nginx平滑升级

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1. nginx平滑升级

当我们开发了一个新的nginx模块,须要升级nginx binary时,须要进行下面的步骤:

a) 替换老的nginx binary

[[email protected] sbin]# mv nginx nginx.old
[[email protected] sbin]# scp [email protected]:/usr/local/nginx/sbin/nginx .
[email protected]‘s password:
nginx
b) 向old master process 发送SIGUSR2信号[[email protected] sbin]# kill -s SIGUSR2 16236nginx.pid文件会被重命名为nginx.pid.oldbin,而且执行新的nginx binary文件,此时新老版本号会同一时候执行:
[[email protected] sbin]# ll ../logs/
total 14392
-rw-r--r-- 1 guojun1  500     893 May 30 10:58 error.log
-rw-r--r-- 1 guojun1  500 5617929 May 12 13:12 nginx-access.log
-rw-r--r-- 1 guojun1  500 9102050 May 13 22:39 nginx-error.log
-rw-r--r-- 1 root    root       6 May 30 10:58 nginx.pid
-rw-r--r-- 1 root    root       6 May 30 10:58 nginx.pid.oldbin
[[email protected] sbin]# ps aux | grep nginx
root     16236  0.0  0.0  92920  3064 ?

Ss 10:58 0:00 nginx: master process ./nginx root 16237 0.0 0.0 94992 3988 ? S 10:58 0:00 nginx: worker process root 16238 0.0 0.0 94992 3988 ? S 10:58 0:00 nginx: worker process root 16239 0.0 0.0 94992 3988 ?

S 10:58 0:00 nginx: worker process root 16385 0.0 0.0 92924 6072 ? S 10:58 0:00 nginx: master process ./nginx root 16386 0.0 0.0 94996 3908 ? S 10:58 0:00 nginx: worker process root 16387 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process root 16388 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process root 16445 0.0 0.0 103244 852 pts/4 S+ 10:58 0:00 grep nginx

c) 向old master process发送SIGWINCH此时,master会”优雅地”关闭它的工作进程:
[[email protected] sbin]# kill -s SIGWINCH 16236
[[email protected] sbin]# ps aux | grep nginx
root     16236  0.0  0.0  92920  3072 ?

Ss 10:58 0:00 nginx: master process ./nginx root 16385 0.0 0.0 92924 6072 ?

S 10:58 0:00 nginx: master process ./nginx root 16386 0.0 0.0 94996 3908 ? S 10:58 0:00 nginx: worker process root 16387 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process root 16388 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process

d) 关闭old master假设查看log发送更新成功,能够关闭old master,此时向old master进程发送SIGQUIT,仅仅留下新的server执行。
[[email protected] sbin]# kill -s SIGQUIT 16236
[[email protected] sbin]# ps aux | grep nginx
root     16385  0.0  0.0  92924  6072 ?

S 10:58 0:00 nginx: master process ./nginx root 16386 0.0 0.0 94996 3908 ? S 10:58 0:00 nginx: worker process root 16387 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process root 16388 0.0 0.0 94996 3980 ? S 10:58 0:00 nginx: worker process

2. 回滚

假设我们在关闭老的工作进行之后查看log发现新的nginx server执行有问题,我们能够回滚到老的版本号。其过程例如以下:

a) 启动老的worker 进程能够通过向old master 进程发送SIGHUP信号,让其启动老的worker 进程。

[[email protected] sbin]# ps aux | grep nginx
root     16385  0.0  0.0  92924  6072 ?        S    10:58   0:00 nginx: master process ./nginx
root     44583  0.0  0.0  92924  6076 ?

S 11:57 0:00 nginx: master process ./nginx root 44584 0.0 0.0 94996 3984 ? S 11:57 0:00 nginx: worker process root 44585 0.0 0.0 94996 3984 ? S 11:57 0:00 nginx: worker process root 44586 0.0 0.0 94996 3984 ?

S 11:57 0:00 nginx: worker process root 44757 0.0 0.0 94996 3908 ? S 11:58 0:00 nginx: worker process root 44758 0.0 0.0 94996 3980 ? S 11:58 0:00 nginx: worker process root 44759 0.0 0.0 94996 3980 ?

S 11:58 0:00 nginx: worker process

b) 关闭新的master进程和worker进程向新的master进程发送SIGQUIT信号。关闭新的master进程和worker进程;
[[email protected] sbin]# kill -s SIGQUIT 44583
[[email protected] sbin]# ps aux | grep nginx
root     16385  0.0  0.0  92924  6072 ?        S    10:58   0:00 nginx: master process ./nginx
root     44757  0.0  0.0  94996  3908 ?        S    11:58   0:00 nginx: worker process
root     44758  0.0  0.0  94996  3980 ?        S    11:58   0:00 nginx: worker process
root     44759  0.0  0.0  94996  3980 ?        S    11:58   0:00 nginx: worker process

假设新的master进程因为某些原因hung住了没有关闭,能够向它们发送SIGTERM或者SIGKILL信号。当新的master进程退出后。老的master进程会将nginx.pid.oldbin文件重命名为nginx.pid. 


參考文献:

Nginx:http://wiki.nginx.org/CommandLine#Upgrading_To_a_New_Binary_On_The_Fly

陶辉。深入理解Nginx模块开发与架构解析



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