KEMP Technologies Frequently Asked Questions

How much content can be cached on a LoadMaster?

LoadMaster can cache static content that fits certain criteria (file extension, query string, caching headers, size, etc.) — as long as the file meets these criteria it can be stored locally to LoadMaster to avoid unnecessary requests to the real server to retrieve the file. The maximum caching size is 20% of the total RAM in the LoadMaster.

We don't currently partner with any other products to extend caching functionality.

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How to Enable SNMP on the KEMP LoadMaster

To enable SNMP or Simple network management protocol which can be used to monitor the load master unit e.g. CPU load and statistics on the load master.

  1. Select System Configuration – Logging Options – SNMP Options
  2. Select enable SNMP
  3. To add SNMP client name input the IP or hostname of the SNMP server
  4. Next added the community string which can be either public if open to all or private string name.
  5. The contact name is related to the username of the contact person who has the management information e.g. “KEMP Support”
  6. The location is related to the device location for example “Ireland” Enable SNMP traps: When enabled this will display the options for Sink1 and Sink2, Sink 1 is related to SNMP v1 and Sink 2 is related to SNMPv2.

These options allow the user to specify a list of hosts to which a SNMPv1 or v2 trap will be sent when a trap is created.

How do I know what processes are using CPU on my KEMP LoadMaster?

To capture all the running processes running on the load masters a PS command can be run. A PS will display the PPID’s of the processes running on the load master.

  1. Go to System Configuration – Logging Options – Log Files.
  2. Select Debug Options and select Perform a PS and select PS button.

A new page will be displayed with the data from the PS.

Add port 80 redirect

You can enable a port 80 redirect for a HTTPS virtual service.

  1. Select Virtual Services – View Modify Service.
  2. Select the Https service for port 443 and select modify.
  3. Under the virtual service select Advanced Properties and select Add HTTP Redirector under Add a Port 80 Redirector VS
  4. This will redirect traffic received on port 80 to the https 443 virtual services running on the load master.

Enable L7 transparency

How to enable L7 transparency so real servers can sees all the client IP addresses in their logs.

  • To enable L7 transparency
    1. Select Virtual Service and go to View/Modify Service
    2. Select Modify on Virtual services and go to standard options
    3. Select enable on L7 transparency
  • To enable L7 transparency need to make two changes to their set up as follows.
    1. Clients IP addresses needs to be on a different IP subnet compared to the real servers.
    2. Change the real servers default gateway to the IP address of the loadmasters or if set up in HA pair the Shared IP address of the Loadmaster.
  • When these changes are made real servers will see the client IP addresses.

Automated backup

To perform automated backup. Firstly set up a FTP server and create a user account for on the FTP server.

Steps to access automated backup feature

  1. Select Systems Configuration – Systems Administration – Backup/Restore 2. Click Enable Automated Backups
  2. Select the time to perform the backup which can be Daily or on a set day of the week.
  3. Input FTP username and password
  4. Remote IP address which is the IP address of their FTP server.
  5. Remote Pathname specify the remote path on the FTP server - Optional.
  6. The backup will be performed at the selected time.

Update firmware.

Firstly find out what is the currently version of firmware that is loaded on your loadmaster select home on your loadmaster. Under loadmaster version this will show the current version of firmware that is installed e.g. 6.0-34.20120518-1448. Next forward this information with details on the loadmaster serial number and model version to emeasupport@kemptechnologies.com and the support team will confirm the latest version of firmware for your model. Prior to updating the Loadmaster firmware, please ensure the configuration and SSL certs have been backed up.

  1. Select System Configuration – Systems Administration – Update Software.
  2. Select choose File and select the update file for the latest firmware version.
  3. Select Update machine. The update will take about five minutes.
  4. Next select Rebooting Now.
  5. The LM will update to latest version of the load master

After reboot to confirm the loadmaster has been upgraded to the latest firmware select Home on the loadmaster and confirm the firmware has been update to the select version

How do I setup a "Sorry Server" on the LM?

The Sorry server option on the LM redirects all traffic to that server if all other real servers on that VS fails the Health check.

  1. Select the Virtual Services option
  2. Click on the View/Modify Services option
  3. Click the Modify button
  4. In the Advanced Properties section
  5. Enter in the IP address of the server in the Sorry Server field.
  6. Click on the Set Server Address button.
Once this is applied, Traffic will flow to the real servers added to the VS. If all the real servers fail the health check, it will display Sorry in the View/Modify of VS and all traffic will flow to the Sorry Server. No Health Checking is done on the Sorry Server.

 

For transparency, I have my real servers pointing to my LM. How do I get access to my real servers via RDP?

If you have one-arm setup on your LM, disable your SNAT. This will allow you to access your real servers via RDP.

To disable SNAT, in the WUI

  1. Select the System Configuration > Miscellaneous > Network Configuration option.
  2. Uncheck the Enable SNAT checkbox.

If you have a two-arm setup on your LM, create an RDP VS.

  1. Select the Virtual Services option
  2. Click on the View/Modify Services option
  3. Click the Add New button
  4. Create a VS on port 3389
  5. Add the Real Server that you want to access

From here you will be able to access your real server via RDP

When I reboot my VLM, I cannot get access to my VS or Config and it is asking me for a Licence?

The NIC's on your VLM do not have static MAC addresses applied to them. The KEMP licence is created from the VLM's access code and the access code is based on the hosts MAC address. If the MAC address of the VLM NIC's are changed, this will change the Access code and as a result the Loadmaster License will be invalid.

To resolve this issue depending on the platform that you are using (VMware, Hyper-v, etc.), the MAC addresses on your NIC's will have to be set to static. Once this is done, apply for a new licence from KEMP support and apply the licence.

What does the option Switch to Preferred Server do?

This option is used to select a preferred HA unit. This option can be set to either HA1, HA2 or No preferred host (default).

  • When set to HA1, if the LM fails over, the Master will revert back to HA1 when HA1 comes back online
  • When set to HA2, if the LM fails over, the Master will revert back to HA2 when HA2 comes back online
  • When No Preferred host is selected, if there is a failover on the LM, the unit that becomes Master will remain as Master (no failback will happen)

To change this option in the WUI

  1. Select the System configuration > Miscellaneous Options > Ha Parameters option
  2. Select the preferred option in the Switch to Preferred Server dropdown list

What does the HA timeout Value do?

This option determines the amount of time it will take before failover will occur to your Standby unit when your Master becomes unavailable.

Timeout values to choose from are 3s, 6s, 9s, 12s and 15s. The recommended (default) value is 9 seconds.

To select the option in the WUI:

  1. Select the System Configuration > Miscellaneous Options > HA Parameters option
  2. Select the preferred value in the HA Timeout dropdown list.

Can I access the shared WUI on multiple addresses?

Yes, the LM allows you to add additional addresses to access the shared IP WUI.

  1. Select the interface which is configured to the shared IP address in the System Configuration > Interfaces menu and in the Additional addresses field enter in the extra addresses and select Add Address.
  2. Once this is complete, you will be able to access the shared IP address on the additional address entered.

Where can I find my serial number/Machine ID?

Your serial number/Machine ID is displayed by selecting the Home menu option.

How do I upload my configuration from my Master unit to my Slave unit?

  1. Log into the WUI of your Master unit
  2. Select the System Configuration > System Administration > Backup/Restore menu option
  3. Click on the Create Backup File button
  4. Save the file.
  5. Log into the WUI of your Slave unit
  6. Select the System Configuration > System Administration > Backup/Restore menu option
  7. Click on the Browse button and select the Master Backup file
  8. Select both the Load Master Base Configuration and VS Configuration check boxes.
  9. Click on the Restore Configuration button

This will apply the same configuration on both units

When setting up my scheduling method to adaptive agent, is the any requirements needed in-order for this to work?

  • One requirement is that you will have to run a web service on the server. Whether IIS, apache, etc., you will need a web service running on the server in-order to run adaptive agent.
  • There is a list of steps to configure this feature on your server and you can find these setting and documentation at: http://www.kemptechnologies.com/documentation

How do I setup my Auto-Backup on my LM?

To enable Auto-Backup:

  1. Click System Configuration>System Administration>Backup/Restore>Enable Automated Backups
  2. Select the time of which to perform the backup and select which day or a daily option and set Backup time
  3. Set the user name for ftp server in the remote user and select Set Remote User
  4. Also set the remote password for ftp server and select Set Remote Password
  5. Enter in the IP address of the FTP server and select Set Remote Host
  6. There is also an option to set a certain directory where the backup host file will be stored, enter in the remote pathname and select Remote Pathname

Once this is completed, the Backup files will be stored in this directory.

I have a single LM unit and I just bought another single LM unit, how do I set up my units as a Ha-Pair?

Under the WUI, on your single unit that is already configured:

  1. In the System Configuration > Miscellaneous Option > HA Parameters > Select HA (First) Mode section select Yes.
  2. In the System Configuration > eth0 interface section:
  3. Enter in the shared IP address and click Set address
  4. Enter in the partner IP address and click Set address
  5. Reboot this unit.

This unit will now become HA-1.

 

On your new single unit, connect the VGA monitor and keyboard to your unit. Under the console menu, follow the setup guide on setting up the LM and enter in the physical IP address, LM name and default gateway of the unit. Then reboot the unit. Once the unit has rebooted, log onto the physical IP address of the unit in the web browser:

  1. In the WUI, go to System Configuration > Miscellaneous Option > HA Parameters > Select HA (Second mode) Mode section and select Yes
  2. In the System Configuration > eth0 interface section:
  3. Enter in the shared IP address and click Set address
  4. Enter in the partner IP address and click Set address
  5. Reboot this unit.

This unit will now become HA-2.

The HA-pair is now set up and settings/configuration can be viewed and/or modified in the shared (management) IP address

How do I get my LM error messages sent to my email?

This option sends all error messages of the LM to your email address. Here are the following steps:

  1. In the System Configuration > System Administration > Logging Options > Email Options section select Enable Email Logging
  2. Enter in the IP address/FQND of the SMTP server in the SMTP Server field and click Set Server
  3. Enter in the username of your SMTP server in the Server Authorization (Username) field, if you have an authorization setup on your server
  4. Enter in the password of your SMTP server in the Authorization Password field, if you have an authorization setup on your server
  5. Enter in the top-level domain if the SMTP server in the Local Domain field if it is part of a domain
  6. Select the type of connection security form the Connection Security drop-down, selecting either STARTTLS or SSL/TLS.
  7. Finally, there are a number of different levels of alerts, ranging from normal Info to Critical/Emergency errors. Enter in the email address that correspond with the level desired. Multiple email address can be entered in the levels by putting a comma and space between both addresses.

Once this is complete, all notifications of error messages will be sent to that email address

What is a simple way to redirect my http traffic to https?

  1. Create a 443 VS and add your Real Servers
  2. In the 'Advanced Properties' of your '443 VS' in the 'Not Available Redirection Handling' section, select the 'Select 302 Found' option in the 'Error Code' drop-down list.
  3. Specify the URL you want to redirect to and select 'Set Redirect URL'. This will create automatic port 80 Redirect VS.

Here is some example URLs, for the URL %h defines host name and %s defines the URI

Once this is set, any traffic that comes in over http, will be redirected over https.