4. Let's use Dockerfile

You can build Docker Images using writing the instructions in Dockerfile.

We are going to use some basic dockerfile instructions to get the idea.

4-1. Dockerfile 101

1. Create workspace directory on you Mac
   $ mkdir -p ~/workspace/docker/dockerfiles
$ cd ~/workspace/docker/dockerfiles

2. Create Dockerfile
   $ vi df-apache-01

   FROM ubuntu:14.04
   RUN apt-get -y install apache2
   CMD ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]
   

   We use ubuntu 14.04 as a base image.
   Install apache2 on the new image.
   When you run container from the new image, execute the apache2ctl

3. Build docker image using Dockerfile
   $ docker build -f df-apache-01 -t apache-01 .

   Don't forget . (current directory) at the end.

   [AKIRA@^_^:dockerfiles]$ docker build -f df-apache-01 -t apache-01 .
   Sending build context to Docker daemon 6.144 kB
   Step 0 : FROM ubuntu:14.04
   14.04: Pulling from library/ubuntu
   

   You just built apache-01 docker image.
   $ docker images

4. Run container from newly built image binding port 80
   $ docker run -itd -p 80:80 apache-01

   -d flag means detached mode

   [AKIRA@^_^:dockerfiles]$ docker run -itd -p 80:80 apache-01
   8522deea82e2ec44aedbf4617bf32387ed9917b070a9e6993f4dca42c06fd5ba
   

   This docker run command binds port 80 on the container to port 80 on the host with -p flag.

   NOTE:
   -p [host port no] : [container port no]

5. Get the IP Address of your Docker Host (vm-appcat01)
   $ docker-machine ls

   [AKIRA@^_^:dockerfiles]$ docker-machine ls
   NAME        ACTIVE DRIVER            STATE   URL                       SWARM
   vm-appcat01 *      vmwareappcatalyst Running tcp://172.16.194.149:2376
   

6. Check to see if your web server is up and running.
   

   Apache2 default page is shown.

7. Stop the container
   $ docker stop $(docker ps -p)

4-2. Use ADD instruction to add files to docker image

1. Create a Web page（index.html）
   $ vi index.html

   <h1>Who's your Daddy?</h1>
   

2. Create Dockerfile
   $ vi df-apache-02

   FROM ubuntu:14.04
   RUN apt-get update && apt-get -y install apache2
   ADD index.html /var/www/html/index.html
   EXPOSE 80
   CMD ["/usr/sbin/apache2ctl", "-D", "FOREGROUND" ]
   

   Look at the "ADD" line.
   This instruction is to ADD index.html on your current directory to the path in docker image

   (/var/www/html/index.html is the default web page)

3. Build
   $ docker build -f df-apache-02 -t apache-02 .

   [AKIRA@^_^:dockerfiles]$ docker build -f df-apache-02 -t apache-02 .
   Sending build context to Docker daemon 6.144 kB
   Step 0 : FROM ubuntu:14.04
    ---> 91e54dfb1179
   Step 1 : RUN apt-get update && apt-get -y install apache2
    ---> Running in 12f7c312923a
   

   You created the image called apache-02
   $ docker images

4. Run container from apache-02
   $ docker run -itd -p 80:80 apache-02

   [AKIRA@^_^:dockerfiles]$ docker run -itd -p 80:80 apache-02
   df0b304667534562e7219e7be11192f80f2621d5417c76d79d6cd0ad3a75b0ae
   

5. Check the IP Address
   $ docker-machine ls

   [AKIRA@^_^:dockerfiles]$ docker-machine ls
   NAME        ACTIVE DRIVER            STATE   URL                       SWARM
   vm-appcat01 *      vmwareappcatalyst Running tcp://172.16.194.149:2376
   

6. Access the Web Site using browser.

   

   You can see that index.html you specified was ADDed to new image and container.

7. Stop the container.
   $ docker stop $(docker ps -q)

4-3. Volume

1. Create Dockerfile
   $ vi df-apache-03

   FROM ubuntu:14.04
   VOLUME [ "/var/www/html" ]
   ADD index.html /var/www/html/index.html
   RUN apt-get update && apt-get -y install apache2
   EXPOSE 80
   CMD ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]
   

2. Build
   $ docker build -f df-apache-03 -t apache-03 .

   [AKIRA@^_^:dockerfiles]$ docker build -f df-apache-03 -t apache-03 .
   Sending build context to Docker daemon 6.144 kB
   Step 0 : FROM ubuntu:14.04
    ---> 91e54dfb1179
   Step 1 : VOLUME /var/www/html
    ---> Running in 899612eb6fd4
    ---> e718ae690d57
   Removing intermediate container 899612eb6fd4
   Step 2 : ADD index.html /var/www/html/index.html
    ---> 62b0180d278e
   Removing intermediate container 56dee1e0b6ff
   Step 3 : RUN apt-get update && apt-get -y install apache2
    ---> Running in c69ae7b84d75
   

3. Run
   $ docker run -itd -v ~/workspace/docker/dockerfiles/index.html:/var/www/html/index.html -p 80:80 apache-03

   [AKIRA@^_^:dockerfiles]$ docker run -itd -v ~/workspace/docker/dockerfiles/index.html:/var/www/html/index.html -p 80:80 apache-03
   6f580d359ea82ace71469b13a5f43bc5a7bf130401f1454fa98929417560e9e6
   

   -v flag
   mounting local index.html to /var/www/html/index.html in the container

4. IP Address of vm-appcat01
   $ docker-machine ls

   [AKIRA@^_^:dockerfiles]$ docker-machine ls
   NAME        ACTIVE DRIVER            STATE   URL                       SWARM
   vm-appcat01 *      vmwareappcatalyst Running tcp://172.16.194.149:2376
   

5. Access the web site with browser
   

6. Edit your local index.html
   $vi index.html

   <h1>Who's got the last laugh now?</h1>
   

7. Reload your browser
   

   You didn't have to re-build the image after editing index.html.

8. Stop the container
   $docker stop $(docker ps -q)