Linux下检测性能的常用命令

性能检测命令

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vmstat 1

sar

iostat

netstat -an

nmap -sT -O localhost

uname -r

chkconfig --list

w

du -ms

netstat -n -p -t | grep SYN_RECV | grep :80 | wc -l

ps -aux | grep imap

kill -9 <PID>

killall imapd

 

加入于2006.11.21

less /etc/sysconfig/iptables

less /etc/ssh/sshd_config

less /etc/passwd //look for new user

less /etc/group //look for new group or if have new user in root group

less /etc/rc.d/rc.local

 

Monitor Opening Port

# nmap �CsT �CO localhost

  834/tcp   open  unknown

# cat /etc/services | grep 834 // 查看834 端口是否和任何已知服务相关

# netstat �Canp | grep 834 //p 选项揭示了打开834 端口的进程ID （PID ）

# lsof �Ci | grep 834

 

查找或删除正在使用某文件的进程
fuser filename
fuser -k filename

 

 

yum clear all

yum -y update

    if you find "Error: Cannot find a valid baseurl for repo", try to ping [url]www.centos.org[/url] and check iptables policy. 

  if you find "You may also check that you have the correct GPG keys installed",then:

uname -r

find / -name RPM-GPG-KEY-* //number:version about CentOS

rpm --import /usr/share/doc/CentOS-release-3/RPM-GPG-KEY-centos3

 

 

//change IP address:

vi /etc/sysconfig/network-scripts/ifcfg-eth0

//add default gateway

route add default gw 192.168.18.1 dev eth0