Backup Methods
Upgrade release notes
https://dev.mysql.com/doc/relnotes/mysql/5.7/en/
Physical (in-place)
1. Stop MySQL server process
2. Replace mysqld binary with new version
3. Start MySQL server process using new binary
4. Run mysql_upgrade.
Logical (Backup/restore)
1. Use mysqldump to backup current database.
2. Install new empty MySQL server.
3. Restore backed-up databases.
4. Run mysql_upgrade.