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This article introduces the relevant knowledge of "Docker installation and basic command introduction". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

# install / start Docker

# install on CentOS 7

Docker is already included in the CentOS-Extra repository by default. Install it using the following command

Sudo yum install docker

# install on CentOS 6.5

For CentOS 6.5 Docker is part of the EPEL repository, so you need to make sure that you have joined the YUM source of EPEL. On CentOS 6, the package name of Docker may conflict with the docker application on the desktop, so its package name is changed to docker-io.

Sudo yum-y remove dockersudo yum install docker-io

# start Docker

After installing Docker, you need to start the Docker daemon

Sudo service docker start

In order for docker to boot and run, you need to use chkconfig: sudo chkconfig docker on

Get the Docker image and start the Docker container

Sudo docker pull centossudo docker images centossudo docker run-I-t centos / bin/bash

# basic commands

The following command creates a simple output Hello world for the container:

$docker run ubuntu:14.04 / bin/echo 'Hello, world'Hello, world

Here the docker run command specifies that the image to be used is ubuntu:14.04, from which our container runs. When specifying an image, Docker will first look for the existence of the image on your host machine, and download it from Docker Hub if it does not exist.

Next, you specify that the command to run in the container is / bin/echo 'Hello. When the container starts, Docker creates a new ubuntu 14.04 environment and executes the command in it. When the command is executed, the lifecycle of the container created by Docker ends.

Let's create an interactive container:

$docker run-t-I ubuntu:14.04 / bin/bashroot@af8bae53bdd3:/#

Mirroring of ubuntu 14.04 is also started this time, but two additional parameters-t and-I are specified here. The parameter-t assigns a pseudo terminal (pseudo-tty) to the container you just created, and-I allows us to create an interactive connection by getting the standard input of the container.

To exit the container, type exit or ctrl+D at the terminal so that the container can be stopped

Root@2e3e7e77adbd:/# exitexit

Several commonly used docker commands:

Docker ps lists Container

Standard output of docker logs display container

Container where docker stop stops running

Docker version displays version information of the current docker client and daemon

There are many subcommands of the docker command

Attach is attached to a running container build builds an image commit from the Dockerfile current modification of the container creates a new image cp copies files / folders from the container's file system to the host path create creates a new container diff checks the container file system changes events gets real-time events from the server exec already exists Run the command export in the container to stream the contents of the container to tar archive history display mirror history images list all mirrored import create a new file system image info display system information inspect returns container low-level information kill kills a running container load loads an image login from a tar archive Register or log in to the Docker registration server logout log out of the logs retrieval container from the Docker registration server port query based on the open port from NAT to PRIVATE_PORT pause pauses all processes in the container ps lists the container pull pulls an image from the Docker registration server or the warehouse push pushes an image or warehouse to the Docker registration server restart Restart a running container rm delete one / more container rmi delete one / more images run in the new container run the command save save image to tar archive search search for an image from Docker Hub start a stopped container stop stop running container tag tag the image in the repository top Query the process running in the container unpause cancel the paused status of the container version displays the version information of Docker wait is blocked until the container stops And then print its exit code.

Use Dockerfile to build the image:

Docker build-t /.

Run the image:

Docker run-p:-d curl-I:

View the container's log (similar to the tail-f command)

Docker logs-f

# example: use an official Nginx Docker image

You need to obtain the official nginx image before using it.

Docker pull nginx

Execute the command as follows

Docker run-- name nginx_server-d-p 8080VV / Users/mylxsw/codes/php:/usr/share/nginx/html:ro nginx

The parameters provided are explained one by one below:

Name specifies that the name of the container we created is nginx_server.

-d specifies that the container runs in the background

-p specifies that port 80 of the container is mapped to port 8080 of the host

The-v parameter specifies that the local / Users/mylxsw/codes/php directory is mapped to the container's / usr/share/nginx/html directory, and the access permission is read-only

Once the container is started, it can be accessed through http://localhost:8080.

To make it more complicated, you can specify the nginx configuration file-v / some/nginx.conf:/etc/nginx/nginx.conf:ro by using the-v argument.

When specifying a new nginx configuration file, be sure to set the daemon off; configuration item for nginx. If you run in background mode, the container will not be able to track the nginx process and will end immediately after the container starts.

If it's just a test, you can use the-- rm option so that it can be deleted automatically after the container finishes running, but not with the-d option, of course.

Docker run-- rm-- name nginx_server-d-p 8080 name nginx_server 80-v / Users/mylxsw/codes/php:/usr/share/nginx/html:ro nginx "introduction to Docker installation and basic commands" ends here. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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