1.安裝配置1.6版本的 nginx
[root@localhost ~]# yum install -y gcc gcc-c++ pcre-devel openssl-devel zlib-devel
[root@localhost ~]# tar xzf nginx-1.6.3.tar.gz -C /usr/local/
[root@localhost ~]# cd /usr/local/nginx-1.6.3
[root@localhost nginx-1.6.3]# ./configure --prefix=/usr/local/nginx --user=nginx -group=nginx --with-http_stub_status_module
[root@localhost nginx-1.6.3]# make && make install
[root@localhost nginx-1.6.3]# useradd -M -s /sbin/nologin nginx
[root@localhost nginx-1.6.3]# /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@localhost nginx-1.6.3]# /usr/local/nginx/sbin/nginx
2.查看版本和模塊
[root@localhost nginx-1.6.3]# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.6.3 built
by gcc 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)
configure arguments: --prefix=/usr/local/nginx --user=nginx --group=nginx --withhttp_stub_status_module
3.訪問(wèn)驗(yàn)證
[root@localhost nginx-1.6.3]# echo "nginx1.6" > /usr/local/nginx/html/index.html
[root@localhost nginx-1.6.3]# yum install -y elinks
[root@localhost nginx-1.6.3]# elinks 10.0.105.189
4.升級(jí)nginx
將 nginx 版本進(jìn)行升級(jí) 并在不影響業(yè)務(wù)的情況下添加 SSL 和 pcre 模塊
[root@localhost ~]# tar xzf nginx-1.12.2.tar.gz -C /usr/local/
[root@localhost ~]# cd /usr/local/nginx-1.12.2/
[root@localhost nginx-1.12.2]# ./configure --prefix=/usr/local/nginx --user=nginx -group=ngiinx --with-http_stub_status_module --with-http_ssl_module --with-pcre
[root@localhost nginx-1.12.2]# make
[root@localhost nginx-1.12.2]# cd
[root@localhost ~]# mv /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx_lod
[root@localhost ~]# cp /usr/local/nginx-1.12.2/objs/nginx /usr/local/nginx/sbin/
[root@localhost ~]# ps -ef | grep nginx
root 6324 1 0 09:06 ? 00:00:00 nginx: master process /usr/local/nginx-1.12.2/sbin/nginx
nobody 6325 6324 0 09:06 ? 00:00:00 nginx: worker process
root 6338 1244 0 09:11 pts/0 00:00:00 grep --color=auto nginx
[root@localhost ~]# kill -USR2 6324 #此時(shí)查看進(jìn)程 給master進(jìn)程發(fā)送一個(gè)熱升級(jí)進(jìn)程信號(hào)
[root@localhost ~]# ls /usr/local/nginx/logs/ #主進(jìn)程將重命名它的進(jìn)程文件 .pid 文件為 .oldbin
access.log error.log nginx.pid nginx.oldbin
[root@localhost ~]# cat /usr/local/nginx/logs/nginx.pid
6340
[root@localhost ~]# ps -ef | grep nginx
root 6324 1 0 09:06 ? 00:00:00 nginx: master process /usr/local/nginx-1.12.2/sbin/nginx
nobody 6325 6324 0 09:06 ? 00:00:00 nginx: worker process
root 6340 6324 0 09:12 ? 00:00:00 nginx: master process /usr/local/nginx-1.12.2/sbin/nginx
nobody 6341 6340 0 09:12 ? 00:00:00 nginx: worker process
root 6343 1244 0 09:12 pts/0 00:00:00 grep --color=auto nginx
在這時(shí)，兩個(gè) nginx 實(shí)例會(huì)同時(shí)運(yùn)行，一起處理輸入的請(qǐng)求。
要逐步停止舊的實(shí)例，你必須發(fā)送 WINCH 信號(hào)給舊的主進(jìn)程，然后，它的工作進(jìn)程就將開(kāi)始從容關(guān)閉
[root@nginx ~]# kill -WINCH 6324
[root@nginx ~]# ps -ef | grep nginx
root 6324 1 0 09:06 ? 00:00:00 nginx: master process /usr/local/nginx-1.12.2/sbin/nginx
root 6340 6324 0 09:12 ? 00:00:00 nginx: master process /usr/local/nginx-1.12.2/sbin/nginx
nobody 6341 6340 0 09:12 ? 00:00:00 nginx: worker process
root 6346 1244 0 09:14 pts/0 00:00:00 grep --color=auto nginx
一段時(shí)間后，舊的工作進(jìn)程處理了所有已連接的請(qǐng)求后退出，就僅由新的工作進(jìn)程來(lái)處理輸入的請(qǐng)求了
老的worker已經(jīng)沒(méi)了，但是老的master還有，是準(zhǔn)備回滾使用的
查看當(dāng)前nginx狀態(tài)
[root@localhost ~]# /usr/local/nginx/sbin/nginx -V
nginx version: nginx/1.12.2
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)
built with OpenSSL 1.0.2k-fips 26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module --with-http_ssl_module --with-pcre
如果在版本升級(jí)完成后，沒(méi)有任何問(wèn)題，需要關(guān)閉老的master進(jìn)程.
5.回滾
老的master進(jìn)程是一直存在，在沒(méi)有手工關(guān)閉前，它是不會(huì)自已關(guān)閉的，這種設(shè)計(jì)是有好處的，好處就是為了升級(jí)新版本后，如果出現(xiàn)問(wèn)題能及時(shí)快速的回滾到上一個(gè)穩(wěn)定版本。
[root@localhost ~]# ps aux | grep nginx
root 12264 0.0 0.0 24860 956 ? Ss 16:31 0:00 nginx: master process /usr/local/nginx/sbin/nginx
root 20083 0.0 0.1 45936 3260 ? S 16:38 0:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx 20084 0.0 0.1 46384 2128 ? S 16:38 0:00 nginx: worker process
root 27488 0.0 0.0 112708 984 pts/0 R+ 16:47 0:00 grep --color=auto nginx
[root@localhost ~]# kill -HUP 12264 #發(fā)送 HUP 信號(hào)給舊的主進(jìn)程 - 它將在不重載配置文件的情況下啟動(dòng)它的工作進(jìn)程
[root@localhost ~]# ps aux | grep nginx
root 12264 0.0 0.0 24860 956 ? Ss 16:31 0:00 nginx: master process /usr/local/nginx/sbin/nginx
root 20083 0.0 0.1 45936 3260 ? S 16:38 0:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx 20084 0.0 0.1 46384 2128 ? S 16:38 0:00 nginx: worker process
nginx 28108 0.0 0.0 25284 1460 ? S 16:47 0:00 nginx: worker process
root 28154 0.0 0.0 112708 980 pts/0 R+ 16:47 0:00 grep --color=auto nginx
[root@localhost ~]# kill -QUIT 20083 #發(fā)送 QUIT 信號(hào)給新的主進(jìn)程，要求其從容關(guān)閉其工作進(jìn)程
[root@localhost ~]# ps aux | grep nginx
root 12264 0.0 0.0 24860 956 ? Ss 16:31 0:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx 28108 0.0 0.0 25284 1460 ? S 16:47 0:00 nginx: worker process
root 28933 0.0 0.0 112708 984 pts/0 R+ 16:48 0:00 grep --color=auto nginx
如果新主進(jìn)程還沒(méi)退出，發(fā)送 TERM 信號(hào)給新的主進(jìn)程，迫使其退出
kill -TERM 20083
如果因?yàn)槟承┰蛐碌墓ぷ鬟M(jìn)程不能退出，向其發(fā)送 KILL 信號(hào)
kill -9 20083
新的主進(jìn)程退出后，舊的主進(jìn)程會(huì)由移除 .oldbin 后綴，恢復(fù)為它的 .pid 文件，這樣，一切就都恢復(fù)到升級(jí)之前了。
[root@localhost ~]# ls /usr/local/nginx/logs/
access.log error.log nginx.pid
[root@localhost ~]# cat /usr/local/nginx/logs/nginx.pid
12264
如果嘗試升級(jí)成功，而你也希望保留新的服務(wù)器時(shí)，發(fā)送 QUIT 信號(hào)給舊的主進(jìn)程使其退出而只留下新的服務(wù)器運(yùn)行：
kill -QUIT 12264
參考：
https://blog.csdn.net/mingongge/article/details/88097055
https://blog.csdn.net/u011085172/article/details/71515745
Nginx重新編譯添加新的模塊
http://www.itdecent.cn/p/0309cb5e7e76
http://www.itdecent.cn/p/695af00ee857
</article>
