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https://github.com/aelsabbahy/miniswarm

Docker Swarm cluster in one command
https://github.com/aelsabbahy/miniswarm

cluster containers docker docker-swarm swarm swarm-cluster tutorial

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Docker Swarm cluster in one command

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# Miniswarm - Docker Swarm cluster in one command



## One command?

Yup, creating a 3 node cluster is simply:

```

miniswarm start 3

```

When you're done:

```

miniswarm delete

```



## What is Miniswarm?

Miniswarm is a tool that intends to make creating and managing a local [Docker Swarm](https://docs.docker.com/engine/swarm/) cluster as easy as possible. Miniswarm was inspired by [Minikube](https://github.com/kubernetes/minikube) which does a similar thing for kubernetes clusters. See FAQ below for info on managing a remote Swarm cluster.



The tool takes less than 10 minutes to learn, see the tutorial section below, or watch this tutorial video:

* [Miniswarm: Local Docker Swarm Cluster and Docker health check Tutorial](https://youtu.be/in1ItGKDr98)



## Prerequisites



* Docker >= 1.12

* docker-machine >= 0.7.0

* VirtualBox - Needed for local cluster, see FAQ for remote Swarm cluster



## Miniswarm: Local Docker Swarm and Docker health check tutorial (less than 10min)

In this tutorial we'll install miniswarm, create a Swarm cluster, deploy some apps and learn all the features of miniswarm in the process.



#### Install

```

# As root

curl -sSL https://raw.githubusercontent.com/aelsabbahy/miniswarm/master/miniswarm -o /usr/local/bin/miniswarm

chmod +rx /usr/local/bin/miniswarm

```



#### Start a cluster - Pick your desired size

```

# 1 manager 2 workers

miniswarm start 3



# 1 manager cluster - if you want a smaller cluster

miniswarm start



# 2 managers 3 workers - nice laptop or desktop :)

miniswarm start 2 3

```

A couple of minutes later, you should get this message

```

INFO: Stack starup complete. To connect to your stack, run the following command:

INFO: eval $(docker-machine env ms-manager0)

```



#### Visualize your cluster



This will open a browser with a nice visualization of your Docker Swarm using [docker-swarm-visualizer](https://github.com/ManoMarks/docker-swarm-visualizer)

```

miniswarm vis

```



#### Deploy your first service - This will initially be failing to showcase healtchecks



This service will be unhealthy due to failing [Goss](https://github.com/aelsabbahy/goss) healthchecks and missing dependencies. See next few steps for how we can debug and remedy this.

```

# Connect to your cluster

eval $(docker-machine env ms-manager0)



# Create a network for your service

docker network create -d overlay healthyvote_net



# Ensure network is set to driver=overlay, scope=swarm

docker network ls



# Create your first service

docker service create -p 8080:80 --replicas 2 --network healthyvote_net --name vote aelsabbahy/healthyvote

```



#### Inspect the service health

```

# Wait for the service to finish preparing, but it won't ever be ready due to failing health

docker service ls

docker service ps vote



# Lets look at the healthchecks using miniswarm

# -a shows all containers, including exited/failed containers

miniswarm health vote -a

```



We should see something like this:

```

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] ======

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Start: 2016-08-07 22:39:03.748704565 +0000 UTC

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] ======

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] .F

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Failures/Skipped:

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Title: Redis backend is reachable

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Meta:

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]     remedy.1: Deploy redis service if you haven't already

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]     remedy.2: ctrl-alt-delete

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]     remedy.3: take a nap aka human ctrl-alt-delete

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Addr: tcp://redis:6379: reachable:

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Expected

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]     : false

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] to equal

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]     : true

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q]

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Total Duration: 0.500s

[ms-worker0 vote.2.630mookf9pnc8dip5hl7yng3q] Count: 2, Failed: 1, Skipped: 0

```



#### Deploy missing dependencies



Lets remedy the healthcheck issue



```

docker service create --replicas 1 --network healthyvote_net --name redis redis



# Wait for it to show up in `miniswarm vis` or by using CLI

docker service ls

docker service ps redis



# Now that redis is deployed, the  vote service should now be running

docker service ls



# And the health..

miniswarm health vote

```



#### Open service in browser

```

# Open app in browser

miniswarm service vote



# print url, but don't open (--url has to be at the end for now)

miniswarm service vote --url

```



#### View the logs

```

miniswarm logs vote



# Tail the log file (-f has to be at the end for now)

miniswarm logs vote -f

```



#### Scale down your cluster

```

# Take a look at `miniswarm vis` GUI to see the services move around as we scale down

miniswarm scale 2

```



#### Delete your cluster

```

miniswarm delete

```



# FAQ

## Can this be used to manage a remote Swarm cluster?

The tool was written with local Swarm cluster in mind. That said, it can probably be used to manage a remote Swarm clusters, but that hasn't been tested. Take a look at MACHINE_DRIVER variable at the top of the script.



In theory, if you set the MACHINE_DRIVER variable to the driver you want + any required variables from the driver itself, see [supported drivers](https://docs.docker.com/machine/drivers/) it should just work. Feel free to submit a pull-request to improve this or add more support.



## How do I disable the color output?



```

MS_NOCOLOR=1 miniswarm ..



# or

export MS_NOCOLOR=1

miniswarm ...

```



## Does this work on Mac/OSX?

It should, but I don't own a Mac, so I depend on others to verify it. So.. if something is broke on mac, please submit a pull request.



## Why did you use Goss for healthchecks?

Mostly shameless self-promotion, and while we're on the topic, check out:

* [Goss](https://github.com/aelsabbahy/goss) - Project page

* [blog post](https://medium.com/@aelsabbahy/docker-1-12-kubernetes-simplified-health-checks-and-container-ordering-with-goss-fa8debbe676c) - Using Goss with Docker healthchecks and Kubernetes



## Why the #$@^%$ is this written in Bash?



Two reasons:



1. I though it was going to be ~100 lines of bash, I was wrong.. very wrong :(.

2. I want users to be able to look at this script and see all the commands needed to set up a Swarm cluster.

  * Go would be great for this tool, especially by leveraging the Docker go packages directly, but then the tool will be more of a blackbox to new users



## I'm getting intermittent network issues, why is this happening?

Honestly, I don't know.. I see them too. Either I'm doing something dumb, or Docker Swarm mode has intermittent DNS issues. Hopefully with more users we can get to the bottom of this.



## Why is healthyvote not a Docker automated build?

Because Dockerhub doesn't support HEALTHCHECK in Dockerfile yet. The code for this image can be found in the [healthyvote/](https://github.com/aelsabbahy/miniswarm/tree/master/healthyvote) folder.



## Why does this suck?



Because it's a quick hack I did over the weekend.. or I suck.. maybe both?



## I tried to use it and got an error



Open an issue, create a pull request.. contribute! :)



## Why is the CLI parsing so bad?



See the last two questions.



## Social Media:

* [![Twitter Follow](https://img.shields.io/twitter/follow/aelsabbahy1.svg?style=social&label=Follow&maxAge=2592000)]() - Stay updated on new releases

* [![Twitter URL](https://img.shields.io/twitter/url/http/shields.io.svg?style=social&maxAge=2592000)](https://twitter.com/intent/tweet?text=Check%20out%20Miniswarm%3A%20Docker%20Swarm%20cluster%20in%20one%20command%20https%3A%2F%2Fgithub.com%2Faelsabbahy%2Fminiswarm%20%23devops%20%23docker) - If you like miniswarm, spread the word!

* [Blog](https://medium.com/@aelsabbahy) - See what I'm ranting about