如果MySQL是通過解壓版本安裝的, 可能沒有配置文件, 這就需要手動(dòng)創(chuàng)建一個(gè)配置文件

在/etc中創(chuàng)建文件my.cnf

拷貝一份配置文件的內(nèi)容

 # 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=utf8
 init_connect='SET NAMES utf8
 port = 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

最后, 需要更改一下該文件的訪問權(quán)限為664, 即rw-rw-r--