Graylog MongoDB Backup

Overview

Backs up the MongoDB graylog database to dual NAS storage for redundancy. Preserves all inputs, pipelines, streams, indexes, dashboards, users, and settings. Configuration files are managed as code by the graylog_install role and are not included. Log data (OpenSearch indices) is intentionally excluded — only the configuration database is backed up.

What This Role Does

1. Stops graylog-server to ensure a consistent database snapshot
2. Runs mongodump on the graylog database to a local staging directory
3. Creates a compressed tar.gz archive of the dump
4. Copies the archive to both NAS devices with a timestamped filename
5. Removes the local staging directory after the copy completes
6. Restarts graylog-server
7. Removes old backups, keeping only the 5 most recent per NAS

Role Variables

Variable	Description
graylog_mongodb_backup_syno_mount_point	Synology NAS backup destination
graylog_mongodb_backup_prxmxomv_mount_point	Proxmox OMV NAS backup destination
graylog_mongodb_backup_keep	Number of backups to keep per NAS
graylog_mongodb_backup_mongodb_host	MongoDB host
graylog_mongodb_backup_mongodb_port	MongoDB port
graylog_mongodb_backup_mongodb_db	MongoDB database name
graylog_mongodb_backup_local_tmp	Local staging directory (auto-deleted after backup)

Notes

• graylog-server is stopped during the MongoDB dump for consistency, then restarted — expect a brief outage
• MongoDB itself remains running during the dump
• The local staging directory is automatically removed after the archive is copied to the NAS
• Keeps the last 5 backups per NAS by default; older files are auto-deleted
• Use the graylog_mongodb_restore role to restore from a backup (run graylog_install first)