zookeeper 动态管理nginx配置

假设我们有一个场景，所有服务器共享同一份配置文件，我们肯定不可能单独手动维护每台服务器，这时可以利用zookeeper的配置管理功能。

环境：python + nginx + zookeeper

目的：当zookeeper中的配置文件发生变化时nginx自动拉取最新配置文件并应用到本地，最终重启服务器：

一。搭建zookeeper集群：

步骤略，请参考：http://zookeeper.apache.org/doc/r3.4.13/zookeeperStarted.html

请确保zookeeper集群为健康状态：

二。安装nginx

yum install nginx -y

启动nginx：  systemctl start nginx

三。编写python zookeeper 客户端：

目的：定期连接zookeeper集群，检测配置文件发生变化：

from kazoo.client import KazooClient
import time
zk=KazooClient(hosts='192.168.85.137:2181')
zk.start()

Version=None
while True:
    @zk.DataWatch("/nginx")
    def watch_node(data, stat):
        global Version
        if Version == None:
            Version=stat
        if Version != stat:
           Version = stat
           nginx_file=str(data,encoding='utf-8')
           print("配置已改变！！！！！")
           f=open('nginx.conf','w',encoding='utf-8')
           f.write(nginx_file)
           f.flush()
           f.close()
           import os
           Path=os.path.dirname(os.path.abspath(__file__))
           os.system('cp -f %s/nginx.conf /etc/nginx/nginx.conf && systemctl restart nginx.service'%Path)   #替换nginx配置文件，然后重启服务，注意，这这里只是写了一个大体框架，生产环境一定不要直接重启，可以写一些判断，至少应该先确保配置文件没有错误再重启nginx
        time.sleep(3)

测试：修改zookeeper中的nginx配置，看客户端是否能拉去配置文件：

from kazoo.client import KazooClient
import time
zk=KazooClient(hosts='192.168.85.137:2181')
zk.start()

nginx_config="""
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
    worker_connections 1024;
}
http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       5555 default_server;
        index index.php index.html;
        server_name  _;
        root         /usr/share/nginx/html;
        include /etc/nginx/default.d/*.conf;

location ~ .php$ {
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            #fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            fastcgi_split_path_info ^(.+.php)(/.+)$;
            fastcgi_param PATH_INFO $fastcgi_path_info;
            include        fastcgi_params;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}

"""
zk.set('/nginx',bytes(nginx_config,encoding='utf-8'))

成功！！！