This is the 14th day of my participation in the August More Text Challenge. For details, see:August is more challenging
This article first switches to the root user based on CentOS7
.
.Install docker-ce(CommunityEdition).
Find through yum
The default is to find a version older than 1.13.1
yum list docker**
yum list docker-ce
There is no docker-CE package, because the default source of CentOS7 does not hold the docker-CE package
Docker yum repo has not been added yet
Add docker repo as user root
yum-config-manager —add-repo Download.docker.com/linux/cento…
Ok, try to find the Docker community version, the current stability to the community version 20.10.2
Add -y to yum to confirm the installation of other dependency packages.
yum install -y docker-ce
To view the Docker version, execute
docker -v
Try to find an image or look at the running container and find “Cannot connect to Docker daemon at docker.sock”
Start dockerd (docker daemon) and add boot.
systemctl start docker
Systemctl enable docker # Start dockerd
Systemctl status docker # check dockerd or: ps – ef | grep docker
The installation ends here.
Try the docker command
No docker Container processes are currently running.
Find the official Hello-World image and run it.
Docker search the hello world – | head – 5 # 5 lines, first four hello – world mirror
Here are the results:
Docker pull hello-world # pull the first official image
Docker Images # View local cache into images
Run the first Docker image: Hello-world, and see the container already running
docker run hello-world
docker ps
Because the image is just to show the output “Hello from Docker” and the help information related to getting started with Docker, as shown above.
Use a container to run ubuntu in the background
Docker run -it Ubuntu bash
This command starts Ubuntu within a container process and goes directly to the bash console.
Use the background boot mode (-d) to run an Ubuntu system inside the container.
docker run -it -d ubuntu
You can forward commands from a container to a specific container, such as to view system information:
docker exec 735abdacd166 uname -a
I’ll leave you there, take a break, and continue studying later.
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Refer to the link
Systemctl using: www.cnblogs.com/dyh004/p/66…
Docker related: docs.docker.com/get-started… & https://hub.docker.com