I have not done this, but I imagine that hibernate cache replication between instances is something that really needs to be done to have this sort of scaling configuration work.
I do remember there was a brief flirtation with hazelcast before reverting to ehcache. Is anybody using ehcache in this way ie. for replication in a clustering setup? On 16 March 2016 at 12:22, Lars Helge Øverland <l...@dhis2.org> wrote: > Hi Jason, > > there is the concept of "sticky sessions" which should ensure that a user > is always sent to the same server throughout his session: > > https://www.nginx.com/products/session-persistence/ > http://nginx.org/en/docs/http/load_balancing.html > > There are other issues with load balancing (session persistence in case a > server goes down, hibernate cache replication) but this could help. > > regards, > > Lars > > > > > > > On Tue, Mar 15, 2016 at 8:20 PM, Jason Phillips <ja...@hisp.org> wrote: > >> Aha! >> >> >> >> A little more reading goes a long way… ip_hash persistence appears to >> work – I can log in, anyway. >> >> For those of you interested, here’s the URL: >> http://nginx.org/en/docs/http/ngx_http_upstream_module.html#ip_hash >> >> >> >> If I have anything more relevant to share, I will… >> >> >> >> Kind Regards, >> >> *Jason Phillips* >> >> [image: hisp] >> *Information Systems / Infrastructure* >> >> *Health Information Systems Program____________________________________* >> >> eMail: ja...@hisp.org >> 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 disclai...@hisp.org 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. >> >> >> >> >> >> >> >> *From:* Jason Phillips [mailto:ja...@hisp.org] >> *Sent:* Tuesday, 15 March 2016 8:34 PM >> *To:* DHIS 2 Users list >> *Subject:* Load-balancing DHIS2 Webservers >> >> >> >> 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: ja...@hisp.org >> 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 disclai...@hisp.org 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 disclai...@hisp.org >> <disclai...@hisp.org> 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.* >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~dhis2-users >> Post to : dhis2-users@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~dhis2-users >> More help : https://help.launchpad.net/ListHelp >> >> > > > -- > Lars Helge Øverland > Lead developer, DHIS 2 > University of Oslo > Skype: larshelgeoverland > http://www.dhis2.org <https://www.dhis2.org/> > > > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-users > Post to : dhis2-users@lists.launchpad.net > Unsubscribe : https://launchpad.net/~dhis2-users > More help : https://help.launchpad.net/ListHelp > >
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