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From "Michele Mase'" <>
Subject [users@httpd] Unable to fork new process
Date Tue, 24 Jan 2017 18:10:06 GMT
I've a apache web server with 600 web sites as reverse proxy. The average
of req. is more than 100 req/sec during all the day.
The apache is a 2.2.15 release 56.el6_8.3 (RedHat 6.x system up to date) +
Every 10 days, the system has problems, and in the error log i found dozen

 [error] (12)Cannot allocate memory: fork: Unable to fork new process

The temporary solution for me is the following: after an alert mail from
the system monitoring server, I must restart the httpd using:
service httpd stop; killall httpd.worker; killall -9 httpd.worker; service
httpd start
Adding more ram to the system does not help.

Any suggestion?
Best regards

apachectl -l
Compiled in modules:

apachectl -M
Loaded Modules:
 core_module (static)
 mpm_worker_module (static)
 http_module (static)
 so_module (static)
 log_post_module (shared)
 evasive20_module (shared)
 auth_basic_module (shared)
 auth_digest_module (shared)
 authn_file_module (shared)
 authn_alias_module (shared)
 authn_anon_module (shared)
 authn_dbm_module (shared)
 authn_default_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 authz_owner_module (shared)
 authz_groupfile_module (shared)
 authz_dbm_module (shared)
 authz_default_module (shared)
 ldap_module (shared)
 authnz_ldap_module (shared)
 include_module (shared)
 log_config_module (shared)
 logio_module (shared)
 env_module (shared)
 ext_filter_module (shared)
 mime_magic_module (shared)
 expires_module (shared)
 deflate_module (shared)
 headers_module (shared)
 usertrack_module (shared)
 setenvif_module (shared)
 mime_module (shared)
 dav_module (shared)
 status_module (shared)
 autoindex_module (shared)
 info_module (shared)
 dav_fs_module (shared)
 vhost_alias_module (shared)
 negotiation_module (shared)
 dir_module (shared)
 actions_module (shared)
 speling_module (shared)
 userdir_module (shared)
 alias_module (shared)
 substitute_module (shared)
 rewrite_module (shared)
 proxy_module (shared)
 proxy_balancer_module (shared)
 proxy_ftp_module (shared)
 proxy_http_module (shared)
 proxy_ajp_module (shared)
 proxy_connect_module (shared)
 cache_module (shared)
 suexec_module (shared)
 disk_cache_module (shared)
 cgi_module (shared)
 version_module (shared)
 unique_id_module (shared)
 ssl_module (shared)
 reqtimeout_module (shared)
Syntax OK

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