Re: Varnish as load balancer
]] "Carlos Oliva G." | In the current setup I'm skipping Lighttpd altogether and began using | Varnish as a load balancer altogether as well, with the 'directors' | feature. However I'm still missing the last bit of the requested | functionality that is to evenly balance all the requests from | 'anonymous' users that aren't registered/logged into the system (which | I am already identifying in the sub_rcvd function of my VCL), but for | registered users to preserve their session by redirecting them always | to the same backend server. I know I can create a 'hash' using some | relatively unique values, as the originating IP address + the User | Agent and a session-dependent cookie value, but what I don't know is | (if possible), how to use this hash to determinate to what backend | server to direct the request to. We currently don't have a hashing load balancer (which is what you seem to want). (Patches accepted, or Redpill Linpro can get you a quote on how much work it is to develop it.) What you could do is have the backend set a cookie with its name when the user logs in, and then choose backend depending on cookie value. Another alternative is to use nginx or similar as Varnish' backend and let that do the hashing and load balancing. I have been told it's quite good, but I don't have experience with it myself. -- Tollef Fog Heen Redpill Linpro -- Changing the game! t: +47 21 54 41 73 ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Newbie question
]] Monah Baki | Here is part of the logs, how can I tell it's working? It doesn't seem to be caching, most likely because the backend sets a cookie (which means we, by default, don't cache). -- Tollef Fog Heen Redpill Linpro -- Changing the game! t: +47 21 54 41 73 ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: varnish experience on high request rates
]] Václav Bílek | Is there anyone using varnish on such request rates? If yes, what HW do | you use. I've had Varnish serve about 20k requests/sec on a single node. I've also had it fill a 1Gbit pipe on a single node. Hardware in both cases was some reasonably new Xeon system with enough memory to fit your working set. -- Tollef Fog Heen Redpill Linpro -- Changing the game! t: +47 21 54 41 73 ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish as load balancer
On Mon, May 18, 2009 at 11:13:24AM +0200, Tollef Fog Heen wrote: > ]] "Carlos Oliva G." > > | In the current setup I'm skipping Lighttpd altogether and began using > | Varnish as a load balancer altogether as well, with the 'directors' > | feature. However I'm still missing the last bit of the requested > | functionality that is to evenly balance all the requests from > | 'anonymous' users that aren't registered/logged into the system (which > | I am already identifying in the sub_rcvd function of my VCL), but for > | registered users to preserve their session by redirecting them always > | to the same backend server. I know I can create a 'hash' using some > | relatively unique values, as the originating IP address + the User > | Agent and a session-dependent cookie value, but what I don't know is > | (if possible), how to use this hash to determinate to what backend > | server to direct the request to. > > We currently don't have a hashing load balancer (which is what you seem > to want). (Patches accepted, or Redpill Linpro can get you a quote on > how much work it is to develop it.) > > What you could do is have the backend set a cookie with its name when > the user logs in, and then choose backend depending on cookie value. > > Another alternative is to use nginx or similar as Varnish' backend and > let that do the hashing and load balancing. I have been told it's quite > good, but I don't have experience with it myself. you could take a look at haproxy (http://haproxy.1wt.eu/) copes with pretty high loads and allows you to inject cookies for sticky sessions. Greetings Christoph ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
