Go bindings for Apache Mesos

Very early version of a pure Go language bindings for Apache Mesos. As with other pure implmentation, mesos-go uses the HTTP wire protocol to communicate directly with a running Mesos master and its slave instances. One of the objectives of this project is to provide an idiomatic Go API that makes it super easy to create Mesos frameworks using Go.

![GoDoc] (https://godoc.org/github.com/mesos/mesos-go?status.png)

Current Status

This is a very early version of the project. Howerver, here is a list of things that works so far:

• The SchedulerDriver API implemented
• The ExecutorDriver API implemented
• Stable API (based on the core Mesos code)
• Plenty of unit and integrative of tests
• Modular design for easy readability/extensibility
• Example programs on how to use the API
• Leading master detection
• Authentication via SASL/CRAM-MD5

Pre-Requisites

• Go 1.3 or higher
• A standard and working Go workspace setup
• Apache Mesos 0.19 or newer
• godep

Optional

• Install Protocol Buffer tools 2.5 locally - See http://code.google.com/p/protobuf/
• GNU Make

Build Instructions

The following instructions is to build the code from github.The project uses the GoDep for dependency management.

$ cd <go-workspace>/src/
$ mkdir -p github.com/mesos
$ cd github.com/mesos
$ git clone https://github.com/mesos/mesos-go.git
$ cd mesos-go
$ go get github.com/tools/godep
$ godep restore
$ go build ./...

The previous will build the code base.

Building the Examples

Use the following steps to build the example scheduler and executor:

$ cd <go-workspace>/src/github.com/mesos/mesos-go/examples

# build example-scheduler
$ go build -tags=example-sched -o example-scheduler example_scheduler.go

# build example-executor
$ go build -tags=example-exec -o example-executor example_executor.go

Or by using the top level Makefile:

$ cd <go-workspace>/src/github.com/mesos/mesos-go

# build example-scheduler
$ make example-scheduler

# build example-executor
$ make example-executor

# build example-scheduler and example-executor at the same time
$ make examples

Running the Example

Start Mesos

You will need a running Mesos master and slaves to run the examples. For instance, start a local Mesos:

$ <mesos-build-install>/bin/mesos-local --ip=127.0.0.1 --port=5050

See http://mesos.apache.org/gettingstarted/ for getting started with Apache Mesos.

Running the Go Scheduler/Executor Examples

$ cd <go-workspace>/src/github.com/mesos/mesos-go
$ cd examples
$ ./example-scheduler --master=127.0.0.1:5050 --executor="<go-workspace>/src/github.com/mesos/mesos-go/examples/example-executor" --logtostderr=true

Note: you must provide the fully-qualified path to the example-executor binary. If all goes well, you should see output about task completion. You can also point your browser to the Mesos GUI http://127.0.0.1:5050/ to validate the framework activities.

Running the Go Scheduler with Other Executors

You can also use the Go example-scheduler with executors written in other languages such as Python or Java for further validation (note: to use these executors requires a build of the mesos source code with make check):

$ ./example-scheduler --master=127.0.0.1:5050 --executor="<mesos-build>/src/examples/python/test-executor" --logtostderr=true

Similarly for the Java version:

$ ./example-scheduler --master=127.0.0.1:5050 --executor="<mesos-build>/src/examples/java/test-executor" --logtostderr=true