To create a repository in Public DockerHub and push the newly built Nginx image to the repo, follow these steps:
Creating a swarm with EC2 instances and running a Docker Compose file.
1. Sign in to DockerHub (https://hub.docker.com/) or create a new account if you don't have one.
2. Create a new repository:
- Click on the "Create Repository" button on the DockerHub dashboard.
- Choose a repository name (e.g., "my-nginx") and set it to be public.
- Optionally, provide a description and configure other settings as desired.
- Click on the "Create" button to create the repository.
3. Push the Nginx image to the repository:
- In your terminal or command prompt, log in to DockerHub using the following command (replace `your-dockerhub-username` with your actual DockerHub username):
bash
docker login -u your-dockerhub-username
- Provide your DockerHub password when prompted.
- Tag the newly built Nginx image with your DockerHub repository name using the following command:
bash
docker tag my-nginx your-dockerhub-username/my-nginx
- Push the tagged image to DockerHub:
bash
docker push your-dockerhub-username/my-nginx
- Wait for the image to be uploaded to DockerHub.
- Once the push is complete, the newly built Nginx image will be available in your DockerHub repository.
Now that the Nginx image is pushed to DockerHub, you can proceed with creating a swarm with EC2 instances and running a Docker Compose file.
a. Create a Docker Compose file to run Nginx containers with 3 replicas:
- Create a file named "docker-compose.yml" in your project directory.
- Open the file in a text editor and add the following content:
yaml
version: '3'
services:
nginx:
image: your-dockerhub-username/my-nginx
ports:
- 80:80
deploy:
replicas: 3
- Save the file.
b. Run Docker service commands to manage the service:
- Open a terminal or command prompt and navigate to the project directory.
- Initialize a Docker swarm using the following command:
bash
docker swarm init
- Deploy the Docker Compose stack using the following command:
bash
docker stack deploy -c docker-compose.yml my-stack
- View the service logs:
bash
docker service logs my-stack_nginx
- Check the present state of the service:
bash
docker service ps my-stack_nginx
- Scale up or down the number of replicas:
bash
docker service scale my-stack_nginx=5
c. Manually kill containers and observe the service replicas:
- Identify the container IDs of the running Nginx containers using the `docker service ps` command.
- Use the `docker kill` command to manually kill two containers by specifying their container IDs.
- Observe the service replicas using the `docker service ps` command again.
- Docker Swarm will automatically replace the killed containers to maintain the desired number of replicas.
d. Run containers in different network modes:
- Docker provides different network modes for containers, including bridge, host, overlay, and more.
- The network mode determines how containers communicate with each other and with external networks.
- In the Docker Compose file, you can specify the network mode for a service under the `network_mode` key.
- For example, to run the Nginx service in host network mode, update the Docker Compose file as follows:
yaml
version: '3'
services:
nginx:
image: your-dockerhub-username/my-nginx
network_mode: host
- Save the file and redeploy the stack using `docker stack deploy` command.
- By using different network modes, you can control the network behavior of the containers, including their network isolation and connectivity options.
By following these steps, you can create a repository in Public DockerHub, push the Nginx image to the repository, create a swarm with EC2 instances, and run Nginx containers with multiple replicas using a Docker Compose file. You can also explore Docker service commands, observe service logs, scale replicas, and understand different network modes for container networking.
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