Apache: Difference between revisions

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=HOWTO=
==Log SSL protocols==
CustomLog logs/ssl_request_log "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"






= FAQ =
= FAQ =
==Modules==
== Enable module ==
===On Debian===
a2enmod
===On RedHat===


== AH01630: client denied by server configuration ==
=== List active modules===
 
apachectl -t -D DUMP_MODULES
Probably using 2.2 config on 2.4, change


Order allow,deny
Allow from all


to
==Enable HSTS==
a2enmod headers
and in config
Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"


Require all granted


== [core:emerg] [pid 3317] (28)No space left on device: AH00023: Couldn't create the rewrite-map mutex ==
== [core:emerg] [pid 3317] (28)No space left on device: AH00023: Couldn't create the rewrite-map mutex ==
Line 94: Line 100:
==Check which MPM is running ( prefork or worker) ==
==Check which MPM is running ( prefork or worker) ==
  httpd -V | grep MPM
  httpd -V | grep MPM
 
or more modern
apache2ctl -t -D DUMP_MODULES | grep mpm


== NameVirtualHost *:80 has no VirtualHosts ==
== NameVirtualHost *:80 has no VirtualHosts ==
Line 226: Line 233:
  Redirect permanent / [https://foo.com https://foo.com]
  Redirect permanent / [https://foo.com https://foo.com]


*[http://www.whoopis.com/howtos/apache-rewrite.html http://www.whoopis.com/howtos/apache-rewrite.html]
*[https://httpd.apache.org/docs/current/rewrite/avoid.html#redirect Use redirect instead of rewrite]
 
 


== debugging rewrites ==
== debugging rewrites ==
Line 244: Line 249:
 
 


== AH00179: changing ServerLimit to 700 from original value of 512 not allowed during restart ==
 
 
 
== server-status: ERROR 500: Internal Server Error==
??
 
 
==Error messages==
=== AH00162: server seems busy ===
 
maybe it's busy
 
 
=== AH01630: client denied by server configuration ===
 
Probably using 2.2 config on 2.4, change
 
Order allow,deny
Allow from all
 
to
 
Require all granted
 
=== AH00179: changing ServerLimit to 700 from original value of 512 not allowed during restart ===


Needs a real restart
Needs a real restart


== AH00162: server seems busy ==
===AH02282: No slotmem from mod_heartmonitor===


maybe it's busy
??

Latest revision as of 13:55, 9 August 2024

From the apache homepage:

The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.

Links

Documentation
http://httpd.apache.org/ Apache homepage
http://httpd.apache.org/docs/2.2/ 2.2 Reference
http://httpd.apache.org/docs/2.0/ 2.0 Reference
http://httpd.apache.org/docs/1.3/ 1.3 Reference
Apache and SSL
Apache2, Debian and SSL
More Apache and SSL
Articles
vhosts explained "Simplify Your Life with Apache Virtual Hosts" Russell Dyer 07/24/2003
Tools
http://awstats.sourceforge.net/ Apache log analyzer

Documentation

Virtual hosts

Application & modules

Log analyzers


Notes

  • Don't use the CGI to present the data unless it is protected. Best use awstats_buildstaticpages.pl to build the static pages and present those. Save resources and is more secure.

Related Items

Web-based Single Sign-On

Applications

Comparisons


HOWTO

Log SSL protocols

CustomLog logs/ssl_request_log "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"


FAQ

Modules

Enable module

On Debian

a2enmod

On RedHat

List active modules

apachectl -t -D DUMP_MODULES


Enable HSTS

a2enmod headers

and in config 

Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains"


[core:emerg] [pid 3317] (28)No space left on device: AH00023: Couldn't create the rewrite-map mutex

Check 

ipcs -s

 

Check which MPM is running ( prefork or worker)

httpd -V | grep MPM

or more modern 

apache2ctl -t -D DUMP_MODULES | grep mpm

NameVirtualHost *:80 has no VirtualHosts

This means you're using <VirtualHost *> instead of <VirtualHost *:80> Or you have multiple declarations of NameVirtualHost *:80

Telnet session to webserver

telnet www.example.com 80
get / HTTP/1.1
<enter>
<enter>

For a virtual also pass host: 

get / HTTP/1.1
host: virtual.host.com
<enter>

 

Apache memory usage

ps aux|grep http|awk '{sum+=$4} END {print sum}'

 

Authentication

Read:

In .htaccess or </Directory> section put: 

Authtype Basic
AuthUserFile /etc/apache/htusers
Require valid-user
AuthName "Protected"

Hide directories

RedirectMatch 404 /\.svn(/|$)

or 

<DirectoryMatch "^/.*/\.git/">
 Require all denied
</DirectoryMatch>

Deny access to files

<FilesMatch \.(?i:gif|jpe?g|png)$>
 Require all denied
</FilesMatch>


 

Strange hang and not restarting

ipcs -s|grep apache
for i in `ipcs -s|grep apache|awk {'print $2'}`;do ipcrm sem $i;done;

Get core dumps

In apache configuration: 

 CoreDumpDirectory /tmp/apache2-gdb-dump (make sure to have proper rights)

On freebsd

Set apache22limits_enable="YES in /etc/rc.conf

In apache configuration: 

 CoreDumpDirectory /tmp/apache2-gdb-dump (make sure to have proper rights)

Other stuff to try 

sysctl kern.sugid_coredump=1
sysctl kern.coredumps=1

On Debian

sysctl fs.suid_dumpable=2 ?
ulimit -c unlimited ?

Socket is not connected: core_output_filter: writing data to the network

Bug in some versions?

Connection refused: connect to listener on 0.0.0.0:80

Seems a jail problem, try setting 

Listen 12.33.44.55:80

 

No such file or directory: Failed to enable the 'httpready' Accept Filter

In /boot/loader.conf 

accf_data_load="YES"
accf_http_load="YES"

 

sorting apache logs

http://jehiah.cz/archive/sorting-apache-logs

 

unable to include potential exec

Rewriting and redirecting

http://www.aitechsolutions.net/apacheredirect.html

redirect http to https

#this usually does the trick
Redirect permanent / https://foo.com

debugging rewrites

status codes

 

client denied by server configuration

That's the Deny/Allow bits in config

 



server-status: ERROR 500: Internal Server Error

??


Error messages

AH00162: server seems busy

maybe it's busy


AH01630: client denied by server configuration

Probably using 2.2 config on 2.4, change 

Order allow,deny
Allow from all

to 

Require all granted

AH00179: changing ServerLimit to 700 from original value of 512 not allowed during restart

Needs a real restart

AH02282: No slotmem from mod_heartmonitor

??

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