Docker Zookeeper Standalone
ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. In this article, we will explore how to run Zookeeper in a standalone mode using Docker.
Setting Up Zookeeper with Docker
To run Zookeeper using Docker in standalone mode, we need to create a docker-compose.yml file with the following configuration:
```yaml
version: '3'
services:
zookeeper:
image: zookeeper
container_name: zookeeper
ports:
- "2181:2181"
This configuration will create a Zookeeper container and expose port 2181 to interact with it.
To start the Zookeeper container, run the following command in the terminal:
```markdown
```bash
docker-compose up
## Interacting with Zookeeper
Once the Zookeeper container is up and running, we can interact with it using the Zookeeper client. To do this, we need to connect to the Zookeeper container using the following command:
```markdown
```bash
docker exec -it zookeeper zkCli.sh -server localhost:2181
This command will start the Zookeeper client shell and connect to the Zookeeper server running on localhost at port 2181.
## State Diagram
The following is a state diagram representing the lifecycle of a Zookeeper node:
```mermaid
stateDiagram
[*] --> Disconnected
Disconnected --> Connecting: connect
Connecting --> Connected: connected
Connected --> Disconnected: disconnect
Connected --> [*]
Class Diagram
The following is a class diagram representing the components of a Zookeeper node:
classDiagram
class Zookeeper {
- int id
- String data
+ Zookeeper(int id, String data)
+ int getId()
+ String getData()
+ void setData(String data)
}
Conclusion
In this article, we have learned how to run Zookeeper in standalone mode using Docker. We have set up a Docker container for Zookeeper, interacted with it using the Zookeeper client, and visualized the lifecycle of a Zookeeper node using a state diagram. By following these steps, you can easily run Zookeeper in standalone mode for your development and testing purposes.
