容器基础(七): 使用docker compose部署程序

配置

在上一节的基础上,  增加如下的docker-compose.yml文件, 然后用docker-compose up命令启动容器进行部署:

 version: ""
 services:
   server:
     image: update/server:v0.
     labels:
       description: "tcp server test script"
     restart: always
     command: -p 

   worker:
     image: update/worker:v0.
     labels:
       description: "tcp client test script"
     restart: always
     links:
       - server:server
     command: -d server -p 

启动信息:

 linux:/app # docker-compose  up
 Creating network "app_default" with the default driver
 Creating app_server_1_17e8cbeb1e01 ... done
 Creating app_worker_1_bd97b9199c60 ... done
 Attaching to app_server_1_74e7ece79785, app_worker_1_bb9dcc04daf9

 linux:/app/original/server # docker ps
 CONTAINER ID        IMAGE                COMMAND                  CREATED              STATUS              PORTS               NAMES
 81211aa6383c        update/worker:v0.   "python worker.py ..."   About a minute ago   Up About a minute                       app_worker_1_bb9dcc04daf9
 76c322567db7        update/server:v0.   "python server.py ..."   About a minute ago   Up About a minute                       app_server_1_74e7ece79785
 linux:/app/original/server # docker exec ^C
 linux:/app/original/server # docker exec 81211aa6383c ss -a | grep
 tcp    ESTAB                       172.18.0.3:        172.18.0.2:
 linux:/app/original/server # docker exec 76c322567db7 ss -a | grep
 tcp    LISTEN                               *:                  *:*
 tcp    ESTAB                       172.18.0.2:         172.18.0.3:
 linux:/app/original/server # docker exec 76c322567db7 tail -f /update/server/log/server.log
 -- :: [INFO]  Waiting for connection...
 -- :: [INFO]  ('172.18.0.3', ) connected
 tail: unrecognized file system type 0x794c7630 for '/update/server/log/server.log'. please report this to bug-coreutils@gnu.org. reverting to polling
 ^C
 linux:/app/original/server # docker exec 81211aa6383c tail -f /update/worker/log/worker.log
 tail: unrecognized file system type 0x794c7630 for '/update/worker/log/worker.log'. please report this to bug-coreutils@gnu.org. reverting to polling
 -- :: [INFO]  [recv] hello, docker!
 -- :: [INFO]  [recv] hello, docker!
 -- :: [INFO]  [recv] hello, docker!
 ^C
 linux:/app/original/server #
 linux:/app #  docker-compose -f docker-compose.yml down
 Stopping app_worker_1_bd97b9199c60 ... done
 Stopping app_server_1_17e8cbeb1e01 ... done
 Removing app_worker_1_bd97b9199c60 ... done
 Removing app_server_1_17e8cbeb1e01 ... done
 Removing network app_default
 linux:/app #

支持环境变量传参

在上面的基础上，把命令行传参的方式改为通过环境变量传参:

 FROM jason/debian-python27:v1.

 MAINTAINER jason<djsxut@.com>

 RUN mkdir -p /env/server

 COPY . /env/server

 WORKDIR /env/server

 ENV PATH $PATH:/env/server

 ENTRYPOINT ["python", "server.py"]

/app/env/server/Dockerfile

 #!/usr/bin/python
 # -*- coding: utf- -*-

 import os
 import sys
 import time
 import socket
 import select
 import signal
 import threading

 log_file = "log/server.log"

 def log(msg):
   if not os.path.exists("log"):
     os.mkdir("log")
   with open(log_file, "a") as wf:
     wf.writelines(
         time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time())) +
         " [INFO]  " + msg + "\n")

 def do_listen(port):
   server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   server_socket.bind(('', port))
   server_socket.listen()
   print 'Waiting for connection...'
   log('Waiting for connection...')
   server_socket.setblocking()

   rfd = [server_socket, ]

   while True:
     rlist, wlist, xlist = select.select(rfd, [], [])
     for sock in rlist:
       if sock == server_socket:
         newsock, addr = server_socket.accept()
         print '[+] %s connected' % str(addr)
         log('%s connected' % str(addr))
         rfd.append(newsock)
       else:
         data = sock.recv()
         if data:
           sock.send(data)
         else:
           print '[-] %s closed' % str(sock.getpeername())
           log('%s closed' % str(sock.getpeername()))
           rfd.remove(sock)
           sock.close()

 def signal_handler(signum, frame):
   print '\n[-] signal(%d) received, exit!' % signum
   log('signal(%d) received, exit!' % signum)
   sys.exit(-)

 if __name__ == '__main__':
   try:
     port = int(os.environ['APP_PORT'])
   except:
     print '[-] environment APP_PORT should be set'
     log('environment APP_PORT should be set')
     sys.exit(-)

   signal.signal(signal.SIGINT, signal_handler)  

   try:
     do_listen(port)
   except Exception, e:
     print e
     print '\nExit'

/app/env/server/server.py

 FROM jason/debian-python27:v1.

 MAINTAINER jason<djsxut@.com>

 RUN mkdir -p /env/worker

 COPY . /env/worker

 WORKDIR /env/worker

 ENV PATH $PATH:/env/worker

 ENTRYPOINT ["python", "worker.py"]

/app/env/worker/Dockerfile

 #!/usr/bin/python
 # -*- coding: utf- -*-

 import os
 import sys
 import time
 import socket
 import signal
 import getopt
 import threading

 log_file = "log/worker.log"

 def log(msg):
   if not os.path.exists("log"):
     os.mkdir("log")
   with open(log_file, "a") as wf:
     wf.writelines(
         time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time())) +
         " [INFO]  " + msg + "\n")

 class Handler:
   def __init__(self, domain, port):
     self.domain = domain
     self.port   = port
     self.sock   = None

   def get_socket(self):
     for res in socket.getaddrinfo(self.domain, self.port,
                                   socket.AF_INET, socket.SOCK_STREAM):
       family, socktype, proto, canonname, sa = res
       try:
         self.sock = socket.socket(family, socktype, proto)
         #self.sock.setblocking()
         #sock.settimeout(0.5)
         self.sock.connect(sa)
       except socket.error, msg:
         if self.sock != None:
           self.sock.close()
         self.sock = None
       else:
         return True

     return False

   def do_handler(self):
     while self.sock == None and self.get_socket() == False:
       print '[-] connect failed...'
       log('connect failed...')
       time.sleep()

     print '[+] %s connected' % str(self.sock.getpeername())
     log('[+] %s connected' % str(self.sock.getpeername()))
     while True:
       # do something
       self.sock.send('hello, docker!')
       data = self.sock.recv()
       if data:
         print '[+][recv] %s' % data
         log('[recv] %s' % data)
         time.sleep()
       else:
         print '[-] server closed, exit'
         log('server closed, exit')
         self.sock.close()
         self.sock = None
         break

 def signal_handler(signum, frame):
   print '\n[-] signal(%d) received, exit!' % signum
   log('signal(%d) received, exit!' % signum)
   sys.exit(-)

 if __name__ == '__main__':
   signal.signal(signal.SIGINT, signal_handler)  

   try:
     domain = os.environ['APP_DOMAIN']
     port = int(os.environ['APP_PORT'])
   except:
     print '[-] environment APP_PORT/APP_DOMAIN should be set'
     log('environment APP_PORT/APP_DOMAIN should be set')
     sys.exit(-)

   try:
     handler = Handler(domain, port)
     handler.do_handler()
   except Exception, e:
     print e
     print '\nExit'

/app/env/worker/worker.py

简单修改下docker-compose.yml文件：

 version: ""
 services:
   server:
     image: env/server:v0.
     build:
       context: /app/env/server
       dockerfile: Dockerfile
     labels:
       description: "tcp server test script"
     restart: always
     environment:
       - APP_PORT=${APP_PORT-}
     volumes:
       - /app/env/server/log:/env/server/log

   worker:
     image: env/worker:v0.
     build: /app/env/worker
     labels:
       description: "tcp client test script"
     restart: always
     links:
       - server
     environment:
       - APP_PORT=${APP_PORT-}
       - APP_DOMAIN=server
     volumes:
       - /app/env/worker/log:/env/worker/log
     deploy:
       replicas: 

执行结果如下所示：

 linux:/app/env/server # APP_PORT= docker-compose up -d
 WARNING: Some services (worker) use the 'deploy' key, which will be ignored. Compose does not support 'deploy' configuration - use `docker stack deploy` to deploy to a swarm.
 Creating network "env_default" with the default driver
 Building server
 Step / : FROM jason/debian-python27:v1.
  ---> cd0b2f7d8d04
 Step / : MAINTAINER jason<djsxut@.com>
  ---> Using cache
  ---> d239a9d50575
 Step / : RUN mkdir -p /env/server
  ---> Running in f1802bbbf5f8
  ---> b196dec5ece6
 Removing intermediate container f1802bbbf5f8
 Step / : COPY . /env/server
  ---> 789a69dde7bc
 Removing intermediate container 53d720f6e28d
 Step / : WORKDIR /env/server
  ---> 8bc3b957a769
 Removing intermediate container dfd8c4cecd45
 Step / : ENV PATH $PATH:/env/server
  ---> Running in 0935ca701a19
  ---> d6fdd5814444
 Removing intermediate container 0935ca701a19
 Step / : ENTRYPOINT python server.py
  ---> Running in 9209e05da1a9
  ---> c34b7a72cb0b
 Removing intermediate container 9209e05da1a9
 Successfully built c34b7a72cb0b
 WARNING: Image for service server was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
 Building worker
 Step / : FROM jason/debian-python27:v1.
  ---> cd0b2f7d8d04
 Step / : MAINTAINER jason<djsxut@.com>
  ---> Using cache
  ---> d239a9d50575
 Step / : RUN mkdir -p /env/worker
  ---> Running in de82f380b738
  ---> 480f67b5dc6a
 Removing intermediate container de82f380b738
 Step / : COPY . /env/worker
  ---> c7b98717c8c8
 Removing intermediate container 1d0857c192e6
 Step / : WORKDIR /env/worker
  ---> a6cedc9734a0
 Removing intermediate container cd648d954ada
 Step / : ENV PATH $PATH:/env/worker
  ---> Running in 977e0045899e
  ---> 5d20c078708d
 Removing intermediate container 977e0045899e
 Step / : ENTRYPOINT python worker.py
  ---> Running in 3f92d15c16f0
  ---> bd3579c73bd3
 Removing intermediate container 3f92d15c16f0
 Successfully built bd3579c73bd3
 WARNING: Image for service worker was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
 Creating env_server_1_be9373e6fe83 ... done
 Creating env_worker_1_e4e9c2ece128 ... done
 linux:/app/env/server #
 linux:/app/env/server #
 linux:/app/env/server # docker images | grep env
 env/worker              v0.                bd3579c73bd3         seconds ago      207MB
 env/server              v0.                c34b7a72cb0b         seconds ago      207MB
 linux:/app/env/server # docker ps
 CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS               NAMES
 93c7d5f760e8        env/worker:v0.     "python worker.py"    seconds ago      Up  seconds                           env_worker_1_57f3186eefba
 0712a2615e12        env/server:v0.     "python server.py"    seconds ago      Up  seconds                           env_server_1_1615d4c9ff54
 linux:/app/env/server # cat log/server.log
 -- :: [INFO]  Waiting for connection...
 -- :: [INFO]  ('172.18.0.3', ) connected
 linux:/app/env/server # cat ../worker/log/worker.log
 -- :: [INFO]  [+] ('172.18.0.2', ) connected
 -- :: [INFO]  [recv] hello, docker!
 linux:/app/env/server # docker-compose down
 WARNING: Some services (worker) use the 'deploy' key, which will be ignored. Compose does not support 'deploy' configuration - use `docker stack deploy` to deploy to a swarm.
 Stopping env_worker_1_57f3186eefba ... done
 Stopping env_server_1_1615d4c9ff54 ... done
 Removing env_worker_1_57f3186eefba ... done
 Removing env_server_1_1615d4c9ff54 ... done
 Removing network env_default
 linux:/app/env/server #

result