Summary of Contents for Kemp High Availability
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Page 1: High Availability
High Availability (HA) Feature Description High Availability (HA) Feature Description VERSION: 1.7 UPDATED: JUNE 2014 Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 1 / 37... - Page 2 Users of the information in this document acknowledge that KEMP Technologies cannot be held liable for any loss, injury or damage of any kind, present or prospective, including without limitation any direct, special, incidental or consequential damages (including without...
- Page 3 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. Used, under license, U.S. Patent Nos. 6,473,802, 6,374,300, 8,392,563, 8,103,770, 7,831,712, 7,606,912, 7,346,695, 7,287,084 and 6,970,933 Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 3 / 37...
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Page 4: Table Of Contents
No Access to WUI on HA1/2 or Shared ................. 28 Nothing Works ........................28 9.10 Issue with Hyper-V and HA on a Pair of VLMs ..............28 Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 4 / 37... - Page 5 Both Units Think That They Are the Master Unit ............28 9.11.2 Two Virtual LoadMasters on Different Hosts ..............30 Replacing HA Units ........................31 References ............................36 Document History ..........................37 Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 5 / 37...
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Page 6: Introduction
IP address for the shared interface. Intended Audience This document is intended to be read by anyone who is interested in learning about the HA feature in the KEMP LoadMaster. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 6 / 37... -
Page 7: Advantages Of High Availability (Ha)
The second (passive) unit monitors the active unit to detect if a failure has occurred Active connections and sessions are not lost when a fail-over occurs Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 7 / 37... -
Page 8: Prerequisites
Multicast traffic flow is required in both directions between the devices The appropriate LoadMaster license should be in place Three IP addresses are required for each subnet in which the LoadMaster is configured Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 8 / 37... -
Page 9: Ha Components
LoadMaster up-to-date with changes made to Virtual Services and all other configurations. Notable exceptions that are not synchronized are; time and passwords Keeps the standby LoadMaster updated on persistence updates Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 9 / 37... -
Page 10: Setting Up Ha
Figure 5-3: Shared IP address reminder 5. Click OK on the resulting message reminding not to forget to set the Shared IP address. Figure 5-4: HA settings Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 10 / 37... - Page 11 The first or second HA unit can be opened by clicking the relevant status icon. Green and green status colors indicate a properly paired configuration. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 11 / 37...
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Page 12: Set Up The Second Unit
ID text box and click Set Virtual ID. Using the same ID as other HA devices may cause problems. KEMP highly recommends using a higher value than 10, as any other HA device using the same ID could interfere with HA operations. - Page 13 Set Partner address. 10. Click OK on the resulting message. 11. Change any other settings as needed. 12. Click the Reboot Now button. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 13 / 37...
- Page 14 The left IP address is the shared address. The IP address in brackets is the address of the current, active unit. Next to that, the HA version (Carp) is displayed. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 14 / 37...
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Page 15: Enable The "Use For Ha Checks" Option
1. Log in to the IP address of the active unit. 2. In the main menu, click Local Administration. 3. Select System Reboot. Figure 5-14: System Reboot screen 4. Click the Reboot button. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 15 / 37... - Page 16 When HA1 is back online, both HA status icons should be green. The A should have moved into the right green square. This means that the secondary unit is now the active unit. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 16 / 37...
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Page 17: How To Perform A Firmware Update On Ha Pairs
6 How to Perform a Firmware Update on HA Pairs KEMP recommends that firmware updates are performed outside of working hours. This is to ensure there is no interruption to client connectivity. If it has to be done during working hours we suggest that a window of maintenance is put in place. -
Page 18: Ha Disaster Recovery Process (Replacing A Defective Unit)
HA Parameters. Figure 7-1: HA Mode 4. Select the relevant HA Mode (first or second). 5. Click OK. 6. Click OK again. Figure 7-2: Network Interface Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 18 / 37... -
Page 19: Reboot The Active Unit
15. Click OK. 16. Click Continue. It is optional, but KEMP recommends simulating a failover to the newly restored partner to check that everything is working OK. There are two ways to do this, both are detailed in the sections below. -
Page 20: Change The Switch To Preferred Server Option
Figure 7-5: HA Parameters 2. In the Switch to Preferred Server drop-down list, select the relevant option in order to set the new LoadMaster as the preferred master. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 20 / 37... -
Page 21: Ha Wui Options
LoadMaster will think it is a production link and if one of the LoadMasters reboot, the other will fail too. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 21 / 37... -
Page 22: Ha Parameters
(see menus below). Logging into one of the LoadMasters directly is usually reserved for maintenance. Figure 8-2: Direct IP menu Figure 8-3: Shared IP menu Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 22 / 37... - Page 23 LoadMaster through SSH or the console and reboot. Grey Both machines are active, i.e. both are set to master, and something has gone seriously wrong. CALL KEMP Support. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 23 / 37...
- Page 24 KEMP highly recommends using a higher value than 10, as any other HA device using the same ID could interfere with HA operations. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved.
- Page 25 ARPs (used in communicating changes in HA IP addresses to switches) are not allowed. This option is not available in VLMs because they are not physically connected. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 25 / 37...
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Page 26: Troubleshooting
Reboot both of the units via a single IP Ping between the units Confirm the network settings Check the HA settings on both machines Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 26 / 37... -
Page 27: Blue Ha Status Square
LoadMaster. Grey HA Status Square If there is a grey HA status square, call KEMP Technical Support. Virtual Services Temporarily Unavailable After Failover If Virtual Services are temporarily unavailable after a failover, try flushing the ARP cache on the Layer 3 device. -
Page 28: No Access To Wui On Ha1/2 Or Shared
This issue could be caused by the VMware Switch configuration. To resolve this issue, select the options as outlined below on the virtual switch. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 28 / 37... - Page 29 Figure 9-4: Unit 1 Figure 9-5: Unit 2 The units should now be able to communicate properly. The correct state should now appear in the HA status icons. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 29 / 37...
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Page 30: Two Virtual Loadmasters On Different Hosts
Having two Virtual LoadMasters on different hosts can also pose problems on VMware. Figure 9-6: Properties To resolve these issues, select the Notify Switches check box in the NIC Teaming tab of the virtual switch. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 30 / 37... -
Page 31: Replacing Ha Units
Specifying a preferred host means that when the machine restarts, the preferred unit always becomes master and the partner will revert to slave mode. This may cause connection loss. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 31 / 37... - Page 32 16. Check that the Interface Address (address[/prefix]), the HA Shared IP address and HA Partner IP address are correct before adding it to the production unit. 17. In the main menu, go to Local Administration > HA Parameters. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 32 / 37...
- Page 33 22. Select Prefer Second HA in the Switch to Preferred Server drop-down list. This will drop all connections while the second unit takes over as master. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 33 / 37...
- Page 34 29. Click Reboot Now. 30. Click Continue. 31. In the main menu, go to Local Administration > Interfaces. 32. Select the relevant interface. Figure 10-9: Network Interface Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 34 / 37...
- Page 35 Old unit 1 (A) Old unit 2 (B) If you were replacing faulty units, ensure to send the old faulty units back to KEMP for testing. Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 35 / 37...
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Page 36: References
Unless otherwise specified, the following documents can be found at http://www.kemptechnologies.com/documentation. HA for Azure, Feature Description Software Migration - Version 6 to 7, Technical Note Web User Interface (WUI), Configuration Guide Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 36 / 37... -
Page 37: Document History
Updates for 7.0-14 release 2014 Apr 2014 Release updates Updates for 7.1-16 release Minor changes Improvements made to document 2014 June Minor changes Defects fixed 2014 Copyright © 2002 - 2014 KEMP Technologies, Inc. All Rights Reserved. Page 37 / 37...
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