一、说明
系统：centos 6.6
nginx版本：nginx-1.8.0
二、nginx安装
安装步骤
（1）安装依赖包：gcc，pcre，zlib，openssl
（2）安装nginx-1.8.0
1、安装依赖包：
cd /usr/local
yum install -y gcc gcc-c++
yum install -y pcre pcre-devel
yum install -y zlib zlib-devel
yum install -y openssl openssl-devel2、安装nginx-1.8.0
wget http://nginx.org/download/nginx-1.8.0.tar.gz
tar -zxvf nginx-1.8.0.tar.gz
cd nginx-1.8.0
./configure --user=nobody --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_gzip_static_module --with-http_realip_module --with-http_sub_module --with-http_ssl_module
make install
ls ../
cd ../nginx
cd sbin/
./nginx
ps -ef | grep nginx
root 1821 1 0 00:44 ? 00:00:00 nginx: master process ./nginx
nobody 1822 1821 0 00:44 ? 00:00:00 nginx: worker process
root 1824 1753 0 00:44 pts/0 00:00:00 grep nginx在本机浏览器访问部署nginx的80端口http://...:80，显示图下页面即为部署成功。
至此nginx安装完毕。
3、修改配置文件
需要同时部署2个，
cd /usr/local/nginx/conf
cp nginx nginx.bak
vi nginx
启动异常，报错如下图，检查error.log报错
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:1090 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:8380 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:1090 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:8380 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:1090 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:8380 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:1090 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:8380 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:1090 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: bind() to 0.0.0.0:8380 failed (98: Address already in use)
2018/07/12 17:37:18 [emerg] 5555#0: still could not bind()检查网站的error.log
2018/07/12 01:37:28 [error] 2880#0: *45 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.23.254, server: www.***.cn, request: "GET /favicon.ico HTTP/1.1", upstream: "http://12.1.11.20:8080/*-**/html/*/index.***.ico", host: "192.168.23.22:8380", referrer: "http://192.168.23.22:8380/"
2018/07/12 01:37:28 [error] 2880#0: *45 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.23.254, server: www.***.cn, request: "GET / HTTP/1.1", upstream: "http://12.1.11.20:8080/***/html/**/index.html", host: "192.168.23.22:8380"百度搜索错误
“(111: Connection refused) while connecting to upstream” 用户在连接时，若遇到后端upstream挂掉或者不通，会收到该错误
检查端口调用情况
netstat -ntlp杀掉nginx进程发现，杀掉一次，还有一次，才彻底杀完。
[root@nginx22 nginx]# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1493/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1365/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1597/master
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 5497/sshd
tcp 0 0 0.0.0.0:8380 0.0.0.0:* LISTEN 1821/nginx
tcp 0 0 0.0.0.0:1090 0.0.0.0:* LISTEN 1821/nginx
tcp 0 0 0.0.0.0:49831 0.0.0.0:* LISTEN 1215/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1195/rpcbind
tcp 0 0 :::22 :::* LISTEN 1493/sshd
tcp 0 0 ::1:631 :::* LISTEN 1365/cupsd
tcp 0 0 ::1:25 :::* LISTEN 1597/master
tcp 0 0 ::1:6010 :::* LISTEN 5497/sshd
tcp 0 0 :::58432 :::* LISTEN 1215/rpc.statd
tcp 0 0 :::111 :::* LISTEN 1195/rpcbind
[root@nginx22 nginx]# kill -9 1821
[root@nginx22 nginx]# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1493/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1365/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1597/master
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 5497/sshd
tcp 0 0 0.0.0.0:8380 0.0.0.0:* LISTEN 5529/nginx
tcp 0 0 0.0.0.0:1090 0.0.0.0:* LISTEN 5529/nginx
tcp 0 0 0.0.0.0:49831 0.0.0.0:* LISTEN 1215/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1195/rpcbind
tcp 0 0 :::22 :::* LISTEN 1493/sshd
tcp 0 0 ::1:631 :::* LISTEN 1365/cupsd
tcp 0 0 ::1:25 :::* LISTEN 1597/master
tcp 0 0 ::1:6010 :::* LISTEN 5497/sshd
tcp 0 0 :::58432 :::* LISTEN 1215/rpc.statd
tcp 0 0 :::111 :::* LISTEN 1195/rpcbind
[root@nginx22 nginx]# kill -9 5529
[root@nginx22 nginx]# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1493/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1365/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1597/master
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 5497/sshd
tcp 0 0 0.0.0.0:49831 0.0.0.0:* LISTEN 1215/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1195/rpcbind
tcp 0 0 :::22 :::* LISTEN 1493/sshd
tcp 0 0 ::1:631 :::* LISTEN 1365/cupsd
tcp 0 0 ::1:25 :::* LISTEN 1597/master
tcp 0 0 ::1:6010 :::* LISTEN 5497/sshd
tcp 0 0 :::58432 :::* LISTEN 1215/rpc.statd
tcp 0 0 :::111 :::* LISTEN 1195/rpcbind 测试wget及curl返回值是否正常
[root@nginx22 logs]# netstat -lnt |grep 8180
tcp 0 0 0.0.0.0:8180 0.0.0.0:* LISTEN
[root@nginx22 logs]# wget 127.0.0.1
--2018-07-12 23:14:43-- http://127.0.0.1/
正在连接 127.0.0.1:80... 失败：拒绝连接。
[root@nginx22 logs]# curl 127.0.0.1
curl: (7) couldn't connect to host为什么？
还未解决，待解救。