Composer Airflow UI now working: airflow-webserver pod in CrashLoopBackOff

[Rahul K Gupta]

Composer Airflow UI is not working. It shows the following error

Error: Server Error
The server encountered a temporary error and could not complete your request.
Please try again in 30 seconds.

On investigation I found error in Kubernetes pod

Composer environment is getting  CrashLoopBackOff on airflow-webserver pod.

Pod log: 


gcs-syncd Sep 3, 2018, 11:49:10 AM Building synchronization state...

airflow-webserver Sep 3, 2018, 11:49:01 AM Found non-zero Airflow scheduler return-code.

airflow-webserver Sep 3, 2018, 11:49:01 AM airflow: error: unrecognized arguments: -n 200

airflow-webserver Sep 3, 2018, 11:49:01 AM ...

airflow-webserver Sep 3, 2018, 11:49:01 AM
{resetdb,render,variables,connections,pause,task_failed_deps,version,trigger_dag,initdb,test,unpause,dag_state,run,list_tasks,backfill,list_dags,kerberos,worker,webserver,flower,scheduler,task_state,pool,serve_logs,clear,upgradedb}

airflow-webserver Sep 3, 2018, 11:49:01 AM usage: airflow [-h]

airflow-webserver Sep 3, 2018, 11:49:01 AM




I deleted all dags from folder to see if there is some issue in dags code 

Reset default airflow configuration using

gcloud composer environments update ENVIRONMENT_NAME --location LOCATION --clear-airflow-configs

 Both methods didn't work. Need help to make airflow UI running. 

[Trevor Edwards]

I assume you are using the self-managed webserver (https://cloud.google.com/composer/docs/how-to/managing/deploy-webserver)? It looks like you may have not switched the "image" field. See step 2 in "Create the web server deployment configuration"