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This article introduces the knowledge of "how to install Docker in Centos7". 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!

1 、 Centos 7 install docker-ce

Install the specified version of Docker-CE:

# Step 1: find the version of Docker-CE:

# yum list docker-ce.x86_64-- showduplicates | sort-r

* updates: mirrors.aliyun.com

Loading mirror speeds from cached hostfile

Loaded plugins: fastestmirror

Installed Packages

* extras: mirrors.aliyun.com

* epel: mirrors.ustc.edu.cn

Docker-ce.x86_64 3Rank 18.09.0-3.el7 docker-ce-stable

Docker-ce.x86_64 3rig 18.09.0-3.el7 @ docker-ce-stable

Docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable

Docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable

Docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable

Docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable

Docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable

* base: mirrors.cqu.edu.cn

Available Packages

# Step2: install the specified version of Docker-CE

# sudo yum-y install docker-ce- [VERSION]

Install the latest version of Docker-CE:

# step 1: install some necessary system tools

Yum install-y yum-utils device-mapper-persistent-data lvm2-y

# Step 2: add software source information

Yum-config-manager-- add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# Step 3: update and install Docker-CE

Yum makecache fast

Yum-y install docker-ce

# Step 4: enable Docker service

Systemctl start docker.service

Step 5: view the Docker installation version

Docker-version

Docker version 18.09.0, build 4d60db4

2. Docker installation directory structure

3. Start and stop mirroring

3.1. Launch the container

Custom image name: easy to distinguish

-d running in the background

Specify the name of the host boot

[root@centos7 ~] # docker run-itd-h hostname image

For example:

[root@centos7 ~] # docker run-itd docker.io/ubuntu / bin/bash

Root@82f8b90c9eba:/#

3.2. stop / exit, docker exit the container, and close the container

Exit

Docker exits the container without closing the container:

Ctrl+p ctrl+q / / here are two steps

Ctrl+p+q

Docker maps the local port to the running container

[root@centos7] # docker run-itd-p 0.0.0.0 name apache docker.io/ubuntu 80-- name apache docker.io/ubuntu / bin/bash

4. Docker common commands and explanations are as follows

Docker search nginx / / search Mirror Library

Docker pull nginx / / Select the appropriate image and pull the image

Docker images nginx / / find the image whose REPOSITORY is nginx in the local image list

Docker images httpd / / find the image whose REPOSITORY is apache in the local image list

Docker info / / View docker information

Docker version / / View docker version

Docker pull image name / / download (pull) image

Docker push image name / / upload image

Docker load-I image name. Tar / / Import image

Docker images / / View the list of all installed images

Docker attach image name / image ID / / enter the image

Docker exec image name / image ID ls / home / / execute the shell command into the container

For example: a.txt b.txt is the two text files I started to create.

[root@centos7 ~] # docker exec elegant_bhaskara ls / home

A.txt

B.txt

[root@centos7 ~] # docker stop image name / image ID / / stop mirroring

[root@centos7 ~] # docker tag original image name new image name / / generate a new images

For example: docker tag docker.io/ubuntu ubuntu:laste

[root@centos7 ~] # docker run-it test:ubuntu / bin/bash

[root@centos7 ~] # docker commit hopeful_carson (NAMES) ubuntu (REPOSITORY): self (tag) / / submit the image to generate a new image, and the configuration in the image is retained to facilitate the management of multiple versions

[root@centos7 ~] # docker run-itd-- name test01_self ubuntu:self starts a new image with the submitted image

0f280fd95659c81fcff4069bb53ff53b07d06b28de05111dd5a9177e16865f22

[root@centos7 ~] # docker exec test01_self ls / home

5. Submit the running container as an image (so that various operations in the container will not be lost)

[root@centos7 ~] # docker commit clever_haibt clever_haibt_new

# clever_haibt (running container name) clever_haibt_new (generated image name)

6. Run the image and add the port

[root@centos7] # docker run-d-it-p 80:80 clever_haibt_new:latest / bin/bash

# small p is a custom port latest is an image label (it is best to write it professionally)

Give an example of apache:httpd:latest

# docker run-d-it-p 80:80 httpd:latest

Test: http://ip

7. List the running images

[root@centos7 ~] # docker ps / / View the status of running containers

View the space occupied by images, containers, and data volumes

[root@centos7 ~] # docker system df

8. Docker itself provides two ways to terminate the operation of the container. Check the help.

[root@centos7] # docker stop-- help

For example: docker stop NAMES

Docker kill-help

9. Solve the problem that the public network is inaccessible after the docker port is mapped to the host in linux?

Solution:

[root@centos7 ~] # vim / etc/sysctl.conf

Or

[root@centos7 ~] # vim / usr/lib/sysctl.d/00-system.conf

Add the following code:

Net.ipv4.ip_forward=1

Restart the network service

# systemctl restart network

Check to see if the modification is successful

# sysctl net.ipv4.ip_forward

If returned as "net.ipv4.ip_forward = 1"

It means it's a success.

10. Delete the image

Stop mirroring first-- then perform delete operation

[root@centos7 ~] # docker rm image name / container ID

[root@centos7 ~] # docker rm-f Image name / Container ID / / Force deletion of Image

11. Export the image and generate the tar package. Export exports the file system of the read-write layer.

[root@centos7 ~] # docker export image name / image ID > XXXX.tar

For example:

[root@centos7 ~] # docker export test01_self > test01.tar

Export full image: save: export all files and history of the image

[root@centos7 ~] # docker save docker.io/imagine10255/centos6-lnmp-php56 > lnmp.tar

12. Import the image

[root@centos7 ~] # docker import test01.tar (mirror package) ubuntu:self_new (new image name)

13. Start the imported image

[root@centos7] # docker run-itd-- name ubuntu_self_new ubuntu:self_new / bin/bash

The file created before packaging exists

Import full image: load

[root@centos7 ~] # docker rmi docker.io/imagine10255/centos6-lnmp-php56 / / Delete

[root@centos7 ~] # docker load-I lnmp.tar / / re-import

This is the end of the content of "how to install Docker in Centos7". Thank you for 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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