Zabbix UI Load Balancer

[eduwutzl]

Hello,

I am with my zabbix frontend (are 3) and today I do loadbalancer with IP_HASH method, which makes my sticky connection on the servers.

My desire is to change the method for loadbalancer round-robin but when I do this map editing is with a really strange behavior.

Well, I shared the /var/www/html/ between my servers thinking that this would solve the problem but not solved.

Does anyone have any idea how to solve this?

[zalex_ua]

I'd take a look to "php shared session between servers" direction, although I'm not sure it could be related to your possible issues.

[jan.garaj]

My experience is that you don't need to share session between servers -
GKE 3 node cluster / 10 containers - https://www.youtube.com/watch?v=F2dBzuDy0Ns

Zabbix sessions are saved in Zabbix DB (table sessions) = you don't need sticky sessions, IP_HASH, ... You can use round-robin balancing without any problem. Also you don't need to share /var/www/html/ between servers.

Which version of Zabbix are you balancing and what is "a really strange behavior"?

[kloczek]

Before Putina more web frontends behind ŁBY it is good to do as much as it is possible to improve speed of single node. One of those improvements is install zend optimiser. It reduces CPU usage and DS/c by up to 10%.

[eduwutzl]

Hi,

Well, the behavior is when I'm doing 'editing' map, my icons disappear when I'm using round-robin method.

All the rest of the environment, functions normally, with the exception editing / creating maps.

My version is 3.0.2, the frontends are actually docker containers and the balancer is a HAProxy.

the frontend of the containers do not run apache, they are running nginx and this behavior only happens in this place (editing maps) using the round-robin method.

With ip-hash operation is normal.

I appreciate everyone's attention and await...

[jan.garaj]

Which Docker image are you using? I don't see why you have a problem with icons. Did you enable some caching?

[eduwutzl]

Image was myself I wrote.
Yes, I have a reverse proxy in front.
I'll turn off some caches to do a test ..... post here the result.

[eduwutzl]

Still not solved .. but did the following test to see if it becomes clearer to understand this problem.

I pulled out a print and also realized that the url of map background image is

http://zabbix.mydomain.com/imgstore.php?imageid=aea2502138f55af2809a728d6308e348

If I open in another tab and give it some F5 several times and gets the image icon not found.




NGINX BALANCER CONFIGURATION FILE:

upstream zabbix.domain.com {

         server 104.131.144.23:8080;
         server 104.131.144.23:8081;
         server 104.131.144.23:8082;
         server 104.131.144.23:8085;
         server 104.131.144.23:8086;
         server 104.131.144.23:8087;
 }

server {
     listen 80;
     server_name zabbix.domain.com;
     location / {

     proxy_pass [url]http://zabbix.domain.com;[/url]
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
     }
}

[jan.garaj]

It's time to check your web backend logs. Which backend is able and which one is not able to server your map?