mysql.cnf

[mysql]

no_auto_rehash
max_allowed_packet             = 16M
default_character_set          = utf8                                # Possibly this setting is correct for most recent Linux systems

[mysqldump]

max_allowed_packet             = 16M

[mysqld_safe]

open_files_limit               = 8192                                # You possibly have to adapt your O/S settings as well
user                           = mysql
log-error                      = hostname_error.log

[mysqld]

max_allowed_packet             = 16M
default_storage_engine         = InnoDB

max_connections                = 505                                 # Values < 1000 are typically good
max_user_connections           = 500                                 # Limit one specific user/application
thread_cache_size              = 505                                 # Up to max_connections makes sense

# Query Cache

query_cache_type               = 1                                   # Set to 0 to avoid global QC Mutex
query_cache_size               = 32M                                 # Avoid too big (> 128M) QC because of QC clean-up lock!

# Session variables

sort_buffer_size               = 2M                                  # Could be too big for many small sorts
tmp_table_size                 = 32M                                 # Make sure your temporary results do NOT contain BLOB/TEXT attributes

read_buffer_size               = 128k                                # Resist to change this parameter if you do not know what you are doing
read_rnd_buffer_size           = 256k                                # Resist to change this parameter if you do not know what you are doing
join_buffer_size               = 128k                                # Resist to change this parameter if you do not know what you are doing

# Other buffers and caches

table_definition_cache         = 400                                 # As big as many tables you have
table_open_cache               = 512                                 # connections x tables/connection (~2)

# MySQL error log

log_error                      = hostname_error.log
# log_timestamps                 = SYSTEM                              # MySQL 5.7, equivalent to old behaviour
log_warnings                     = 2
# log_error_verbosity            = 3                                   # MySQL 5.7, equivalent to log_warnings = 2
# innodb_print_all_deadlocks     = 1
# wsrep_log_conflicts            = 1                                   # for Galera only!


# Slow Query Log

slow_query_log_file            = hostname_slow.log
slow_query_log                 = 0
log_queries_not_using_indexes  = 0
long_query_time                = 0.5
min_examined_row_limit         = 100

# General Query Log

general_log_file               = hostname_general.log
general_log                    = 0

# Binary logging and Replication
log_bin                        = hostname_binlog                     # Locate outside of datadir
# master_verify_checksum         = ON                                  # MySQL 5.6
binlog_cache_size              = 1M
binlog_stmt_cache_size         = 1M
max_binlog_size                = 128M                                # Make bigger for high traffic to reduce number of files
sync_binlog                    = 0                                   # Set to 1 or higher to reduce potential loss of binary-log data
expire_logs_days               = 5                                   # We will survive easter holidays
binlog_format                  = ROW                                 # Use MIXED if you experience some troubles
# binlog_row_image               = MINIMAL                             # Since 5.6
# auto_increment_increment       = 2                                   # For Master/Master set-ups use 2 for both nodes
# auto_increment_offset          = 1                                   # For Master/Master set-ups use 1 and 2


# Slave variables

log_slave_updates              = 1                                   # Use if Slave is used for Backup and PiTR
read_only                      = 0                                   # Set to 1 to prevent writes on Slave
# skip_slave_start               = 1                                   # To avoid start of Slave thread
# relay_log                      = hostname-relay-bin
# relay_log_info_repository      = table                               # MySQL 5.6
# master_info_repository         = table                               # MySQL 5.6
# slave_load_tmpdir              = '/tmp'


# Security variables

# local_infile                   = 0                                   # If you are security aware
# secure_auth                    = 1                                   # If you are security aware
# sql_mode                       = TRADITIONAL,ONLY_FULL_GROUP_BY,NO_ENGINE_SUBSTITUTION,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER   # Be careful changing this afterwards
# skip_name_resolve              = 0                                   # Set to 1 if you do not trust your DNS or experience problems
# secure_file_priv               = '/tmp'                              # chmod 750


# MyISAM variables

key_buffer_size                = 8M                                    # Set to 25 - 33 % of RAM if you still use MyISAM
myisam_recover_options         = 'BACKUP,FORCE'
# disabled_storage_engines       = 'MyISAM'                            # MySQL 5.7, do NOT during/before mysql_upgrade


# MEMORY variables

max_heap_table_size            = 64M                                 # Should be greater or equal to tmp_table_size

# InnoDB variables

innodb_strict_mode             = ON
innodb_file_format_check       = 1
# innodb_file_format             = Barracuda                           # For dynamic and compressed InnoDB tables
innodb_buffer_pool_size        = 128M                                  # Go up to 80% of your available RAM
innodb_buffer_pool_instances   = 8                                     # Bigger if huge InnoDB Buffer Pool or high concurrency

innodb_file_per_table          = 1                                     # Is the recommended way nowadays
# innodb_flush_method            = O_DIRECT                            # O_DIRECT is sometimes better for direct attached storage
# innodb_write_io_threads        = 8                                   # If you have a strong I/O system or SSD
# innodb_read_io_threads         = 8                                   # If you have a strong I/O system or SSD
# innodb_io_capacity             = 1000                                # If you have a strong I/O system or SSD

innodb_flush_log_at_trx_commit = 0                                   # 1 for durability, 0 or 2 for performance
innodb_log_buffer_size         = 8M                                  # Bigger if innodb_flush_log_at_trx_commit = 0
innodb_log_file_size           = 256M                                # Bigger means more write throughput but longer recovery time


# Galera specific MySQL parameter

# default_storage_engine         = InnoDB                            # Galera only works with InnoDB
# innodb_flush_log_at_trx_commit = 0                                 # Durability is achieved by committing to the Group
# innodb_autoinc_lock_mode       = 2                                 # For parallel applying
# binlog_format                  = row                               # Galera only works with RBR
# query_cache_type               = 0                                 # Use QC with Galera only in a Master/Slave set-up
# query_cache_size               = 0


# WSREP parameter

# wsrep_provider                 = none                                # Start mysqld without Galera
# wsrep_provider                 = /usr/lib/galera/libgalera_smm.so    # Location of Galera Plugin on Ubuntu ?
# wsrep_provider                 = /usr/lib64/galera-3/libgalera_smm.so   # Location of Galera Plugin on CentOS 7
# wsrep_provider_options         = 'gcache.size = 1G'                  # Depends on you workload, WS kept for IST

# wsrep_cluster_name             = "My cool Galera Cluster"            # Same Cluster name for all nodes
# wsrep_cluster_address          = "gcomm://"                          # Initial Cluster start
# wsrep_cluster_address          = "gcomm://192.168.0.2,192.168.0.3"   # Start other nodes like this

# wsrep_node_name                = "Node A"                            # Unique node name
# wsrep_node_address             = 192.168.0.1                         # Our address where replication is done
# wsrep_node_incoming_address    = 10.0.0.1                            # Our external interface where application comes from
# wsrep_causal_reads             = 1                                   # If you need realy full-synchronous replication (Galera 3.5 and older)
# wsrep_sync_wait                = 1                                   # If you need realy full-synchronous replication (Galera 3.6 and newer)
# wsrep_slave_threads            = 1                                   # 4 - 8 per core, not more than wsrep_cert_deps_distance

# wsrep_sst_method               = mysqldump                           # SST method (initial full sync): mysqldump, rsync, rsync_wan, xtrabackup-v2
# wsrep_sst_auth                 = sst:secret                          # Username/password for sst user
# wsrep_sst_receive_address      = 192.168.0.1                         # Our address where to receive SST