开机后查看端口
[root@qiangqiang ~]# netstat -tulnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 2249/sshd
tcp 0 0 0.0.0.0:59163 0.0.0.0:* LISTEN 1596/rpc.statd
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2358/mysqld
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 2072/memcached
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1486/rpcbind
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1891/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1646/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1977/master
tcp 0 0 ::1:6010 :::* LISTEN 2249/sshd
tcp 0 0 :::52071 :::* LISTEN 1596/rpc.statd
tcp 0 0 :::11211 :::* LISTEN 2072/memcached
tcp 0 0 :::111 :::* LISTEN 1486/rpcbind
tcp 0 0 :::22 :::* LISTEN 1891/sshd
tcp 0 0 ::1:631 :::* LISTEN 1646/cupsd
udp 0 0 0.0.0.0:68 0.0.0.0:* 1643/dhclient
udp 0 0 0.0.0.0:11211 0.0.0.0:* 2072/memcached
udp 0 0 0.0.0.0:111 0.0.0.0:* 1486/rpcbind
udp 0 0 0.0.0.0:631 0.0.0.0:* 1646/cupsd
udp 0 0 0.0.0.0:48266 0.0.0.0:* 1596/rpc.statd
udp 0 0 127.0.0.1:924 0.0.0.0:* 1596/rpc.statd
udp 0 0 0.0.0.0:813 0.0.0.0:* 1486/rpcbind
udp 0 0 :::11211 :::* 2072/memcached
udp 0 0 :::55258 :::* 1596/rpc.statd
udp 0 0 :::111 :::* 1486/rpcbind
udp 0 0 :::813 :::* 1486/rpcbind
发现端口没开，检测语法是否错误
[root@qiangqiang ~]# vim /usr/local/apache2/etc/httpd.conf
[root@qiangqiang ~]# apachectl -t
Syntax OK
用开机自启方式打开apache，发现错误
[root@qiangqiang ~]# /usr/local/apache2/bin/apachectl start
httpd: Syntax error on line 503 of /usr/local/apache2/etc/httpd.conf: </IfModule> without matching <IfModule> section
错误是缺少模块头<IfModule>
从配置文件备份版找到模块头填入
<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>
重启开机后，端口打开
[root@qiangqiang ~]# reboot
Broadcast message from root@qiangqiang
(/dev/pts/0) at 7:17 ...
The system is going down for reboot NOW!
[root@qiangqiang ~]# netstat -tulnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 2592/sshd
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2357/mysqld
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 2073/memcached
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1486/rpcbind
tcp 0 0 0.0.0.0:48723 0.0.0.0:* LISTEN 1596/rpc.statd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1891/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1646/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1977/master
tcp 0 0 ::1:6010 :::* LISTEN 2592/sshd
tcp 0 0 :::44422 :::* LISTEN 1596/rpc.statd
tcp 0 0 :::11211 :::* LISTEN 2073/memcached
tcp 0 0 :::111 :::* LISTEN 1486/rpcbind
tcp 0 0 :::80 :::* LISTEN 2360/httpd
tcp 0 0 :::22 :::* LISTEN 1891/sshd
tcp 0 0 ::1:631 :::* LISTEN 1646/cupsd
成功成功
