dhis2-users team mailing list archive

[Jason Phillips <jason@xxxxxxxx>]

Hi, community (and Oslo team),



I am trying to set up a load-balanced DHIS2 web-server system; we have a
web server that’s getting slaughtered with incoming data, and we want to
distribute the load to other physical servers.  I’ve done some
experimentation, a fair amount of web-trawling, and using a dedicated nginx
virtual server, have (semi)successfully set up a load-balancing model like
so:





My problem is that going through the load-balancer, I appear to need some
kind of setting that will “keep” me at the Web-Server I first started with
– the load-balancer is set to round-robin, currently, with the following
settings:



upstream dhis2 {

        server webserver1.dhis.hisp.org;

        server webserver2.dhis.hisp.org;

        }



server {

        listen 80;

        server_name www.hisp.org hisp.org;



        location / {

                include /etc/nginx/proxy_params;

                proxy_pass http://dhis2;

        }

        location /staging {

                include /etc/nginx/proxy_params;

                proxy_pass http://dhis2;

        }

        location /training {

                include /etc/nginx/proxy_params;

                proxy_pass http://dhis2;

        }

}



What’s happening is that I attempt to log in, and get immediately switched
“round-robin” style to the second server for the post (promptly getting the
“forgot password?” prompt).
Nett result: I can’t log in…

If I log in to either one of the webservers directly, everything is fine
and dandy, but going through the LB is a no-go, so far.  (I have noticed
some interesting behaviour from two web servers connected to the same Db,
and would be keen to hear what input anyone has on that score – bad idea?
If so, why?  And what can be done to address the issues? – but I shall save
that for a separate post…)



Has anyone done any research/experimentation/development with a
load-balancing model of DHIS2 in a web-server context?  I would be most
interested to hear input.



Kind Regards,

*Jason Phillips*

[image: hisp]
*Information Systems / Infrastructure*

*Health Information Systems Program____________________________________*

eMail:               jason@xxxxxxxx
Landline:          +27 21 712 0170
Mobile:             +27 72 973 7250
Skype:             jason.n.phillips

This message and any attachments are subject to a disclaimer published at
http://www.hisp.org/policies.html#comms_disclaimer.  Please read the
disclaimer before opening any attachment or taking any other action in
terms of this electronic transmission.  If you cannot access the
disclaimer, kindly send an email to disclaimer@xxxxxxxx and a copy will be
provided to you. By replying to this e-mail or opening any attachment you
agree to be bound by the provisions of the disclaimer.

-- 


*This message and any attachments are subject to a disclaimer published at 
http://www.hisp.org/policies.html#comms_disclaimer 
<http://www.hisp.org/policies.html#comms_disclaimer>.  Please read the 
disclaimer before opening any attachment or taking any other action in 
terms of this electronic transmission.  If you cannot access the 
disclaimer, kindly send an email to disclaimer@xxxxxxxx 
<disclaimer@xxxxxxxx> and a copy will be provided to you. By replying to 
this e-mail or opening any attachment you agree to be bound by the 
provisions of the disclaimer.*