145 lines
4.1 KiB
Markdown
145 lines
4.1 KiB
Markdown
Nomad Codebase Documentation
|
|
===
|
|
|
|
This directory contains some documentation about the Nomad codebase,
|
|
aimed at readers who are interested in making code contributions.
|
|
|
|
If you're looking for information on _using_ Nomad, please instead refer
|
|
to the [Nomad website](https://nomadproject.io).
|
|
|
|
Developing with Vagrant
|
|
---
|
|
A development environment is supplied via Vagrant to make getting started easier.
|
|
|
|
1. Install [Vagrant](https://www.vagrantup.com/docs/installation)
|
|
1. Install [Virtualbox](https://www.virtualbox.org/)
|
|
1. Bring up the Vagrant project
|
|
```sh
|
|
$ 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 within the VM.
|
|
|
|
1. SSH into the VM
|
|
```sh
|
|
$ vagrant ssh
|
|
```
|
|
|
|
Developing without Vagrant
|
|
---
|
|
1. Install [Go 1.21.5+](https://golang.org/) *(Note: `gcc-go` is not supported)*
|
|
1. Clone this repo
|
|
```sh
|
|
$ git clone https://github.com/hashicorp/nomad.git
|
|
$ cd nomad
|
|
```
|
|
1. Bootstrap your environment
|
|
```sh
|
|
$ make bootstrap
|
|
```
|
|
1. (Optionally) Set a higher ulimit, as Nomad creates many file handles during normal operations
|
|
```sh
|
|
$ [ "$(ulimit -n)" -lt 1024 ] && ulimit -n 1024
|
|
```
|
|
1. Verify you can run smoke tests
|
|
```sh
|
|
$ make test
|
|
```
|
|
**Note:** You can think of this as a `smoke` test which runs a subset of
|
|
tests and some may fail because of `operation not permitted` error which
|
|
requires `root` access. You can use `go test` to test the specific subsystem
|
|
which you are working on and let the CI run rest of the tests for you.
|
|
|
|
Running a development build
|
|
---
|
|
1. Compile a development binary (see the [UI README](https://github.com/hashicorp/nomad/blob/main/ui/README.md) to include the web UI in the binary)
|
|
```sh
|
|
$ make dev
|
|
# find the built binary at ./bin/nomad
|
|
```
|
|
1. Start the agent in dev mode
|
|
```sh
|
|
$ sudo bin/nomad agent -dev
|
|
```
|
|
1. (Optionally) Run Consul to enable service discovery and health checks
|
|
1. Download [Consul](https://www.consul.io/downloads)
|
|
1. Start Consul in dev mode
|
|
```sh
|
|
$ consul agent -dev
|
|
```
|
|
|
|
Compiling Protobufs
|
|
---
|
|
If in the course of your development you change a Protobuf file (those ending in .proto), you'll need to recompile the protos.
|
|
|
|
1. Run `make boostrap` to install the [`buf`](https://github.com/bufbuild/buf)
|
|
command.
|
|
1. Compile Protobufs
|
|
```sh
|
|
$ make proto
|
|
```
|
|
|
|
Building the Web UI
|
|
---
|
|
See the [UI README](https://github.com/hashicorp/nomad/blob/main/ui/README.md) for instructions.
|
|
|
|
Create a release binary
|
|
---
|
|
To create a release binary:
|
|
|
|
```sh
|
|
$ make prerelease
|
|
$ make release
|
|
$ ls ./pkg
|
|
```
|
|
|
|
This will generate all the static assets, compile Nomad for multiple
|
|
platforms and place the resulting binaries into the `./pkg` directory.
|
|
|
|
API Compatibility
|
|
--------------------
|
|
Only the `api/` and `plugins/` packages are intended to be imported by other projects. The root Nomad module does not follow semver and is not intended to be imported directly by other projects.
|
|
|
|
## Architecture
|
|
|
|
The code for Nomad's major components is organized as:
|
|
|
|
* `api/` provides a Go client for Nomad's HTTP API.
|
|
* `client/` contains Nomad's client agent code.
|
|
* `command/` contains Nomad's CLI code.
|
|
* `nomad/` contains Nomad's server agent code.
|
|
* `ui/` contains Nomad's UI code.
|
|
* `website/` contains Nomad's website and documentation.
|
|
|
|
The high level control flow for many Nomad actions (via the CLI or UI) are:
|
|
|
|
```
|
|
# Read actions:
|
|
Client -> HTTP API -> RPC -> StateStore
|
|
|
|
# Actions that change state:
|
|
Client -> HTTP API -> RPC -> Raft -> FSM -> StateStore
|
|
```
|
|
|
|
Checklists
|
|
---
|
|
|
|
When adding new features to Nomad there are often many places to make changes.
|
|
It is difficult to determine where changes must be made and easy to make
|
|
mistakes.
|
|
|
|
The following checklists are meant to be copied and pasted into PRs to give
|
|
developers and reviewers confidence that the proper changes have been made:
|
|
|
|
* [New `jobspec` entry](checklist-jobspec.md)
|
|
* [New CLI command](checklist-command.md)
|
|
* [New RPC endpoint](checklist-rpc-endpoint.md)
|
|
|
|
Tooling
|
|
---
|
|
|
|
* [Go tool versions](golang.md)
|