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Cluster

Cluster (High Availability)

Cluster in LibraCyber Email Archiver enables High Availability (HA) for your appliance by pairing two independent nodes into a resilient active/passive setup.

What is it for?

A LibraCyber HA cluster ensures that if the primary (active) node fails — due to a crash, maintenance, or unexpected outage — the secondary (passive) node can take over and continue processing without significant downtime. This greatly improves reliability of your archive.

How it works

  • One node is designated active and handles all processing and service tasks.

  • A second node is passive and kept in sync with the active node.

  • The active node synchronizes all data and configuration to the passive node every day so that both remain fully aligned.

  • Synchronization occurs regularly (and you can monitor sync status via the cluster UI). The passive node stays ready to take over if needed.

In the event the active node becomes unavailable, the passive node can be promoted to active to maintain archive availability.

Important considerations

  • HA ≠ performance boost
    The cluster does not improve ingestion rates, capacity, or general performance — its purpose is solely to minimize downtime and maintain continuity of service.

  • Passive node behavior
    The passive node should not be used for production workloads or as a standalone system. Although it is synchronized with the active node, it can become active if the primary fails or is lost, and should always be treated as part of the HA pair.

Cluster Setup

From this page you can configure your cluster and choose the active or passive node you want to pair: To start the configuration begin always from the node you are considering will be "Active", therefore click "Begin configuration" and choose "Begin setup as ACTIVE"

In the next step we need to click on "Generate" to generate the SSH key used from the passive node to connect to the active one. Once the key is generated, is possible to copy to the clipboard the key by clicking on the grey button, then continue the installation clicking on "Next Step".

Now we need to switch browser tab and go into the Passive node. Once on the same configuration page and click always "Begin configuration" and choose "Begin setup as PASSIVE"

In this page we need to enter the Active Node IP address (Check the Network tab on the Active Node to retrieve the IP address), and insert also the previously generated key for the SSH connection. Once all the fields are completed, click "Verify connection" and if the connection is successful, click "Next Step".

Now we need to switch browser tab and go into the Active Node.

In the next page you will be asked to enter the Passive Node IP address (Check the Network tab on the Passive Node to retrieve the IP address), then click "Finalize configuration".

At the end, once setup is completed, the page will automatically refresh on both nodes to display the status of the Cluster.

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