Category: Webservers

Determine Apache Built In Modules

August 26, 2005

How can one determine what modules have been compiled into an Apache install? From the command line type:

/usr/local/apache2/bin/httpd -l

1	/usr/local/apache2/bin/httpd -l

You’ll get results similar to this:


Compiled in modules:
  core.c
  mod_access.c
  mod_auth.c
  mod_include.c
  mod_log_config.c
  mod_env.c
  mod_setenvif.c
  prefork.c
  http_core.c
  mod_mime.c
  mod_status.c
  mod_autoindex.c
  mod_asis.c
  mod_cgi.c
  mod_negotiation.c
  mod_dir.c
  mod_imap.c
  mod_actions.c
  mod_userdir.c
  mod_alias.c
  mod_so.c

Compiled in modules:

core.c

mod_access.c

mod_auth.c

mod_include.c

mod_log_config.c

mod_env.c

mod_setenvif.c

prefork.c

http_core.c

mod_mime.c

mod_status.c

mod_autoindex.c

mod_asis.c

mod_cgi.c

mod_negotiation.c

mod_dir.c

mod_imap.c

mod_actions.c

mod_userdir.c

mod_alias.c

mod_so.c

Determine Apache Version

August 26, 2005

How can one determine the version of Apache webserver installed on a system? From the command line type:

/usr/local/apache2/bin/httpd -v

1	/usr/local/apache2/bin/httpd -v

You’ll get results similar to this:

Server version: Apache/2.0.54
Server built:   Aug 22 2005 06:27:29

1 2	Server version: Apache/2.0.54 Server built: Aug 22 2005 06:27:29

So in this case the version is 2.0.54. You can get similar information by requesting a non-existent page from the server with your web browser. The server version will be displayed at the end of the error message.

OpenNMS Install

March 4, 2005

OpenNMS is a great network monitoring tool. Here’s the OpenNMS site: http://www.opennms.org In this case I’m going to do an install on to a RedHat Fedora Core 1 server. Here’s the installation guide: https://sourceforge.net/docman/display_doc.php?docid=23937&group_id=4141 The first step is to install the various prerequisites: – Java 2 SDK 1.4.2 or later from http://java.sun.com We did a stock install of the 1.4.2_07 tar/gz package to /usr/local/. Don’t forget to export the JAVA_HOME environment variable:

export JAVA_HOME=/usr/local/j2sdk1.4.2_07/

1	export JAVA_HOME=/usr/local/j2sdk1.4.2_07/

– Tomcat 4 from http://jakarta.apache.org/tomcat/index.html We did a standard install of the 4.1.31 tar/gz package following the instructions here: http://jakarta.apache.org/tomcat/tomcat-4.1-doc/RUNNING.txt The install was placed at /usr/local/jakarta-tomcat-4.0. We added the following lines to /etc/rc.local to start Tomcat on bootup and open the appropriate firewall ports:


   # tomcat startup
   export JAVA_HOME=/usr/local/j2sdk1.4.2_07
   export CATALINA_HOME=/usr/local/jakarta-tomcat-4.0
   $CATALINA_HOME/bin/startup.sh
   iptables -A INPUT -p tcp --dport 8080 -j ACCEPT

# tomcat startup

export JAVA_HOME=/usr/local/j2sdk1.4.2_07

export CATALINA_HOME=/usr/local/jakarta-tomcat-4.0

$CATALINA_HOME/bin/startup.sh

iptables -A INPUT -p tcp --dport 8080 -j ACCEPT

At this point Tomcat was accessible at http://{myipaddress}:8080 – RRDTool from http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/ We used the 1.0.49 source tar/gz package and built it using the instructions in the enclosed README file. The package

View Contents Of SSL Certificate

February 23, 2005

When you renew an SSL certificate, you have to create a new Certificate Signing Request (CSR) with the same information as the original certificate. To get this information there are several options: 1. If the certificate authority (CA) is Verisign then you can search for the certificate on there support website and view the contents. You’ll need to know the exact domain name that was used to generate the certificate. 2. If you have the original CSR then you can use the following command to view the contents:


openssl req -noout -text -in domainname.csr

openssl req -noout -text -in domainname.csr

3. If you have the original certificate the you can use this command to view it’s contents:


openssl x509 -noout -text -in server.crt

openssl x509 -noout -text -in server.crt

Other usefull commands include: a. Show contents of private key:


openssl rsa -noout -text -in domainname.key

openssl rsa -noout -text -in domainname.key

b. Generate a key and csr:


openssl genrsa -des3 -out domainname.key 1024
openssl req -new -key domainname.key -out domainname.csr

openssl genrsa -des3 -out domainname.key 1024

openssl req -new -key domainname.key -out domainname.csr

Redhat Network Config Resources

January 8, 2005

Here are some handy references about network config on redhat: /usr/share/doc/initscripts-<version>/sysconfig.txt — A guide to available options for network configuration files, including IPv6 options not covered in this chapter. /usr/share/doc/iproute-<version>/ip-cref.ps — This file contains a wealth of information about the ip command, which can be used to manipulate routing tables, among other things. Use the ggv or kghostview application to view this file. http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/ref-guide/ch-networkscripts.html