I have to admit, I never really considered that case, but can't you simply change the default location of the slotmem on one?
On Sep 11, 2012, at 10:01 AM, Zisis Lianas <zisis.lia...@consol.de> wrote: > Hi Jim, > > what do you think about the suggested directives of > "ProxyConfigIdPrefix" and "BalancerSlotmemDir"? > (any other way to solve this problem is also welcome) > > > Today I just ran into the same problem with httpd-2.4.3. > The apache config/logs directory is shared (NFS) on two > servers - when trying to restart both apache instances > at same time, the last one throws an error: > [proxy_balancer:debug] mod_proxy_balancer.c(760): AH01178: Doing balancers > create: 544,1 (6) > [slotmem_shm:debug] mod_slotmem_shm.c(300): AH02300: create > /apache/logs/slotmem-shm-sbf751527.shm: 544/6 > [proxy_balancer:emerg] (17)File exists: AH01179: balancer slotmem_create > failed > > When I restart this instance when the first one is up, > the restart is successful. > > > regards, > Zisis > > ----- Original Message ----- > From: "Jim Jagielski" <j...@jagunet.com> > To: dev@httpd.apache.org > Sent: Tuesday, May 1, 2012 8:43:46 PM > Subject: Re: httpd 2.4.2 - mod_proxy id name not unique > > Let me look into that... iirc, it was due to us wanting to > be able to persist data between restarts and using the time > as part of the id prevented that. But I could be mis-remembering. > > On Apr 30, 2012, at 7:50 AM, Zisis Lianas wrote: > >> hi, >> >> when mod_proxy currently is generating his "id", the name >> of this id is not very unique. So if you have a shared config/ >> logs dir for more instances, the slotmem-shm files generated in >> DefaultRuntimeDir are the same. Bit unlucky if working with shared >> file systems. >> >> In httpd-2.4.2/modules/proxy/mod_proxy.c line 1146 I can see >> the following code: >> #if 0 >> id = ap_proxy_hashfunc(apr_psprintf(p, "%pp-%" APR_TIME_T_FMT, ps, >> apr_time_now()), PROXY_HASHFUNC_DEFAULT); >> #else >> id = ap_proxy_hashfunc(apr_psprintf(p, "%pp", ps), PROXY_HASHFUNC_DEFAULT); >> #endif >> >> Primarily checked in with >> http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/proxy/mod_proxy.c?r1=1065749&r2=1065748&pathrev=1065749 >> >> >> If activating the first ap_proxy_hashfunc call, the generated names >> seem to be unique. Is there any reason this code is not used? Maybe >> we can set the "timed" version as default? >> >> >> >> best regards, >> Zisis >> >
