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The Plugin 'mysql_native_password' is not loaded error appears because MySQL 8.4 disables that authentication method and 9.x removes it, and mysql:lts is now 9.7.4. Start 8.4 with --mysql-native-password=ON, convert every account to caching_sha2_password with ALTER USER, then move to 9.7.
NetBird 0.82 removed the MySQL engine, and the server stops with the error the MySQL store engine is no longer supported. Roll back to the 0.81.5 image, move the data to PostgreSQL with the netbird-mysql-migrate tool from that same version, because 0.82 no longer ships it, and only then upgrade by pinning the 0.82.0 tag.
MariaDB 11.7 (November 2024) adds native vector search with an HNSW index, JSON improvements via JSON_OBJECT_AGG, and 5-15% faster read workloads versus 11.5. Against MySQL 8, the edge is not depending on HeatWave for embeddings; against PostgreSQL, it still trails on JSON depth and data types.
