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Merge pull request #127 from jamtur01/readme 

Improvements to the README
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Erik Hollensbe 2014-08-08 17:30:07 -07:00
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*libswarm* is a toolkit for composing network services. *libswarm* is a toolkit for composing network services.
It defines a standard interface for services in a distributed system to communicate with each other. This lets you: It defines a standard interface for services in a distributed system to
communicate with each other. This lets you:
1. Compose complex architectures from reusable building blocks 1. Compose complex architectures from reusable building blocks
2. Avoid vendor lock-in by swapping any service out with another 2. Avoid vendor lock-in by swapping any service out with another
An extensive library of services is included, and you can also write your own using a simple API. An extensive library of services is included, and you can also write
your own using a simple API.
Here are some examples of what you can do with libswarm: Here are some examples of what you can do with libswarm:
* Aggregate all your Docker containers across multiple hosts and infrastructure providers, as if they were running on a single host. * Aggregate all your Docker containers across multiple hosts and
infrastructure providers, as if they were running on a single host.
* Bridge your in-house DNS-based service discovery with that new shiny Consul deployment, without getting locked into either. * Bridge your in-house DNS-based service discovery with that new shiny
Consul deployment, without getting locked into either.
* Swap in a new clustering and service discovery system, without changing any application code. * Swap in a new clustering and service discovery system, without
changing any application code.
* Collect logs across an in-house Mesos cluster, a Cloud Foundry deployment and individual servers staggered in 3 different datacenters, forward them to your legacy syslog deployment, then perform custom analytics on them. * Collect logs across an in-house Mesos cluster, a Cloud Foundry
deployment and individual servers staggered in 3 different
datacenters, forward them to your legacy syslog deployment, then perform
custom analytics on them.
* Simulate your entire service topology in a single process, then scale it out simply by re-arranging adapters. * Simulate your entire service topology in a single process, then scale
it out simply by re-arranging adapters.
* Organize your application as loosely coupled services from day 1,
without over-engineering.
* Organize your application as loosely coupled services from day 1, without over-engineering.
## Installation ## Installation
First get the go dependencies: You can install `libswarm` in a few simple steps. You will need to make
Go installed on your host.
1. Download the current source code.
```sh ```sh
go get github.com/docker/libswarm/... go get github.com/docker/libswarm
``` ```
Then you can compile `swarmd` with: 2. Make sure `$GOPATH/bin` is in your `$PATH`
```sh
export PATH=$GOPATH/bin:$PATH
```
3. Download or update the current dependencies.
```sh
cd $GOPATH/src/github.com/docker/libswarm
make deps
```
**NOTE:** You may also need `bzr`. On OS X, you can install it from
[here](http://wiki.bazaar.canonical.com/MacOSXDownloads) or via Home
Brew: `brew install bzr`. On Debian & Ubuntu, `apt-get install bzr` and
on Red Hat et al, `yum install bzr`.
4. Then compile `swarmd` with:
```sh ```sh
go install github.com/docker/libswarm/swarmd go install github.com/docker/libswarm/swarmd
``` ```
If `$GOPATH/bin` is in your `PATH`, you can invoke `swarmd` from the CLI. ## Running libswarm
If `$GOPATH/bin` is in your `PATH`, you can invoke `swarmd` from the
command line.
```sh ```sh
$ swarmd -h $ swarmd -h
@ -64,17 +98,18 @@ GLOBAL OPTIONS:
*Maintainer: Ben Firshman* *Maintainer: Ben Firshman*
This service runs a Docker remote API server, allowing the Docker client and This service runs a Docker remote API server, allowing the Docker client
other Docker tools to control libswarm services. With no arguments, it listens and other Docker tools to control libswarm services. With no arguments,
on port `4243`, but you can specify any port you like using `tcp://0.0.0.0:9999`, it listens on port `4243`, but you can specify any port you like using
`unix:///tmp/docker` etc. `tcp://0.0.0.0:9999`, `unix:///tmp/docker` etc.
### Docker client ### Docker client
*Maintainer: Aanand Prasad* *Maintainer: Aanand Prasad*
This service can be used to control a Docker Engine from libswarm services. It takes one argument, the Docker host to connect to. For example: `dockerclient tcp://10.1.2.3:4243` This service can be used to control a Docker Engine from libswarm
services. It takes one argument, the Docker host to connect to. For
example: `dockerclient tcp://10.1.2.3:4243`
### SSH tunnel ### SSH tunnel
@ -116,7 +151,9 @@ This service can be used to control a Docker Engine from libswarm services. It t
*Maintainer: Aanand Prasad* *Maintainer: Aanand Prasad*
Control an [Orchard](https://www.orchardup.com/) host from libswarm. It takes two arguments, an Orchard API token and the name of the Orchard host to control. Control an [Orchard](https://www.orchardup.com/) host from libswarm. It
takes two arguments, an Orchard API token and the name of the Orchard
host to control.
### Amazon EC2 ### Amazon EC2
@ -146,41 +183,42 @@ Control an [Orchard](https://www.orchardup.com/) host from libswarm. It takes tw
### Debug ### Debug
The debug service simply catches all messages and prints them on the terminal for inspection. The debug service simply catches all messages and prints them on the
terminal for inspection.
## Testing libswarm with swarmd ## Testing libswarm with swarmd
Libswarm ships with a simple daemon which can control services in your distributed system. The libswarm library ships with a simple daemon which can control services in your
distributed system.
Usage example:
### Usage examples
Run swarmd without arguments to list available services: Run swarmd without arguments to list available services:
``` ```sh
./swarmd swarmd
``` ```
Pass a service name as argument to load it: Pass a service name as argument to load it:
``` ```sh
./swarmd fakeclient swarmd fakeclient
``` ```
You can pass arguments to the service, like a shell command: You can pass arguments to the service, like a shell command:
``` ```sh
./swarmd 'dockerserver tcp://localhost:4243' swarmd 'dockerserver tcp://localhost:4243'
``` ```
You can call multiple services. They will be executed in parallel, with the output You can call multiple services. They will be executed in parallel, with
of each backend connected to the input of the next, just like unix pipelines. the output of each backend connected to the input of the next, just like
`unix` pipelines.
This allows for very powerful composition. This allows for very powerful composition.
``` ```sh
./swarmd 'dockerserver tcp://localhost:4243' 'debug' 'dockerclient unix:///var/run/docker.sock' swarmd 'dockerserver tcp://localhost:4243' 'debug' 'dockerclient unix:///var/run/docker.sock'
``` ```
## Creators ## Creators
@ -192,5 +230,5 @@ This allows for very powerful composition.
## Copyright and license ## Copyright and license
Code and documentation copyright 2013-2014 Docker, inc. Code released under the Apache 2.0 license. Code and documentation copyright 2013-2014 Docker, inc. Code released
Docs released under Creative commons. under the Apache 2.0 license. Docs released under Creative commons.