We have configured our CSS to do basic Roundrobin load balancing between 3 webservers. Occasionally we notice that between 1/3 and 1/2 of the requested page content loads and then the browser gives a page cannoot be loaded response. A refresh then loads teh page correctly and quickly.
I believe I can try to sort out what the CSS is doing by using logging. I have set
logging as follows....
IP Address: 10.9.x.x
Logs Sent: 278
Log Level: 7
I am seeing some log entries but no where near what I would expect where each connection (GET request) would generate a log entry.
Can someone help and let me know if I am correct in my assumptions on how logging works or if there is a way to see all activity on teh CSS.
Do you wish to log all subsystems on the CSS? Or have you enabled logging at level-7 for a specific subsystem?
As for the balancing issues you are experiencing do you have any type of session persistence enabled on the content rule the 3 webservers are a member of? The time that 1/3, or 1/2 of the connections are unable to load are you able to pinpoint what destination server the connections landed on? During these load issues do any of the services register a state transition?
As for the logging on the CSS, do you have the following command setup to allow logging of all subsytems?
logging subsystem all level debug-7
In all honesty you really don't need to log everything within each subsystem. If you wish to see when a service experiences a state transition (Alive, Down, Suspended) the following log command should suffice:
logging subsystem netman level notice-5
When a service changes it's state to either "Down" or "suspended" the CSS will generate a log using the netman subsystem at level 2 (critical). However, if the service passes it's keep-alive check again the CSS will generate a log entry using the same netman subsystem but at level 5 (notice). This is why logging the netman subsystem at level 5 will show all state transitions. Unless you really want to see everything on each subsystem then you can of course log everything! :)
Unfortunately, I cannot tell you were the CSS is forwarding the syslog messages too. The location of the syslog messages sent by the CSS to host 10.9.x.x is dependent on how you have the syslog application setup on the server. I can tell the logging configuration on your CSS is correct. The load balancer shows it has sent 278 log messages to the 10.9.x.x server. If anything you may want to increase the facility level on your configuration.
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