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What you are building
A Slack bot has three separate pieces:
- Slack app configuration: the app, event subscriptions, bot scopes, and installation in a workspace.
- Python process: your listeners and business logic, using the official Bolt framework.
- Host operations: a Linux VPS, firewall, secrets file, service supervisor, logs, updates, and recovery procedures.
Most single-workspace bots use two credentials. The xoxb- bot token authorizes Web API calls and is created when the app is installed. The xapp- app-level token authorizes Socket Mode; create it with the connections:write scope. A user token (xoxp-) represents a person and is not a substitute for a bot token.
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Slack’s guidance is explicit: “Treat your tokens like passwords and keep them safe.” Keep credentials out of source control, paste them only into a root-protected environment file, and load them through environment variables.
Prerequisites and a safe target architecture
- A Slack development workspace where you can create and install an app.
- A current Ubuntu Server image or another supported Linux distribution.
- SSH access to the VPS and permission to create a service account and install packages.
- Python 3.7 or newer, as documented by the Bolt for Python project.
- A decision about event delivery: Socket Mode or an HTTPS endpoint.
For a small bot, the target architecture is: Slack workspace → outbound WebSocket from the VPS → Bolt application → systemd service. The process listens on no public port. For HTTP delivery, the architecture becomes Slack → public HTTPS reverse proxy → Bolt’s /slack/events endpoint → application.
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Step 1: Create and install the Slack app
Create the app in a development workspace
- Open Slack’s API app management page and create an app in your development workspace.
- Choose the features your bot actually needs. Start with the smallest set of bot scopes; add a scope only when a feature requires it.
- Install the app to the workspace. The installation produces the bot token that begins with
xoxb-.
Scopes are capability grants, not a checklist to maximize. A message-reply bot may need fewer permissions than one that reads history, uploads files, or manages channels. Removing an unused scope later is safer than discovering that a compromised token had broad access.
Create the app-level token for Socket Mode
- In the app settings, open the app-level token area and create a token.
- Grant
connections:write. - Copy the resulting
xapp-value once and store it in your secret store or root-only environment file.
Enable the Events API and subscribe to only the event types your listeners handle. If you use interactive buttons, menus, or modals, enable the corresponding interactivity features as well. Slack may require you to reinstall the app after changing scopes so the new permissions are reflected in the bot token.
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Use a dedicated directory and virtual environment so the bot’s dependencies do not alter the operating system’s Python installation.
sudo mkdir -p /opt/slackbot
sudo chown "$USER":"$USER" /opt/slackbot
cd /opt/slackbot
python3 -m venv .venv
source .venv/bin/activate
python -m pip install -U pip slack_bolt
The documented minimum is Python 3.7+. Use the newest interpreter supported by your chosen Linux distribution and by the versions you intend to deploy. Record the resolved packages after installation:
python -m pip freeze > requirements.txt
The Python Slack SDK is downloaded about 8.6 million times per month and Bolt for Python about 1.5 million times per month, according to Slack’s April 14, 2026 Python development article. Those are download figures, not a guarantee of performance or uptime.
Step 3: Write a minimal Socket Mode bot
Create /opt/slackbot/app.py:
import os
from slack_bolt import App
from slack_bolt.adapter.socket_mode import SocketModeHandler
app = App(token=os.environ["SLACK_BOT_TOKEN"])
@app.message("hello")
def message_hello(message, say):
say(f"Hey there <@{message['user']}>!")
if __name__ == "__main__":
SocketModeHandler(app, os.environ["SLACK_APP_TOKEN"]).start()
The @app.message decorator registers a listener for matching message text. Other listeners use decorators such as @app.event. Bolt parses Slack payloads, dispatches them to your functions, and exposes helpers such as say for replies.
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Before deploying, run it interactively with temporary environment variables:
export SLACK_BOT_TOKEN='xoxb-your-token'
export SLACK_APP_TOKEN='xapp-your-token'
/opt/slackbot/.venv/bin/python /opt/slackbot/app.py
Invite the bot to a test channel and send a message containing “hello”. Stop it with Ctrl+C after confirming the reply. Never put real token values in app.py, shell history, screenshots, issue tickets, or a public repository.
Socket Mode or HTTP: choose the delivery model
Socket Mode is the practical default for a small VPS that does not already run a public web service. Slack supplies and refreshes a WebSocket URL at runtime; your server makes the outbound connection. HTTP mode is a better fit when you already operate a public HTTPS service, require a stable Request URL, or are building a broadly distributed application.
| Decision point | Socket Mode | HTTP endpoint |
|---|---|---|
| Inbound exposure | No public application listener is required; the VPS initiates the connection. | Slack must reach a public HTTPS endpoint. |
| Domain and TLS | No domain or certificate is needed for the bot connection. | Use a domain, certificate, and reverse proxy in front of Bolt. |
| Firewall and corporate networks | Usually simpler because outbound HTTPS/WebSocket traffic is allowed in many networks. | Requires an inbound HTTPS rule and correctly routed DNS. |
| Application configuration | Start SocketModeHandler with the app-level token. |
Configure Slack’s Request URL, commonly /slack/events, and give Bolt the signing secret. |
| Scaling and load balancing | Each running connection is a live WebSocket; plan connection ownership before running replicas. | Stateless HTTP workers can sit behind a load balancer, provided signing verification and event handling are consistent. |
| Marketplace distribution | Slack’s legacy Socket Mode documentation says Socket Mode apps are not currently allowed in the public Marketplace; verify the current policy before depending on that restriction. | HTTP is the conventional choice for a broadly distributed or Marketplace-oriented app. |
Do not expose a random port just because a tutorial does. In Socket Mode, keeping the bot process unbound to a public interface reduces attack surface. In HTTP mode, expose only the reverse proxy’s HTTPS port and keep the Python process on a local socket or loopback address.
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Step 4: Provision and harden the Linux VPS
Create a least-privilege account
Use a separate account for deployment and another dedicated account for the running service. The service account should own only the files it must read and should not have administrative privileges.
sudo adduser --system --group --home /opt/slackbot slackbot
sudo chown -R slackbot:slackbot /opt/slackbot
Use SSH keys rather than password-only access, disable or restrict direct root SSH login according to your provider’s recovery process, and grant administrative rights only to the account used for setup and maintenance. Ubuntu’s security guidance emphasizes least privilege, SSH, a firewall, and automatic security updates.
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Apply firewall rules carefully
Ubuntu identifies ufw as its default firewall frontend. Confirm your actual SSH port and source restrictions before enabling it:
sudo ufw allow OpenSSH
sudo ufw enable
sudo ufw status verbose
If SSH uses a nonstandard port, replace OpenSSH with the matching rule before running ufw enable. Locking yourself out is avoidable: keep an existing SSH session open while testing a second connection. For Socket Mode, allow SSH and outbound HTTPS/WebSocket traffic and do not open an inbound bot port. For HTTP mode, allow only the HTTPS port used by the reverse proxy. Configure the VPS provider’s security group and the host firewall consistently; a permissive cloud rule can undo a restrictive host rule.
Keep the operating system patched
Ubuntu normally installs unattended-upgrades and runs it daily through systemd timers. Review its logs, reboot policy, and whether package updates restart services. Schedule maintenance for updates that can replace Python, OpenSSL, or other runtime components, and test that the bot returns after a reboot.
Step 5: Store secrets outside the project
Create a root-owned environment file:
sudo install -d -m 0750 -o root -g slackbot /etc/slackbot
sudo install -m 0600 -o root -g slackbot /dev/null /etc/slackbot/slackbot.env
sudoedit /etc/slackbot/slackbot.env
Put only environment assignments in that file:
SLACK_BOT_TOKEN=xoxb-replace-this-value
SLACK_APP_TOKEN=xapp-replace-this-value
Because the service runs as slackbot, the group permission must let that account read the file while keeping all other users out. Verify the mode and ownership, and ensure the file is excluded from backups that are not encrypted. If a token is exposed, revoke or rotate it in Slack immediately, update the file, and restart the service.
Step 6: Run it continuously with systemd
SSH sessions are not process supervisors. Closing a terminal, losing a network connection, or rebooting the VPS should not stop the bot. Create /etc/systemd/system/slackbot.service:
[Unit]
Description=Slackbot
After=network-online.target
Wants=network-online.target
[Service]
Type=simple
User=slackbot
WorkingDirectory=/opt/slackbot
EnvironmentFile=/etc/slackbot/slackbot.env
ExecStart=/opt/slackbot/.venv/bin/python /opt/slackbot/app.py
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
Load, enable, and inspect it:
sudo systemctl daemon-reload
sudo systemctl enable --now slackbot
sudo systemctl status slackbot
sudo journalctl -u slackbot -f
Restart=on-failure handles crashes, while RestartSec=5 prevents an immediate tight restart loop. A clean stop remains intentional. If you change the unit, run daemon-reload; if you change only the environment file, restart the service:
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sudo systemctl restart slackbot
Systemd is Ubuntu’s native configuration for long-running processes. The journal gives you a first diagnostic source without writing tokens or ad-hoc log files into the application directory.
Step 7: Configure the HTTP branch when Socket Mode is not suitable
HTTP mode requires Slack to reach a configured Request URL. Set the URL to the Bolt endpoint, commonly /slack/events, and provide the app’s signing secret to Bolt so incoming requests can be verified. Place a reverse proxy in front of the Python application, terminate TLS there, and bind Bolt to loopback or a private socket rather than a public interface.
Your deployment then needs DNS, a valid certificate, an inbound HTTPS firewall rule, proxy timeouts compatible with Slack requests, and a health and log strategy for both proxy and application. Keep the endpoint fast: acknowledge Slack’s request before doing slow work, then queue or perform the longer operation separately. Slack can retry Events API deliveries when requests fail, so handlers must tolerate duplicates.
HTTP mode does not eliminate token hygiene. Keep the bot token, signing secret, and any app-level token in the same protected configuration system, and rotate each credential independently when required.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Design listeners for retries and restarts
Acknowledge quickly
Slack expects prompt acknowledgement. A listener that waits on a slow database query, external API, or file operation before responding is more likely to trigger a retry. Return an acknowledgement first, then process slow work in a queue or background worker where the feature requires it.
Make work idempotent
Retries and process restarts can deliver the same logical event more than once. Use Slack’s event or request identifiers, your own durable job key, or a database constraint to ensure that a repeated delivery does not duplicate a payment, ticket, message, or other side effect.
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Log useful context without secrets
Log event type, request or event ID, execution time, and outcome. Redact tokens, signing secrets, authorization headers, and sensitive message content. Alert on repeated restarts rather than treating every single restart as an outage.
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- Keep source code,
requirements.txt(or a lock file), the environment-file template, and deployment notes in a private repository or encrypted backup. Never commit the real environment file. - Review dependency changes before installing them. Upgrade the virtual environment rather than system packages used by other applications.
- Run a syntax or smoke test with the service stopped or in a staging directory.
- Install the new code, restart with
sudo systemctl restart slackbot, and watchsudo journalctl -u slackbot -f. - Keep the previous release and dependency set available so you can roll back if startup, authentication, or event handling fails.
Test the rollback procedure whenever you upgrade Python, Bolt, or the operating system. A backup that has never been restored is only an assumption.
Troubleshooting by symptom
The process exits immediately
Run sudo systemctl status slackbot and inspect sudo journalctl -u slackbot -n 100 --no-pager. Common causes are a wrong ExecStart path, a missing virtual environment, a syntax error, or an environment file that systemd cannot read. Confirm that /opt/slackbot/.venv/bin/python exists and that the service account can read the application and environment file.
Socket Mode never connects
Check that the app-level token is an xapp- token with connections:write, that the bot token belongs to the intended workspace, and that outbound HTTPS/WebSocket traffic is permitted by both the cloud security group and the host firewall. Do not add an inbound listener merely to make Socket Mode work.
Slack shows an authorization or scope error
Compare the listener’s required capability with the app’s bot scopes. After changing scopes, reinstall the app if Slack requests it, then replace the bot token in the environment file and restart the service.
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HTTP requests fail verification
Verify the signing secret, the exact Request URL, proxy forwarding, system clock, and TLS certificate. Ensure that the reverse proxy forwards the request body without modification that would break signature verification. Keep the application endpoint private behind the proxy.
The bot replies twice
Look for Slack retries and for duplicate processing in your own code. Record event IDs, acknowledge promptly, and make the side effect idempotent before adding more aggressive retry settings.
The bot stopped after a reboot or update
Check that the unit is enabled with systemctl is-enabled slackbot, inspect the journal around boot, and confirm that the environment file and virtual environment still exist. Review automatic-update logs and your reboot policy; a package update may have restarted the process while leaving a configuration or dependency problem behind.
Production readiness checklist
- Only required Slack bot scopes are granted.
xoxb-andxapp-tokens are outside source control and readable only by the service.- The bot runs as a dedicated non-root account.
- SSH access is tested through the firewall before
ufwis enabled. - Socket Mode has no unnecessary inbound application port; HTTP mode exposes only HTTPS through a reverse proxy.
- The service is enabled in systemd and restarts after a failure.
- Logs are useful, redacted, retained, and monitored for restart loops.
- Listeners acknowledge quickly and handle duplicate deliveries safely.
- Operating-system security updates, reboot behavior, and maintenance windows are understood.
- Source, dependency metadata, configuration templates, and persistent state are backed up, and a rollback has been rehearsed.
Bottom line
For a single-workspace Slackbot on a Linux VPS, use Bolt for Python in a virtual environment, keep credentials in a root-protected environment file, choose Socket Mode unless you genuinely need a public HTTP service, and run the process under systemd as a dedicated user. Add HTTPS, a reverse proxy, signing-secret verification, and stricter inbound firewall rules only for the HTTP architecture. Treat retries, token rotation, updates, logs, backups, and rollback as part of the build rather than tasks to postpone after the first successful reply.
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