Looks like I did not respond to the right thread so I paste my
response below. If you got it twice my apologies.
There seems to be no difference in configuration file except for some comments:
```
diff -Bbde /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.conf.roc
ky
8a
# See the httpd.conf(5) man page for more information on this configuration,
# and httpd.service(8) on using and configuring the httpd service.
#
.
```
I will paste complete Rocky config for completeness at the end of this message.
EnableMMAP and EnableSendfile are set to on, differently to defaults
specified in comments. This is default system configuration present on
both Rocky 8 and Centos 7. I removed httpd and all config files and
installed it again to make sure.
```
# Defaults if commented: EnableMMAP On, EnableSendfile Off
#
#EnableMMAP off
EnableSendfile on
```
Both systems return:
```
ulimit -n
1024
```
There is no custom config for httpd:
```
stat /etc/systemd/system/httpd.service.d
stat: cannot stat ‘/etc/systemd/system/httpd.service.d’: No such file
or directory
```
systemd itself seems to not apply any limit on both systems:
```
grep LimitNOFILE /etc/systemd/system.conf
#DefaultLimitNOFILE=
```
After enabling trace there is a lot of messenges about too many open
connections and killing keepalive connections. Example snippet:
```
[Mon May 22 11:57:40.146451 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(1808): Too many open connections (73), not
accepting new conns in
this process
[Mon May 22 11:57:40.146455 2023] [mpm_event:trace1] [pid 7710:tid
139800984155904] event.c(1811): Idle workers: 0
[Mon May 22 11:57:40.146457 2023] [mpm_event:trace1] [pid 7710:tid
139800984155904] event.c(1574): All workers are busy or dying, will
close 2 keep-alive co
nnections
[Mon May 22 11:57:40.146526 2023] [mpm_event:debug] [pid 7379:tid
139801403561728] event.c(492): AH00457: Accepting new connections
again: 50 active conns (
27 lingering/0 clogged/0 suspended), 7 idle workers
[Mon May 22 11:57:40.146686 2023] [mpm_event:debug] [pid 7511:tid
139800849938176] event.c(1808): Too many open connections (86), not
accepting new conns in
this process
[Mon May 22 11:57:40.146698 2023] [mpm_event:trace1] [pid 7511:tid
139800849938176] event.c(1811): Idle workers: 11
[Mon May 22 11:57:40.146701 2023] [mpm_event:trace1] [pid 7511:tid
139800849938176] event.c(1574): All workers are busy or dying, will
close 34 keep-alive c
onnections
[Mon May 22 11:57:40.146701 2023] [mpm_event:trace1] [pid 7644:tid
139801336452864] event.c(1574): All workers are busy or dying, will
close 2 keep-alive co
nnections
[Mon May 22 11:57:40.146812 2023] [mpm_event:debug] [pid 7511:tid
139800849938176] event.c(492): AH00457: Accepting new connections
again: 85 active conns (
52 lingering/0 clogged/0 suspended), 6 idle workers
[Mon May 22 11:57:40.146955 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(492): AH00457: Accepting new connections
again: 73 active conns (
58 lingering/0 clogged/0 suspended), 9 idle workers
[Mon May 22 11:57:40.148250 2023] [mpm_event:debug] [pid 7162:tid
139800841545472] event.c(492): AH00457: Accepting new connections
again: 48 active conns (
25 lingering/0 clogged/0 suspended), 2 idle workers
[Mon May 22 11:57:40.148562 2023] [mpm_event:debug] [pid 7162:tid
139800841545472] event.c(1808): Too many open connections (48), not
accepting new conns in
this process
[Mon May 22 11:57:40.148573 2023] [mpm_event:trace1] [pid 7162:tid
139800841545472] event.c(1811): Idle workers: 0
[Mon May 22 11:57:40.148921 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(1808): Too many open connections (70), not
accepting new conns in
this process
[Mon May 22 11:57:40.148930 2023] [mpm_event:trace1] [pid 7710:tid
139800984155904] event.c(1811): Idle workers: 1
[Mon May 22 11:57:40.149594 2023] [mpm_event:debug] [pid 7511:tid
139800849938176] event.c(1808): Too many open connections (69), not
accepting new conns in
this process
[Mon May 22 11:57:40.149603 2023] [mpm_event:trace1] [pid 7511:tid
139800849938176] event.c(1811): Idle workers: 1
[Mon May 22 11:57:40.149630 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(492): AH00457: Accepting new connections
again: 61 active conns (
38 lingering/0 clogged/0 suspended), 2 idle workers
[Mon May 22 11:57:40.149776 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(1808): Too many open connections (63), not
accepting new conns in
this process
[Mon May 22 11:57:40.149782 2023] [mpm_event:trace1] [pid 7710:tid
139800984155904] event.c(1811): Idle workers: 0
[Mon May 22 11:57:40.149882 2023] [mpm_event:debug] [pid 7710:tid
139800984155904] event.c(492): AH00457: Accepting new connections
again: 61 active conns (
38 lingering/0 clogged/0 suspended), 2 idle workers
[Mon May 22 11:57:40.149913 2023] [mpm_event:debug] [pid 7511:tid
139800849938176] event.c(492): AH00457: Accepting new connections
again: 63 active conns (
40 lingering/0 clogged/0 suspended), 2 idle workers
[Mon May 22 11:57:40.150210 2023] [mpm_event:debug] [pid 7511:tid
139800849938176] event.c(1808): Too many open connections (62), not
accepting new conns in
this process
[Mon May 22 11:57:40.150216 2023] [mpm_event:trace1] [pid 7511:tid
139800849938176] event.c(1811): Idle workers: 0
```
On Centos with httpd 2.4.6 log looks similar however I don't see any
mentions about killing keepalive connections:
```
[Tue May 23 08:21:24.206092 2023] [mpm_event:trace1] [pid 2123:tid
140575713961728] event.c(1583): Idle workers: 22
[Tue May 23 08:21:24.206300 2023] [mpm_event:debug] [pid 2291:tid
140575713961728] event.c(1580): Too many open connections (72), not
accepting new conns in
this process
[Tue May 23 08:21:24.206303 2023] [mpm_event:trace1] [pid 2291:tid
140575713961728] event.c(1583): Idle workers: 23
[Tue May 23 08:21:24.214594 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 71 active conns (
1 lingering/0 clogged/0 suspended), 24 idle workers
[Tue May 23 08:21:24.214651 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (71), not
accepting new conns in
this process
[Tue May 23 08:21:24.214657 2023] [mpm_event:trace1] [pid 2402:tid
140575713961728] event.c(1583): Idle workers: 17
[Tue May 23 08:21:24.224628 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 71 active conns (
1 lingering/0 clogged/0 suspended), 24 idle workers
[Tue May 23 08:21:24.224677 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (71), not
accepting new conns in
this process
[Tue May 23 08:21:24.224681 2023] [mpm_event:trace1] [pid 2402:tid
140575713961728] event.c(1583): Idle workers: 18
[Tue May 23 08:21:24.224986 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 70 active conns (
2 lingering/0 clogged/0 suspended), 23 idle workers
[Tue May 23 08:21:24.225018 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (70), not
accepting new conns in
this process
[Tue May 23 08:21:24.225024 2023] [mpm_event:trace1] [pid 2402:tid
140575713961728] event.c(1583): Idle workers: 19
[Tue May 23 08:21:24.227927 2023] [mpm_event:debug] [pid 2121:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 73 active conns (
4 lingering/0 clogged/0 suspended), 25 idle workers
[Tue May 23 08:21:24.227978 2023] [mpm_event:debug] [pid 2121:tid
140575713961728] event.c(1580): Too many open connections (73), not
accepting new conns in
this process
[Tue May 23 08:21:24.227982 2023] [mpm_event:trace1] [pid 2121:tid
140575713961728] event.c(1583): Idle workers: 21
[Tue May 23 08:21:24.233929 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 70 active conns (
2 lingering/0 clogged/0 suspended), 24 idle workers
[Tue May 23 08:21:24.233981 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (70), not
accepting new conns in
this process
[Tue May 23 08:21:24.233987 2023] [mpm_event:trace1] [pid 2402:tid
140575713961728] event.c(1583): Idle workers: 21
[Tue May 23 08:21:24.234230 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 72 active conns (
2 lingering/0 clogged/0 suspended), 24 idle workers
[Tue May 23 08:21:24.234247 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (72), not
accepting new conns in
this process
[Tue May 23 08:21:24.234250 2023] [mpm_event:trace1] [pid 2402:tid
140575713961728] event.c(1583): Idle workers: 22
[Tue May 23 08:21:24.234601 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(386): AH00457: Accepting new connections
again: 70 active conns (
0 lingering/0 clogged/0 suspended), 24 idle workers
[Tue May 23 08:21:24.234618 2023] [mpm_event:debug] [pid 2402:tid
140575713961728] event.c(1580): Too many open connections (70), not
accepting new conns in
this process
```
Complete httpd.conf:
```
#
# This is the main Apache HTTP server configuration file. It contains the
# configuration directives that give the server its instructions.
# See <URL:http://httpd.apache.org/docs/2.4/> for detailed information.
# In particular, see
# <URL:http://httpd.apache.org/docs/2.4/mod/directives.html>
# for a discussion of each configuration directive.
#
# See the httpd.conf(5) man page for more information on this configuration,
# and httpd.service(8) on using and configuring the httpd service.
#
# Do NOT simply read the instructions in here without understanding
# what they do. They're here only as hints or reminders. If you are unsure
# consult the online docs. You have been warned.
#
# Configuration and logfile names: If the filenames you specify for many
# of the server's control files begin with "/" (or "drive:/" for Win32), the
# server will use that explicit path. If the filenames do *not* begin
# with "/", the value of ServerRoot is prepended -- so 'log/access_log'
# with ServerRoot set to '/www' will be interpreted by the
# server as '/www/log/access_log', where as '/log/access_log' will be
# interpreted as '/log/access_log'.
#
# ServerRoot: The top of the directory tree under which the server's
# configuration, error, and log files are kept.
#
# Do not add a slash at the end of the directory path. If you point
# ServerRoot at a non-local disk, be sure to specify a local disk on the
# Mutex directive, if file-based mutexes are used. If you wish to share the
# same ServerRoot for multiple httpd daemons, you will need to change at
# least PidFile.
#
ServerRoot "/etc/httpd"
#
# Listen: Allows you to bind Apache to specific IP addresses and/or
# ports, instead of the default. See also the <VirtualHost>
# directive.
#
# Change this to Listen on specific IP addresses as shown below to
# prevent Apache from glomming onto all bound IP addresses.
#
#Listen 12.34.56.78:80
Listen 80
#
# Dynamic Shared Object (DSO) Support
#
# To be able to use the functionality of a module which was built as a DSO you
# have to place corresponding `LoadModule' lines at this location so the
# directives contained in it are actually available _before_ they are used.
# Statically compiled modules (those listed by `httpd -l') do not need
# to be loaded here.
#
# Example:
# LoadModule foo_module modules/mod_foo.so
#
Include conf.modules.d/*.conf
#
# If you wish httpd to run as a different user or group, you must run
# httpd as root initially and it will switch.
#
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
# running httpd, as with most system services.
#
User apache
Group apache
# 'Main' server configuration
#
# The directives in this section set up the values used by the 'main'
# server, which responds to any requests that aren't handled by a
# <VirtualHost> definition. These values also provide defaults for
# any <VirtualHost> containers you may define later in the file.
#
# All of these directives may appear inside <VirtualHost> containers,
# in which case these default settings will be overridden for the
# virtual host being defined.
#
#
# ServerAdmin: Your address, where problems with the server should be
# e-mailed. This address appears on some server-generated pages, such
# as error documents. e.g. admin@xxxxxxxxxxxxxxx
#
ServerAdmin root@localhost
#
# ServerName gives the name and port that the server uses to identify itself.
# This can often be determined automatically, but we recommend you specify
# it explicitly to prevent problems during startup.
#
# If your host doesn't have a registered DNS name, enter its IP address here.
#
#ServerName www.example.com:80
#
# Deny access to the entirety of your server's filesystem. You must
# explicitly permit access to web content directories in other
# <Directory> blocks below.
#
<Directory />
AllowOverride none
Require all denied
</Directory>
#
# Note that from this point forward you must specifically allow
# particular features to be enabled - so if something's not working as
# you might expect, make sure that you have specifically enabled it
# below.
#
#
# DocumentRoot: The directory out of which you will serve your
# documents. By default, all requests are taken from this directory, but
# symbolic links and aliases may be used to point to other locations.
#
DocumentRoot "/var/www/html"
#
# Relax access to content within /var/www.
#
<Directory "/var/www">
AllowOverride None
# Allow open access:
Require all granted
</Directory>
# Further relax access to the default document root:
<Directory "/var/www/html">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important. Please see
# http://httpd.apache.org/docs/2.4/mod/core.html#options
# for more information.
#
Options Indexes FollowSymLinks
#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# Options FileInfo AuthConfig Limit
#
AllowOverride None
#
# Controls who can get stuff from this server.
#
Require all granted
</Directory>
#
# DirectoryIndex: sets the file that Apache will serve if a directory
# is requested.
#
<IfModule dir_module>
DirectoryIndex index.html
</IfModule>
#
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<Files ".ht*">
Require all denied
</Files>
#
# ErrorLog: The location of the error log file.
# If you do not specify an ErrorLog directive within a <VirtualHost>
# container, error messages relating to that virtual host will be
# logged here. If you *do* define an error logfile for a <VirtualHost>
# container, that host's errors will be logged there and not here.
#
ErrorLog "logs/error_log"
#
# LogLevel: Control the number of messages logged to the error_log.
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
#
LogLevel warn
<IfModule log_config_module>
#
# The following directives define some format nicknames for use with
# a CustomLog directive (see below).
#
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
\"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
<IfModule logio_module>
# You need to enable mod_logio.c to use %I and %O
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
\"%{User-Agent}i\" %I %O" combinedio
</IfModule>
#
# The location and format of the access logfile (Common Logfile Format).
# If you do not define any access logfiles within a <VirtualHost>
# container, they will be logged here. Contrariwise, if you *do*
# define per-<VirtualHost> access logfiles, transactions will be
# logged therein and *not* in this file.
#
#CustomLog "logs/access_log" common
#
# If you prefer a logfile with access, agent, and referer information
# (Combined Logfile Format) you can use the following directive.
#
CustomLog "logs/access_log" combined
</IfModule>
<IfModule alias_module>
#
# Redirect: Allows you to tell clients about documents that used to
# exist in your server's namespace, but do not anymore. The client
# will make a new request for the document at its new location.
# Example:
# Redirect permanent /foo http://www.example.com/bar
#
# Alias: Maps web paths into filesystem paths and is used to
# access content that does not live under the DocumentRoot.
# Example:
# Alias /webpath /full/filesystem/path
#
# If you include a trailing / on /webpath then the server will
# require it to be present in the URL. You will also likely
# need to provide a <Directory> section to allow access to
# the filesystem path.
#
# ScriptAlias: This controls which directories contain server scripts.
# ScriptAliases are essentially the same as Aliases, except that
# documents in the target directory are treated as applications and
# run by the server when requested rather than as documents sent to the
# client. The same rules about trailing "/" apply to ScriptAlias
# directives as to Alias.
#
ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"
</IfModule>
#
# "/var/www/cgi-bin" should be changed to whatever your ScriptAliased
# CGI directory exists, if you have that configured.
#
<Directory "/var/www/cgi-bin">
AllowOverride None
Options None
Require all granted
</Directory>
<IfModule mime_module>
#
# TypesConfig points to the file containing the list of mappings from
# filename extension to MIME-type.
#
TypesConfig /etc/mime.types
#
# AddType allows you to add to or override the MIME configuration
# file specified in TypesConfig for specific file types.
#
#AddType application/x-gzip .tgz
#
# AddEncoding allows you to have certain browsers uncompress
# information on the fly. Note: Not all browsers support this.
#
#AddEncoding x-compress .Z
#AddEncoding x-gzip .gz .tgz
#
# If the AddEncoding directives above are commented-out, then you
# probably should define those extensions to indicate media types:
#
AddType application/x-compress .Z
AddType application/x-gzip .gz .tgz
#
# AddHandler allows you to map certain file extensions to "handlers":
# actions unrelated to filetype. These can be either built into the server
# or added with the Action directive (see below)
#
# To use CGI scripts outside of ScriptAliased directories:
# (You will also need to add "ExecCGI" to the "Options" directive.)
#
#AddHandler cgi-script .cgi
# For type maps (negotiated resources):
#AddHandler type-map var
#
# Filters allow you to process content before it is sent to the client.
#
# To parse .shtml files for server-side includes (SSI):
# (You will also need to add "Includes" to the "Options" directive.)
#
AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
</IfModule>
#
# Specify a default charset for all content served; this enables
# interpretation of all content as UTF-8 by default. To use the
# default browser choice (ISO-8859-1), or to allow the META tags
# in HTML content to override this choice, comment out this
# directive:
#
AddDefaultCharset UTF-8
<IfModule mime_magic_module>
#
# The mod_mime_magic module allows the server to use various hints from the
# contents of the file itself to determine its type. The MIMEMagicFile
# directive tells the module where the hint definitions are located.
#
MIMEMagicFile conf/magic
</IfModule>
#
# Customizable error responses come in three flavors:
# 1) plain text 2) local redirects 3) external redirects
#
# Some examples:
#ErrorDocument 500 "The server made a boo boo."
#ErrorDocument 404 /missing.html
#ErrorDocument 404 "/cgi-bin/missing_handler.pl"
#ErrorDocument 402 http://www.example.com/subscription_info.html
#
#
# EnableMMAP and EnableSendfile: On systems that support it,
# memory-mapping or the sendfile syscall may be used to deliver
# files. This usually improves server performance, but must
# be turned off when serving from networked-mounted
# filesystems or if support for these functions is otherwise
# broken on your system.
# Defaults if commented: EnableMMAP On, EnableSendfile Off
#
#EnableMMAP off
EnableSendfile on
# Supplemental configuration
#
# Load config files in the "/etc/httpd/conf.d" directory, if any.
IncludeOptional conf.d/*.conf
<IfModule mpm_event_module>
ThreadsPerChild 25
StartServers 3
ServerLimit 120
MinSpareThreads 75
MaxSpareThreads 3000
MaxRequestWorkers 3000
MaxConnectionsPerChild 0
</IfModule>
```
Mateusz Kempski
On Mon, 22 May 2023 at 11:04, Yann Ylavic <ylavic.dev@xxxxxxxxx> wrote:
>
> Hi,
>
> On Mon, May 22, 2023 at 12:19 PM Mateusz Kempski
> <mkempski@xxxxxxxxxxxx.invalid> wrote:
> >
> > Then I added following options
> > to default config on both servers:
> > ```
> > <IfModule mpm_event_module>
> > ThreadsPerChild 25
> > StartServers 3
> > ServerLimit 120
> > MinSpareThreads 75
> > MaxSpareThreads 3000
> > MaxRequestWorkers 3000
> > MaxConnectionsPerChild 0
> > </IfModule>
> > ```
>
> What is the difference between the two configurations (besides
> identical MPM parameters)? Things like EnableMMAP and EnableSendfile
> matter too for instance.
>
> Do the two systems have the same `ulimit -n` (or LimitNOFILE in
> systemd) for httpd?
>
> Also, do you see errors in the error_log file? Maybe "LogLevel
> mpm_event:trace1" could help see what happens while not being too
> verbose.
>
>
> Regards;
> Yann.
>
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