1.Existing proddb-mast01 has 20Gb Ram Existing proddb-slavedb has 16Gb Ram in proddb-slavedb has to increase 4gb Ram 2. Existing proddb-mast01 has duplicate lines (innodb_buffer_pool_size) have to remove 3. my.cnf have to change from mysql master to mysql slave as identical except server id 4. Have to add below parameter from slave to master my.cnf [mysqld] skip-name-resolve Description To disable DNS host name lookups, start the server with the --skip-name-resolve option. In this case, the server uses only IP addresses and not host names to match connecting hosts to rows in the MySQL grant tables. Only accounts specified in those tables using IP addresses can be used. (Be sure that an account exists that specifies an IP address or you may not be able to connect.) 5. have to add below parameter from master to slave my.cnf #For enabling logs required below parameters log_bin_trust_function_creators=1 log_bin=/var/log/mysql/xlogs/cbprd max_binlog_size=10M binlog_format=mixed ##Specifies the size of the buffer pool. If the buffer pool is small and you have sufficient memory, making the buffer pool larger can improve performance by reducing the amount of disk I/O needed as queries access InnoDB tables. innodb_buffer_pool_size = 14G ##have to increase from 8G to 14G on slave innodb_flush_method = O_DIRECT innodb_thread_concurrency = 6 innodb_flush_log_at_trx_commit = 2 innodb_buffer_pool_instances = 6 max_allowed_packet = 32M #For enabling logs required below parameters log_bin_trust_function_creators=1 log_bin=/var/log/mysql/xlogs/cbprd max_binlog_size=10M binlog_format=mixed #For mysql performance required below parameters innodb_buffer_pool_size = 14G ##have to increase from 8G to 14G on slave innodb_flush_method = O_DIRECT innodb_thread_concurrency = 6 innodb_flush_log_at_trx_commit = 2 innodb_buffer_pool_instances = 6 max_allowed_packet = 32M ##have to increase from 16M to 32M Both the client and the server have their own max_allowed_packet variable, so if you want to handle big packets, you must increase this variable both in the client and in the server. Above changes and increase ram size required down time please approve
mysql master my.cnf
[expprodl@proddb-mast01 ~]$ cat /etc/my.cnf # Example MySQL config file for large systems. # # This is for a large system with memory = 512M where the system runs mainly # MySQL. # # MySQL programs look for option files in a set of # locations which depend on the deployment platform. # You can copy this option file to one of those # locations. For information about these locations, see: # http://dev.mysql.com/doc/mysql/en/option-files.html # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /var/lib/mysql/mysql.sock # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = /var/lib/mysql/mysql.sock skip-external-locking key_buffer_size = 256M max_allowed_packet = 32M tmp_table_size=64M max_heap_table_size=64M table_open_cache = 256 table_cache=2048 sort_buffer_size = 1M read_buffer_size = 1M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 64M thread_cache_size = 16 interactive_timeout=600 wait_timeout=28800 query_cache_size= 16M max_connections=200 # Try number of CPU's*2 for thread_concurrency thread_concurrency = 4 log_bin_trust_function_creators=1 tmpdir=/data00/mysql/tmpdir datadir=/data00/mysql/datadir log_bin=/var/log/mysql/xlogs/cbprd max_binlog_size=10M skip-name-resolve #sync_binlog=1 #slow-query-log = 1 #slow-query-log-file = /var/log/mysql-slow.log #long_query_time = 1 #log-queries-not-using-indexes # Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (via the "enable-named-pipe" option) will render mysqld useless! # #skip-networking # Replication Master Server (default) # binary logging is required for replication #log-bin=mysql-bin # binary logging format - mixed recommended binlog_format=mixed # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id = 1 # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - # the syntax is: # # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; # # where you replace <host>, <user>, <password> by quoted strings and # <port> by the master's port number (3306 by default). # # Example: # # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, # MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then # start replication for the first time (even unsuccessfully, for example # if you mistyped the password in master-password and the slave fails to # connect), the slave will create a master.info file, and any later # change in this file to the variables' values below will be ignored and # overridden by the content of the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason, you may want to leave the lines below untouched # (commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = <hostname> # # The username the slave will use for authentication when connecting # to the master - required #master-user = <username> # # The password the slave will authenticate with when connecting to # the master - required #master-password = <password> # # The port the master is listening on. # optional - defaults to 3306 #master-port = <port> # # binary logging - not required for slaves, but recommended #log-bin=mysql-bin # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /var/lib/mysql #innodb_data_file_path = ibdata1:10M:autoextend #innodb_log_group_home_dir = /var/lib/mysql # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high innodb_buffer_pool_size = 16G #innodb_additional_mem_pool_size = 20M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 64M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #innodb_lock_wait_timeout = 50 innodb_buffer_pool_size = 14G innodb_flush_method = O_DIRECT innodb_thread_concurrency = 6 innodb_flush_log_at_trx_commit = 2 innodb_buffer_pool_instances = 6 [mysqldump] quick max_allowed_packet = 32M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout
mysql slave my.cnf
[expprodl@proddb-slav01 ~]$ cat /etc/my.cnf [client] port = 3306 socket = /var/lib/mysql/mysql.sock [mysqld] port = 3306 socket = /var/lib/mysql/mysql.sock skip-external-locking key_buffer_size = 256M max_allowed_packet = 32M tmp_table_size=64M max_heap_table_size=64M table_open_cache = 256 table_cache=2048 sort_buffer_size = 1M read_buffer_size = 1M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 64M thread_cache_size = 16 interactive_timeout=600 wait_timeout=28800 query_cache_size= 16M max_connections=200 thread_concurrency = 4 #log_bin_trust_function_creators=1 tmpdir=/data00/mysql/tmpdir datadir=/data00/mysql/datadir #log_bin=/var/log/mysql/xlogs/cbprd #max_binlog_size=10M #binlog_format=mixed server-id = 2 innodb_buffer_pool_size = 8G [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M [mysqld] skip-name-resolve #sync_binlog=1 #slow-query-log = 1 #slow-query-log-file = /var/log/mysql-slow.log #long_query_time = 1 #log-queries-not-using-indexes [mysqlhotcopy] interactive-timeout