Heim >Backend-Entwicklung >Python-Tutorial >Ausführliche Erklärung, wie mit Python automatisch eine Docker-Nginx-Reverse-Proxy-Konfiguration generiert wird
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: utf8import osimport jsonimport reimport subprocessdef 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 retdef 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 class="brush:php;toolbar:false">" + hosts + "")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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