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Arseny Zinchenko
Arseny Zinchenko

Posted on • Originally published at rtfm.co.ua on

Sentry: running self-hosted errors tracking system on an AWS EC2

#aws #monitoring #senrty

Previously we used cloud-based Sentry version but then reached emails limit and our backend-team left without those notifications which are critical for their work.

A self-hosted version was planned a long time ago so now we have a chance to spin it up.

The post below describes how to start self-hosted Sentry on an AWS EC2 instance, configure email and test if from a Python.

Will use Sentry on-premise repository here.

Run AWS EC2, configure SSL from Let’s Encrypt, install NGINX, Docker and Docker Compose.

Those steps are described in details in the Bitwarden: an organization’s password manager self-hosted version installation on an AWS EC2 post, so I’ll skip them here.

Use EC2 type t3.medium as Sentry requires 3 GiB memory as minimal.

Running Sentry

Clone repository:

root@bttrm-sentry:/home/admin# mkdir /opt/sentry
root@bttrm-sentry:/home/admin# cd /opt/sentry/
root@bttrm-sentry:/opt/sentry# git clone https://github.com/getsentry/onpremise.git
root@bttrm-sentry:/opt/sentry# cd onpremise/
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Create Docker Volumes for data and PostgreSQL database:

root@bttrm-sentry:/opt/sentry/onpremise# docker volume create --name=sentry-data && docker volume create --name=sentry-postgres
sentry-data
sentry-postgres
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Create config-file:

root@bttrm-sentry:/opt/sentry/onpremise# cp -n .env.example .env
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Build images:

root@bttrm-sentry:/opt/sentry/onpremise# docker-compose build
smtp uses an image, skipping
memcached uses an image, skipping
redis uses an image, skipping
postgres uses an image, skipping
Building web
Step 1/1 : FROM sentry:9.1-onbuild
9.1-onbuild: Pulling from library/sentry
...
Successfully built 4840fec904c8
Successfully tagged onpremise_worker:latest
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Generate SECRET_KEY:

root@bttrm-sentry:/opt/sentry/onpremise# docker-compose run --rm web config generate-secret-key
Creating network "onpremise_default" with the default driver
Pulling smtp (tianon/exim4:)...
latest: Pulling from tianon/exim4
...
Status: Downloaded newer image for tianon/exim4:latest
Pulling memcached (memcached:1.5-alpine)...
1.5-alpine: Pulling from library/memcached
...
Status: Downloaded newer image for memcached:1.5-alpine
Pulling redis (redis:3.2-alpine)...
3.2-alpine: Pulling from library/redis
...
Status: Downloaded newer image for redis:3.2-alpine
Pulling postgres (postgres:9.5)...
9.5: Pulling from library/postgres
...
Creating onpremise_smtp_1      ... done
Creating onpremise_postgres_1  ... done
Creating onpremise_memcached_1 ... done
Creating onpremise_redis_1     ... done
y0%***1yz
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The last string in the output – с y0%***1yz – is our key.

Edit the .env file and set this SECRET_KEY.

Populate database and create an admin user:

root@bttrm-sentry:/opt/sentry/onpremise# docker-compose run --rm web upgrade
Starting onpremise_redis_1    ... done
Starting onpremise_postgres_1  ... done
Starting onpremise_memcached_1 ... done
Starting onpremise_smtp_1      ... done
12:06:24 [WARNING] sentry.utils.geo: settings.GEOIP_PATH_MMDB not configured.
12:06:27 [INFO] sentry.plugins.github: apps-not-configured
Syncing...
Creating tables ...
Creating table django_admin_log
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table south_migrationhistory
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)
Migrating...
Running migrations for sentry:
- Migrating forwards to 0472_auto__add_field_sentryapp_author.

...
Created internal Sentry project (slug=internal, id=1)

Would you like to create a user account now? [Y/n]: y
Email: admin@example.com
Password:
Repeat for confirmation:
Should this user be a superuser? [y/N]: Y
User created: admin@example.com
Added to organization: sentry
...
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Run the stack:

root@bttrm-sentry:/opt/sentry/onpremise# docker-compose up
onpremise_redis_1 is up-to-date
onpremise_memcached_1 is up-to-date
onpremise_postgres_1 is up-to-date
onpremise_smtp_1 is up-to-date
Creating onpremise_worker_1 ... done
Creating onpremise_web_1    ... done
Creating onpremise_cron_1   ... done
...
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Check containers:

root@bttrm-sentry:/opt/sentry/onpremise# docker ps
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Open a browser and check if Sentry is working:

Log in, here you can configure email but I did it later using AWS SES:

Press Next, check it’s working:

Not sure what’s the worker message here, but it disappeared later.

Now, stop containers and create systemd unit-file – /etc/systemd/system/sentry.service:

root@bttrm-sentry:/opt/sentry/onpremise# systemctl edit --force sentry
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Set here:

[Unit]
Description=Sentry service
Requires=docker.service
After=docker.service

[Service]
Restart=always
WorkingDirectory=/opt/sentry/onpremise
# Compose up
ExecStart=/usr/local/bin/docker-compose -f docker-compose.yml up
# Compose down, remove containers and volumes
ExecStop=/usr/local/bin/docker-compose -f docker-compose.yml down -v

[Install]
WantedBy=multi-user.target
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In case of errors like:

May 18 12:38:33 bttrm-sentry systemd[1]: sentry.service: Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.

Add one more ExecStart, just empty:

[Unit]
Description=Sentry service
Requires=docker.service
After=docker.service

[Service]
Restart=always
WorkingDirectory=/opt/sentry/onpremise
# Compose up
ExecStart=
ExecStart=/usr/local/bin/docker-compose -f docker-compose.yml up
# Compose down, remove containers and volumes

ExecStop=/usr/local/bin/docker-compose -f docker-compose.yml down -v
[Install]
WantedBy=multi-user.target
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Didn’t saw such the error earlier, just googled this solution here>>>.

Run the service:

root@bttrm-sentry:/opt/sentry/onpremise# systemctl start sentry
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Check its status:

root@bttrm-sentry:/opt/sentry/onpremise# systemctl status sentry
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Okay, all good.

Add to autostart:

root@bttrm-sentry:/opt/sentry/onpremise# systemctl enable sentry
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Email

Email configuration documantation is available her>>>.

Edit docker-compose.yml, set variables, here is AWS SES example:

...
    SENTRY_EMAIL_HOST: email-smtp.us-east-1.amazonaws.com
    SENTRY_EMAIL_PORT: 587
    SENTRY_EMAIL_PASSWORD: BH3***gpM
    SENTRY_EMAIL_USER: AKI***OAQ
    SENTRY_EMAIL_USE_TLS: "true"
    SENTRY_SERVER_EMAIL: no-reply@example.com
...
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Pay attention to quotes around the “true”:

SENTRY_EMAIL_USE_TLS: “true”

Save and restart Sentry service:

root@bttrm-sentry:/opt/sentry/onpremise# systemctl restart sentry
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Python Sentry

Create a new project:

Get token:

Check from a workstation – install sentry-sdk:

[setevoy@setevoy-arch-work ~ ] $ sudo pip install sentry-sdk
[setevoy@setevoy-arch-work ~ ] $ python
...
>>> import sentry_sdk
>>> sentry_sdk.init("https://96e***c44@sentry.example.com/2")
<sentry_sdk.hub._InitGuard object at 0x7efd4c487128>
>>> sentry_sdk.capture_message("Hello World")
'736347c534cb4e3eb27fb3e3c0641439'
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Check events in Sentry

And email:

Done.

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