Docker
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## Install Docker
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###on-ubuntu-16-04
source : https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04

    sudo apt-get update
    sudo apt-key adv ā€“keyserver hkp://p80.pool.sks-keyservers.net:80 ā€“recv-keys 58118E89F3A912897C070ADBF76221572C52609D
    echo ā€œdeb https://apt.dockerproject.org/repo ubuntu-xenial mainā€¯ | sudo tee /etc/apt/sources.list.d/docker.list
    sudo apt-get update
    apt-cache policy docker-engine

You should see output similar to the follow:

    Output of apt-cache policy docker-engine
    docker-engine:
    Installed: (none)
    Candidate: 1.11.1-0~xenial
    Version table:
    1.11.1-0~xenial 500
    500 https://apt.dockerproject.org/repo ubuntu-xenial/main amd64 Packages
    1.11.0-0~xenial 500
    500 https://apt.dockerproject.org/repo ubuntu-xenial/main amd64 Packages


    sudo apt-get install -y docker-engine
    sudo systemctl status docker

The output should be similar to the following, showing that the service is active and running:

    Output
    ā—¸ docker.service ā€“ Docker Application Container Engine
    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
    Active: active (running) since Sun 2016-05-01 06:53:52 CDT; 1 weeks 3 days ago
    Docs: https://docs.docker.com
    Main PID: 749 (docker)


###Executing the Docker Command Without Sudo (Optional)

    sudo usermod -aG docker $(whoami)

now you must logout to ensure all privilage is write
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## RUN or START
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run : runs an image

start : starts a container.

The docker run doc does mention:
The docker run command first creates a writeable container layer over the specified image, and then starts it using the specified command.

That is, docker run is equivalent to the API /containers/create then /containers/(id)/start.
You do not run an existing container, you docker exec to it (since docker 1.3).
You can restart an exited container.

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## Docker HUB
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    https://hub.docker.com/
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## MySQl and WordPress with Docker
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    docker run -v /var/lib/mysql ā€“name farid-some-mysql -e MYSQL_ROOT_PASSWORD=zanjan -e MYSQL_DATABASE=wordpress -d mysql
    docker run -it -v /home/sinic/wordpress:/var/www/html/wp-content/ -p 8080:1395 ā€“name farid-some-ubuntu3 ā€“link farid-some-mysql:mysql ubuntu/apache:wordpress
### How To Use MYSQL in Wordpress container
    define(ā€˜DB_NAMEā€™, exec(ā€˜echo $MYSQL_DATABASEā€™));

    /** MySQL database username */
    define(ā€˜DB_USERā€™, ā€˜rootā€™);

    /** MySQL database password */
    define(ā€˜DB_PASSWORDā€™, exec(ā€˜echo $MYSQL_ENV_MYSQL_ROOT_PASSWORDā€™));

    /** MySQL hostname */
    define(ā€˜DB_HOSTā€™, exec(ā€˜echo $MYSQL_PORT_3306_TCP_ADDRā€™));

    /** Database Charset to use in creating database tables. */
    define(ā€˜DB_CHARSETā€™, ā€˜utf8ā€™);

    /** The Database Collate type. Donā€™t change this if in doubt. */
    define(ā€˜DB_COLLATEā€™, ā€¯);
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## How To MONITOR containers
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    docker ps
    docker ps -a
    docker stats
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## How To Copy files in a container
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    docker cp Downloads/wordpress-4.5.2-fa_IR.zip kickass_thompson:/var/www/html
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## Export and Import Images
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You will need to save the docker image as a tar file:

    docker save -o <save image to path> <image name>
Then copy your image to a new system with regular file transfer tools such as cp or scp. After that you will have to load the image into docker:

    docker load -i <path to image tar file>
PS: You may need to sudo all commands.

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## Networking modes
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    docker run ā€“net=ā€¯bridgeā€¯ (default)
    docker run ā€“net=ā€¯hostā€¯
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## Detach fron a running container
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If you do ā€œdocker attach ā€œcontainer idā€¯ you get into the container. To exit from the container without stopping the container you need to enter ā€œCtrl+P+Qā€¯
better to Ctrl+P and Ctrl+Q
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## Open new shell in a container 
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    docker exec -it sinic-osticket bash
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_BY: Farid Ahmadian_  
_TAG: docker_  
_DATE: 2016-08-1 10:36:53_