When I started to learn about Elasticsearch I had to find an environment to play with. After quick research on the net, I found that the simplest solution is to run Elasticsearch on a docker client.
In this article, we will walk through a simple scenario of running Elasticsearch on docker. Before we dive in, I would like to make a note that this is not an in-depth article on Elasticsearch nor on docker. Both products are well documented and you can find many comprehensive courses on the net for each of these products. This article aims to give you a quick start on working with these two products together.
First thing first
First, you need to have a docker engine.
According to docker official documentation:
Docker Engine is a client-server application with these major components:
- A server which is a type of long-running program called a daemon process (the dockerd command).
- A REST API which specifies interfaces that programs can use to talk to the daemon and instruct it what to do.
- A command line interface (CLI) client (the docker command).
The CLI uses the Docker REST API to control or interact with the Docker daemon through scripting or direct CLI commands. Many other Docker applications use the underlying API and CLI.
The daemon creates and manages Docker objects, such as images, containers, networks, and volumes.
Image source –https://docs.docker.com/engine/docker-overview/
In order to run a Docker Engine you have Two major options:
- Run it on a server in the cloud (AWS, Azure…)
- Run it on your local machine or server (Linux, MacOs, Windows)
Each of these options has his pros and cons, In this article, I choose to concentrate on running the docker on your local machine.
I found this option more simple and intuitive for development purposes. You have full control over your environment and you don’t need internet access. If you choose to run your docker engine in the cloud then beside the Docker installation process, the other steps are the same.
Interacting with your Docker
It doesn’t matter which installation process you choose, You will interact with your Docker through a Docker Client (CLI).
The Docker client (docker) is the primary way that many Docker users interact with Docker. When you use commands such as docker run, the client sends these commands to dockerd, which carries them out. The docker command uses the Docker API. The Docker client can communicate with more than one daemon. – docker official documentation
If you are new to dockers, I encourage you to read this Overview it will give you a basic understanding of the docker concepts.
Create your Elasticsearch container
Latest instructions – check for the latest Elasticsearch version
In order to create your container you first need to obtain the Elasticsearch image.
Run this command on the CLI
docker pull docker.elastic.co/elasticsearch/elasticsearch:7.0.0
This command will go tho the registry and pull the image
A Docker registry stores Docker images. Docker Hub is a public registry that anyone can use, and Docker is configured to look for images on Docker Hub by default. You can even run your own private registry.
An image is a read-only template with instructions for creating a Docker container. Often, an image is based on another image, with some additional customization. For example, you may build an image which is based on the ubuntu image, but installs the Apache web server and your application, as well as the configuration details needed to make your application run.– docker official documentation
Create a network
docker network create somenetwork
Create and run your container:
A container is a runnable instance of an image. You can create, start, stop, move, or delete a container using the Docker API or CLI. You can connect a container to one or more networks, attach storage to it, or even create a new image based on its current state.– docker official documentation
docker run -d --name myelasticsearch --net somenetwork -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.0.0 run on different port: docker run -d --name myelasticsearch --net somenetwork -p 9500:9200 -p 9600:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.0.0
Get a list of all running containers
Get a list of all containers (running\stopped)
docker ps -a
Stop container – stop running container
docker stop myelasticsearch
Start container – you already created the container but it is stopped – restart the container with all its previous changes
docker start myelasticsearch
Access your Elasticsearch container
After your Elasticsearch container is up and running you can access it through the port that you declared in the “docker run” command
Useful Docker commands
You can find the documentation for all commands here
docker images – list of all images in my engine
docker pull “image name” – Pull an image or a repository from a registry
docker run “image name” – create a new container and immediately run it
docker ps -a – list of all containers
docker rm “container id” – delete a container
docker rmi “image id” – delete image
docker network create somenetwork – create a new network
docker network ls – list of all networks
docker inspect network 1ba – inspect specific network
docker start “container id ” – restart an existing container
This was a quick start of running your Elasticsearch client on a docker. From here you can enjoy playing with your local Elasticsearch