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Managing server resources efficiently is essential for maintaining performance and stability. If a particular domain or directory is consuming excessive bandwidth, you can control its usage using the mod_bw module in Apache.

The mod_bw (bandwidth module) allows administrators to restrict bandwidth usage and limit the number of simultaneous connections for specific virtual hosts (vhosts) or directories. This is especially useful in shared hosting environments where resource control is critical.

When to Use mod_bw

You can use mod_bw when:

• A domain is consuming high bandwidth
• Want to limit download speeds for files
• Need to restrict simultaneous connections
• Want better control over server resource usage

Steps to Install and Configure mod_bw

1. Check Apache Version

Run the following command to verify your Apache version:

/usr/local/apache/bin/httpd -v

2. Download the mod_bw Module

cd /usr/src
wget http://ivn.cl/files/source/mod_bw-0.92.tgz

3. Extract the Package

tar -zxf mod_bw-0.92.tgz
cd mod_bw

4. Review Configuration Instructions

cat mod_bw.txt | more

5. Install the Module

/usr/local/apache/bin/apxs -i -a -c mod_bw.c

6. Create Configuration File

cat mod_bw.txt | perl -pe 's:^:# :g' > /usr/local/apache/conf/mod_bw.conf

7. Verify Module Configuration

Edit the file:

/usr/local/apache/conf/mod_bw.conf

Ensure the following entries are enabled:

LoadModule bw_module modules/mod_bw.so<Location /modbw>
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
    SetHandler modbw-handler
</Location>

8. Update Apache Main Configuration

Open:

/usr/local/apache/conf/httpd.conf

Make sure these lines are present and enabled:

LoadModule bwlimited_module modules/mod_bwlimited.so
Include "/usr/local/apache/conf/mod_bw.conf"

9. Add Configuration to Domain (vhost)

In the Apache configuration, include mod_bw settings for the specific domain:

Include "/usr/local/apache/conf/userdata/std/2/username/domainname.com/mod_bw.conf"

10. Configure Bandwidth Limits

Create or edit the file:

/usr/local/apache/conf/userdata/std/2/username/domainname.com/mod_bw.conf

Add the following configuration:

BandwidthModule On
ForceBandWidthModule On
Bandwidth all 100000
MinBandwidth all -1

Explanation:

• Bandwidth all 100000 → Limits bandwidth to ~100 KB/s
• MinBandwidth all -1 → No minimum bandwidth restriction

11. Restart Apache

Apply the changes by restarting Apache:

/etc/init.d/httpd graceful

Conclusion

Using mod_bw in Apache is an effective way to control bandwidth usage and limit connections for specific domains or directories. By implementing these configurations, you can prevent resource abuse, improve server performance, and ensure fair usage across hosted applications.

For optimal results, always monitor your server after applying limits and adjust the configuration based on your requirements.

If you require help, contact SupportPRO