Richard, We front our cas cluster with a load balancer. When one of the servers goes down, it is removed from the pool. When the health check is 'UP', it is added into the pool. https://cas.host/cas/actuator/health
Ray ________________________________ From: 'Richard Frovarp' via CAS Community <cas-user@apereo.org> Sent: June 18, 2025 08:51 To: cas-user@apereo.org <cas-user@apereo.org> Subject: [cas-user] Deadlock on startup We have been able to trigger a deadlock on startup in CAS 7.1. I do not know if the problem exists on 7.2. I have only been able to replicate this on production, and not in a test environment. There appears to be a race condition between HTTP accepting connections, and CAS still starting. So as CAS is starting, it is listening on its port before startup has completed, and if a connection comes in at the right time, which our busy CAS production system can have happen, it will deadlock. Attached is the deadlock section from jstack when it happened. I don't know if it is possible to stop it from listening for connections until the end of startup or not. We're working on keeping traffic away from it on startup, but that is something every deployment would need to do. Thanks, Richard -- - Website: https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fapereo.github.io%2Fcas&data=05%7C02%7Crbon%40uvic.ca%7Ca83978e61d3f49afd32e08ddae82807e%7C9c61d3779894427cb13b1d6a51662b4e%7C0%7C0%7C638858597720620695%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=U8AYVpFJDrOnSolGSORpqVIq7bQ5lpjnwlNE9dFUcCI%3D&reserved=0<https://apereo.github.io/cas> - List Guidelines: https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgoo.gl%2F1VRrw7&data=05%7C02%7Crbon%40uvic.ca%7Ca83978e61d3f49afd32e08ddae82807e%7C9c61d3779894427cb13b1d6a51662b4e%7C0%7C0%7C638858597720642631%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=vrtbREILZ5XQzyazRqLjIAV9uVXio3FkydOYUeM%2BrC0%3D&reserved=0<https://goo.gl/1VRrw7> - Contributions: https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgoo.gl%2Fmh7qDG&data=05%7C02%7Crbon%40uvic.ca%7Ca83978e61d3f49afd32e08ddae82807e%7C9c61d3779894427cb13b1d6a51662b4e%7C0%7C0%7C638858597720655596%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=VOq4smgdpTjJMUWnrDzhrPNqr7i8KZhHI7%2B2DZp3ufU%3D&reserved=0<https://goo.gl/mh7qDG> --- You received this message because you are subscribed to the Google Groups "CAS Community" group. To unsubscribe from this group and stop receiving emails from it, send an email to cas-user+unsubscr...@apereo.org. To view this discussion visit https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fa%2Fapereo.org%2Fd%2Fmsgid%2Fcas-user%2Fb879f7b3-a5ca-44c9-80e3-021f3f93ceb4%2540ndsu.edu&data=05%7C02%7Crbon%40uvic.ca%7Ca83978e61d3f49afd32e08ddae82807e%7C9c61d3779894427cb13b1d6a51662b4e%7C0%7C0%7C638858597720670606%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ATAatTCxjzRkakNWqVfiGQKiXz15Uzcma0uCMhYbXX8%3D&reserved=0<https://groups.google.com/a/apereo.org/d/msgid/cas-user/b879f7b3-a5ca-44c9-80e3-021f3f93ceb4%40ndsu.edu>. -- - Website: https://apereo.github.io/cas - List Guidelines: https://goo.gl/1VRrw7 - Contributions: https://goo.gl/mh7qDG --- You received this message because you are subscribed to the Google Groups "CAS Community" group. To unsubscribe from this group and stop receiving emails from it, send an email to cas-user+unsubscr...@apereo.org. To view this discussion visit https://groups.google.com/a/apereo.org/d/msgid/cas-user/YQBP288MB0081A255440E98C1A9D793C9CE72A%40YQBP288MB0081.CANP288.PROD.OUTLOOK.COM.
