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etcd-viewer

The etcd-viewer is a java web application that allows you to navigate and modify etcd distributed key-value stores.

The application uses the etcd rest API to communicate with the underlying key-value store.

Getting Started

Run with docker

The easiest way to get etcd-viewer is to run a docker container with the etcd-viewer image:

docker run -d -p 8080:8080 nikfoundas/etcd-viewer

The docker container will deploy the etcd-viewer war file to a jetty servlet container. The docker image is built on top of the jetty:latest image.

Build etcd-viewer

In order to build etcd-viewer you need java-1.8 and maven 3.0.5 or later.

• Clone the etcd-viewer repository

git clone https://github.com/nikfoundas/etcd-viewer.git

• Build the project with maven

mvn clean install

• deploy war file to some servlet container (jetty or tomcat)

• Alternatively you can start the etcd-viewer with maven jetty plugin

mvn jetty:run

• or even build a docker image using the provided Dockerfile

docker build -t some-repo/etcd-viewer .

Embed components within your wicket application

If your application is built with wicket you can also use the components - panels from etcd-viewer to embed the browsing - editing functionality in your application.

Features

Supported etcd API

Etcd viewer supports the following actions via the etcd rest API:

• Get version
• Get node self statistics which contains the leader information
• Retrieve machines that participate in the etcd cluster.
• Create directories and key-value pairs with optionally providing time to live (TTL)
• Retrieve directories and key value nodes
• Update key-value pairs
• Delete directories recursively
• Delete key-value pairs

Multiple etcd key-value stores

You can navigate and modify multiple etcd key-value stores without having to run the application more than once. The etcd clusters are stored in memory and they are forgotten after the application is restarted.

You can add and remove etcd key-value stores at any time. Removing an etcd registry from the etcd-viewer does not affect the contents of the registry itself.

Leader auto detection

In order to add an etcd cluster registry you only need to provide one alive etcd host. The application discovers the rest of the cluster hosts and detects the leader node. All reads and writes are then directed to the leader node to avoid redirections.

Etcd cluster monitor

Etcd viewer enables you to view the machines that participate in the etcd cluster along with their status - leader or follower. If some etcd host is not accessible then it is marked with red to indicate that it is down. Note that for single node etcd registries no status is reported by etcd.

Responsive css

etcd-viewer uses bootstrap css framework to enable key-value storage accessibility even from mobile devices or tablets.

Next steps

• Provide feedback on communication or etcd api errors (partially done)
• Provide log console to record modifications applied
• Extend functionality to view and modify fleet unit information
• Use thread safe CXF jax-rs api (done)
• Support client side basic authentication for etcd with authentication enabled. Check etcd auth api. (etcd 2.1.x and later)
• Support user and role management (etcd 2.1.x and later)
• Provide documentation and hooks to import etcd client certificates

About

etcd-viewer uses the following open source libraries and frameworks:

• Apache wicket 6.19.0: Open source Java web framework
• Apache CXF 3.0.1: To handle the etcd rest API
• FasterXML Jackson 2.5.3: To marshal/unmarshal JSON objects to POJOs
• Google Guice 3.0: For dependency injection
• Bootstrap 3.3.4: Responsive CSS framework
• jQuery 1.11.2: Open source JavaScript library
• FontAwesome 4.3.0: Iconic web font

License

etcd-viewer is released under the Apache 2.0 license. See the LICENSE file for details.