The error message “failure to get a peer from the ring balancer” in Kong Ingress indicates that the load balancer couldn’t connect to any of the upstream targets. This issue is significant because it can lead to service disruptions, causing requests to fail and potentially returning HTTP 503 errors. Understanding and resolving this error is crucial for maintaining the reliability and availability of services managed by Kong Ingress.
The error message “failure to get a peer from the ring balancer using Kong Ingress” can be caused by several factors:
No Targets Configured: The upstream entity has no targets. This can be checked using the Admin API /upstreams
endpoint.
Unhealthy Targets: Targets exist but are not healthy. This can result from network or DNS issues, backend problems, etc. Use the Admin API /health
endpoint to review target health.
Unhealthy Balancer: The balancer itself is unhealthy. This can be confirmed by including the balancer_health=1
query parameter in the /health
endpoint.
Version-Specific Bugs: Certain versions of Kong may have bugs causing this issue. Upgrading to a newer version might resolve the problem.
Configuration Issues: Misconfigurations in the Kong Ingress Controller or the upstream services can lead to this error. Ensure all configurations are correct and consistent.
Network Problems: Issues with network connectivity between Kong and the upstream services can also cause this error.
These are common scenarios and configurations that might lead to the “failure to get a peer from the ring balancer” error in Kong Ingress.
Sure, here are the steps and tools for diagnosing the “failure to get a peer from the ring balancer” error in Kong Ingress:
Check Upstream Targets:
curl -H "kong-admin-token: kong" http://localhost:8001/upstreams/<upstream_name>/targets/all
/upstreams
endpoint.Verify Target Health:
curl http://localhost:8001/upstreams/<upstream_name>/health -s | jq .
/health
endpoint.Check Balancer Health:
curl http://localhost:8001/upstreams/<upstream_name>/health?balancer_health=1 -s | jq .
/health
endpoint with balancer_health=1
query parameter.Review Kong Logs:
/usr/local/kong/logs/error.log
tail -f /usr/local/kong/logs/error.log
Inspect Kong Configuration:
kong config db_export
Check Network/DNS Issues:
nslookup <upstream_target>
Update Kong Version:
kong version
These steps should help you diagnose and resolve the issue effectively.
To resolve the “failure to get a peer from the ring balancer” error in Kong Ingress, follow these steps:
Check Upstream Targets:
curl -H "kong-admin-token: kong" http://localhost:8001/upstreams/kong_upstream/targets/all
.Verify Target Health:
curl http://localhost:8001/upstreams/kong_upstream/health
.Balancer Health:
balancer_health=1
: curl http://localhost:8001/upstreams/kong_upstream/health?balancer_health=1
.Update Kong Version:
Configuration Changes:
Best Practices:
These steps should help you address and resolve the error effectively.
To prevent the “failure to get a peer from the ring balancer” error in Kong Ingress, consider the following strategies:
Implementing these strategies will help maintain a robust and reliable Kong Ingress setup, minimizing the chances of encountering the “failure to get a peer from the ring balancer” error.
The error message ‘failure to get a peer from the ring balancer’ in Kong Ingress indicates that the load balancer couldn’t connect to any upstream targets, leading to service disruptions and potential HTTP 503 errors.
This issue can be caused by various factors including:
To resolve this error, check:
Additionally, review Kong logs, inspect Kong configuration, and update Kong version. Regular monitoring, maintenance, and proactive measures such as:
can help prevent this error.