On Mon, Dec 7, 2020 at 6:33 PM Wendell Hatcher <wendellhatcher1...@gmail.com> wrote: > > Yann, quick question would it be ok to have a cronjob running daily maybe at > slow periods that runs a script to delete the sephmore segments using a > script while apache is running? It shouldn't cause issues with the apache > server processing data correct?
I think that the error is about shared memories (SHM), not semaphores (your httpd -V output shows "-D APR_USE_PROC_PTHREAD_SERIALIZE" which indicates the use of pthread global mutexes, not backed by a system descriptor/inode, so nothing to cleanup really). The SHMs usually do have a descriptor or inode to delete somewhere on your system, but I don't think it's safe to do so while httpd is running. By the way, you didn't tell which SHM mechanism was used by the APR library on your system (which system? httpd/APR compiled manually? SysV, POSIX or other SHM mechanism? Where do your SHMs land on the filesystem?). It is not shown by httpd -V unfortunately (I added it to trunk lately, but it's not in any 2.4 version yet). > Second ndly, we want to run a script during our apache stop process that will > deleting the files from the shm folder we are hoping this will reschedule le > our hanging apache servers during stops and starts with a slotmem error. I'm not sure to understand this, deleting the SHMs could avoid conflicts temporarily but as soon as all the httpd instances are started again, the conflicts will show up again if they exist in the configuration files. One particular thing to look at are the URLs used in <Proxy balancer://[id]> declarations, in all the instances. Each balancer should have a unique [id], system wide, because a SHM will be created (system wide) based on this [id]. This is usually not an issue with a single httpd instance where uniqueness makes sense and balancer1,..,n is simply/often used, but when this first instance gets copied to create others then it breaks.. You can use almost anything as [id], provided it's unique and the same [id] is used in the associated ProxyPass. It can be a UUID for example, a tool like `uuidgen` can generate one when a new balancer needs to be added. Hth, Yann. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
