DevOps & Dockerization

After Solution generation, docker-compose.yml is created in your parent folder to run the Redis, Kafka, Zookeeper, ELK, Generated Microservices, Genesis admin API, Identity Server and UI on Docker instances.

docker-compose.yml

version: '3.4'

services:

    kafka:
    image: johnnypark/kafka-zookeeper
    ports:
        - "2181:2181"
        - "9092:9092"
    network_mode: bridge
    environment:
    ADVERTISED_HOST: 127.0.0.1
    NUM_PARTITIONS: 1
    volumes:
        - /var/run/docker.sock:/var/run/docker.sock

    redis:
        image: redis:alpine
        command: ["redis-server","--appendonly", "yes"]
        #container_name: redis
        hostname: redis
        ports:
            - "6379:6379"
        network_mode: bridge
        volumes:
            - redis-data:/data

    ui-project:
        #container_name: ui-project
        build:
            context: .
            dockerfile: UI/Dockerfile
        network_mode: bridge
        volumes:
            - './UI/:/usr/src/app'
            - '/usr/src/app/node_modules'
        depends_on:
            - redis
            - kafka
            - adminsvc
            - identitysrv

    identitysrv:
        image: ${DOCKER_REGISTRY-}identitysrv
        build:
            context: .
            dockerfile: IdentityServer/Dockerfile
        network_mode: bridge
        depends_on:
            - kafka

    adminsvc:
        image: ${DOCKER_REGISTRY-}adminsvc
        build:
            context: .
            dockerfile: Admin/Admin.Svc/Dockerfile
        network_mode: bridge
        depends_on:
            - kafka

    microservice.api:
        image: ${DOCKER_REGISTRY-}microservice
        build:
            context: .
            dockerfile: Microservice/Microservice.API/Dockerfile
        network_mode: bridge
        depends_on:
            - kafka

    elk:
        image: sebp/elk
        ports:
            - "5601:5601"
            - "9200:9200"
            - "5044:5044"
        network_mode: bridge
        volumes:
            - ./logstash.conf:/etc/logstash/conf.d/02-beats-input.conf
            - elk-data:/var/lib/elasticsearch
            
volumes:
    redis-data:
    elk-data:

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Run your microservices on Docker containers

One of the software patterns containers make easier is microservices, where applications are constituted from many loosely coupled components. By decomposing traditional, “monolithic” applications into separate services, microservices allow the different parts of a line-of-business app to be scaled, modified, and serviced separately—by separate teams and on separate timelines, if that suits the needs of the business.

Containers aren’t required to implement microservices, but they are perfectly suited to the microservices approach and to agile development processes generally.

If you use Docker to create services which have varying demand (such as websites or APIs), it’s incredibly easy to scale your provisioning by simply firing up more Docker containers.

There are a number of frameworks for orchestrating container clusters, such as Kubernetes, Docker Swarm, Nomad and for monitoring such as Prometheus and Grafana

Add Docker metadata

To run with Docker Image you need a Dockerfile — a text file that contains instructions for how to build your app as a Docker image. A docker image contains everything needed to run your app as a Docker container. Return to app directory Since you opened a new terminal in the previous step, you'll need to return to the directory you created your service in.

cd myMicroservice

Add a DockerFile

Create a file called Dockerfile with the following content in a text editor:

Dockerfile

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /src
COPY myMicroservice.csproj .
RUN dotnet restore
COPY . .
RUN dotnet publish -c release -o /app

FROM mcr.microsoft.com/dotnet/aspnet:5.0
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["dotnet", "myMicroservice.dll"]

Note: Make sure to name the file as Dockerfile and not Dockerfile.txt or some other name.

Optional: Add a .dockerignore file

A .dockerignore file reduces the set of files that are used as part of docker build. Fewer files will result in faster builds.

Create a file called .dockerignore file (this is similar to a .gitignore file if you're familiar with those) with the following content in a text editor:

.dockerignore

Dockerfile
[b|B]in
[O|o]bj

Create Docker image

Run the following command:

docker build -t mymicroservice .

The docker build command uses the Dockerfile to build a Docker image.

• The -t mymicroservice parameter tells it to tag (or name) the image as mymicroservice.
• The final parameter tells it which directory to use to find the Dockerfile (. specifies the current directory).

You can run the following command to see a list of all images available on your machine, including the one you just created.

docker images

Run Docker image

You can run your app in a container using the following command :

docker run -it --rm -p 5555:80 --name mymicroservicecontainer mymicroservice

Optionally, you can view your container running in a separate terminal window using the following command:

docker ps

You can browse to the following URL to access your application running in a container: http://localhost:5555

Congratulations! You've successfully created an independent service that can be deployed and scaled using Docker containers.

Check for instructions of Microsoft about microservice dockerization https://dotnet.microsoft.com/learn/aspnet/microservice-tutorial/docker-file