Using the `-p 8080:8080` option allows communication between the container on the container's port 8080 and the host's port 8080. That means if you start a mySQL container using port 3306, you wouldn't be able to access it with another application outside that container. Usually applications that use some ports in order to run (like tomcat on port 8080, mySQL on port 3306, Apache on port 80, and so) will be restricted in a container to that specific container, unable to communicate with the host or outside network. Thus, the container is now connected with outside environments. After that, you can use **port2** in order to access the service that is opened on **port1** inside the container.
By using **port1:port2** you make **port1** match with **port2**. **-p parameter** - Establishes a connection between container's port(s) to the host. **docker run** - _Runs a command in a new container_. Let's break down this simple, yet complex command. You can now start a container from an image by running this:ĭocker run -p 8080:8080 -name=tomcat tomcat Tomcat latest 24b60eaf8397 7 seconds ago 334 MB In this case, just the name "tomcat".Īfter all steps have been executed, you can test your code's functionality by typing `docker images` and you will see your image there named `tomcat` after the tomcat image we just built: The option **-t** refers to a Name of (or tag of) the image (format name:tag). In our case, the PATH is '.' (current folder).
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**docker build** - _This command builds a new image from the Dockerfile code at PATH_. You need to navigate through your directory to where the Dockerfile was saved. Docker will run an _intermediate_ container for each step in your Dockerfile during the build process, eventually creating a final image that you can export and import to other systems. # Here, we will start tomcat once the container is calledĬMD Īfter you create this Dockerfile you need to create your image. # CMD sets the first command that will run when you create containers from the resulting image. # the EXPOSE command will tell your future container to expose 8080 port to the outside # The final path to tomcat will be /usr/local/tomcat. # then decompress it and rename it to /tomcat.
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# Here we will navigate into /usr/local then download tomcat from the server This is preferred over having a RUN statement for each command # The & allows you to string multiple commands together. # The \ symbol allows you to continue the command onto the next line # RUN lets you run Linux commands inside the image. # Here we will set CATALINA_HOME (the home of the tomcat server) # The KEYWORD ENV it let us specify some Linux environment variables This is an ubuntu machine with java 8 installed on it. # Docker has a hub () where you can see all Images submitted by users and # All Dockerfiles need to start from a base Linux image. Here is an example (comments on each line describe the code): You start by creating your Dockerfile that describes the steps in order to create the base image. It will be better if you start creating and manipulating everything from the command line.
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_If you are using Mac or Windows, I suggest that you not use the Kitematic interface early on.
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You can install Kitematic for Mac OS and Windows from here () and for Linux you can type this command: Kitematic creates **VirtualBox Machines** that let you run Docker on them. I will also cover the creation and packaging of a **Java** application that runs on ().ĭocker only runs above _Linux_ but you can use it with _Mac OS_ or _Windows OS_ using **Kitematic**. These terms are the most used terms in the Docker world, and they are the main terms that I will use in this tutorial. Containers run the applications themselves. **container** - the equivalent of creating a VM from a snapshot, but again, way more lightweight. Images are the building-blocks of the containers. **image** - the snapshot of a virtual machine, but way more lightweight. It's like a recipe with all ingredients and steps necessary in making your dish. **dockerfile** - a file that describes your steps in order to create a Docker image. Let me explain some terms used in Docker: This tool is a hot product on the market right now. Docker containers ensure that code will function the same, regardless of the environment - in essence, a code incubator. This tutorial covers the basics of Docker, a container that wraps code in a complete filesystem that contains code, runtime, system tools, and system libraries. Related to DevOps (Docker, Nagios, Jenkins, Chef, Puppet, etc) Docker - A Beginner Guide
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