this provenance http://chenxiaojian.blog.51cto.com/9345444/1633200

2015/04/15 Daily System Management