https://github.com/seniverse/kube_dist

Erlang Distribution inside Kubernetes Cluster
https://github.com/seniverse/kube_dist

erlang kubernetes

Last synced: about 2 months ago
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Erlang Distribution inside Kubernetes Cluster

• Host: GitHub
• URL: https://github.com/seniverse/kube_dist
• Owner: seniverse
• License: apache-2.0
• Created: 2019-06-13T08:49:01.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-12-31T11:36:43.000Z (almost 4 years ago)
• Last Synced: 2024-10-30T16:56:17.765Z (about 2 months ago)
• Topics: erlang, kubernetes
• Language: Erlang
• Size: 19.5 KB
• Stars: 29
• Watchers: 1
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
## kube_dist

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Erlang Distribution inside Kubernetes Cluster

With `kube_dist` properly configured, name of erlang node is set to `${CONTAINER_NAME}@${POD_NAME}`.

Moreover, you may use Kubernetes's Service as your process registry.

```

gen_server:call({via, kube_endpoints, ServiceName}, Request)

```

Request would be sent to one randomly chosen pod listed in the endpoints list. If `ServiceName` is an atom, it would be sent to the container with same name. Or `ServiceName` could a tuple of two atom `{ServiceName, ContainerName}`, it would be sent to the container which name is specified in the second element of the tuple.

### Installation

add `kube_dist` dependency to your project's `rebar.config`

```

{deps, [kube_dist]}.

```

set `start_distribution` to `false` and enable `httpc` service of inets

```

[

  {kernel,

   [{start_distribution, false}]

  },

  {inets,

   [{services, [{httpc, []}]}]

  }

].

```

disable epmd daemon and set `epmd_module` to `kube_epmd` and `proto_dist` to `kube_tcp`

```

-start_epmd false

-epmd_module kube_epmd

-proto_dist kube_tcp

```

grant permission of `get` to `pods/status` and `watch` to `endpoints` to the service account of the pods

```

---

apiVersion: v1

kind: ServiceAccount

metadata:

  name: erlang-node

---

apiVersion: rbac.authorization.k8s.io/v1beta1

kind: Role

metadata:

  name: erlang-node

rules:

- apiGroups: [""]

  resources: ["pods/status"]

  verbs: ["get"]

- apiGroups: [""]

  resources: ["endpoints"]

  verbs: ["watch"]

---

apiVersion: rbac.authorization.k8s.io/v1beta1

kind: RoleBinding

metadata:

  name: erlang-node

roleRef:

  apiGroup: rbac.authorization.k8s.io

  kind: Role

  name: erlang-node

subjects:

- kind: ServiceAccount

  name: erlang-node

```

and set environment variable `CONTAINER_NAME` to container's name and add a distribution port named `${CONTAINER_NAME}-dist`

```

spec:

  serviceAccountName: erlang-node

  containers:

  - name: foo

    env:

    - name: CONTAINER_NAME

      value: foo

    ports:

    - containerPort: 4370

      name: foo-dist

```

### License

kube_dist is released under Apache 2 License. Check [LICENSE](./LICENSE) file for more information.