Docker container connection
In front of us to achieve access to the network through the port is operating in the docker container services. Let's connect to a docker container port
Network Port Mapping
We created a python application container.
w3big@w3big:~$ docker run -d -P training/webapp python app.py fce072cc88cee71b1cdceb57c2821d054a4a59f67da6b416fceb5593f059fc6d
In addition, we can specify the network address binding container, such as binding 127.0.0.1.
We use the -P parameter to create a container, use docker ps port 5000 is bound to see a host port 32768.
w3big@w3big:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES fce072cc88ce training/webapp "python app.py" 4 minutes ago Up 4 minutes 0.0.0.0:32768->5000/tcp grave_hopper
We can also use the -p flag to specify the container port is bound to the host port.
Is the difference between the two ways:
- -P: Is mapped to the inside of the container port random high port on the host.
- -p: inside the container port is bound to the specified host port.
w3big@w3big:~$ docker run -d -p 5000:5000 training/webapp python app.py 33e4523d30aaf0258915c368e66e03b49535de0ef20317d3f639d40222ba6bc0
w3big@w3big:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 33e4523d30aa training/webapp "python app.py" About a minute ago Up About a minute 0.0.0.0:5000->5000/tcp berserk_bartik fce072cc88ce training/webapp "python app.py" 8 minutes ago Up 8 minutes 0.0.0.0:32768->5000/tcp grave_hopper
In addition, we can specify the network address binding container, such as binding 127.0.0.1.
w3big@w3big:~$ docker run -d -p 127.0.0.1:5001:5002 training/webapp python app.py 95c6ceef88ca3e71eaf303c2833fd6701d8d1b2572b5613b5a932dfdfe8a857c w3big@w3big:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 95c6ceef88ca training/webapp "python app.py" 6 seconds ago Up 6 seconds 5000/tcp, 127.0.0.1:5001->5002/tcp adoring_stonebraker 33e4523d30aa training/webapp "python app.py" 3 minutes ago Up 3 minutes 0.0.0.0:5000->5000/tcp berserk_bartik fce072cc88ce training/webapp "python app.py" 10 minutes ago Up 10 minutes 0.0.0.0:32768->5000/tcp grave_hopper
So that we can access the container through the access port 127.0.0.1:5001 5002.
The above example, the default is to bind tcp port, if you want to bind UPD ports, a port in the back plus / udp.
w3big@w3big:~$ docker run -d -p 127.0.0.1:5000:5000/udp training/webapp python app.py 6779686f06f6204579c1d655dd8b2b31e8e809b245a97b2d3a8e35abe9dcd22a w3big@w3big:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 6779686f06f6 training/webapp "python app.py" 4 seconds ago Up 2 seconds 5000/tcp, 127.0.0.1:5000->5000/udp drunk_visvesvaraya 95c6ceef88ca training/webapp "python app.py" 2 minutes ago Up 2 minutes 5000/tcp, 127.0.0.1:5001->5002/tcp adoring_stonebraker 33e4523d30aa training/webapp "python app.py" 5 minutes ago Up 5 minutes 0.0.0.0:5000->5000/tcp berserk_bartik fce072cc88ce training/webapp "python app.py" 12 minutes ago Up 12 minutes 0.0.0.0:32768->5000/tcp grave_hopper
docker port command allows us to quickly and easily view the port binding information.
w3big@w3big:~$ docker port adoring_stonebraker 5002 127.0.0.1:5001
Docker container connection
Port mapping is not the only way to connect to another docker container.
docker has a connection system allows multiple containers together, sharing the connection information.
docker connection will create a parent-child relationship, the parent container in which you can see the information of the sub container.
Naming container
When we create a container of time, docker it will automatically be named. In addition, we can also use the --name to identify the naming container, for example:
w3big@w3big:~$ docker run -d -P --name w3big training/webapp python app.py 43780a6eabaaf14e590b6e849235c75f3012995403f97749775e38436db9a441
We can view the name of the container using a docker ps command.
w3big@w3big:~$ docker ps -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 43780a6eabaa training/webapp "python app.py" 3 minutes ago Up 3 minutes 0.0.0.0:32769->5000/tcp w3big