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To place MySQL binary logs in another directory, configure the server’s --log-bin option with an absolute destination path and a base name, then restart MySQL. For example: --log-bin=/var/lib/mysql-bin/binlog. After startup, check log_bin_basename to confirm the path MySQL is using. If you are relocating existing logs, stop the server before moving files or editing the binary-log index.
Choose whether to redirect new logs or move existing ones
The binary-log files and their index file normally reside in MySQL’s data directory. The --log-bin option sets the log base name and can include an absolute path to another directory; MySQL creates numbered log files using that base name. The MySQL 8.0 Reference Manual documents both the default location and the option’s path behavior.
- Redirect future logging: Change the configured path and restart. Decide separately what to do with the existing logs and index; do not assume changing the option automatically migrates or preserves the old sequence.
- Relocate existing logs: Treat the change as a maintenance operation. The files, index entries, backups, and any replication consumers that need the sequence must be handled together.
Check the current configuration and index before changing paths
Before scheduling the change, identify the exact MySQL version, current log_bin_basename, the index-file location, and whether the index contains relative or absolute paths. Use documentation for the installed release: defaults and some basename behavior differ between MySQL 5.7, 8.0, and 8.4.
The index-file distinction matters during a move. Relative paths in index entries are interpreted using the path configured by --log-bin; absolute paths remain absolute. If entries are absolute, MySQL’s manual says the index must be edited to use the new paths. Never edit the index while mysqld is running.
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Prepare the destination and maintenance window
- Make a recoverable backup before changing files.
- Create or confirm the destination directory and ensure the MySQL service account can access it.
- Confirm the destination has suitable storage capacity and plan how backups and replication consumers will retain access to any required log sequence.
- Schedule downtime if existing log files or the index will be moved or edited. Shut MySQL down cleanly before those file operations.
These are operational precautions; the MySQL references do not prescribe one universal directory, operating-system permission command, or migration checklist for every deployment.
Configure MySQL to use the new directory
- Find the startup configuration used by this installation. Add the setting to the applicable server option file or service startup configuration. Its location and editing method depend on the operating system and how MySQL was installed.
- Set an absolute path and base name. For example, configure
--log-bin=/var/lib/mysql-bin/binlog. Choose a base name, not a path ending in a specific numbered log file. - If moving existing files, stop MySQL before moving or editing. Move the required files to the destination and reconcile absolute index entries so they refer to the intended files. Preserve the sequence needed for recovery, backups, or replication.
- Start MySQL using the normal service procedure for the installation. If startup fails, inspect the MySQL error log and verify the configured path and directory access.
Verify the active path and protect dependent workflows
After startup, inspect log_bin_basename; it reports the active binary-log base name and path. Confirm that MySQL is creating logs in the destination and that the server started without relevant errors. Then verify that backups and replication consumers can still read the log sequence they require before deleting old copies. Retention and migration requirements vary by topology, so do not remove the originals merely because the server has started successfully.
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Account for MySQL version and GTID use
- MySQL 8.0: Binary logging is enabled by default, except for data directories initialized manually with
--initializeor--initialize-insecure; in that case,--log-bincan enable it. The default base name isbinlogwhen no option is supplied, with compatibility behavior for an empty option. See the 8.0 binary-log reference and 8.0 binary logging options and variables. - MySQL 8.4: The manual documents the same broad default and manual-initialization exception. If GTIDs are in use, do not combine relocation with disabling binary logging after an abnormal shutdown: recovery can lose GTIDs and break replication. See MySQL 8.4 binary logging options and variables.
- MySQL 5.7: Its manual describes a host-derived default basename and older-version relocation differences. Apply those details only to systems actually running 5.7; consult the MySQL 5.7 replication manual.
A 2014 Oracle MySQL blog post announced mysqlbinlogmove in MySQL Utilities 1.6.0 Alpha as a stopped-server utility for relocating binary logs. That announcement is historical and does not establish that the utility remains available or supported; the manual-based configuration and careful file handling above do not depend on it. See Oracle’s 2014 announcement.
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