docker run -d centos /bin/sh -c "while true;do echo is running; sleep 1;done"
# -d Run the container in the background
# /bin/sh Specifies the bash interpreter using centos
# -c Run a shell command
# "while true;do echo is running; sleep 1;done" is running in the linux background, running once per second
docker ps # check container process
docker logs -f container id/name # log information for uninterrupted print container
docker stop centos # stop container
2. Start a bash terminal and allow users to interact
docker run --name mydocker -it centos /bin/bash
# --name defines a name for the container
# -i keep the standard input of the container open
# -t Let Docker assign a pseudo terminal and bind it to the standard input of the container
# /bin/bash Specify the docker container to interact with the shell interpreter
When using docker run to create a container, the steps that Docker runs in the background are as follows:
1. Check if the specified image exists locally. If it does not exist, download it from the public repository.
2. Create and start a container with an image
3. Allocate a file system and hang on a read-write layer outside the read-only mirror layer
4. Bridge a virtual interface to the container from the bridge interface configured by the host.
5. Configure an ip address from the address pool to the container
6. Execute the user-specified application
7. The container is terminated after execution
3.Restart a stopped container
docker ps -a | grep mydocker # get ID 795190cec3a0
docker start 795
docker exec -it 795 bash
4.commit custom image
# 1.docker run -it centos
# 2.install vim
yum install -y vim
# 3.exit container
exit
# 4.show container
docker container ls -a
# 5.commit container
docker commit 795190cec3a0 evans/centos-vim
# 6.show images
docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
chaoyu/centos-vim latest fd2685ae25fe 5 minutes ago 348MB
5.External access container
docker run -d -P training/webapp python app.py
# -P The parameters will randomly map the port to the open network port of the container.
# Check the mapped port
docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cfd632821d7a training/webapp "python app.py" 21 seconds ago Up 20 seconds 0.0.0.0:32768->5000/tcp brave_fermi
#host ip:32768 Map container's 5000 port
# show logs
docker logs -f cfd # #不间断显示log
# You can also specify a mapped port with the -p parameter.
docker run -d -p 9000:5000 training/webapp python app.py
