Centos7-Nginx编译安装，nginx: [emerg] still could not bind()启动失败-Linux

1.nginx.org官网下载最新版本nginx，并解压源码包。

#下载
wget http://nginx.org/download/nginx-1.17.8.tar.gz  

#解压 
tar xf nginx-1.17.8.tar.gz

2.安装依赖工具

yum install gcc automake pcre-devel openssl-devel zlib-devel

3. ./configure配置（在源码包目录下操作），自定义安装路径

./configure --prefix=/usr/local/nginx

4.make，编译链接、生成二进制文件

make

5.make install,将编译好的相关文件拷贝到指定的安装目录中

make install

6.安装完成

7.将可执行文件路径添加到PATH（方便启动nginx）

vim ~/.bashrc 

#在bashrc配置文件末尾追加nginx守护进程的路径
export PATH=$PATH:/usr/local/nginx/sbin

#保存退出后使配置文件生效
source ~/.bashrc

8.启动nginx

#启动失败
[root@server /]# nginx
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] still could not bind()

#查看80端口是否被占用
[root@server /]# usr/sbin/lsof -i :80
COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
httpd    1326   root    4u  IPv6  26961      0t0  TCP *:http (LISTEN)
httpd   10589 apache    4u  IPv6  26961      0t0  TCP *:http (LISTEN)
httpd   10591 apache    4u  IPv6  26961      0t0  TCP *:http (LISTEN)
httpd   10593 apache    4u  IPv6  26961      0t0  TCP *:http (LISTEN)
httpd   10594 apache    4u  IPv6  26961      0t0  TCP *:http (LISTEN)
httpd   10595 apache    4u  IPv6  26961      0t0  TCP *:http (LISTEN)

#关闭httpd服务
[root@server /]# systemctl stop httpd

#成功启动
[root@server /]# nginx

9.浏览器输入主机的IP地址查看nginx主页（使用了默认端口80，所有可以不输入端口）