MySQL configuration file for Percona XtraDB Cluster

my.cnf

[client]
port   = 3306
socket = /var/run/mysqld/mysqld.sock


[mysqld]
port                    = 3306
datadir                 = /var/lib/mysql
socket                  = /var/run/mysqld/mysqld.sock
max_connections         = 500
transaction-isolation   = 'READ-COMMITTED'

# caching and optimisations
join_buffer_size   = 128
table_cache        = 96
table_open_cache   = 64
thread_cache_size  = 128 # see http://cl.ly/142s250i1S0o
thread_stack       = 256K
tmp_table_size     = 256M
max_allowed_packet = 500M
read_buffer_size   = 128K

slow-query-log-file = /var/log/mysql/slow-queries.log # file must first be created and owned by the MySQL user - see http://cl.ly/142T211c0Z35
long_query_time     = 5

skip-external-locking
skip-name-resolve

#========#
# InnoDB #
#========#

innodb_flush_method                 = ALL_O_DIRECT # see http://cl.ly/040b1B1H1I2C
innodb_buffer_pool_size             = 5G # for 8GB RAM - it should be ~70-80% of the available RAM.
innodb_log_buffer_size              = 8M
innodb_log_file_size                = 50M # DO see http://cl.ly/3A3l2y170J29 and http://cl.ly/133W402C050v for more details on how to change this setting safely
innodb_support_xa                   = 0 # OK with Galera synchronous replication
innodb_import_table_from_xtrabackup = 1 # allows restoring a single table - see http://cl.ly/2F230t0D340A
innodb_flush_log_at_trx_commit      = 0 # speeds things up, can lose 1 second worth of transactions if MySQL crashes. This is fine for us at the moment.
innodb_doublewrite                  = 1 # ensures an incremental state transfer will be tried if possible - see http://cl.ly/1E0w1v0z1m0n

innodb_file_per_table

#================================#
# Galera synchronous replication #
#================================#

binlog_format                  = row
innodb_locks_unsafe_for_binlog = 1
server-id                      = 30 # change on each node! - not strictly required for Galera, but it's safer to have a unique id on each node in case normal replication is also used
innodb_autoinc_lock_mode       = 2
query_cache_type               = 0
query_cache_size               = 0
default_storage_engine         = InnoDB
wsrep_cluster_name             = "Percona-XtraDB-Cluster"
wsrep_node_name                = "db3" # change this on each node!
wsrep_provider                 = /usr/lib/libgalera_smm.so
wsrep_cluster_address          = "gcomm://db1:4567" # set to "gcom://"" to reinitialise (reset) a node; otherwise ensure it is pointing to a valid node
wsrep_slave_threads            = 16 # recommended: 4 slave thread per core - see http://cl.ly/0z0l0K3v3Y0j
wsrep_retry_autocommit         = 2 # how many times to retry deadlocked autocommits
wsrep_convert_LOCK_to_trx      = 0 # convert locking sessions into transactions; see http://cl.ly/2c0N3B0f1v41
wsrep_certify_nonPK            = 1 # Generate fake primary keys for non-PK tables (required for multi-master and parallel applying operation)


# rsync or xtrabackup; remember to create the user 'mysql'@'localhost' on each node, with all privileges for the xtrabackup-based SST to work
# see http://cl.ly/153r0A2k0G1N
wsrep_sst_method               = xtrabackup 

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size  = 20M
sort_buffer_size = 20M
read_buffer      = 2M
write_buffer     = 2M

[mysqlhotcopy]
interactive-timeout