mysql初始化，启动服务连接mysql的错误案例

mysql版本：Server version: 5.6.17 Source distribution，编译安装路径/usr/local/msyql
系统环境：
# uname -a
Linux swallow 2.6.32-431.el6.x86_64 #1 SMPFri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
首先初始化mysql（生成数据库的结构）

# ./scripts/mysql_install_db--basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql这里需要注意如果以前的数据库在运行，必须关掉。不然。是不停的循环。CRT下ctrl+c 和ctrl+z都停不下来。再接下来出现2个OK就说明成功了。这个是系统自带的my.cnf （/etc/my.cnf）[mysqld]datadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockuser=mysql# Disabling symbolic-links is recommendedto prevent assorted security riskssymbolic-links=0 [mysqld_safe]log-error=/var/log/mysqld.logpid-file=/var/run/mysqld/mysqld.pid
启动服务

[root@swallow mysql]#./support-files/mysql.server startStarting MySQL... ERROR! Theserver quit without updating PID file (/usr/local/mysql/data/swallow.pid).修改my.cnf[mysqld]basedir = /usr/local/mysql datadir = /usr/local/mysql/data port= 3306 server_id = 1 socket = /usr/local/mysql/data/mysql.sock user= mysqlsql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES[mysqld_safe]log-error=/usr/local/mysql/data/mysqld.logpid-file=/usr/local/mysql/data/swallow.pid然后将 my.cnf 替换系统自带的 # \mv my.cnf /etc/my.cnf# ./support-files/mysql.server startStarting MySQL. SUCCESS!服务启动成功。basedir = /usr/local/mysql datadir = /usr/local/mysql/data这2个参数也可以在启动脚本(./support-files/mysql.serve)里面修改。连接msyql

# ./bin/mysqlERROR 2002 (HY000): Can't connectto local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)出现错误。修改配置文件： vim/etc/my.cnf在末尾添加：[client]default-character-set=utf8socket=/usr/local/mysql/data/mysql.sock这里需要注意的是：不要在中间插入：因为 my.cnf 格式的模块是松散的没有明确的结束标志。容易把别的字段的配置隔断。造成无法解析。# ./bin/mysqlWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.17 Source distribution Copyright (c) 2000, 2014, Oracle and/or itsaffiliates. All rights reserved. Oracle is a registered trademark of OracleCorporation and/or itsaffiliates. Other names may be trademarksof their respectiveowners. Type 'help;' or '\h' for help. Type '\c' toclear the current input statement. mysql>今天重新安装mysql做mysql主从。发现原来哪些配置都是安装的时候加入的。如果需要修改只能通过修改配置文件my.cnf在启动的时候重新读取配置文件my.cnf 特别是在做多个 mysql实例的时候。就需要这些配置的支持。安装mysql的一些编译参数
-DCMAKE_INSTALL_PREFIX=/usr/local/mysql \
#指定安装路径
-DMYSQL_DATADIR=/usr/local/mysql/data \
#指定mysql数据（库）文件的存放路径
-DSYSCONFDIR=/etc \
#配置文件
-DWITH_MYISAM_STORAGE_ENGINE=1 \
#引擎支持myisam
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
#引擎支持 innodb
-DWITH_MEMORY_STORAGE_ENGINE=1 \
#引擎支持 memory-storage
-DWITH_READLINE=1 \

-DMYSQL_UNIX_ADDR=/var/lib/mysql/mysql.sock \
#指定mysql的sock文件路径
-DMYSQL_TCP_PORT=3306 \
#指定mysql端口号成功连接数据库。开始新的学习篇章。