Taking up a lot of resources

Many redundant steps

Slow startup

Docker image (Image) is a read-only template. Images can be used to create Docker containers, and one image can create many containers. Just like classes and objects in Java, classes are images and containers are objects!

Docker uses a container (Container) to run an application or a group of applications independently. Containers are running instances created from images.

It can be started, started, stopped, deleted. Each container is isolated from each other to ensure a secure platform.

A container can be thought of as a simplified version of the Linux environment (including root user permissions, process space, user space, network space, etc.) and the applications running in it.

The definition of a container is almost exactly the same as that of an image. It is also a unified perspective of a bunch of layers. The only difference is that the top layer of the container is readable and writable.

Repository is a place where image files are stored centrally.

There is a difference between a warehouse (Repository) and a warehouse registration server (Registry). There are often multiple warehouses stored on the warehouse registration server, and each warehouse contains multiple images. Each image has a different tag.

Warehouses are divided into two forms: public warehouse (Public) and private warehouse (Private).

The largest public repository is Docker Hub (https://hub.docker.com/), which stores a large number of images for users to download. Domestic public warehouses include Alibaba Cloud, NetEase Cloud, etc.

Make sure it is centos7 and above version

Check your own kernel

View version information

yum installs gcc related environment

Install yum tool package collection

Create a new container and start it

Start/stop containers

One of these two is a container that did not exist before, and the other is a container that already exists.

Show containers (running/not running)

View container logs

Exit container

Delete container

View all container IDs

Check the container’s environment variables

The command to enter the container

View container/image metadata

Copy files from container to host

Delete image

Delete all images

View image

help command

docker restart

solution

Pull image

boot image

access and install

Write dockerFile

docker build build image

docker run

docker runs a container from a base image

Execute an instruction and make changes to the container

Perform an operation similar to docker commit to submit a new image layer

Docker then runs a new container based on the image just submitted.

Execute the next instruction in the dockerfile until all instructions are executed

Divide instructions into three broad categories

DockerFile for development

Docker images become delivery standard

Docker containers involve deployment and operation and maintenance

bridge

none

host

docker version

docker info

docker --help

Mirror view

Mirror search

Image pull

Image deletion

Create a new container and start it

Enter the already started container

Exit container

List all running containers

Container deletion

docker logs -f -t --tail 200 container id

docker inspect container id