mysql8初始化密码是哪个

小鱼儿 2023-09-25 10:41 17阅读 0赞

## linux 用rpm安装完成mysql后怎么进行初始化 ##

如果/etc/目录下没有my.cnf配置文件，请到/usr/share/mysql/下找到\*.cnf文件，拷贝其中一个到/etc/并改名为my.cnf中;不存在启动不了的情况啊，如有启动不了，仔细查看你的my.cnf文件，是不是哪里配置需要修改，然后查看一下mysql启动脚本/etc/rc.d/init.d/mysql。最重要的结合你mysql的错误日志去分析。设置默认utf-8在文件my.cnf中加上如下配置：\[mysqld\]init\_connect = 'SET NAMESutf8'character-set-server = utf8collation-server =utf8\_general\_ci在创建数据库完成后，最好查看下你数据库的字符集是什么？用show create database test;命令可以看到。必须保证你数据库的编码格式是utf-8的，这样才可以保证插入到数据库中的是中文格式的

![mysql8初始化密码是哪个\_mysql8初始化][mysql8_mysql8]

## 怎么配置mysql初始化化配置文件 ##

一、mysql\_install\_db说明

当MySQL的系统库(mysql系统库)发生故障或需要新加一个mysql实例时，需要初始化mysql数据库。

需要使用的命令：/usr/local/mysql/bin/mysql\_install\_db

\#/usr/local/mysql/bin/mysql\_install\_db--help可以查看帮助信息如下

Usage:/usr/local/mysql/bin/mysql\_install\_db\[OPTIONS\]

\--basedir=pathThepathtotheMySQLinstallationdirectory.

\--cross-bootstrapForinternaluse.UsedwhenbuildingtheMySQLsystem

tablesonadifferenthostthanthetarget.

\--datadir=pathThepathtotheMySQLdatadirectory.

\--forceCausesmysql\_install\_dbtorunevenifDNSdoesnot

work.Inthatcase,granttableentriesthatnormally

usehostnameswilluseIPaddresses.

\--ldata=pathThepathtotheMySQLdatadirectory.

\--rpmForinternaluse.ThisoptionisusedbyRPMfiles

duringtheMySQLinstallationprocess.

\--skip-name-resolveUseIPaddressesratherthanhostnameswhencreating

granttableentries.Thisoptioncanbeusefulif

yourDNSdoesnotwork.

\--srcdir=pathForinternaluse.Thedirectoryunderwhich

mysql\_install\_dblooksforsupportfilessuchasthe

errormessagefileandthefileforpopoulatingthe

helptables.

\--user=user\_nameTheloginusernametouseforrunningmysqld.Files

anddirectoriescreatedbymysqldwillbeownedbythis

user.Youmustberoottousethisoption.Bydefault

mysqldrunsusingyourcurrentloginnameandfilesand

directoriesthatitcreateswillbeownedbyyou.

Allotheroptionsarepassedtothemysqldprogram

除了支持以上的参数，还支持mysqld的参数。

二、举例：

本文以新加一个mysql实例为例。例如服务器上已经安装了3306端口的mysql服务，需要再启一个3308端口的mysql服务。

假设mysql安装在/usr/local/mysql路径下，找一个磁盘空间剩余比较大的盘，如/data1，把3308端口的mysql的数据保存在/data1下

\#mkdir/data1/mysql\_3308

\#mkdir/data1/mysql\_3308/data

\#chown-Rmysql:mysql/data1/mysql\_3308

复制一个mysql配置文件my.cnf到/data1/mysql\_3308目录下

\#vi/data1/mysql\_3308/my.cnf

修改配置文件，将端口和相关目录的都改为新的设置，如下：

\[client\]

character-set-server=utf8

port=3308

socket=/tmp/mysql\_3308.sock

\[mysqld\]

user=mysql

port=3308

socket=/tmp/mysql\_3308.sock

basedir=/usr/local/mysql

datadir=/data1/mysql\_3308/data

log-error=/data1/mysql\_3308/mysql\_error.log

pid-file=/data1/mysql\_3308/mysql.pid

......其他略

确保配置文件无误。

运行下面命令进行数据库的初始化：

\#/usr/local/mysql/bin/mysql\_install\_db--defaults-file=/data1/mysql\_3308/my.cnf--datadir=/data1/mysql\_3308/data

完成后新的3308数据库就初始化好了，如果有报错，则按照报错的提示查看报错日志，一般情况下都是my.cnf配置文件的问题，修正后即可。

三、启动新mysql

启动3308端口的mysql服务

\#/usr/local/mysql/bin/mysqld\_safe--defaults-file=/data1/mysql\_3309/my.cnf&

检查是否启动

\#psaux|grepmysql

如果有3308字样说明已经启动成功

可将启动命令加入/etc/rc.local随服务器启动

新加的mysql没有设置root密码，可以通过下面命令设置root密码：

\#/usr/local/mysql/bin/mysqladmin-S/tmp/mysql\_3308.sock-urootpassword'new-password'

本回答由提问者推荐

## 什么是初始化操作呢？、 ##

在输入数据部分还可以调用其他成员函数，：执行被测试函数前可能需要读取文件中的数据保存到成员变量，或需要连接数据库，老纳把这些操作称为初始化操作

![mysql8初始化密码是哪个\_mysql8初始化\_02][mysql8_mysql8_02]

## 系统初始化电脑系统初始化编辑系统初始化什么是什么？系统初始化电脑 ##

系统初始化电脑系统初始化编辑系统初始化什么是系统初始化对于新使用的硬盘，或者想改变设置重新使用的硬盘，在使用之前必须作初始化工作

## 怎么配置mysql初始化化配置文件 ##

一、mysql\_install\_db说明

当MySQL的系统库(mysql系统库)发生故障或需要新加一个mysql实例时，需要初始化mysql数据库。

需要使用的命令：/usr/local/mysql/bin/mysql\_install\_db

\#/usr/local/mysql/bin/mysql\_install\_db --help 可以查看帮助信息如下

Usage: /usr/local/mysql/bin/mysql\_install\_db \[OPTIONS\]

\--basedir=pathThe path to the MySQL installation directory.

\--cross-bootstrapFor internal use. Used when building the MySQL system

tables on a different host than the target.

\--datadir=pathThe path to the MySQL data directory.

\--forceCauses mysql\_install\_db to run even if DNS does not

work. In that case, grant table entries that normally

use hostnames will use IP addresses.

\--ldata=pathThe path to the MySQL data directory.

\--rpmFor internal use. This option is used by RPM files

during the MySQL installation process.

\--skip-name-resolve Use IP addresses rather than hostnames when creating

grant table entries. This option can be useful if

your DNS does not work.

\--srcdir=pathFor internal use. The directory under which

mysql\_install\_db looks for support files such as the

error message file and the file for popoulating the

help tables.

\--user=user\_nameThe login username to use for running mysqld. Files

and directories created by mysqld will be owned by this

user. You must be root to use this option. By default

mysqld runs using your current login name and files and

directories that it creates will be owned by you.

All other options are passed to the mysqld program

除了支持以上的参数，还支持mysqld的参数。

二、举例：

本文以新加一个mysql实例为例。例如服务器上已经安装了3306端口的mysql服务，需要再启一个3308端口的mysql服务。

假设mysql安装在/usr/local/mysql路径下，找一个磁盘空间剩余比较大的盘，如/data1，把3308端口的mysql的数据保存在/data1下

\#mkdir /data1/mysql\_3308

\#mkdir /data1/mysql\_3308/data

\#chown -R mysql:mysql /data1/mysql\_3308

复制一个mysql配置文件my.cnf到/data1/mysql\_3308目录下

\#vi /data1/mysql\_3308/my.cnf

修改配置文件，将端口和相关目录的都改为新的设置，如下：

\[client\]

character-set-server = utf8

port= 3308

socket = /tmp/mysql\_3308.sock

\[mysqld\]

user= mysql

port= 3308

socket = /tmp/mysql\_3308.sock

basedir = /usr/local/mysql

datadir = /data1/mysql\_3308/data

log-error = /data1/mysql\_3308/mysql\_error.log

pid-file = /data1/mysql\_3308/mysql.pid

......其他略

确保配置文件无误。

运行下面命令进行数据库的初始化：

\#/usr/local/mysql/bin/mysql\_install\_db --defaults-file=/data1/mysql\_3308/my.cnf --datadir=/data1/mysql\_3308/data

完成后新的3308数据库就初始化好了，如果有报错，则按照报错的提示查看报错日志，一般情况下都是my.cnf配置文件的问题，修正后即可。

三、启动新mysql

启动3308端口的mysql服务

\#/usr/local/mysql/bin/mysqld\_safe --defaults-file=/data1/mysql\_3309/my.cnf &

检查是否启动

\#ps aux|grep mysql

如果有3308字样说明已经启动成功

可将启动命令加入/etc/rc.local随服务器启动

新加的mysql没有设置root密码，可以通过下面命令设置root密码：

\#/usr/local/mysql/bin/mysqladmin -S /tmp/mysql\_3308.sock -u root password 'new-password'

![mysql8初始化密码是哪个\_mysql8初始化\_03][mysql8_mysql8_03]

## Mysql数据库无法初始化 ##

检查my.ini配置文件的两个路径是否配置正确

一、mysql\_install\_db说明

当mysql的系统库(mysql系统库)发生故障或需要新加一个mysql实例时，需要初始化mysql数据库。

需要使用的命令：/usr/local/mysql/bin/mysql\_install\_db

\#/usr/local/mysql/bin/mysql\_install\_db --help 可以查看帮助信息如下

usage: /usr/local/mysql/bin/mysql\_install\_db \[options\]

\--basedir=paththe path to the mysql installation directory.

\--cross-bootstrapfor internal use. used when building the mysql system

tables on a different host than the target.

\--datadir=paththe path to the mysql data directory.

\--forcecauses mysql\_install\_db to run even if dns does not

work. in that case, grant table entries that normally

use hostnames will use ip addresses.

\--ldata=paththe path to the mysql data directory.

\--rpmfor internal use. this option is used by rpm files

during the mysql installation process.

\--skip-name-resolve use ip addresses rather than hostnames when creating

grant table entries. this option can be useful if

your dns does not work.

\--srcdir=pathfor internal use. the directory under which

mysql\_install\_db looks for support files such as the

error message file and the file for popoulating the

help tables.

\--user=user\_namethe login username to use for running mysqld. files

and directories created by mysqld will be owned by this

user. you must be root to use this option. by default

mysqld runs using your current login name and files and

directories that it creates will be owned by you.

all other options are passed to the mysqld program

除了支持以上的参数，还支持mysqld的参数。

二、举例：

本文以新加一个mysql实例为例。例如服务器上已经安装了3306端口的mysql服务，需要再启一个3308端口的mysql服务。

假设mysql安装在/usr/local/mysql路径下，找一个磁盘空间剩余比较大的盘，如/data1，把3308端口的mysql的数据保存在/data1下

\#mkdir /data1/mysql\_3308

\#mkdir /data1/mysql\_3308/data

\#chown -r mysql:mysql /data1/mysql\_3308

复制一个mysql配置文件my.cnf到/data1/mysql\_3308目录下

\#vi /data1/mysql\_3308/my.cnf

修改配置文件，将端口和相关目录的都改为新的设置，如下：

\[client\]

character-set-server = utf8

port= 3308

socket = /tmp/mysql\_3308.sock

\[mysqld\]

user= mysql

port= 3308

socket = /tmp/mysql\_3308.sock

basedir = /usr/local/mysql

datadir = /data1/mysql\_3308/data

log-error = /data1/mysql\_3308/mysql\_error.log

pid-file = /data1/mysql\_3308/mysql.pid

......其他略

确保配置文件无误。

运行下面命令进行数据库的初始化：

\#/usr/local/mysql/bin/mysql\_install\_db --defaults-file=/data1/mysql\_3308/my.cnf --datadir=/data1/mysql\_3308/data

完成后新的3308数据库就初始化好了，如果有报错，则按照报错的提示查看报错日志，一般情况下都是my.cnf配置文件的问题，修正后即可。

三、启动新mysql

启动3308端口的mysql服务

\#/usr/local/mysql/bin/mysqld\_safe --defaults-file=/data1/mysql\_3309/my.cnf &

检查是否启动

\#ps aux|grep mysql

如果有3308字样说明已经启动成功

可将启动命令加入/etc/rc.local随服务器启动

新加的mysql没有设置root密码，可以通过下面命令设置root密码：

\#/usr/local/mysql/bin/mysqladmin -s /tmp/mysql\_3308.sock -u root password 'new-password'

[mysql8_mysql8]: https://img1.baidu.com/it/u=4011473932,1354435764&fm=26&fmt=auto
[mysql8_mysql8_02]: https://img0.baidu.com/it/u=4080252773,2414682624&fm=26&fmt=auto
[mysql8_mysql8_03]: https://img1.baidu.com/it/u=1329637782,3510355638&fm=26&fmt=auto