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From: "Michele Mase'" <michele.mase@gmail.com>
Date: Tue, 24 Jan 2017 19:10:06 +0100
Message-ID: <CAC=HunsE-yVFT0ydafOqRnqGBtXb33yq96YVMtXzE2xQFH19Wg@mail.gmail.com>
To: Httpd Users List <users@httpd.apache.org>
Content-Type: multipart/alternative; boundary=94eb2c124794cf79b20546db07e8
Subject: [users@httpd] Unable to fork new process
archived-at: Tue, 24 Jan 2017 18:10:32 -0000

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All,
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) +
mod_ssl.
Every 10 days, the system has problems, and in the error log i found dozen
of:

 [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:
  core.c
  worker.c
  http_core.c
  mod_so.c

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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<div dir=3D"ltr"><div><div>All,<br>I&#39;ve a apache web server with 600 we=
b sites as reverse proxy. The average of req. is more than 100 req/sec duri=
ng all the day.<br>The apache is a 2.2.15 release 56.el6_8.3 (RedHat 6.x sy=
stem up to date) + mod_ssl.<br>Every 10 days, the system has problems, and =
in the error log i found dozen of:<br><br>=C2=A0[error] (12)Cannot allocate=
 memory: fork: Unable to fork new process<br><br></div><div>The temporary s=
olution for me is the following: after an alert mail from the system monito=
ring server, I must restart the httpd using:<br></div><div>service httpd st=
op; killall httpd.worker; killall -9 httpd.worker; service httpd start<br><=
/div><div>Adding more ram to the system does not help.<br></div><div><br></=
div>Any suggestion?<br></div>Best regards<br><br>apachectl -l<br>Compiled i=
n modules:<br>=C2=A0 core.c<br>=C2=A0 worker.c<br>=C2=A0 http_core.c<br>=C2=
=A0 mod_so.c<br><br>apachectl -M<br>Loaded Modules:<br>=C2=A0core_module (s=
tatic)<br>=C2=A0mpm_worker_module (static)<br>=C2=A0http_module (static)<br=
>=C2=A0so_module (static)<br>=C2=A0log_post_module (shared)<br>=C2=A0evasiv=
e20_module (shared)<br>=C2=A0auth_basic_module (shared)<br>=C2=A0auth_diges=
t_module (shared)<br>=C2=A0authn_file_module (shared)<br>=C2=A0authn_alias_=
module (shared)<br>=C2=A0authn_anon_module (shared)<br>=C2=A0authn_dbm_modu=
le (shared)<br>=C2=A0authn_default_module (shared)<br>=C2=A0authz_host_modu=
le (shared)<br>=C2=A0authz_user_module (shared)<br>=C2=A0authz_owner_module=
 (shared)<br>=C2=A0authz_groupfile_module (shared)<br>=C2=A0authz_dbm_modul=
e (shared)<br>=C2=A0authz_default_module (shared)<br>=C2=A0ldap_module (sha=
red)<br>=C2=A0authnz_ldap_module (shared)<br>=C2=A0include_module (shared)<=
br>=C2=A0log_config_module (shared)<br>=C2=A0logio_module (shared)<br>=C2=
=A0env_module (shared)<br>=C2=A0ext_filter_module (shared)<br>=C2=A0mime_ma=
gic_module (shared)<br>=C2=A0expires_module (shared)<br>=C2=A0deflate_modul=
e (shared)<br>=C2=A0headers_module (shared)<br>=C2=A0usertrack_module (shar=
ed)<br>=C2=A0setenvif_module (shared)<br>=C2=A0mime_module (shared)<br>=C2=
=A0dav_module (shared)<br>=C2=A0status_module (shared)<br>=C2=A0autoindex_m=
odule (shared)<br>=C2=A0info_module (shared)<br>=C2=A0dav_fs_module (shared=
)<br>=C2=A0vhost_alias_module (shared)<br>=C2=A0negotiation_module (shared)=
<br>=C2=A0dir_module (shared)<br>=C2=A0actions_module (shared)<br>=C2=A0spe=
ling_module (shared)<br>=C2=A0userdir_module (shared)<br>=C2=A0alias_module=
 (shared)<br>=C2=A0substitute_module (shared)<br>=C2=A0rewrite_module (shar=
ed)<br>=C2=A0proxy_module (shared)<br>=C2=A0proxy_balancer_module (shared)<=
br>=C2=A0proxy_ftp_module (shared)<br>=C2=A0proxy_http_module (shared)<br>=
=C2=A0proxy_ajp_module (shared)<br>=C2=A0proxy_connect_module (shared)<br>=
=C2=A0cache_module (shared)<br>=C2=A0suexec_module (shared)<br>=C2=A0disk_c=
ache_module (shared)<br>=C2=A0cgi_module (shared)<br>=C2=A0version_module (=
shared)<br>=C2=A0unique_id_module (shared)<br>=C2=A0ssl_module (shared)<br>=
=C2=A0reqtimeout_module (shared)<br>Syntax OK<br></div>

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