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etcdadm

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[EOL] etcdadm is a command-line tool for operating an etcd cluster

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etcdadm
=======

etcdadm is a command-line tool for operating an etcd cluster. It makes it easy to create a new cluster, add a member to, or remove a member from an existing cluster. Its user experience is inspired by [kubeadm](https://kubernetes.io/docs/reference/setup-tools/kubeadm/).

For major project goals, see the [roadmap](ROADMAP.md)

## Table of Contents

- [Getting Started](#getting-started)
    - [Building](#building)
    - [Creating a new cluster](#creating-a-new-cluster)
    - [Adding a member](#adding-a-member)
    - [Removing a member](#removing-a-member)
  - [Advanced Usage](#advanced-usage)
    - [Creating a new cluster from a snapshot](#creating-a-new-cluster-from-a-snapshot)
  - [Caveats & Limitations](#caveats-and-limitations)
  - [Design](#design)
  - [Questions](#questions)

## Getting Started

### Building

1. Clone the git repository.
1. Build on the host:
   ```
   make etcdadm
   ```
1. Build in a container, using docker:
   ```
   make container-build
   ```
    _If you are in a country/region where Internet access is restricted and you cannot download Go dependencies successfully, `make` with the `GOPROXY` environment variable set to a third party you trust, for example:_
   ```
   GOPROXY=https://goproxy.io make container-build
   ```
   _`goproxy.io` is not endorsed specifically by the project._

### Creating a new cluster

1. Copy `etcdadm` to each machine that will become a member.
2. Choose one machine and run

```
etcdadm init
```

### Adding a member

1. Copy the CA certificate and key from any machine in the cluster to the machine being added.

```
rsync -avR /etc/etcd/pki/ca.* <Member IP address>:/
```
2. Choose a cluster endpoint (i.e. client URL of some member) and run

```
etcdadm join <endpoint>
```

### Removing a member

On the machine being removed, run

```
etcdadm reset
```

## Advanced Usage

### Creating a new cluster from a snapshot

If you have an existing etcd snapshot, you can use it to create a new cluster:

```
etcdadm init --snapshot /path/to/etcd.snapshot
```

## Caveats and Limitations

1. Must run as root. (This is because etcdadm creates a systemd service)
2. Does not support etcd v2.
3. Currently tested on Container Linux, with plans for other platforms.

## Design

The goal of etcdadm is to make it easy to operate an etcd cluster. It downloads a specific etcd release, installs the binary, configures a systemd service, generates certificates, calls the etcd API to add (or remove) a member, and verifies that the new member is healthy.

Etcdadm must be run on the machine that is being added or removed. As a consequence, if a member permanently fails, and the operator cannot invoke `etcdadm reset` on that machine, the operator must use the etcd API to delete the failed member from the list of members.

On its own, etcdadm does not automate cluster operation, but a cluster orchestrator can delegate all the above tasks to etcdadm.

### Sequence Diagrams

See `docs/diagrams` for sequence diagrams of init, join, and reset.

<a name="questions"></a>
## Questions?

For more information reach out to [etcdadm slack channel](https://kubernetes.slack.com/messages/CEM0AT9GW)

etcdadm

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