MySQL Config Diff
This program can compare configurations and default values from different MySQL config sources like cnf files, SHOW VARIABLES and MySQL defaults parsed from mysqld help.
Usage
pt-mysql-config-diff [--format=text/json] <src_1> <src_2>
where src could be a file name pointing to a .cnf file or to a file having MySQL default values from mysqld help or a dsn in the form of a default pt-tool dsn parameter: h=<host>,P=<port>,u=<user>,p=<password>.
Usage examples
Comparing .cnf vs .cnf files.
When comparing 2 cnf files, the program will show all keys having differences between the 2 files, including missing keys in both files.
pt-mysql-config-diff file1.cnf file2.cnf
Example:
cnf1.cnf
[mysqld]
key1=value1
key2= 2
key3= true
cnf2.cnf
[mysqld]
key1=value1
key2=3
key4=true
./pt-mysql-config-diff --format=text cnf1.cnf cnf2.cnf
key2: 2 <-> 3
key3: true <-> <Missing>
key4: <Missing> <-> true
Comparing .cnf vs SHOW VARIABLES
When comparing .cnf files vs SHOW VARIABLES, only configuration variables that exist in the cnf file are compared.
Example: comparing a cnf vs a MySQL 5.7 instance
cnf3.cnf
[mysqld]
innodb_buffer_pool_size=512M
log_slow_rate_limit=100.1234
log_slow_verbosity=full
./pt-mysql-config-diff --format=text ~/cnf3.cnf h=127.1,P=3306,u=root
log_slow_verbosity: full <-> <Missing>
innodb_buffer_pool_size: 536870912 <-> 134217728
log_slow_rate_limit: 100.1234 <-> <Missing>
Comparing SHOW VARIABLES vs SHOW VARIABLES
When comparing the same type of configs (SHOW VARIABLES on both sides), the program will show all keys having differences between the 2 instances, including missing keys in both sides.
Example: Comparing MySQL 5.7 vs MySQL 5.6
Note: the output has been truncated and only a few values are here as an example
Having MySQL 5.7 on port 3306 and MySQL 5.6 on port 3308:
./pt-mysql-config-diff --format=text h=127.1,P=3306,u=root h=127.1,P=3308,u=root
innodb_version: 5.7.20 <-> 5.6.38
innodb_buffer_pool_load_at_startup: 1 <-> 0
session_track_schema: ON <-> <Missing>
ssl_cert: server-cert.pem <->
performance_schema_setup_actors_size: -1 <-> 100
timed_mutexes: <Missing> <-> OFF
performance_schema_max_mutex_instances: -1 <-> 15906
innodb_undo_directory: ./ <-> .
simplified_binlog_gtid_recovery: <Missing> <-> OFF
session_track_gtids: OFF <-> <Missing>
sha256_password_proxy_users: OFF <-> <Missing>
rbr_exec_mode: STRICT <-> <Missing>
performance_schema_max_table_handles: -1 <-> 4000
performance_schema_max_metadata_locks: -1 <-> <Missing>
log_statements_unsafe_for_binlog: ON <-> <Missing>
Getting the list of variables having non-default values
To achieve this, you first need to generate a list of defaults for the MySQL version you are running:
touch /tmp/my.cnf
<path-to-mysql-bin>/mysqld --verbose --defaults-file=/tmp/my.cnf --help > ~/my-5.7.defaults
and then you can compare the values from SHOW VARIABLES against the defaults:
pt-mysql-config-diff --format=text h=127.1,P=3306,u=root ~/my-5.7.defaults
daemonize: <Missing> <-> FALSE
federated: <Missing> <-> ON
general_log_file: /var/lib/mysql/fa5f51a13d1a.log <-> /usr/local/mysql/data/karl-OMEN.log
log_warnings: 2 <-> 0
performance_schema_consumer_events_waits_history_long: <Missing> <-> FALSE
skip_grant_tables: <Missing> <-> FALSE
blackhole: <Missing> <-> ON
socket: /var/run/mysqld/mysqld.sock <-> /tmp/mysql.sock
open_files_limit: 1048576 <-> 5000
performance_schema_digests_size: 10000 <-> -1
log_tc_size: <Missing> <-> 24576
myisam_block_size: <Missing> <-> 1024
datadir: /var/lib/mysql/ <-> /usr/local/mysql/data/
performance_schema_consumer_events_statements_history: <Missing> <-> TRUE
log_short_format: <Missing> <-> FALSE
TODO
- Add option to skip missing values on right/left side
- Add option to skip certain variables
- Add option to show big numbers in human readable format (1K, 1M)
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