How to run dynamodb-local in Docker without -inMemory flag

Question

According to docs there are 2 flags that affects run of dynamodb-local

-inMemory -> makes all data to persist in RAM only, when service is terminated - all data gets deleted

-sharedDB -> makes all logins to be written to the same shared file

no switces -> each credentials login persists data in different file - this is the default behavior

However, if you look in docker.hub you'll see that the default behavior when running dynamodb-local in docker is with the -inMemory flag. but I don't want it, I want the real default behavior. How can I override it?

Answer 1

Well, it was very hard to find it, but it's a very simple solution.

According to this great post, we can easily override the [CMD] part of the docker pulled image.

We just need to add the args after docker run. This is the command that I used:

docker run -p 8000:8000 --name local-dynamodb amazon/dynamodb-local -jar DynamoDBLocal.jar

-p is for defining the port to expose, so your app can contact dynamodb-local on port 8000

--name is for giving a readable name to the image

everything after amazon/dynamodb-local is the overriding part, the predefined entrypoint is JAVA, so we just need to add the -jar switch, specify the file name to run, and omit that evil -inMemory switch

It’s an option to add a flag -sharedDb to make all credentials to connect to the same DB, otherwise - the default is different file for each set of credentials (including region!)

Good luck all! and Happy coding