故障:网站无法访问

分析:netstat -an查看到大量的80端口进程僵死,重启tomcat.tomcat启动失败,网页依然无法打开.

停止tomcat进程shutdown.sh，停止tomcat后telnet 127.0.0.1 80,发现80端口依然可用。netstat -an|grep 80 查看发现有许多80端口进程在里面，使用kill pid命令终止进程，无用。使用lsof -i :80|grep -v "PID"|awk '{print "kill -9",$2}'命令后所有80端口进程删除。重新启动tomcat，系统正常运行。不过为什么tomcat在关闭时却不能将80端口的进程一并关闭的原因需要分析一下。

[root@gzcourt bin]# netstat -an |grep 80
tcp??????? 0????? 0 ::ffff:127.0.0.1:8005?????? :::*??????????????????????? LIST
EN
tcp??????? 0????? 0 :::8009???????????????????? :::*??????????????????????? LIST
EN
tcp??????? 0????? 0 :::80?????????????????????? :::*??????????????????????? LIST
EN
tcp??????? 0????? 0 :::8080???????????????????? :::*??????????????????????? LIST
EN
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:202.160.179.12:36057 TIME
_WAIT
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:202.160.178.15:39176 TIME
_WAIT
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:55001? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:3516?? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:55037? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:3518?? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:61.135.162.208:57893 TIME
_WAIT
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:210.72.4.122:39196?? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:59.32.124.136:22529? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:55222? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:218.20.57.173:3510?? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:59.32.124.136:22530? ESTA
BLISHED
tcp??????? 0????? 0 ::ffff:172.16.1.153:80????? ::ffff:210.72.4.122:39198?? ESTA
BLISHED
unix? 3????? [ ]???????? STREAM???? CONNECTED???? 6880?? /tmp/.X11-unix/X0
# lsof -i :80|grep -v "PID"|awk '{print "kill -9",$2}'|sh
以上脚本可以清除80端口的进程