Migration paths Graylog documents for existing deployments, such as moving a self-managed OpenSearch backend onto Graylog Data Node.
Moving the search backend under an existing Graylog onto Data Node with the in-place migration wizard: version prerequisites, backups, certificate authority and renewal policy, installing Data Node on each OpenSearch host, the TLS-secured variant, and rollback planning.
Getting an older Graylog off Elasticsearch, which Graylog 7.0 deprecates and 8.0 removes: full-cluster restart versus rolling and snapshot methods, journal capacity during the switch, and the later move to Data Node.
Planning the OpenSearch upgrade that Graylog 7 requires in practice: OpenSearch 1.x deprecation, supported versions up to 3.7, Graylog Security's need for 2.0 or later, and whether to upgrade OpenSearch or switch to Data Node.
Growing a single-server Graylog into the recommended three Graylog and MongoDB nodes with three Data Nodes: converting MongoDB to a replica set, follower nodes, a load balancer and moving inputs without losing logs.
Moving Graylog from VMs or Docker hosts onto Kubernetes with the official Helm chart: MongoDB through the operator or an external URI, Data Node storage, exposing inputs and cutting over log sources.
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