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RavenDB, Docker and F#


Here is a little F# application which connects to a RaveDB database, adds an entry and reads them. I used this application to play with RavenDB running inside a Docker container.

open Raven.Client.Documents

type Customer = {
    FirstName: string
    LastName: string
}

[<EntryPoint>]
let main argv =
    printfn "Hello RaveDB!"

    use store = new DocumentStore ()
    store.Urls <-  [|"http://10.0.75.1:8080"|]
    store.Database <- "RavenDB1"
    use store = store.Initialize ()
    
    use session = store.OpenSession ()
    let customer1 = { FirstName = "Guy"; LastName = "Montag" }
    session.Store customer1
    session.SaveChanges ()

    let customers = query {
        for customer in session.Query<Customer>() do
        select customer
    }

    customers |> Seq.iter (printf "%A")

    printfn "Done!"
    0

You can download the full project from my GitHub repository.

https://github.com/chuchu/sandbox/tree/master/ravendb/raven1

From the code you can see that the database runs on 10.0.75.1 which is the IP address of my Docker bridge.

To execute a RavenDB Docker container you need to download the image first. You can do this by executing the command:

docker pull ravendb/ravendb

This will download the latest ubuntu based version. To run the image its best to use the run-ubuntu1604.ps1 powershell script which is provided by the RavenDB project.

ubuntu1604.ps1 -AuthenticationDisabled -PublicServerUrl "http://10.0.75.1:8080"

Disabling authentication is good for testing purposes. So there is no need to deal with certificates. Why it is necessary to provide the PublicServerUrl is something what I don’t really understand completely. But this article explains it a little bit.

https://ayende.com/blog/178819/bug-stories-how-do-i-call-myself

Now you can open your browser, go to http://10.0.75.1:8080 and create the database RavenDB1. When the database is up and running the application can be executed.

dotnet run

When everything works as expected the F# application can be deployed in a container too. Before the image can be created you need to make a release build.

dotnet publish -c release -o app

The docker file is available in the repository. So you just need to type

docker build -t hello-ravendb .

Have a look for the line

Successfully built 388344c214f3

Your ID is surely different, but you need it to run your image.

docker run 388344c214f3

You should see the same output as when the application was executed directly.

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Kategorien:.NET, Uncategorized
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