利用python自动生成docker nginx反向代理配置
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
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#!/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:
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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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