docker Installation and common commands

I. Overview

Docker is an application container engine open source, so developers can package their applications and dependencies into a portable container and then posted to any popular Linux machine or Windows machine, can be virtualized, the container is completely use the sandbox mechanism will not have any interface with each other.

A complete Docker has the following components:

1. DockerClient client
2. Docker Daemon Daemon
3. Docker Image Mirror
4. Docker Container vessel

 

 

 

The core technology of the container has the following core technologies:

        1.cgroups resource management (limit space)

        2.Namespace process isolation

        3.SElinux security

Here are a comparison chart docker container and traditional virtualization technology, it is clear to see why docker faster speed than traditional virtualization, because the operating system does not docker

That it can be understood as a program (not account for memory, cpu, speed) and this is the biggest difference between traditional virtualization

docker also has its own shortcomings

                             1. Isolation of the container is not strong virtualization

                             2. Shared Linux kernel, security birth defects

                             3.selinux restive

                             4. Monitoring container and troubleshooting

II: Installation Requirements

       1.64 operating system

       2. At least RHEL6.5 version of the above, the personal version is strongly recommended RHEL7.0

       3. Turn off the firewall (not required)

       4. The kernel version must be 3.10 or more, you can check the kernel version by command uname -r

Three: Installation docker

1. docker already installed, you need to uninstall

命令：yum -y remove docker   docker-client   docker-client-latest  docker-common   docker-latest  docker-latest-logrotate  docker-logrotate  docker-selinux   docker-engine-selinux  docker-engine  

Because I am a new virtual machine, docker history does not install

 

 2. Installation docker dependencies

命令：yum -y install yum-utils device-mapper-persistent-data lvm2

 

 

 There are two ways to download docker sources, one official, one is cloud Ali, Ali recommended to use personal cloud

Command: cd /etc/yum.repos.d/

Official website address: yum-config-Manager - the Add-repo HTTPS: //download.docker.com/linux/centos/docker-ce.repo

Ali Cloud Address: yum-config-Manager - the Add-repo HTTP: //mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

 

 

 

3. formal installation docker

命令：yum -y  install docker-ce

 

4. Start docker and testing

Command: systemctl start docker # start docker

Testing: docker run hello-world

 

 

 After executing the command docker, if the content is consistent with the following figure indicates success

 

 

Or enter ip a (ifconfig) will appear as shown, the installation is successful

 

 

Docker environmental information

Docker --info command for detecting correct installation, generally binding docker version command. --version command

 

 

Mirroring list of common

docker images to view mirror list Example: docker images

docker history View mirroring the historical example: docker history docker.io/centos

docker inspect the underlying information to view mirror Example: docker inspect docker.io/centos

Example docker pull download the image: docker pull centos Example: docker pull seanlook / centos: centos6

docker push image uploaded Example: docker push seanlook / mongo

docker rmi delete local mirror cases: docker rmi docker.io/centos

docker save save mirror image derived tar packets Example: docker save docker.io/busybox:latest -o busybox.tar (exported in the mirror to busybox.tar)

Example mirror docker load introduced: docker load -i Nginx .tar

 docker search image search Example: docker search docker.io/centos

docker tag name and image edit tags Example: docker tag docker.io/centos:latest cen: v1 and the image name tags docker.io latest changed cen: v1 latest set as the default

 

 Container common list

Example container docker run run: docker run -d Docker . IO / Nginx

docker ps to see running container docker ps -a to view a list of all containers docker ps -aq display only container id

See docker stop closing the container and then close the container id operation Example: docker stop b8f

docker start open container above　　

docker restart to restart the container above

After docker attach / exec attach into the container into the container exit exit will lead container is closed does not close the container docker attach b8f2 into the container when the exec exit

docker inspect the container bottom view information docker inspect b8f

docker top view a list of container docker top b8f2

To delete an error message appears first closed container docker rm delete container docker rm b8f2 container operation