On 6/18/2012 3:17 PM, Praveen Baratam wrote: > > Can mod_proxy failover with out ever returning an error to the client? > If active node fails I need mod_proxy to try the Standby for the same > request and not just from the subsequent request! > > In our setup we are using mod_proxy_balancer to manage failover of > backend servers. Backend servers may return an error code instead of > timing out when some service such as NFS fails and we want such > servers also to be marked as failed nodes. Hence we are using > */failonstatus/* directive for the balancer. > > |<Proxy balancer://failover> > ProxySet failonstatus=503 > BalancerMember http://active/ retry=30 > # the hot standby > BalancerMember http://standby/ status=+H retry=0 > </Proxy> > > |RewriteBase / > RewriteRule ^(.*)$ balancer://failover/$1 [P,L] > > Currently the failover works perfectly with one glitch. When active > node fails the user gets a 503 error and from the next request the > Standby server takes over. > > I dont want even a single request to fail though. > > Can this be achieved? > > Thank you! >
Praveen; I'm afraid there are no provisions available to retry a request to another backend server once it has been sent to a balancer member. I would like to fix this some day but I am just not aware of a place that this can be done currently as the balancer willy only attempt another backend on connection failure only. -- Daniel Ruggeri
