Nomad is a cluster manager, designed for both long lived services and short lived batch processing workloads. Developers use a declarative job specification to submit work, and Nomad ensures constraints are satisfied and resource utilization is optimized by efficient task packing. Nomad supports all major operating systems and virtualized, containerized, or standalone applications.
The key features of Nomad are:
Docker Support: Jobs can specify tasks which are Docker containers. Nomad will automatically run the containers on clients which have Docker installed, scale up and down based on the number of instances requested, and automatically recover from failures.
Multi-Datacenter and Multi-Region Aware: Nomad is designed to be a global-scale scheduler. Multiple datacenters can be managed as part of a larger region, and jobs can be scheduled across datacenters if requested. Multiple regions join together and federate jobs making it easy to run jobs anywhere.
Operationally Simple: Nomad runs as a single binary that can be either a client or server, and is completely self contained. Nomad does not require any external services for storage or coordination. This means Nomad combines the features of a resource manager and scheduler in a single system.
Distributed and Highly-Available: Nomad servers cluster together and perform leader election and state replication to provide high availability in the face of failure. The Nomad scheduling engine is optimized for optimistic concurrency allowing all servers to make scheduling decisions to maximize throughput.
HashiCorp Ecosystem: Nomad integrates with the entire HashiCorp ecosystem of tools. Along with all HashiCorp tools, Nomad is designed in the unix philosophy of doing something specific and doing it well. Nomad integrates with tools like Packer, Consul, and Terraform to support building artifacts, service discovery, monitoring and capacity management.
For more information, see the introduction section of the Nomad website.
Getting Started & Documentation
All documentation is available on the Nomad website.
If you wish to work on Nomad itself or any of its built-in systems, you will first need Go installed on your machine (version 1.8+ is required).
Developing with Vagrant There is an included Vagrantfile that can help bootstrap the process. The created virtual machine is based off of Ubuntu 14, and installs several of the base libraries that can be used by Nomad.
To use this virtual machine, checkout Nomad and run
vagrant up from the root
of the repository:
$ git clone https://github.com/hashicorp/nomad.git $ cd nomad $ vagrant up
The virtual machine will launch, and a provisioning script will install the needed dependencies.
For local dev first make sure Go is properly installed, including setting up a
GOPATH. After setting up Go, clone this
$GOPATH/src/github.com/hashicorp/nomad. Then you can
download the required build tools such as vet, cover, godep etc by bootstrapping
$ make bootstrap ...
make test. This will run the tests. If this exits with exit status 0,
then everything is working!
$ make test ...
To compile a development version of Nomad, run
make dev. This will put the
Nomad binary in the
$ make dev ... $ bin/nomad ...
To cross-compile Nomad, run
make bin. This will compile Nomad for multiple
platforms and place the resulting binaries into the
$ make bin ... $ ls ./pkg ...