Planning Cluster AZs and HA
This topic describes how to improve cluster availability by deploying each cluster across multiple AZs, including defining the rules that govern how cluster nodes are distributed across AZs.
An availability zone (AZ) is a physical region where resources use independent power supplies and networks. AZs in the same region can communicate with each other through internal networks but are physically isolated.
Multi-AZ deployment is a high availability feature provided by CSS. Deploying a cluster across two AZs located in the same region can help prevent data loss and lower the possibility of service outages.
Suggestions on Multi-AZ Deployment
If you select multi-AZ deployment when creating a cluster, CSS automatically enables cross-AZ HA to ensure that cluster nodes will be evenly distributed across the selected AZs (the difference between the number of nodes in each AZ cannot exceed 1).
A Logstash cluster can span a maximum of two AZs.
Node Distribution Rules
When a multi-AZ cluster is created, nodes of all types are evenly distributed across different AZs. A maximum of two AZs can be used. Table 1 shows the node distribution when the number of AZs varies.
When creating a multi-AZ cluster, select at least two nodes. Otherwise, multi-AZ cluster deployment will fail.
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