Operation tutorial for smooth upgrade of nginx

Smooth upgrade overview
Nginx conveniently helps us achieve smooth upgrades. The principle is simply summarized as follows:
(1) Start a new process without stopping the old process.
(2) The old process is responsible for processing requests that have not yet been processed, but will no longer accept processing requests.
(3) The new process accepts new requests.
(4) The old process stops after processing all requests and closing all connections.
This makes it easy to achieve smooth upgrades. Generally, there are two situations when you need to upgrade Nginx. One is to really upgrade the version of Nginx, and the other is to add a new module to Nginx.

Upgrade process
The specific operation is also very simple, as follows:

(0) View the current version
Enter in the directory where the Nginx executable file is stored:

Copy the code as follows:

./nginx -V

(1) Download the new Nginx version and compile it .

Copy the code code as follows:

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

##Be careful not to make install

Download:

[root@liuawblizfpws~]#wget *.*.tar.gz (version number has been modified)

Unzip:

[root@liuawblizfpws ~]#tar zxvf nginx-0.*.*.tar.gz (version number has been modified)

By the way, the version number of nginx is modified here, which plays a certain security role.

Modify the source code file:

[root@liuawblizfpws ~]#vim nginx-0.*.*/src/core/nginx.h

#define NGINX_VERSION "*.$.&" (version number)

#define NGINX_VER "net/" NGINX_VERSION (server name)

You need to check the previous nginx installation information before recompiling ：[root@liuawblizfpws ~]#/usr/local/nginx/sbin/nginx -V

Get information (the path varies from person to person):nginx: configure arguments: --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module

Compile, but not install; in the compilation directory The nginx file in the objs directory is the new executable file:

[root@liuawblizfpws nginx-0.*.*]#./configure --user=www --group=www -- prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module

[root@liuawblizfpws nginx-0.*.*]#make

Back up the original nginx file: [root@liuawblizfpws ~]#mv /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.old

will have been compiled Copy the nginx file to the corresponding execution path: cp ~/nginx-0.*.*/objs/nginx /usr/local/nginx/sbin/nginx

Test to avoid failure Smooth upgrade:

[root@liuawblizfpws ~]#/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

If the test passes, modify nginx.pid to your nginx.pid.oldbin, while starting the new nginx: [root@liuawblizfpws ~]#kill -USR2 `cat /usr/local/nginx/logs/nginx.pid`

Exit original nginx: [root@liuawblizfpws ~]#kill -QUIT `cat /usr/loca/nginx/logs/nginx.pid.oldbin`

Check:

[root@liuawblizfpws ~]#curl -I netonline.me

HTTP/1.1 200 OK

Server: net/*.$.&

Date: Thu, 09 Dec 2010 05:13:36 GMT

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