centos7.x下环境搭建，二—nginx安装

上篇文章是对mysql的安装，接着上篇文章，这篇文章安装nginx服务

添加yum源

默认情况Centos7中无Nginx的源，最近发现Nginx官网提供了Centos的源地址。因此可以如下执行命令添加源：

rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm

安装Nginx

1. 通过yum search nginx看看是否已经添加源成功。如果成功则执行下列命令安装Nginx。

yum install -y nginx

2. 启动Nginx并设置开机自动运行

systemctl start nginx.service
systemctl enable nginx.service

3. 开启nginx服务后可以直接通过ip访问

http://ip   默认80端口

若无法访问 ，需要在iptable上添加80端口，如果用的阿里云或腾讯云还需要添加安全组

CentOS中iptables防火墙 开放80端口方法

1. 开放端口

iptables -I INPUT -p tcp --dport 80 -j ACCEPT

2. 保存配置

service iptables save

3. 重启防火墙

service iptables restart

4. 查看配置

service iptables status

nginx相关路径

1. /etc/nginx/ 安装路径
2. /usr/share/nginx 部署路径
3. cat /var/log/nginx/error.log 错误日志

问题总结

1. systemctl start nginx启动报错

Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.

执行以下命令查看服务状态

systemctl status nginx 

nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 四 2019-05-30 14:34:48 CST; 1min 35s ago
     Docs: http://nginx.org/en/docs/
  Process: 6051 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)
 Main PID: 1542 (code=killed, signal=KILL)

5月 30 14:34:45 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
5月 30 14:34:46 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
5月 30 14:34:46 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
5月 30 14:34:47 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
5月 30 14:34:47 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
5月 30 14:34:48 iz2ze3bc56k6c8wubzxn9kz systemd[1]: nginx.service: control process exited, code=exited status=1
5月 30 14:34:48 iz2ze3bc56k6c8wubzxn9kz nginx[6051]: nginx: [emerg] still could not bind()
5月 30 14:34:48 iz2ze3bc56k6c8wubzxn9kz systemd[1]: Failed to start nginx - high performance web server.
5月 30 14:34:48 iz2ze3bc56k6c8wubzxn9kz systemd[1]: Unit nginx.service entered failed state.
5月 30 14:34:48 iz2ze3bc56k6c8wubzxn9kz systemd[1]: nginx.service failed.

可以看到以上错误是因为端口被占用的原因

查看nginx服务
ps -ef | grep nginx

杀死进程
pkill -9 nginx

再启动就可以了
systemctl start nginx