Docker practice: From getting started to practice

Docker practice: From getting started to practice
I. What is Docker?

Docker is a docker. When it becomes a technology, it also serves as a docker. The official website describes it as follows: "Docker is a development platform used to build, publish, and run distributed applications for developers and system administrators ." That is to say, if you compare your application to a cargo, the Docker will quickly load them onto the ship using containers. Fast, simple, and efficient.

It is written in the Go language and is the "Container" for running programs (Linux containers), implementing application-level isolation (sandbox ). Multiple containers are mutually affected during runtime, ensuring security and stability.

I like it because it is fast deployment, safe operation, and does not pollute my system.

Ii. Try it now!

The official website provides an interactive tutorial to help you easily understand the basic usage of Docker. Please try it now!

Iii. Installation

The official website directly supports installing Docker on 64-bit Linux. However, if you want to run Docker on a 32-bit Linux system, some attempts have been made. For example, in 32Ubuntu, click to open the link.

For installation of other systems, refer to the official website. The following describes how to install them in Ubuntu14.04.

1. Add the image to the program source:

~$ sudo sh -c "echo deb http://mirror.yandex.ru/mirrors/docker/ docker main > /etc/apt/sources.list.d/docker.list"

2. Then update

$ sudo apt-get update

3. fix it if an error is reported:

W: GPG error: http://mirror.yandex.ru docker Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D8576A8BA88D21E9

Solve this error:

$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys D8576A8BA88D21E9Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.RmJ1SUpsXX --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys D8576A8BA88D21E9gpg: requesting key A88D21E9 from hkp server keyserver.ubuntu.comgpg: key A88D21E9: public key "Docker Release Tool (releasedocker) <docker@dotcloud.com>" importedgpg: Total number processed: 1gpg:               imported: 1  (RSA: 1)

4. Download docker:

$ sudo apt-get install lxc-docker

Wait for the download to complete.

In addition, this command may help:

$ curl -sSL https://get.docker.com/ubuntu/ | sudo sh

Iv. Preliminary use
Enter docker in the terminal to print out the docker command list:

Commands:    attach    Attach to a running container    build     Build an image from a Dockerfile    commit    Create a new image from a container's changes    cp        Copy files/folders from a container's filesystem to the host path    create    Create a new container    diff      Inspect changes on a container's filesystem    events    Get real time events from the server    exec      Run a command in a running container    export    Stream the contents of a container as a tar archive    history   Show the history of an image    images    List images    import    Create a new filesystem image from the contents of a tarball    info      Display system-wide information    inspect   Return low-level information on a container    kill      Kill a running container    load      Load an image from a tar archive    login     Register or log in to a Docker registry server    logout    Log out from a Docker registry server    logs      Fetch the logs of a container    port      Lookup the public-facing port that is NAT-ed to PRIVATE_PORT    pause     Pause all processes within a container    ps        List containers    pull      Pull an image or a repository from a Docker registry server    push      Push an image or a repository to a Docker registry server    restart   Restart a running container    rm        Remove one or more containers    rmi       Remove one or more images    run       Run a command in a new container    save      Save an image to a tar archive    search    Search for an image on the Docker Hub    start     Start a stopped container    stop      Stop a running container    tag       Tag an image into a repository    top       Lookup the running processes of a container    unpause   Unpause a paused container    version   Show the Docker version information    wait      Block until a container stops, then print its exit code

Next we can try to use these commands, but before proceeding to the next step, we should first understand several concepts.

5. Important Concepts

1. image

An image is a read-only template. For example, an image can contain a complete Ubuntu system and install apache.

Images can be used to create Docker containers.

Other people make images, so we can use them easily. This is what attracts me.

2. Docker container

Docker uses containers to run applications. A container is an instance created from an image (object-oriented feeling, class, and object). It can be started, started, stopped, and deleted.

3. Warehouse

This is a place where images are stored. For example, the largest public repository is Docker Hub.

6. Several Simple practices

1. search

Search for the wordpress blog image in the repository, as shown below:

$ docker search wordpressNAME                                   DESCRIPTION                                     STARS     OFFICIAL   AUTOMATEDwordpress                              The WordPress rich content management syst...   185       [OK] 

2. Download this image

$ docker pull wordpresswordpress:latest: The image you are pulling has been verified

3. view your own image

$ docker imagesREPOSITORY               TAG                 IMAGE ID            CREATED             VIRTUAL SIZElinc-wiki                latest              b5a1e34b01c2        27 hours ago        689.7 MBubuntu                   latest              5ba9dab47459        5 days ago          188.3 MBwordpress                latest              ecc04d6d638c        6 days ago          470 MB

4. Simple operation
Run wordpress to configure mysql. run ubuntu to demonstrate run.

$ docker run -it ubuntu /bin/bashroot@46ff2a695ce1:/# echo "I am linc"I am linc

Now, the experience is over. There will be more exciting practices in the future, waiting for us, Docker, We are here!

Refer:

Https://docs.docker.com/installation/ubuntulinux/

Https://bitnami.com/stack/mediawiki

Https://docs.docker.com/userguide/

Https://dockerpool.com/static/books/docker_practice

Http://zhumeng8337797.blog.163.com/blog/static/1007689142014524115743806/

Http://www.cnblogs.com/imoing/p/dockervolumes.html

Https://github.com/docker/fig/issues/88