I am completely new to docker and i am not a developer. Right now i have an application which runs on centos/nginx/dotnetcore . In dotnet core i have 4 applications, we run them using dotnet appname.dll. or rather systemd. If i want to dockerize this application set, should i create centos as a separate docker image and then nginx as other image and then an image for each of the application ? If yes how do i link them, or should i create only one image with centos/nginx and all 4 applications (which is in tar) installed? Any help on this would be appreciated.
Dockerizing existing application
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2 Answers
Check the dockerfile below about the ASP.NET rest API. It is the same way when you call dotnet appname.dll. Instead of running in Centos it runs in container which is debian based if I'm not wrong
FROM mcr.microsoft.com/dotnet/core/sdk:2.1 AS build-env
WORKDIR /app
COPY MicroService1.csproj MicroService1/
RUN dotnet restore MicroService1/MicroService1.csproj
COPY . .
RUN dotnet publish ./MicroService1.csproj -c Release -o out
FROM mcr.microsoft.com/dotnet/core/aspnet:2.1
WORKDIR /app
RUN ls
COPY --from=build-env /app/out ./
ENTRYPOINT ["dotnet", "MicroService1.dll"]
If you have 4 dependent applications you can use docker-compose.
version: '3.0'
services:
db:
image: mysql:5.7
environment:
MYSQL_RANDOM_ROOT_PASSWORD: 1
MYSQL_DATABASE: accountowner
MYSQL_USER: dbuser
MYSQL_PASSWORD: dbuserpassword
volumes:
- dbdata:/var/lib/mysql
ports:
- "3306:3306"
restart: always
microservice1:
depends_on:
- db
build:
context: ./MicroService1/MicroService1
ports:
- "8080:80"
restart: always
frontend:
depends_on:
- microservice1
build:
context: ./Frontend
ports:
- "4200:4200"
volumes:
dbdata:
Above docker-compose.yml given. It contains 3 service which are frondend, backend and database. In your docker-compose.yml you should define your 4 application
nginx and dotnet as 2 seperate containers for each application would be ideal and recomended
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