# Example MySQL config file for medium systems.  #  # This is for a system with little memory (32M - 64M) where MySQL plays  # an important part, or systems up to 128M where MySQL is used together with  # other programs (such as a web server)  #  # 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]default-character-set=utf8#password   = your_password  port        = 3306  socket      = /tmp/mysql.sock   # Here follows entries for some specific programs  # The MySQL server  [mysqld]character-set-server=utf8init_connect='SET NAMES utf8port        = 3306  socket      = /tmp/mysql.sock  skip-external-locking  key_buffer_size = 16M  max_allowed_packet = 1M  table_open_cache = 64  sort_buffer_size = 512K  net_buffer_length = 8K  read_buffer_size = 256K  read_rnd_buffer_size = 512K  myisam_sort_buffer_size = 8M  character-set-server=utf8  init_connect='SET NAMES utf8'
# 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 = /usr/local/mysql/data  #innodb_data_file_path = ibdata1:10M:autoextend  #innodb_log_group_home_dir = /usr/local/mysql/data  # You can set .._buffer_pool_size up to 50 - 80 %  # of RAM but beware of setting memory usage too high  #innodb_buffer_pool_size = 16M  #innodb_additional_mem_pool_size = 2M  # Set .._log_file_size to 25 % of buffer pool size  #innodb_log_file_size = 5M  #innodb_log_buffer_size = 8M  #innodb_flush_log_at_trx_commit = 1  #innodb_lock_wait_timeout = 50  [mysqldump]  quick  max_allowed_packet = 16M  [mysql]  no-auto-rehash  # Remove the next comment character if you are not familiar with SQL  #safe-updates  default-character-set=utf8   [myisamchk]  key_buffer_size = 20M  sort_buffer_size = 20M  read_buffer = 2M  write_buffer = 2M  [mysqlhotcopy]  interactive-timeout

sudo chmod 664　/etc/my。cnf

https://blog.csdn.net/wyzxg/article/details/8787878  参数可以看下