Developing microservices with. NET Core+docker

. NET core has been released for a long time, because in recent years the main use of Java, so has not used. NET core, today there is a C # written demo, need to make a service, do not want to go to Java to implement, consider using. NET core to taste fresh, the goal is to develop a micro-service, It is then deployed to a Docker swarm cluster for other applications to invoke.

Environment preparation

Download the latest version of. NET Core 2.1.3, open command-line validation after installation:

The following output appears, which means the installation is successful.

dotnetUsage: dotnet [options]Usage: dotnet [path-to-application]Options:  -h|--help         Display help.  --info            Display .NET Core information.  --list-sdks       Display the installed SDKs.  --list-runtimes   Display the installed runtimes.path-to-application:  The path to an application .dll file to execute.

Then the VS code installs the C # plug-in,

and installing the NuGet plugin for easy management of extensions.

Create a project

Use the dotnet new name Create project, where name is the project type, as follows:

C:\users\jqpeng>dotnet New--HELP usage: new [options] option:-H,--help displays help on this command. -L,--list lists the template that contains the specified name.  If no name is specified, list all templates. -N,--name is creating the name of the output.  If no name is specified, the name of the current directory is used.  -O,--output the location where the generated output is to be placed.  -I,--install install the source or template package.  -U,--uninstall uninstalls a source or template package.  --NUGET-SOURCE Specifies the NuGet source to use during installation. --type filter templates based on the available types.  The predefined values are "project", "Item", or "other".  --force forces the content to be generated, even if the content changes existing files. -lang,--language filters the template by language and specifies the language of the template to be created. Template short name language tag---------------------------------                               -------------------------------------------------------------------------------------------Console Application console [C #], F #, VB Common/consoleclass Library cl Asslib [C #], F #, VB common/libraryunit Test Project MSTest [C #] , F #, VB Test/mstestnunit3 Test Project NUnit [C #], F #, VB test/nunitnunit 3 test Item              Nunit-test [C #], F #, VB test/nunitxunit test Project Xunit              [C #], F #, VB Test/xunitrazor page page [C #] Web/asp. Netmvc viewimports Viewimports [C #] web/asp. Netmvc Viewstart Viewstart [C #] web/asp. Netasp.net Core Empty Web [C #], F # web/emptyasp.net core Web App (M Odel-view-controller) MVC [C #], F # web/mvcasp.net Core Web App R            Azor [c] Web/mvc/razor pagesasp.net Core with Angular Angular              [C #] Web/mvc/spaasp.net Core with React.js                       react [C #] Web/mvc/spaasp.net Core with React.js and Redux R              Eactredux [C #] Web/mvc/sparazor Class Library razorclasslib [C #] Web/razor/library/razor Class libraryasp.net Core Web API Webapi [C #]  , F # web/webapiglobal.json file Globaljson confignuget                                        Config Nugetconfig configweb config                                  Webconfig configsolution File sln Solutionexamples:dotnet new MVC--auth individual dotnet new Classlib--framework netcoreap p2.1 dotnet New--help

To develop microservices, you can dotnet new mvc create an MVC project, and then the VS code opens.

Engineering implementation

Implementation is simple, step by step coding can, and a few years ago. NET MVC no Essential difference:

Create a new Apicontroller and add a method:

 public JsonResult Search(string tfsid)    {      try      {        return Json(new { success = true, data = PailitaoApi.SearchByTFSId(tfsid) });      }      catch (Exception ex)      {        Console.WriteLine(ex.Message);        return Json(new { success = false, data = "Search failed!" }); ;      }    }

Then delete the default template file, clean up the code in Homecontroler, keep index, reduce the package volume

public string Index()    {      return "api";    }

Main code ok!

Docker Image Compilation

In accordance with the official guidelines, we write dockefile, mainly through the implementation of the microsoft/dotnet:2.1-sdk AS build compilation, through microsoft/dotnet:2.1-aspnetcore-runtime to run, specifically see below, note pailitao.dll need to modify the name of your project:

FROM microsoft/dotnet:2.1-sdk AS buildWORKDIR /app# copy csproj and restore as distinct layersCOPY *.csproj ./RUN dotnet restore# copy everything else and build appCOPY . ./RUN dotnet publish -c Release -o outFROM microsoft/dotnet:2.1-aspnetcore-runtime AS runtimeWORKDIR /appCOPY --from=build /app/out ./EXPOSE 80ENTRYPOINT ["dotnet", "appname.dll"]

Simple analysis:

• Build, first dotnet restore
• Compile release version dll via dotnet publish-c release-o out
• Then build the runtime and copy out the out directory from the build environment
• Then expose 80 port, set entrypoint to ' dotnet Appname.dll '

Micro-Service Cicd

The first is to build, first put the code into SVN, a new free-mode project in Jenkins, build using Build/publish Docker Image:

Then deploy, build the image, and execute the deployment through the shell:

docker service rm  pailitaoservicedocker service create --name pailitaoservice  --replicas 1 --publish 15001:80 192.168.86.8:5000/pailitaoservice

Finally, the test under the service:

Get it done!

Jadepeng
Source: Jqpeng's technical notepad--http://www.cnblogs.com/xiaoqi
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