Unable to install kafka-connect-datagen:0.1.0

After running docker-compose up -d in examples/cp-all-in-one i get the following error:

$ docker-compose up -d
Building connect
Downloading context: https://github.com/confluentinc/kafka-connect-datagen/raw/master/Dockerfile-confluenthub     778B
Step 1/3 : FROM confluentinc/cp-kafka-connect:5.0.0
 ---> 7df8759460f7
Step 2/3 : ENV CONNECT_PLUGIN_PATH="/usr/share/java,/usr/share/confluent-hub-components"
 ---> Using cache
 ---> 54861200b09e
Step 3/3 : RUN  confluent-hub install --no-prompt confluentinc/kafka-connect-datagen:0.1.0
 ---> Running in e32e29b5eae7
Running in a "--no-prompt" mode 
java.net.UnknownHostException: api.hub.confluent.io 
 
Error: Unknown error 
ERROR: Service 'connect' failed to build: The command '/bin/sh -c confluent-hub install --no-prompt confluentinc/kafka-connect-datagen:0.1.0' returned a non-zero code: 7

I was able to avoid this error after i set connect back to image: confluentinc/cp-kafka-connect:5.0.0 .

[ybyzek]

If you’re willing, here is one more suggestion to try: instead of building the connector image locally, run the CP connect image and then manually install the connector.

1. Remove these lines at: https://github.com/confluentinc/cp-docker-images/blob/5.1.0-post/examples/cp-all-in-one/docker-compose.yml#L51-L54

    image: confluentinc/kafka-connect-datagen:0.1.0
    build:
      context: https://github.com/confluentinc/kafka-connect-datagen/raw/master/Dockerfile-confluenthub
      dockerfile: Dockerfile-confluenthub

and replace it with the following line

    image: confluentinc/cp-kafka-connect:5.0.0

1. Bring up the environment: docker-compose up -d

2. Run the install command from within the connect container: docker-compose exec connect confluent-hub install --no-prompt confluentinc/kafka-connect-datagen:0.1.0

[sadehart]

So a weird series of events just happened. As suggested, I manually downloaded the zip file into my downloads folder using https://www.confluent.io/connector/kafka-connect-datagen/#download. I then made a new folder in confluent-5.2.1/share called “confluent-hub-components”. Then, just for fun I tried rerunning confluent-hub install confluentinc/kafka-connect-datagen:0.1.2 and it worked fine. After that ran successfully, docker-compose up -d --build ran without error.

I dunno if it’s an issue with the folder not being there or if by manually downloading the thing I generated a valid certificate for the CLI to piggyback off of, but hopefully this provides some helpful info for resolvers (or at least a viable workaround).