While creating an HA group, it is critical to ensure that all the devices in a particular HA set belong to a single IP space. In a scenario where there are four NIOS-X Servers a, b, c, and d, that are in a three HA groups with a hub and spoke design (a →b, a→c, a→ d) or a chain (a→b, b→c, c→d) the subnets for all the related peers must be in the same IP space.
For example, if you use two different IP spaces A and B, each of the IP spaces may have a subnet that contain the same IP address 10.0.0.1 which may lead to a conflict. To avoid such a scenario, it is required to have all the devices in a HA group under a single IP space.
To create an HA group, complete the following:
From the
...
Infoblox Portal, click
...
Configure > Networking > IPAM/DHCP
...
> HA Groups
...
> Create HA Group.
On the Create HA Group page, specify the following:
Name: Enter a name for the HA group.
Description: Enter additional information about the HA group.
SERVICE INSTANCES:
HA Configuration: Select one of the following:
Active / Active: Both
...
NIOS-X Servers remain active.
Active / Passive: One
...
NIOS-X Server remains active and one remains passive. When the active
...
NIOS-X Server is down, the passive
...
NIOS-X Server takes over.
Advanced Active / Passive: One host may be a part of multiple HA groups.
...
When the active
...
NIOS-X Server is down, the passive
...
NIOS-X Server takes over.
Active: Select a
...
NIOS-X Server from the column selector. This is the active
...
NIOS-X Server.
Port: Displays the port number associated with the respective
...
NIOS-X Server.
Active
...
NIOS-X Server / Passive
...
NIOS-X Server: Select a
...
NIOS-X Server from the column selector. This is the Active
...
NIOS-X Server if the HA Configuration is Active/Active. This is the Passive
...
NIOS-X Server if the HA Configuration is Active/Passive.
Switch Active / Passive: Click this button to switch
...
NIOS-X Servers between Active and Passive. On clicking the button, the Active node becomes the Passive node. This feature can be used to initiate a manual failover and for troubleshooting purposes.
Port: Displays the port number associated with the respective
...
NIOS-X Server.
Anycast: In Anycast mode, Anycast is used for configuring HA. Before creating a DHCP HA group by using Anycast, make sure Anycast is configured on the Anycast page; for more information, see Creating Anycast Configuration. DHCP with Anycast can be configured only with two nodes. On the Create HA Group page, select the Anycast configuration available:
Peer Connections: Configure the peer connections for the Anycast configuration. Peer connection IPs are the addresses over which the users want two hosts in this HA group to communicate. Default values will be the two hosts' primary addresses. You can override them, but make sure that the new values represent the interfaces available on these two hosts.
Destination IP: Specify an IPv4 address.
Tags: For information about tags, see Managing Tags.
Click Save & Close to save the details or click Cancel to exit.
| Note |
|---|
NoteIt is highly recommended to configure hostsNIOS-X Servers in such a way that there is no communication failure between them. This is to avoid a situation where both hostsNIOS-X Servers are attempting to serve the same subnet at the same time due to communication failure. |
| Note |
|---|
...
NoteWhen the active |
...
NIOS-X Server goes down the active or passive |
...
NIOS-X Server takes over as per your configuration. However, there may be a short delay in the switchover which may result in a gap in the lease allocation. |
| Note |
|---|
...
NoteIf you assign a different |
...
NIOS-X Server for the Anycast configuration on the Anycast page, you must modify the HA group to use the modified |
...
NIOS-X Server. If you change the linked protocol in the Anycast configuration on the Anycast page to DNS, you must delete the HA group. |
Status Changes in HA Peer
When an HA peer changes status (if a
...
NIOS-X Server is down), the status is shown on the
...
NIOS-X Servers page. Error messages related to issues with the
...
NIOS-X Server are also displayed. For more information, see Viewing
...
| Note |
|---|
NoteIt is highly recommended to configure devices in an HA pair with the same time. You can either do it by syncing the devices to an NTP server or updating the time manually, with a difference of no more than 30 seconds. Failing to do so will lead to the HA pair not syncing with each other. In such a scenario, sync the devices and restart the DHCP service. If you see the message This hostNIOS-X Server in HA mode with peer reported: terminated, re-sync the time on the HA peers to an NTP server or update the time manually. |
| Warning |
|---|
HA groups are not supported for IPv6. |
...