No space left on device: mod_jk: could not create jk_log_lock

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I got this error while working on Apache.
[crit] (28)No space left on device: mod_jk: could not create jk_log_lock
Configuration Failed

It was due to the semaphore limitation.
[root@host ~]# ipcs -su
------ Semaphore Status --------
used arrays = 127
allocated semaphores = 127
[root@host~]#

Installing SSL certificate on Apache with Tomcat

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I have an Apache tomcat stack on which Apache is front proxy and tomcat is serving contents. How to install SSL on this scenario? Whether to install ssl on Apache or Install ssl on Tomcat? In my case Apache and tomcat is connected using mode_jk. I installed ssl on apache. Here is the steps how I did. Comment if you know some better methods. Operating system used is Centos 5.4, Apache version is httpd-2.2.3-65.el5.centos and Tomcat tested on 5 and 6.

Check here for Installing and configuring Apache with tomcat using mod_jk
Generating key and csr:
yum install mod_ssl openssl

url redirection in apache using proxypass

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Url redirection in Apache webserver.
Here is a small example of url redirection in Apache using proxypass. I used this when I was using Apache as proxy to Apache tomcat using mod_jk.

Example:
you want to forward
www.yourdomain.come/abc to www.yourdomain.com/linux/commands/abc