我们这里玩儿nginx,全都会在nginx里去写lua脚本,因为我们需要自定义一些特殊的业务逻辑
比如说,流量分发,自己用lua去写分发的逻辑,在分发层nginx里去写的
再比如说,要用lua去写多级缓存架构存取的控制逻辑,在应用层nginx里去写的
后面还要做热点数据的自动降级机制,也是用lua脚本去写降级机制的,在分发层nginx里去写的
因为我们要用nginx+lua去开发,所以会选择用最流行的开源方案,就是用OpenResty
nginx+lua打包在一起,而且提供了包括redis客户端,mysql客户端,http客户端在内的大量的组件
我们这一讲是去部署应用层nginx,会采用OpenResty的方式去部署nginx,而且会带着大家写一个nginx+lua开发的一个hello world
1、部署第一个nginx,作为应用层nginx(192.168.31.187那个机器上)
(1)部署openresty
mkdir -p /usr/servers
cd /usr/servers/
yum install -y readline-devel pcre-devel openssl-devel gcc
wget http://openresty.org/download/ngx_openresty-1.7.7.2.tar.gz
tar -xzvf ngx_openresty-1.7.7.2.tar.gz
cd /usr/servers/ngx_openresty-1.7.7.2/
cd /usr/servers/ngx_openresty-1.7.7.2/bundle/LuaJIT-2.1-20150120/
make clean && make && make install
ln -sf luajit-2.1.0-alpha /usr/local/bin/luajit
cd /usr/servers/ngx_openresty-1.7.7.2/bundle
wget https://github.com/FRiCKLE/ngx_cache_purge/archive/2.3.tar.gz
tar -xvf 2.3.tar.gz
cd /usr/servers/ngx_openresty-1.7.7.2/bundle
wget https://github.com/yaoweibin/nginx_upstream_check_module/archive/v0.3.0.tar.gz
tar -xvf v0.3.0.tar.gz
cd /usr/servers/ngx_openresty-1.7.7.2
./configure --prefix=/usr/servers --with-http_realip_module --with-pcre --with-luajit --add-module=./bundle/ngx_cache_purge-2.3/ --add-module=./bundle/nginx_upstream_check_module-0.3.0/ -j2
make && make install
cd /usr/servers/
ll
/usr/servers/luajit
/usr/servers/lualib
/usr/servers/nginx
/usr/servers/nginx/sbin/nginx -V
启动nginx: /usr/servers/nginx/sbin/nginx
(2)nginx+lua开发的hello world
vi /usr/servers/nginx/conf/nginx.conf
在http部分添加:
lua_package_path "/usr/servers/lualib/?.lua;;";
lua_package_cpath "/usr/servers/lualib/?.so;;";
/usr/servers/nginx/conf下,创建一个lua.conf
server {
listen 80;
server_name _;
location /lua {
default_type 'text/html';
content_by_lua 'ngx.say("hello world")';
}
}
在nginx.conf的http部分添加:
include lua.conf;
验证配置是否正确:
/usr/servers/nginx/sbin/nginx -t
重新nginx加载配置
/usr/servers/nginx/sbin/nginx -s reload
访问http: http://192.168.31.187/lua
vi /usr/servers/nginx/conf/lua/test.lua
ngx.say("hello world");
修改lua.conf
location /lua {
default_type 'text/html';
content_by_lua_file conf/lua/test.lua;
}
查看异常日志
tail -f /usr/servers/nginx/logs/error.log
(3)工程化的nginx+lua项目结构
项目工程结构
hello
hello.conf
lua
hello.lua
lualib
*.lua
*.so
放在/usr/hello目录下
/usr/servers/nginx/conf/nginx.conf
worker_processes 2;
error_log logs/error.log;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type text/html;
lua_package_path "/usr/hello/lualib/?.lua;;";
lua_package_cpath "/usr/hello/lualib/?.so;;";
include /usr/hello/hello.conf;
}
/usr/hello/hello.conf
server {
listen 80;
server_name _;
location /lua {
default_type 'text/html';
lua_code_cache off;
content_by_lua_file /usr/hello/lua/hello.lua;
}
}
2、如法炮制,在另外一个机器上,也用OpenResty部署一个nginx