下载安装nginx所用的依赖
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yum -y install gcc zlib zlib-devel pcre-devel openssl openssl-devel下载nginx
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wget http://nginx.org/download/nginx-1.12.2.tar.gz
tar -xvf nginx-1.12.2.tar.gz稍后安装nginx
安装lua语言
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yum install readline-devel
curl -R -O http://www.lua.org/ftp/lua-5.3.0.tar.gz
tar zxf lua-5.3.0.tar.gz
cd lua-5.3.0
make linux test
make install安装LuaJIT，安装路径/opt/luaJIT-2.1.0自行设置
sh
wget http://luajit.org/download/LuaJIT-2.1.0-beta2.tar.gz
tar zxf LuaJIT-2.1.0-beta2.tar.gz
cd LuaJIT-2.1.0-beta2
make PREFIX=/opt/luaJIT-2.1.0
make install PREFIX=/opt/luaJIT-2.1.0设置环境变量
打开：vi /etc/profile
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export LUAJIT_LIB=/opt/luaJIT-2.1.0/lib
export LUAJIT_INC=/opt/luaJIT-2.1.0/include/luajit-2.1保存：. /etc/profile
下载ngx_devel_kit（NDK）模块 ：https://github.com/simpl/ngx_devel_kit/tags，不需要安装，记住存放位置/opt/luaJIT-2.0.5/package/ngx_devel_kit-0.2.19路径
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wget https://github.com/simpl/ngx_devel_kit/archive/v0.2.19.tar.gz
tar -xzvf v0.2.19.tar.gz
cd /opt/luaJIT-2.1.0
mkdir package
mv ngx_devel_kit-0.2.19 /opt/luaJIT-2.0.5/package/下载最新的lua-nginx-module 模块 ：https://github.com/openresty/lua-nginx-module/tags，不需要安装，记住存放位置/opt/luaJIT-2.0.5/package/lua-nginx-module-0.10.13路径
注意：一定要下载0.10.13版本，其他版本可能会报错
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wget https://github.com/openresty/lua-nginx-module/archive/v0.10.13.tar.gz
tar -xzvf v0.10.13.tar.gz
mv lua-nginx-module-0.10.13 /opt/luaJIT-2.0.5/package/
sh
# 进入安装包目录
cd
cd nginx-1.12.2在nginx中编译，/opt/nginx-1.12.2为安装路径，--add-module后面加上面下载的两个包的位置
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./configure --prefix=/opt/nginx-1.12.2 --with-http_stub_status_module --with-http_ssl_module --add-module=/opt/luaJIT-2.0.5/package/lua-nginx-module-0.10.13 --add-module=/opt/luaJIT-2.0.5/package/ngx_devel_kit-0.2.19修改Makefile文件，防治报错
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cd /opt/nginx-1.12.2找到当前目录下找到objs文件夹，并进入，打开文件Makefile,找到有一下内容的这行：
打开：vi objs/Makefile
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CFLAGS = -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Werror -g -Werror: gcc将所有的警告当成错误进行处理把这行内容中的 "-Werror"去掉
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CFLAGS = -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -g 保存：Esc，ZZ
回到上一级目录，进行安装
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cd /opt/nginx-1.12.2
make && make install要在bash中执行
echo $SHELL 需要是/bin/bash如果是其他的，执行bash，切换到bash
配置nginx的环境变量
打开：vi /etc/profile
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export NGINX_HOME=/opt/nginx-1.12.2
export PATH=$PATH:$NGINX_HOME/sbin保存：. /etc/profile
查看结果
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nginx -V
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nginx version: nginx/1.12.2
built by gcc 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)
built with OpenSSL 1.0.2k-fips 26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/opt/nginx-1.12.2 --with-http_stub_status_module --with-http_ssl_modu
le --add-module=/opt/luaJIT-2.0.5/package/lua-nginx-module-0.10.13 --add-module=/opt/luaJIT-2.0.5/package/ngx_devel_kit-0.2.19看看有没有断开的链接，如果有的话，自己连一下
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ldd $(which /opt/nginx-1.12.2/sbin/nginx)假如有 libluajit-5.1.so.2 => not found
通过观察，我们知道， libluajit-5.1.so.2 在/opt/luaJIT-2.0.5/lib/中
建立软链接
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cd /lib64
ln -s /opt/luaJIT-2.0.5/lib/libluajit-5.1.so.2 libluajit-5.1.so.2刷新lib库
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ldconfig配置服务
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cd /usr/lib/systemd/system/新建服务nginx.service
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vi /usr/lib/systemd/system/nginx.service输入以下内容，注意路径/opt/nginx-1.12.2为自己的安装nginx的路径
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[Unit]
Description=nginx - high performance web server
After=network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
PIDFile=/opt/nginx-1.12.2/logs/nginx.pid
ExecStartPre=/opt/nginx-1.12.2/sbin/nginx -t -c /opt/nginx-1.12.2/conf/nginx.conf
ExecStart=/opt/nginx-1.12.2/sbin/nginx -c /opt/nginx-1.12.2/conf/nginx.conf
ExecReload=/opt/nginx-1.12.2/sbin/nginx -s reload
ExecStop=/opt/nginx-1.12.2/sbin/nginx -s stop
ExecQuit=/opt/nginx-1.12.2/sbin/nginx -s quit
PrivateTmp=true
[Install]
WantedBy=multi-user.target在启动服务之前，需要先重载systemctl命令
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systemctl daemon-reload启动和开机自启
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#启动服务或者使用systemctl start nginx
systemctl start nginx.service
#运行以下命令设置Nginx服务开机自启动
systemctl enable nginx获取当前hadoop-ha集群的状态，例如有两台namenode，ip地址分别是192.168.206.215和192.168.206.216，那么如果192.168.206.215是active，那么下面返回active，如果是192.168.206.216是active，那么返回standby
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wget -qO- http://192.168.206.215:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus | sed 's
/,/\n/g' | grep 'State' | sed 's/"State" : "//g' | sed 's/[" ]//g'将上面代码放到一个文件中
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cd
mkdir run_shell
cd /root/run_shell
vi hadoop-status
i ...
Esc ZZ
chnod +x ./hadoop-status尝试运行确定无误
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./hadoop-status到nginx的配置文件下，进行配置
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cd /opt/nginx-1.12.2/conf/配置nginx-conf，其中/root/run_shell/hadoop-status为脚本执行的路径，/tmp/hadoop-status.tmp是随便的一个文件，避免文件名冲突，注意是>不是追加>>，access_by_lua_block是lua脚本，需要要安装上面的带有lua脚本的nginx，ngx.log(ngx.ERR, result)是日志信息，调试的时候用，可以删掉，代码可以简化，懒得弄了，user root root;是用户名和组，一定要和hadoop-status脚本权限对应，否则会没有访问执行权限，proxy_pass http://node15:50070;是重定向的hadoop-web页面，自行设置，如果报错，执行lua进入命令行，一行一行的执行，看哪里出了问题，退出lua-shell直接Ctrl+C，或者看nginx下面的logs文件中的error报错日志
vi nginx.conf
json
worker_processes 1;
user root root;
events {
worker_connections 1024;
}
http {
server {
listen 80;
server_name localhost;
location / {
access_by_lua_block {
os.execute("/bin/bash /root/run_shell/hadoop-status > /tmp/hadoop-status.tmp")
handle = io.open("/tmp/hadoop-status.tmp", "r")
result = handle:read("*a")
handle:close()
sentinel_result = result:match("active") and "active" or "standby"
ngx.log(ngx.ERR, result)
ngx.log(ngx.ERR, sentinel_result)
ngx.log(ngx.ERR, "123")
if sentinel_result == "active" then
ngx.exec("@node1")
else
ngx.exec("@node2")
end
}
}
location @node1 {
proxy_pass http://node15:50070;
}
location @node2 {
proxy_pass http://node16:50070;
}
}
}重启nginx
sh
systemctl restart nginx.service访问localhost:80即可直接跳转到active的hadoop-ha上
如果是虚拟机，则在主机上访问虚拟机的ip地址即可访问