Error: Could not start Database Emulator, port taken.

See original GitHub issue

First question: I can not setup new Emulators port and project. I can not open other staff like real time database. That means the “firebase emulators:start” command not work for me.

i  emulators: Starting emulators: auth, functions, firestore, database, hosting, pubsub
!  functions: The functions emulator is configured but there is no functions source directory. Have you run firebase init functions?
!  firestore: Did not find a Cloud Firestore rules file specified in a firebase.json config file.
!  firestore: The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
i  firestore: Firestore Emulator logging to firestore-debug.log
i  emulators: Shutting down emulators.
i  firestore: Stopping Firestore Emulator
!  Firestore Emulator has exited upon receiving signal: SIGINT
i  hub: Stopping emulator hub
!  database: Port 9000 is not open on localhost, could not start Database Emulator.
!  database: To select a different host/port, specify that host/port in a firebase.json config file:
      {
        // ...
        "emulators": {
          "database": {
            "host": "HOST",
            "port": "PORT"
          }
        }
      }
i  emulators: Shutting down emulators.

Error: Could not start Database Emulator, port taken.

Second question: I can not setup new emulator. What should I do? I always get following results for command “firebase init”

=== Emulators Setup
? Which Firebase emulators do you want to set up? Press Space to select emulators, then Enter to confirm your choices. (Press <space> to select, <a> to toggle all, <i> to i
nvert selection)Authentication Emulator, Functions Emulator, Firestore Emulator, Database Emulator, Hosting Emulator, Pub/Sub Emulator
i  Port for auth already configured: 9099
i  Port for functions already configured: 5001
i  Port for firestore already configured: 8080
i  Port for database already configured: 9000
i  Port for hosting already configured: 5000
i  Port for pubsub already configured: 8085
i  Emulator UI already enabled with port: (automatic)
? Would you like to download the emulators now? No

Issue Analytics

State:
Created 3 years ago
Reactions:4
Comments:11 (3 by maintainers)

Top GitHub Comments

40reactions

nico75005commented, Nov 29, 2020

Assuming you use a shell like bash for example, just do

lsof -ti tcp:9000 | xargs kill -9

You port might be used due to a previous stop of the emulator in a wrong way.

7reactions

MalikOwais123commented, Mar 29, 2021

I use https://www.npmjs.com/package/kill-port before starting the emulator ; works like a charm

Thanks…

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