Set up high availability
UCP is designed for high availability (HA). You can join multiple manager nodes
to the cluster, so that if one manager node fails, another can automatically
take its place without impact to the cluster.
Having multiple manager nodes in your cluster allows you to:
- Handle manager node failures,
- Load-balance user requests across all manager nodes.
Size your deployment
To make the cluster tolerant to more failures, add additional replica
nodes to your cluster.
| Manager nodes |
Failures tolerated |
|---|
| 1 |
0 |
| 3 |
1 |
| 5 |
2 |
For production-grade deployments, follow these best practices:
- For HA with minimal network overhead, the recommended number of manager
nodes is 3. The recommended maximum number of manager nodes is 5. Adding too
many manager nodes to the cluster can lead to performance degradation,
because changes to configurations must be replicated across all manager
nodes.
- When a manager node fails, the number of failures tolerated by your
cluster decreases. Don’t leave that node offline for too long.
- You should distribute your manager nodes across different
availability zones. This way your cluster can continue working even
if an entire availability zone goes down.