airflow webserver started but UI doesn't show in browser

Question

I'm trying to use airflow .

I want to take a local test of the dags I wrote. I'm on windows so I decided to install ubuntu WLS following this bief tutorial https://coding-stream-of-consciousness.com/2018/11/06/apache-airflow-windows-10-install-ubuntu/. Everything seems fine.

I started my db with airflow initdb.

Then I run airflow webserver -p 8080 and it seems running. When I go to http://0.0.0.0:8080/ I can't see any user interface. If I try to run again the airflow webserver I got

Error: Already running on PID 6244 (or pid file '/home/marcofumagalli/airflow/airflow-webserver.pid' is stale)

so i suppose that webserver is running.

Is it something related to proxy?

Answer 1

Error: Already running on PID 6244 (or pid file '/home/marcofumagalli/airflow/airflow-webserver.pid' is stale)

This means that the port 8080 is busy.

Try running the commands below:-

1. sudo lsof -i tcp:8080:- will show are the processes running as

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME Python 945 amanraheja 6u IPv4 0xb7fcab59337d7455 0t0 TCP *:http-alt (LISTEN) Python 1009 amanraheja 6u IPv4 0xb7fcab59337d7455 0t0 TCP *:http-alt (LISTEN) Python 1052 amanraheja 6u IPv4 0xb7fcab59337d7455 0t0 TCP *:http-alt (LISTEN) Python 1076 amanraheja 6u IPv4 0xb7fcab59337d7455 0t0 TCP *:http-alt (LISTEN) Python 96034 amanraheja 6u IPv4 0xb7fcab59337d7455 0t0 TCP *:http-alt (LISTEN)

2. Kill the PID's by kill -9 945 and so on..

3. delete the airflow-webserver.pid file and start the server again and you will see that it is running fine.

Answer 2

mac docker memory issue

I hit this error while developing in my mac, and looking at the logs I found an exited with code: 137, which is an OOM code (although perhaps not always).

In any case, I fixed it by increasing the memory limit to 3GB in docker, following these docs:

Answer 3

hey actually same thing happened with me. i am sharing following steps which i did. kill the running pid by using kill pid command. then confirm that you have initiated db with airflow db init command. and created user by using airflow users create command. after doing this step by step. use localhost:8080 in place 0.0.0.0:8080. it worked for me.