Productivitydocker-ready1-click-deploypermissive-license
Mattermost: the best Open Source alternative to Slack in 2026
Mattermost is a secure collaboration platform widely used by DevOps and government teams, with deep integrations into CI/CD pipelines and incident response.
Technical profile
- License
- MIT
- Category
- Productivity
- Replaces
- Slack, Microsoft Teams
- Tech stack
- GoReactPostgreSQL
Preview
Public image provided by Mattermost on its own website.
Key features
- Playbooks for incident management
- Native CI/CD integrations
- Configurable compliance and retention
Mattermost vs. Slack
Pros
- Widely used in regulated and government environments
Things to consider
- The Team edition has fewer features than Enterprise
Quick Docker installation guide
Copy this docker-compose.yml, adjust the example passwords and run docker compose up -d on your server. See the full step-by-step guide →
docker-compose.yml
version: "3.9"
services:
mattermost:
image: mattermost/mattermost-team-edition:latest
restart: unless-stopped
ports:
- "8065:8065"
environment:
- MM_SQLSETTINGS_DATASOURCE=postgres://mattermost:mattermost@mattermost-db:5432/mattermost?sslmode=disable
volumes:
- mattermost_data:/mattermost/data
depends_on:
- mattermost-db
mattermost-db:
image: postgres:15-alpine
restart: unless-stopped
environment:
- POSTGRES_USER=mattermost
- POSTGRES_PASSWORD=mattermost
- POSTGRES_DB=mattermost
volumes:
- mattermost_pg_data:/var/lib/postgresql/data
volumes:
mattermost_data:
mattermost_pg_data: