Environment

This guide steps you through configuring a local development environment for the Sentry server on macOS and Linux. If you're using another operating system (Plan 9, BeOS, Windows, …) the instructions are still roughly the same, but we don't maintain any official documentation for anything else for now.

Setup

Begin by installing the devenv tool following these instructions.

After installation you should be able to run devenv bootstrap which will guide you through the rest.

When you're done with setup, you'll want to also review the development workflow.

Keeping your environment up-to-date

Simply run devenv sync inside of your sentry or getsentry repo.

Running the Development Server

sentry devserver --workers

If you are developing for aesthetics only and do not rely on the async workers, you can omit the --workers flag in order to use fewer system resources.

Access it at http://dev.getsentry.net:8000 (you'll have to wait a bit for webpack to finish). A superuser account should have been created for you during bootstrap - admin@sentry.io with password admin. You can create other users with sentry createuser.

Running the Getsentry Development Server

See also: Sentry vs Getsentry

getsentry devserver --workers

Note: You cannot have both sentry and getsentry devserver running at the same time.

After the server warms up for a little while, you must access it at http://dev.getsentry.net:8000. Using localhost doesn't work.

If you need to overwrite configuration options for your local environment, you can create getsentry/conf/settings/devlocal.py and put the configuration option overrides there. This module will be automatically imported by dev.py if it exists.

Frontend Only & Backend Only

Please refer to Frontend Development Server and Backend Development Server for alternative ways to bring up the Sentry UI.

Enabling HTTPS

You may wish to run the development server in HTTPS mode. This can be done by generating and installing local certificates.

We will be using mkcert to create and install a locally-trusted, development certificate. The following will install mkcert and then create and install the local certificates.

brew install mkcert
brew install nss # if you use Firefox
yarn mkcert-localhost

Running sentry devserver will automatically use HTTPS when the certificates have been installed.

Ingestion Pipeline (Relay)

Some services are not run in all situations. Among those are Relay and the ingest workers. If you need a more production-like environment in development, you can set SENTRY_USE_RELAY=True in ~/.sentry/sentry.conf.py. If sentry devservices is currently up ,make sure to restart it after you make the change. This will launch Relay as part of the devserver workflow.

Additionally, you can explicitly control this during devserver usage with the --ingest and --no-ingest flags. The sentry devservices command will not update Relay automatically in that case, to do this manually run:

sentry devservices up --skip-only-if relay
sentry devserver --workers --ingest

If you want to enable the entire metrics ingestion pipeline, you need to add the following to your config at ~/.sentry/sentry.conf.py:

SENTRY_USE_RELAY = True
SENTRY_USE_METRICS_DEV = True
SENTRY_EVENTSTREAM = "sentry.eventstream.kafka.KafkaEventStream"
SENTRY_FEATURES['organizations:metrics-extraction'] = True  # Enables session metrics
SENTRY_FEATURES['organizations:transaction-metrics-extraction'] = True  # Enables transaction metrics

After enabling KafkaEventStream the snuba service has to be reset to pick up the new configuration:

sentry devservices rm snuba
sentry devservices up snuba

Troubleshooting

You might also be interested in troubleshooting CI.

Problem: DoesNotExist: Subscription matching query does not exist during getsentry devserver

Solution:

./bin/mock-subscription

You can also set your local instance's org to use a business plan by running the following in getsentry:

./bin/mock-subscription <org_slug> --plan mm2_a_500k

Problem: You see an error that mentions something like pkg_resources.DistributionNotFound: The 'some_dependency<0.6.0,>=0.5.5' distribution was not found and is required by sentry

Solution: Your virtualenv needs to be updated. Run make install-py-dev.

Problem: You see Error occured while trying to proxy to: dev.getsentry.net:8000/

Solution: You likely need to upgrade your Python dependencies. Go to the git root directory and run make install-py-dev.

Problem: Module not found: Error: Can't resolve 'integration-docs-platforms'

Solution:

make build-platform-assets

Problem: You see SessionNotCreatedException: Message: session not created: This version of ChromeDriver only supports Chrome version 76

Or:

Traceback (most recent call last):
  File "/Users/joshua.li/dev/sentry/sentry/src/sentry/utils/pytest/selenium.py", line 344, in browser
    driver = start_chrome(**chrome_args)
  File "/Users/joshua.li/dev/sentry/sentry/src/sentry/utils/retries.py", line 41, in execute_with_retry
    return retrier(functools.partial(fn, *args, **kwargs))
  File "/Users/joshua.li/dev/sentry/sentry/src/sentry/utils/retries.py", line 85, in __call__
    error,
RetryException: Could not successfully execute <functools.partial object at 0x10f31e7e0> within 15.830 seconds (12 attempts.)

Solution:

ChromeDriver needs to be updated.

brew upgrade --cask chromedriver

Problem:

--- snip ---
00:51:27 server  | ImportError: cannot import name _remove_dead_weakref
00:51:27 server  | unable to load app 0 (mountpoint='') (callable not found or import error)

This is caused by uwsgi running the wrong version of Python. When starting up, you'll see something like

uwsgi socket 0 bound to TCP address 127.0.0.1:8889 fd 3
Python version: 2.7.10 (default, Feb 22 2019, 21:17:52)  [GCC 4.2.1 Compatible Apple LLVM 10.0.1 (clang-1001.0.37.14)]
Set PythonHome to /Users/dfuller/code/sentry/.venv

The Python version here should be 2.7.16, but will be a lower version, likely your system Python. This is because uwsgi was compiled against a stale Python and the resultant wheel has been cached by pip.

Solution:

In your sentry virtualenv:

pip uninstall uwsgi
pip install --no-cache-dir uwsgi

Problem: You see DoesNotExist: Subscription matching query does not exist

Solution: In getsentry, run the following to mock a subscription:

./bin/mock-subscription <org_slug>

Problem: You see something like Error: No such container: sentry_postgres, or you don't see sentry_snuba, sentry_postgres, sentry_clickhouse, and sentry_redis listed under COMMAND NAMES.

Solution:

sentry devservices up

Problem: You see something like Error 61 connecting to 127.0.0.1:6379. Connection refused. when running your dev server.

Solution: Make sure your Docker services are running:

docker ps