dockerfile - CMD mongoimport

Question

FROM mongo

COPY . /data/db2/

# Expose the MongoDB port
EXPOSE 27017
CMD mongoimport --db test --collection data --file /data/db2/data.json

The copy command copy data.json file

when Im trying to put the mongoimport in the CMD directive Im getting this error:

docker logs:

error connecting to host: failed to connect to mongodb://localhost/: server selection error: server selection timeout, current topology: { Type: Single, Servers: [{ Addr: localhost:27017, Type: Unknown, Last error: connection() error occurred during connection handshake: dial tcp 127.0.0.1:27017: connect: connection refused }, ] }

when Im trying to connect to container shell, and run mongosh I get this error:

MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017

the weird part is when Im not putting that CMD Directive, I tried to connect to the container shell and run this command, It worked just fined.

any ideas?

What you want to achieve with CMD? Connect to the container and access db instance? — Richard Rublev, Aug 14 '23 at 07:26
@RichardRublev I want to start a mongodb container that already has a db inside it with the data.json file on startup — aviv levari, Aug 14 '23 at 07:35

0xdnL · Accepted Answer · 2023-08-14T07:49:09.260

When you use CMD mongoimport .. you overwrite the original which is CMD ["mongod"], which would start the database. So your current example never starts the database and can therefore not connect.

If you want to to initialize/restore a database at startup there is a /docker-entrypoint-initdb.d directory in the container image you can use. Checkout Import Data on MongoDB using Docker-Compose or How to create a DB for MongoDB container on start up? for a couple of examples.

dockerfile - CMD mongoimport

1 Answers1