Logstash API
What is Port 9600?
Port 9600 is the default monitoring API port for Logstash, the data processing pipeline component of the Elastic Stack. Logstash collects, transforms, and forwards data from diverse sources to destinations like Elasticsearch. The monitoring API on port 9600 provides real-time information about Logstash pipeline performance, JVM metrics, plugin statistics, and node information. Operations teams use this API to monitor Logstash health, detect pipeline bottlenecks, and troubleshoot data processing issues. The API provides endpoints for pipeline stats, OS metrics, JVM heap usage, and hot threads analysis.
Common Uses
- Logstash pipeline monitoring
- ELK Stack health monitoring
- Data pipeline performance analysis
- Logstash node information queries
Technical Details
Copy-paste commands to check port 9600 (Logstash API) from your terminal
Test connectivity
nc -zv example.com 9600
curl -v --max-time 5 http://example.com:9600/
telnet example.com 9600
nmap -p 9600 -sV example.com
(echo > /dev/tcp/example.com/9600) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 9600/tcp
sudo iptables -A INPUT -p tcp --dport 9600 -j ACCEPT
sudo firewall-cmd --permanent --add-port=9600/tcp && sudo firewall-cmd --reload
Security Considerations
Restrict port 9600 access to monitoring systems only. The API exposes internal Logstash configuration details. In newer versions, authentication can be enabled. Don't expose the monitoring API to untrusted networks.
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