DevOps / Scripts
bash
Advanced
Blue-Green Deploy Script
Switch traffic between two app instances with zero downtime using Nginx upstream.
bash
#!/bin/bash
ACTIVE=$(cat /etc/nginx/active_slot)
NEXT=$([ "$ACTIVE" = blue ] && echo green || echo blue)
echo Deploying to $NEXT slot
systemctl start app-$NEXT
nginx -s reload
systemctl stop app-$ACTIVE
echo $NEXT > /etc/nginx/active_slotPrerequisites
- Nginx
- Two app instances
Pro Tips
- → Add health check before switching slots.
Commercial Licensing
Acquire a production access token or template license for enterprise deployment.
Module Info
- Language
- bash
- Level
- Advanced
- Read time
- 5 min
- Published
- May 2024
- License
- Commercial License
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