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Version: v6

High Availiability

Overview​

High availability (HA) is the ability of a system to operate continuously without failing for a designated period of time. HA works to ensure a system meets an agreed-upon operational performance level. Haltdos platform provides built-in capability for high availability using VRRP technology.

info

For more information on the deployment architecture, please see Infrastructure & Deployment.

Cluster / HA Active-Active

Haltdos platform consists of Stacks for multi-tenancy. Each Stack corresponds to a Cluster that contains one or more instances. Every instance in the stack runs the same policy as defined by the user. These instances synchronise data in real-time among themselves using Auxiliary Plane. These instances therefore run in Active-Active (if 2 instances) or Cluster mode (more than 2 instances) by design.

HA Active-Passive

To configure instances in Active-Passive mode, configure HA settings in each instances. In Layer 3 mode, they will share the same VIP and depending upon the status of the instance, any one of them will be actively handling the traffic.

high availiability

How to Use:​

  1. Go to Stack > Instances > (Select Instance) > HA
  2. Configure your settings
  3. Click Save

Description​

HA MODE

Specify high availability mode between multiple mitigation instances

PRIMARY INSTANCE

Enable if this instance is primary

HA PORT

Specify port over which mitigation instances communicate with each other

PEER CHECK INTERVAL

Specify the time in milliseconds (ms) after which one mitigation instance checks the health of its peer

PEER FAILURE THRESHOLD

Specify the number of failed peer health checks after which a mitigation instance consider its peer unhealthy

PEER RECOVERY THRESHOLD

Specify the number of successful peer health checks after which a mitigation instance changes its peer status from unhealthy to healthy

MAXIMUM ALLOWED FLAPS

Specify allowed number of flaps after which the primary instance goes into hardware bypass

ENABLE BANDWIDTH MONITORING

Specify if bandwidth monitoring should be used to trigger failover in HA cluster

MINIMUM BANDWIDTH

Specify minimum bandwidth in bps for specified interval in seconds below which failover is triggered

LINK MONITORING INTERVAL

Specify interval in milliseconds (ms) for periodic link monitoring between multiple mitigation instances

MINIMUM ACTIVE LINKS

Specify the minimum allowed active link pairs below which the solution will mark itself down