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nginx平滑升级

2014-12-05 10:37 本站整理 浏览(2)

1、概述

Nginx方便地帮助我们实现了平滑升级。其原理简单概括,就是:

(1)在不停掉老进程的情况下,启动新进程。

(2)老进程负责处理仍然没有处理完的请求,但不再接受处理请求。

(3)新进程接受新请求。

(4)老进程处理完所有请求,关闭所有连接后,停止。

这样就很方便地实现了平滑升级。一般有两种情况下需要升级Nginx,一种是确实要升级Nginx的版本,另一种是要为Nginx添加新的模块。

2. 升级过程

具体的操作也很简单,如下:

(0)查看当前版本

在存放Nginx的可执行文件的目录下输入:

./nginx -V

(1)下载新的Nginx版本并编译。

wget nginx-1.0.11.tar.gz

tar zxvf nginx-1.0.11.tar.gz

cd nginx-1.0.11

./configure --add-module=/customized_module_0 --add-module=/customized_module_1

make

注意不要进行make install

(2)备份老版本的可执行文件

cd /usr/local/nginx/sbin

sudo cp nginx nginx.old

(3)修改配置文件

如果有必要的话,进行配置文件的修改。

(4)拷贝新的可执行文件

sudo cp /home/michael/tmp/nginx-1.0.11/objs/nginx /usr/local/nginx/sbin/

(5)升级

cd /home/michael/tmp/nginx-1.0.11

make upgrade

(6)清理多余文件

rm -rf /home/michael/tmp/nginx-1.0.11

(7)查看Nginx版本

cd /usr/local/nginx/sbin

./nginx -V

3、观察进程变化

在我的机器上可以观察到,我配置的是10个worker进程,启动后观察到:

root 6241 10419 0 10:51 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx

nobody 6242 6241 2 10:51 ? 00:00:00 nginx: worker process

nobody 6243 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6244 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6245 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6246 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6247 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6248 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6249 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6250 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6251 6241 1 10:51 ? 00:00:00 nginx: worker process

nobody 6252 6241 0 10:51 ? 00:00:00 nginx: cache manager process

nobody 6253 6241 0 10:51 ? 00:00:00 nginx: cache loader process

luming 6310 25051 0 10:51 pts/1 00:00:00 grep --color=auto nginx

nobody 7995 10419 0 Jan12 ? 00:20:37 nginx: worker process is shutting down

nobody 7996 10419 0 Jan12 ? 00:20:11 nginx: worker process is shutting down

nobody 7998 10419 0 Jan12 ? 00:20:04 nginx: worker process is shutting down

nobody 8003 10419 0 Jan12 ? 00:20:12 nginx: worker process is shutting down

root 10419 1 0 Jan08 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx

可见新的进程有1个master和10个worker,另外还有1个老的master(可以从时间上看出)和4个worker(其他6个老的worker已经处理完所有连接而shutdown了)。还有一个loader进程。过几秒种可以看到worker只有两个了:

root 6241 10419 0 10:51 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx

nobody 6242 6241 1 10:51 ? 00:00:00 nginx: worker process

nobody 6243 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6244 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6245 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6246 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6247 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6248 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6249 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6250 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6251 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6252 6241 0 10:51 ? 00:00:00 nginx: cache manager process

nobody 6253 6241 0 10:51 ? 00:00:00 nginx: cache loader process

luming 6430 25051 0 10:51 pts/1 00:00:00 grep --color=auto nginx

nobody 7996 10419 0 Jan12 ? 00:20:11 nginx: worker process is shutting down

nobody 8003 10419 0 Jan12 ? 00:20:12 nginx: worker process is shutting down

root 10419 1 0 Jan08 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx

再过一小会儿观察:

root 6241 1 0 10:51 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx

nobody 6242 6241 0 10:51 ? 00:00:01 nginx: worker process

nobody 6243 6241 0 10:51 ? 00:00:01 nginx: worker process

nobody 6244 6241 0 10:51 ? 00:00:01 nginx: worker process

nobody 6245 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6246 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6247 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6248 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6249 6241 0 10:51 ? 00:00:00 nginx: worker process

nobody 6250 6241 0 10:51 ? 00:00:01 nginx: worker process

nobody 6251 6241 0 10:51 ? 00:00:02 nginx: worker process

nobody 6252 6241 0 10:51 ? 00:00:00 nginx: cache manager process

luming 8680 25051 0 10:56 pts/1 00:00:00 grep --color=auto nginx

Congratulations! You can upgrade your Nginx server gracefully.

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