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I have a Magento installation running on x-large Amazon server. I have Varnish, memcached and eAccelerator installed on the server. At first everything was working fine, but then at some point it stopped working, throwing 503 error with Varnish cache stamp below it. When I disable eaccelerator, error is gone and site is working. This is my eaccelerator config:

extension="eaccelerator.so"
eaccelerator.shm_size = "512"
eaccelerator.cache_dir = "/var/cache/php-eaccelerator"
eaccelerator.enable = "1"
eaccelerator.optimizer = "1"
eaccelerator.debug = 0
eaccelerator.log_file = "/var/log/httpd/eaccelerator_log"
eaccelerator.name_space = ""
eaccelerator.check_mtime = "1"
eaccelerator.filter = ""
eaccelerator.shm_ttl = "0"
eaccelerator.shm_prune_period = "0"
eaccelerator.shm_only = "0"
eaccelerator.allowed_admin_path = ""

any hints?

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  • Is it Varnish throwing the 503, or the application? Commented Oct 24, 2012 at 10:53
  • I think it's Varnish. Application is unreachable, as phpinfo() file is also unavailable Commented Oct 24, 2012 at 10:54
  • Can you try to issue a request directly to Apache without going through Varnish? Commented Oct 24, 2012 at 10:55
  • I don't know how to do that :/ Commented Oct 24, 2012 at 10:55
  • 1
    Maybe. Check if you can find your Apache logs and see if you find anything related in the errorlog. Commented Oct 24, 2012 at 12:06

1 Answer 1

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Problem was caused by the fact that kernel allowed only 32M of shared memory, as defined in /proc/sys/kernel/shmmax , while I was trying to allocate 512M.

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