If the start script does not complete successfully, please go through the following troubleshooting steps.
Upon startup, if the output is similar to below, it is possible that the environment is not supported or
cp-demowas not started properly. Please read the pre-requisites and follow proper instructions at Module 1.
WARNING: The REPOSITORY variable is not set. Defaulting to a blank string. WARNING: The SSL_CIPHER_SUITES variable is not set. Defaulting to a blank string. WARNING: The CONNECTOR_VERSION variable is not set. Defaulting to a blank string. WARNING: The CONTROL_CENTER_KSQL_WIKIPEDIA_URL variable is not set. Defaulting to a blank string. WARNING: The CONTROL_CENTER_KSQL_WIKIPEDIA_ADVERTISED_URL variable is not set. Defaulting to a blank string. Pulling zookeeper (/cp-zookeeper:6.1.0)... ERROR: invalid reference format
Verify that the status of all the Docker containers show
In the advanced Docker preferences settings, verify the following resources are allocated to Docker:
- Memory: at least 8 GB (default is 2 GB)
- CPU cores: at least 2 cores
Verify you have not run out of disk storage needed for Docker’s “disk image” file (Docker documentation).
If the script errors out before completing, or if there are Docker containers that are not in
Upstate, view the container’s logs with the command
docker-compose logs [container]and look for error messages and exceptions.
If there are any errors that indicate issues with TLS communication, verify that the TLS certificates were properly generated and that there are no errors in the following files:
If there are any errors that indicate issues with TLS communication, force TLS certificates to be regenerated by starting the script with
If a command that communicates with ZooKeeper appears to be failing with the error
org.apache.zookeeper.KeeperException$NoAuthException, change the container you are running the command from to be either
kafka2. This is because ZooKeeper is configured for SASL/DIGEST-MD5, and any commands that communicate with ZooKeeper need properties set for ZooKeeper authentication.
Verify there are messages in the Kafka topics, including
Run the validation scripts to verify that they pass.
If you are running
cp-demofor a long time and issuing Confluent CLI commands on the
toolscontainer that error out with:
Your token has expired. You are now logged out. Error: You must log in to run that command.
Then run the following command, which refreshes the token by logging back in to MDS: