Delete Files Older Than X Days on Linux

This Blog is for those who wants to delete files older than X days using single command. The find utility on linux allows you to pass in a bunch of interesting arguments, including one to execute another command on each file. We will use this in order to figure out what files are older than a certain number of days, and then use the rm command to delete them.

Command Syntax

 find /path/to/files* -mtime +7 -exec rm {} \;

Note: that there are spaces between rm, {}, and \;

Explanation

• The first argument is the path to the files. This can be a path, a directory, or a wildcard as in the example above. I would recommend using the full path, and make sure that you run the command without the exec rm to make sure you are getting the right results.
• The second argument, -mtime, is used to specify the number of days old that the file is. If you enter +5, it will find files older than 5 days.
• The third argument, -exec, allows you to pass in a command such as rm. The {} \; at the end is required to end the command.

This should work on Redhat, CentOS, Ubuntu, Suse or pretty much any version of Linux.

SSH is slow to make a connection

I just installed RHEL 6.2, and whenever I try to SSH into my servers it's very slow. Before it displays the password prompt, it can take between 40 seconds and 60 seconds.

I found the solution of it.
This is slow because the OpenSSH daemon uses DNS to run a reverse lookup on the client hostname to make sure it's valid.

sudo vi /etc/ssh/ssh_config

Comment out the following lines 

#GSSAPIAuthentication yes
#GSSAPIDelegateCredentials no

OR

add this:

UseDNS no

Restart sshd deamon 

 

Alfresco Authentication Subsystems LDAP Authentication Chain

Alfresco 3.2 and later has the concept of subsystems.
Here I am describing the LDAP Authentication Chain.
How to configure more than one LDAP Authentication in Alfresco Authentication Chain subsystems.


Example:
Environment I used is Linux


Edit your alfresco-global.properties file and add



authentication.chain=ldap1:ldap,ldap2:ldap

Create Folder
Go to Folder

$TOMCAT_HOME/shared/classes/alfresco/extension/

mkdir -p subsystems/Authentication/ldap/ldap1 mkdir -p subsystems/Authentication/ldap/ldap2

Then copy  

$TOMCAT_HOME/webapps/alfresco/WEB-INF/classes/alfresco/subsystems/Authentication/ldap/ldap-authentication.properties

To 

$TOMCAT_HOME/webapps/alfresco/WEB-INF/classes/alfresco/subsystems/Authentication/ldap/ldap-authentication.properties

and

$TOMCAT_HOME/shared/classes/alfresco/extension/subsystems/Authentication/ldap/ldap1/ldap-authentication.properties

You can then edit the properties for ldap1 and ldap2 as required to complete the configuration. 

Apache mod_rewrite and examples

What is mod_rewrite? Mod Rewrite allows you to change the URL that everyone sees when they visit your domain or a specific address. Just add the code to your .htaccess file or in Virtual Host area.

EXAMPLES

#Specify a default home page (index page) DirectoryIndex home.html

#Allow only specified IPs to access your site deny from all allow from 64.95.219.140 allow from 210.23.45.67

# Redirect all pages from olddomain.com # to newdomain.com Options +FollowSymLinks RewriteEngine on RewriteCond %{HTTP_HOST} ^www.olddomain.com$ [OR] RewriteCond %{HTTP_HOST} ^olddomain.com$ RewriteRule ^(.*)$ http://www.newdomain.com/$1 [R=301,L]

# Block traffic from multiple referrers RewriteEngine on Options +FollowSymlinks RewriteCond %{HTTP_REFERER} badsite\.com [NC,OR] RewriteCond %{HTTP_REFERER} badforum\.com [NC,OR] RewriteCond %{HTTP_REFERER} badsearchengine\.com [NC] RewriteRule .* - [F] #Do not allow these file types to be called RewriteEngine on RewriteRule .*\.(jpg|jpeg|gif|png|bmp|exe|swf)$ - [F,NC]

#Prevent subfolder loading. This goes # in htaccess for the primary domain RewriteCond %{HTTP_HOST} ^primary\.com$ [OR] RewriteCond %{HTTP_HOST} ^www\.primary\.com$ RewriteRule ^addon\.com\/?(.*)$ "http\:\/\/www\.addon\.com\/$1" [R=301,L]

# Never use www in the domain # Replace 'example.com' with your domain name RewriteEngine on RewriteCond %{HTTP_HOST} ^www\.(([a-z0-9_]+\.)?example\.com)$ [NC] RewriteRule .? http://%1%{REQUEST_URI} [R=301,L]

#Prevent subdomain name loading. #This goes in htaccess for the primary domain RewriteCond %{HTTP_HOST} ^subname\.primary\.com$ [OR] RewriteCond %{HTTP_HOST} ^www\.subname\.primary\.com$ RewriteRule ^(.*)$ "http\:\/\/www\.addon\.com\/$1" [R=301,L]

# Always use www in the domain # Replace 'example.com' with your domain name RewriteEngine on RewriteCond %{HTTP_HOST} ^([a-z.]+)?example\.com$ [NC] RewriteCond %{HTTP_HOST} !^www\. [NC] RewriteRule .? http://www.%1example.com%{REQUEST_URI} [R=301,L]

# Set a default home directory, (this subfolder always loads) # Replace 'folder' with your subfolder name <IfModule mod_rewrite.c> RewriteEngine On RewriteRule ^$ /folder/ [R=301,L] </IfModule>

# Rename a directory and force visitors to the new name # Replace 'old' with your old folder name # Replace 'new' with your new folder name RewriteEngine on RewriteRule ^/?old([a-z/.]*)$ /new$1 [R=301,L]

# Always use https for secure connections # Replace 'www.example.com' with your domain name # (as it appears on your SSL certificate) RewriteEngine On RewriteCond %{SERVER_PORT} 100 RewriteRule ^(.*)$ https://www.example.com/$1 [R=301,L]