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使用python自动生成docker nginx反向代理配置【zoues.com】
一月 3, 2017|DockerPaaS

使用python自动生成docker nginx反向代理配置【zoues.com】

使用python自动生成docker nginx反向代理配置【zoues.com】

由于在测试环境上用docker部署了多个应用,而且他们的端口有的相同,有的又不相同,数量也比较多,在使用jenkins发版本的时候,不好配置,于是想要写一个脚本,能在docker 容器创建、停止的时候,自动生成nginx反向代理,然后reload nginx

我的原则是尽量简单,轻量,内存占用少

目标很明确,只要能监听到docker的容器启动/停止事件,即可

网上查了一下可以用docker events来监听docker事件,试了一下,发现基本可以满足,于是用python写了一段程序,用来监听docker事件

python

#!/usr/bin/python # coding: utf8 import os import json import re import subprocess   def override(path, text):     if not os.path.exists(path) and os.path.exists(path+"_temp"):         os.rename(path+"_temp",path)     fw = open(path+"_temp", 'wb')     fw.write(text)     fw.close()     if os.path.exists(path):         os.remove(path)     os.rename(path+"_temp", path)   def read(path):     try:         fr = open(path, "rb")     except IOError:         print "The file don't exist, Please double check!"         return     lines = fr.readlines()     ret = ''     for line in lines:         ret += line     return ret   def read_jsonfile(path):     return json.loads(read(path))   def cmd(command):     return os.popen(command).read()   def get_name(container):     return cmd("docker inspect -f '{{.Name}}' " + container).replace("/", "").replace('/n', '')   def get_ip(container):     return cmd("docker inspect -f '{{.NetworkSettings.IPAddress}}' " + container).replace('/n', '')   def get_port(container):     return cmd("docker inspect -f '{{.Config.ExposedPorts}}' " + container).replace('/tcp:{}]', '').replace('map[', '').replace('/n', '')   def get_info(container):     filename = "/var/lib/docker/containers/" + container + "/config.v2.json"     config = read_jsonfile(filename)      name = config['Name'].replace("/", "")     port = config['Config']['ExposedPorts'].keys()[0].replace('/tcp', '')     ip = cmd("docker inspect -f '{{.NetworkSettings.IPAddress}}' " + name)     # ip = config['NetworkSettings']['Networks']['bridge']['IPAddress']      ret = {'name': name, 'port': port, 'ip': ip}     return ret   tpl = """     server {         listen 80;         server_name $name.test.com;         location / {         proxy_set_header X-Real-IP $remote_addr;             proxy_set_header Host $http_host;             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;             proxy_pass http://$ip:$port;         }     } """   def generate_conf():     print "generate_conf"     out = cmd("docker ps | grep -v CONTAINER | awk '{print $1}'")     containers = out.split("/n")     servers = ''     hosts = ''     for con in containers:         if con != '':             name = get_name(con)             ip = get_ip(con)             port = get_port(con)             print ip, port             if len(port) >= 2:                 servers += tpl.replace("$name", name).replace("$ip", ip).replace("$port", port)                 hosts += "11.12.13.14 " + name + ".test.com/n"     override('/usr/local/openresty/nginx/conf/vhost.conf', servers)     override('/usr/local/openresty/nginx/html/vhost.html', "<pre>" + hosts + "</pre>")   def reload_nginx():     print "reload nginx"     cmd('nginx -s reload')   def auto_reload():     generate_conf()     reload_nginx()  print " ==================== docker events ==================== "  # auto_reload()  proc = subprocess.Popen(["docker", "events"],                         # shell=True,   # windows: true, linux: false                         stdout=subprocess.PIPE)  while 1:     out = proc.stdout.readline()     event = re.sub('/(|/)', "", out).split(" ")     if out.find('container stop') != -1:         auto_reload()         print ' container stop '     elif out.find('container start') != -1:         auto_reload()         print ' start container '     if out == '':         print "out "         break

启动命令:

nohup ./docker.py > /dev/null 2>&1 &

程序会在后台运行,断开ssh也不会结束

主要就是生成一个 conf 文件,这个文件要在nginx.conf里面引入,然后每次有容器启动/停止都生成这个文件,然后重启nginx,我这了还把容器名加上一个域名,组合成了一个子域名,然后把对应的映射关系生成了一个html文件,通过浏览器可以访问这个文件,然后把对应的代码 复制到本机的 hosts 文件里面,可以实现通过域名访问应用,当然只是开发测试的时候会这么做,但是也足够了。

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