In today’s world of distributed systems, containerization has become a popular choice for deploying and managing applications. Docker Swarm, a native clustering and orchestration solution for Docker, allows you to create a swarm of Docker nodes that work together as a cluster. In this blog post, we will explore the steps to deploy a service to a Docker Swarm cluster and take advantage of its powerful features for managing containerized applications.
Deploying Services to a Docker Swarm Cluster
The simple, I will deploy the NGINX container service.
Log into Controller. Run the following command.
docker service create --name nginx_test nginx
To check the service status as command below
vagrant@controller:~$ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
44sp9ig3k65o nginx_test replicated 1/1 nginx:latest
We will deploy that service to all three nodes as commanded below
docker service create --replicas 3 --name nginx3nodes nginx
The result is Deploy service to the swarm as the picture below
You want to scale the service to all five nodes.
docker service scale nginx3nodes=5
We deploy Portainer on the controller to easily manage the swarm.
docker run -d -p 8000:8000 -p 9443:9443 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce
Open the browser, and go to http://SERVER:9443 (Where SERVER is the IP address of the server). you should see Swarm listed in the left navigation
Swarm on portainer
You have to Deploy the service to the swarm. Docker Swarm will take care of scheduling the service across the Swarm nodes and managing its lifecycle.
Docker Swarm simplifies the management and scaling of containerized applications, providing fault tolerance and high availability. By following the steps outlined in this blog post, you can easily deploy your services to a Docker Swarm cluster and take advantage of its powerful orchestration capabilities.
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