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 hosts 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.
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To create an HA group, complete the following:
- From the Cloud Services Infoblox Portal, click Manage - > 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 hosts NIOS-X Servers remain active.
- Active / Passive: One host NIOS-X Server remains active and one remains passive. When the active host NIOS-X Server is down, the passive host NIOS-X Server takes over.
Advanced Active / Passive: One host may be a part of multiple HA groups. When the active host NIOS-X Server is down, the passive host NIOS-X Server takes over.
Active: Select a host NIOS-X Server from the column selector. This is the active hostNIOS-X Server.
Port: Displays the port number associated with the respective hostNIOS-X Server.
Active Host NIOS-X Server / Passive HostNIOS-X Server: Select a host NIOS-X Server from the column selector. This is the Active HostNIOS-X Server if the HA Configuration is Active/Active. This is the Passive HostNIOS-X Server if the HA Configuration is Active/Passive.
- Switch Active / Passive: Click this button to switch hosts 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 hostNIOS-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.
- 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.
- Tags:For information about tags, see Managing Tags.
Click Save & Close to save the details or click Cancel to exit.
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It is highly recommended to configure hosts NIOS-X Servers in such a way that there is no communication failure between them. This is to avoid a situation where both hosts NIOS-X Servers are attempting to serve the same subnet at the same time due to communication failure. |
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When the active host NIOS-X Server goes down the active or passive host 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. |
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If you assign a different host NIOS-X Server for the Anycast configuration on the Anycast page, you must modify the HA group to use the modified hostNIOS-X Server. If you change the linked protocol in the Anycast configuration on the Anycast page to DNS, you must delete the HA group. |
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When an HA peer changes status (if a host NIOS-X Server is down), the status is shown on the Hosts NIOS-X Servers page. Error messages related to issues with the host NIOS-X Server are also displayed. For more information, see Viewing General Host Server Information.
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It 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 host NIOS-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. |
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