topic Re: Load balancer of Web UI in Dynatrace Managed Q&A

Load balancer of Web UI

yohnishi — Mon, 29 Jun 2020 10:43:14 GMT

Hi,

I have a question of load balancing of Web UI on the environment of Managed server clustering. (This question was asked from our customer. ) I understand the load balance of Agent is controlled with Agent side information. But I can not understand the Load balancing of "Web UI side" yet.

So, How does the Web UI control the load balancing? (or do we have to set the other load balancer component for Managed server clustering?)

Regard,
Yasuo Ohnishi

Re: Load balancer of Web UI

Radoslaw_Szulgo — Mon, 29 Jun 2020 10:51:03 GMT

Take a look at my (very old, but still current) blog post on dynatrace managed session affinity and stickyness: https://www.dynatrace.com/news/blog/session-stickiness-persistence-across-dynatrace-managed-cluster-nodes-eap/

In general you can set up LB in front on cluster. You need to make sure to have up-to-date node IPs that are accessible by your users. For the "health" you can use "/rest/health" endpoint.

Also redirect the traffic always to :443 port (NGINX).

Re: Load balancer of Web UI

yohnishi — Mon, 29 Jun 2020 12:45:02 GMT

Hi Radoslaw,

Thank you for your replay, I understand the load balancing is controlled with nginx.

But, if the cluster is consisted with 2 node and one server is down, the user have to access with the live server' IP address?

So, If the user does not have Load barancer, is it necessary to switch the node's IP address for WebUI?

Regards,
Yasuo Ohnishi.

Re: Load balancer of Web UI

Radoslaw_Szulgo — Mon, 29 Jun 2020 14:31:15 GMT

That is true. That's why an external LB is helpful here. NGINX will redirect to the other node if the server is UP there. If whole node is down - then you'll end up in "Not found".

Re: Load balancer of Web UI

chao_wang — Thu, 16 Dec 2021 02:45:59 GMT

Hi Radoslaw,

How to config "health check" in nginx? According to the official https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/ Nginx supply http ,but our DT CLUSTER is https.