Managing Updates - ACRONIS Cyber Appliance Quick Start Manual

5 Managing updates
Acronis Cyber Infrastructure supports non-disruptive rolling updates. Cluster nodes are updated
one by one, with the data availability unaffected. During the update, the node enters maintenance
mode and its workloads and VMs are migrated to other nodes. After the update, the node returns to
operation. For more information on the maintenance mode, refer to "Performing node
maintenance" in the in the Administrator Guide.
Take note of the following before you start updating nodes:
Nodes must be updated only in the admin panel or via the vinfra tool (refer to "Managing
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updates" in the Administrator Command Line Guide). Do not use yum update.
Disable any third-party repositories.
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To check for and download updates, the cluster must be healthy and each node in the
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infrastructure must be able to open an outgoing Internet connection. This means that nodes
must not be offline, and the cluster DNS must be configured and point to a DNS table to resolve
external host names. For more details, refer to "Adding external DNS servers" in the
Administrator Guide.
Unassigned nodes can be updated.
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Updates are applied to one cluster node at a time.
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To update the storage cluster from the admin panel, do the following:
1. Open the Settings > Updates screen. The date of the last check is displayed in the upper right
corner. Click the round arrow to check for new updates. If updates are available for a node, that
node's update status changes to Available.
2. Click Download in the upper right corner to get the updates. When the updates are downloaded
to a node, its update status changes to Ready to install. After the updates have been
downloaded for all of the nodes, the button will change to Install. Click it to continue.
3. In the Install updates window, choose how to proceed if a node needs to be rebooted but
cannot enter maintenance mode. To avoid downtime, nodes that need to be rebooted are
placed in maintenance mode one by one during the update. Nodes that cannot enter
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