Let’s curl our new site: > curl localhost:49153Ĭurl: (7) Failed connect to localhost:49153 Connection refused Under the PORTS heading, we can see our container exposes port 80, and Docker has forwarded this port from the container to a random port, 49153, on the host. Verify the container is running: > docker psĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĠ092c03e1eba nginx:latest nginx 44 seconds ago Up 41 seconds 0.0.0.0:49153->80/tcp web Our new container has the unique identifier 0092c03e1eba. This command starts a new container as a daemon ( -d), automatically forwards the ports specified in the image ( -P), gives it the name ‘web’ ( -name web), and uses the nginx image. The Problem: Docker forwards ports from the container to the host, which is boot2docker, not OS X. Let’s see where it falls apart and how we can fix it. The VM runs the Docker server, and we’re communicating with it using the Docker client on OS X.īueno. To recap: we’ve set up a VirtualBox VM running boot2docker.
You probably want to add that environment variable to your shell config. ☞ Your VM might have a different IP address-use whatever boot2docker up told you to use. We need to tell it to use our boot2docker VM by setting the DOCKER_HOST environment variable: > export DOCKER_HOST=tcp://192.168.59.103:2375 The Docker client assumes the Docker host is the current machine. Step 4: Set the DOCKER_HOST environment variable Do like it says: > boot2docker upġ 13:51:29 Waiting for VM to be started.ġ 13:51:51 Trying to get IP one more timeġ 13:51:51 To connect the Docker client to the Docker daemon, please set:ġ 13:51:51 export DOCKER_HOST=tcp://192.168.59.103:2375
#Mac os docker codeplay computercpp iso#
> brew updateįirst, we need to initialize boot2docker (we only have to do this once): > boot2docker initġ 13:49:33 Downloading boot2docker ISO image.ġ 13:49:50 Done. I prefer homebrew because I like to manage my environment from the command line. You have two choices: the offical package from the Docker site or homebrew. This also means boot2docker, not OS X, is the Docker host, not OS X. We’ll run the Docker client natively on OS X, but the Docker server will run inside our boot2docker VM. Here’s a diagram of how we’ll use boot2docker: boot2docker is a “lightweight Linux distribution made specifically to run Docker containers.” Spoiler alert: you’re going to run it in a VM on your Mac. We still need to have Linux running somewhere.Įnter boot2docker.
It doesn’t have the kernel features required to run Docker containers natively. Here’s the thing about OS X: it’s not Linux. The laptop is running both the client and the server, thus making it the Docker host.
Suppose we want to run containers directly on our Linux laptop. The host can be any machine-your laptop, a server in the Cloud™, etc-but, because Docker uses features only available to Linux, that machine must be running Linux (more specifically, the Linux kernel). The machine running the Docker server is called the Docker host. You will interact with Docker by using the client to send commands to the server. The Docker client is a command line program that communicates with the Docker server using the REST API. It exposes a REST API for remote management. The Docker server is a daemon that does all the heavy lifting: building and downloading images, starting and stopping containers, and the like. How Docker Worksĭocker is a client-server application. Don’t say I never gave you nothing.įirst, let’s talk about how Docker works and why running it on OS X no work so good. Plus, if you decide to dig deeper into Docker on your Mac, you’ll be saved hours of troubleshooting. You’ll get a better understanding of how Docker works in general and on OS X specifically. It’s not meant to be a tutorial on Docker itself, but I encourage you to follow along and type in all the commands. This post is a walkthrough of the issues you’ll face running Docker on OS X and the workarounds to deal with them. This isn’t the book’s fault rather, it speaks to underlying issues with how Docker works on OS X. After a certain point, the book assumes you’re using Linux and skips some of the extra configuration required to make the examples work on OS X. It’s a top notch book and I highly recommend it, but I’ve had some problems running the examples on OS X. Recently, I’ve been working through The Docker Book. It has the potential to change all aspects of server-side applications, from development and testing to deployment and scaling.
You should call your mom.”ĭocker is a program that makes running and managing containers super easy. Even my dad’s like, “what’s Docker? I saw someone twitter about it on the Facebook. Have you heard of Docker? You probably have-everybody’s talking about it.
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