linux打开80端口及80端口占用解决办法

linux打开80端口
天客户那边有台服务器同一个局域网中都无法访问，排除lamp环境问题，发现时服务器中的防火墙没有开启80端口。

代码如下 复制代码
vi /etc/sysconfig/iptables
-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT（允许80端口通过防火墙）
-A INPUT -m state –state NEW -m tcp -p tcp –dport 3306 -j ACCEPT（允许3306端口通过防火墙）

按照这种方法测试，发现重启防火墙的时候，回报这两行错误。
[root@localhost ~]# /etc/init.d/iptables restart
iptables：清除防火墙规则： [确定]
iptables：将链设置为政策 ACCEPT：filter [确定]
iptables：正在卸载模块： [确定]
iptables：应用防火墙规则：Bad argument `–-state'
Error occurred at line: 11
Try `iptables-restore -h' or 'iptables-restore --help' for more information.
[失败]

发现这种方法并不好使，于是尝试另外一种，通过命令去添加端口的方法。
代码如下 复制代码
[root@centos httpd]# /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
[root@centos httpd]# /etc/rc.d/init.d/iptables save
[root@centos httpd]# /etc/init.d/iptables restart
这样就搞定了，查看效果
代码如下 复制代码
[root@centos httpd]# /etc/init.d/iptables status

Linux下启动apache报错：80端口已占用解决办法

apache启动报错(98)Address already in use: make_sock: could not bind to address [::]:80
# /etc/init.d/httpd start
Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
[FAILED]
代码如下 复制代码
1.netstat -lnp|grep 80
tcp 0 0 192.168.180.68:61027 0.0.0.0:* LISTEN 6289/oproxyd
tcp 0 0 :::80 :::* LISTEN 846/httpd
tcp 0 0 ::ffff:192.168.180.68:7001 :::* LISTEN 32015/java
找到pid 846
#ps 846
查看
#kill -9 846
杀掉
#./apachectl start
启动成功
*****************************************************************************
处理办法:
代码如下 复制代码
# ps -aux | grep http
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
root 12079 0.0 0.0 61164 720 pts/1 S+ 16:06 0:00 grep http
# ps -aux | grep apache
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
apache 10820 0.0 0.0 2044 600 ? Ss Jan01 0:04 bash
root 12081 0.0 0.0 61160 716 pts/1 S+ 16:06 0:00 grep apache
# kill -9 10820
# /etc/init.d/httpd start
Starting httpd: [ OK ]
# /etc/init.d/httpd restart
Stopping httpd: [ OK ]