CREATE MICROSERVICE WITH .NETCORE

WHAT IS THE SOFTWARE REQUIRED FOR WINDOWS?

ØWindows 10 is required for Docker installation.

ØVisual Studio 2017 has built-in support for Docker, so this is highly recommended.

Ø.NET Core SDK

ØDocker for Windows

ØDocker Tools

Demo

ØCreate a .netcore web API with docker support

ØI got a application with below structure

Ø  Open Application folder from command prompt and check the existing

images using Docker images and running containers using Docker PS.

Image:

Container:

ØAlready I have above images.now I have created new image.

To build the image:

 docker build -t learndokcer .

Finally, I have created an image successfully. my image name is learndocker(here, in the screenshot I mentioned the image name wrongly.)

Again,I check my images

Run the image in a container: 

docker run -d -p 15001:80 --name dc1 learndokcer

docker run -d -p 15002:80 --env ASPNETCORE_ENVIRONMENT-QA --name dc2 learndokcer

Check the docker container

dc1 container

dc2 container

Docker File Explanation:

FROM:

    It tells docker, from which base image you want to base your image from. In our example, we are creating an image from the aspnetcore image. 

RUN :

the command is used to run instructions against the image.

WORKDIR /app:

WORKDIR /app is the working directory of the image; it will store all DLLs inside the app folder.

Copy:

COPY will copy the DLLs of the application to the root directory (here dot represents the root) of the image.

ENTRYPOINT

ENTRYPOINT is responsible to run the main application with the help of ASPNETCOREAPP.dll.

Push and pull the image using docker hub registry

Push image

Ødocker login

Ødocker tag b0887ae04e85 arulpushpam/boardservice:version-1

b0887ae04e85 -image id

Arulpushpam-yourhubusername

Boardservice - image name

version-1 - tage name

Ødocker push arulpushpam/boardservice

Pull image

Ødocker pull arulpushpam/boardservice:version-1

Faced issues

Issue 1:

I got this issue while run the docker image

Reason:

Firewall blocked.we can’t get the nuget source file while doing dotnet restore

Solution:            

Using this docker file for creating an image

Step 1:

Publish the files to this folder bin/Release/netcoreapp2.1/publish

Step 2:

Create a docker file

FROM microsoft/dotnet:2.1-aspnetcore-runtime-nanoserver-1709 AS base

FROM microsoft/dotnet:2.1-sdk-nanoserver-1709  AS build

WORKDIR /app

COPY bin/Release/netcoreapp2.1/publish .

ENTRYPOINT ["dotnet", "/app/BoardService.api.dll"]

Issue 2:

Issue changing the docker file

   While running my application I got a build error and below prompt

Solution:

  It is like a syntax error.when we use any unnecessary lines in the docker file after we got those errors.if we follow the syntax we resolve this.

   

2)while building image 

Issue 3:

Solution

1. Right-click Docker instance

2. Go to Settings

3. Daemon

4. Advanced

5. Set the "experimental": true

6. Restart Docker

Issue 4:

 Solution

move my Dockerfile to the root folder (where exists .sln and .dockerignore files) and my problem was resolved.

Issue 5:

Solution

1. Stop service docker

2. Stop service HNS

3. Delete "C:\ProgramData\Microsoft\Windows\HNS\HNS.data"

4. Delete "C:\ProgramData\docker\network\files\local-kv.db"

5. Start service HNS

6. Start docker

Issue 6:

Solution

In powershell

cd "C:\Program Files\Docker\Docker"

./DockerCli.exe -SwitchDaemon


Sample code

   https://github.com/ArulPushpam/Docker/