Docker Hello World
Docker allows you to run applications in the container, using the docker run command to run an application in the container.
Hello world output
w3big@w3big:~$ docker run ubuntu:15.10 /bin/echo "Hello world" Hello world
Analytical parameters:
docker: Docker binary executable file.
run: previous docker combination to run a container.
ubuntu: 15.10 designated to run the mirror, Docker first from the local host mirror exists, if does not exist, Docker will be downloaded from a mirror image of public warehouse Docker Hub.
/ bin / echo "Hello world" : in order to start the implementation of the container
The above command complete meaning can be interpreted as: Docker to create a new image ubuntu15.10 container, and then execute bin / echo "Hello world" in the container, and then outputs the result.
Running an interactive container
We docker two parameters -i -t, let container docker run to achieve "dialogue" capability
w3big@w3big:~$ docker run -i -t ubuntu:15.10 /bin/bash root@dc0050c79503:/#
Analytical parameters:
-t: Specifies a pseudo-terminal or in the new container terminal.
-i: allows you to enter a standard container (STDIN) to interact.
At this point we have entered a ubuntu15.10 container system
We try to run in a container command cat / proc / version and ls respectively view the list of file version information systems and the current in the current directory
We can run the exit command or use CTRL + D to exit the container.
Starting container (background mode)
Create a process container run using the following command
w3big@w3big:~$ docker run -d ubuntu:15.10 /bin/sh -c "while true; do echo hello world; sleep 1; done" 2b1b7a428627c51ab8810d541d759f072b4fc75487eed05812646b8534a2fe63
In the output, we do not expect to see the "hello world", but a string of characters long
2b1b7a428627c51ab8810d541d759f072b4fc75487eed05812646b8534a2fe63
This is called the long string container ID, for each container, is unique, we can through the container ID to view the corresponding container what happened.
First, we need to make sure the container has run, you can view the docker ps
w3big@w3big:~$ docker ps
CONTAINER ID: Container ID
NAMES: container name automatically assigned
Use docker logs command in the container, the container to view the standard output
w3big@w3big:~$ docker logs 2b1b7a428627
w3big@w3big:~$ docker logs amazing_cori
Stop the container
We use docker stop command to stop the container:
By docker ps view, the container has stopped working:
w3big@w3big:~$ docker ps
You can also use the following command to stop:
w3big@w3big:~$ docker stop amazing_cori