root@mysqltest:/etc/mysql/mysql.conf.d# cat mysqld.cnf # # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. # Here is entries for some specific programs # The following values assume you have at least 32M ram [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql interactive_timeout = 9504000 wait_timeout = 9504000 skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. # bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer_size = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 lower_case_table_names=1 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover-options = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error log - should be very few entries. # log_error = /var/log/mysql/error.log # # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem root@mysqltest:/etc/mysql/mysql.conf.d#
需要特别注意的是：
interactive_timeout = 9504000 wait_timeout = 9504000 skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. # bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer_size = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 lower_case_table_names=1 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover-options = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 16M
如果需要远程访问，需要注释掉
# bind-address = 127.0.0.1
Ubuntu16.0.4中MySQL的配置文件存在于/etc/mysql/mysql.conf.d/mysqld.cnf
root@mysqltest:/etc/mysql/mysql.conf.d# pwd
/etc/mysql/mysql.conf.d
root@mysqltest:/etc/mysql/mysql.conf.d# ll
total 16
drwxr-xr-x 2 root root 4096 Oct 24 10:51 ./
drwxr-xr-x 4 root root 4096 Sep 22 15:40 ../
-rw-r--r-- 1 root root 3115 Oct 24 10:51 mysqld.cnf
-rw-r--r-- 1 root root 21 Feb 4 2017 mysqld_safe_syslog.cnf
另外java项目配置hibernate的时候加上自动重连的参数
hibernate.connection.url=jdbc:mysql://ip:3306/ucom?characterEncoding=utf8&autoReconnect=true
如果是xml，&符号需要&进行转义
<Resource auth="Container" driverClassName="com.mysql.jdbc.Driver" maxActive="80" maxIdle="30" maxWait="1000" name="ucomdb" password="gdyl2017" type="javax.sql.DataSource" url="jdbc:mysql://ip:3306/ucom?characterEncoding=utf8&autoReconnect=true" username="root"/>