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linux安装mysql8.0.19 linux 安装 mysql 8.0.19 详细步骤及问题解决办法

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最近买了个腾讯云服务器,搭建环境。

该笔记用于系统上未装过mysql的干净系统第一次安装mysql。自己指定安装目录,指定数据文件目录。

linux系统版本: CentOS 7.3 64位

安装源文件版本:mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz

mysql安装位置:/software/mysql

数据库文件数据位置:/data/mysql

注:未防止混淆,这里都用绝对路径执行命令

        除了文件内容中的#,这里所有带#都是linux命令

  >mysql 是mysql的命令

步骤:

1、在根目录下创建文件夹software和数据库数据文件/data/mysql

#mkdir /software/
#mkdir /data/mysql

2、上传mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz文件到/software下

--------------------

这里我下载的带了router和test的mysql-8.0.19-linux-glibc2.12-x86_64.tar文件,所以多一部解压xz

--------------------
#cd /software/
#xz -d mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
#tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar

3、更改解压缩后的文件夹名称

#mv /software/mysql-8.0.19-linux-glibc2.12-x86_64/ /software/mysql

4、创建mysql用户组和mysql用户

#groupadd mysql

#useradd -r -g mysql mysql

5、关联myql用户到mysql用户组中

#chown -R mysql:mysql /software/mysql/
#chown -R mysql:mysql /data/mysql/
#chown -R mysql /software/mysql/
#chown -R mysql /data/mysql

6、更改mysql安装文件夹mysql/的权限

#chmod -R 755 /software/mysql/

7、安装libaio依赖包,系统自带的有这个依赖包所以不需要安装,不过自带的依赖包会报错

查询是否暗转libaio依赖包

#yum search libaio

如果没安装,可以用下面命令安装

#yum install libaio

8、初始化mysql命令

#cd /software/mysql/bin
#./mysqld --user=mysql --basedir=/software/mysql --datadir=/data/mysql --initialize

在执行上面命令时特别要注意一行内容  

[Note] A temporary password is generated for root@localhost: o*s#gqh)F4Ck

root@localhost: 后面跟的是mysql数据库登录的临时密码,各人安装生成的临时密码不一样

如果初始化时报错如下:

error while loading shared libraries: libnuma.so.1: cannot open shared objec

是因为libnuma安装的是32位,我们这里需要64位的,执行下面语句就可以解决

#yum install numactl.x86_64

执行完后重新初始化mysql命令

9、启动mysql服务

# sh /software/mysql/support-files/mysql.server start

上面启动mysql服务命令是会报错的,因为没有修改mysql的配置文件,报错内容大致如下:

./support-files/mysql.server: line 239: my_print_defaults: command not found

./support-files/mysql.server: line 259: cd: /usr/local/mysql: No such file or directory

Starting MySQL ERROR! Couldn't find MySQL server (/usr/local/mysql/bin/mysqld_safe)

10、修改Mysql配置文件

#vim /software/mysql/support-files/mysql.server

修改前

if test -z "$basedir"
then
basedir=/usr/local/mysql
bindir=/usr/local/mysql/bin
if test -z "$datadir"
then
datadir=/usr/local/mysql/data
fi
sbindir=/usr/local/mysql/bin
libexecdir=/usr/local/mysql/bin
else
bindir="$basedir/bin"
if test -z "$datadir"
then
datadir="$basedir/data"
fi
sbindir="$basedir/sbin"
libexecdir="$basedir/libexec"
fi

修改后

if test -z "$basedir"
then
basedir=/software/mysql
bindir=/software/mysql/bin
if test -z "$datadir"
then
datadir=/data/mysql
fi
sbindir=/software/mysql/bin
libexecdir=/software/mysql/bin
else
bindir="$basedir/bin"
if test -z "$datadir"
then
datadir="$basedir/data"
fi
sbindir="$basedir/sbin"
libexecdir="$basedir/libexec"
fi

保存退出

#cp /software/mysql/support-files/mysql.server /etc/init.d/mysqld

#chmod 755 /etc/init.d/mysqld

11、修改my.cnf文件

#vi /etc/my.cnf

将下面内容复制替换当前的my.cnf文件中的内容

[client]
no-beep
socket =/software/mysql/mysql.sock
# pipe
# socket=0.0
port=3306
[mysql]
#原文的utf8指向UTF8MB3,后续版本要改为UTF8MB4,一步到位吧
default-character-set=UTF8MB4
[mysqld]
basedir=/software/mysql
datadir=/data/mysql
port=3306
pid-file=/software/mysql/mysqld.pid
#skip-grant-tables
skip-name-resolve
socket = /software/mysql/mysql.sock
character-set-server=utf8
default-storage-engine=INNODB
explicit_defaults_for_timestamp = true
# Server Id.
server-id=1
max_connections=2000
#query_cache_size在8.0版本已经移除,故注释
#query_cache_size=0
table_open_cache=2000
tmp_table_size=246M
thread_cache_size=300
#限定用于每个数据库线程的栈大小。默认设置足以满足大多数应用
thread_stack = 192k
key_buffer_size=512M
read_buffer_size=4M
read_rnd_buffer_size=32M
innodb_data_home_dir = /data/mysql
innodb_flush_log_at_trx_commit=0
innodb_log_buffer_size=16M
innodb_buffer_pool_size=256M
innodb_log_file_size=128M
innodb_thread_concurrency=128
innodb_autoextend_increment=1000
innodb_buffer_pool_instances=8
innodb_concurrency_tickets=5000
innodb_old_blocks_time=1000
innodb_open_files=300
innodb_stats_on_metadata=0
innodb_file_per_table=1
innodb_checksum_algorithm=0
back_log=80
flush_time=0
join_buffer_size=128M
max_allowed_packet=1024M
max_connect_errors=2000
open_files_limit=4161
#query_cache_type在8.0版本已经移除,故注释
#query_cache_type=0
sort_buffer_size=32M
table_definition_cache=1400
binlog_row_event_max_size=8K
sync_master_info=10000
sync_relay_log=10000
sync_relay_log_info=10000
#批量插入数据缓存大小,可以有效提高插入效率,默认为8M
bulk_insert_buffer_size = 64M
interactive_timeout = 120
wait_timeout = 120
log-bin-trust-function-creators=1
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#
# include all files from the config directory
#
!includedir /etc/my.cnf.d

保存退出

12、启动mysql

#/etc/init.d/mysqld start

新版本的安装包会报错,错误内容如下:

Starting MySQL.Logging to '/data/mysql/SZY.err'.
2018-07-02T10:09:03.779928Z mysqld_safe The file /usr/local/mysql/bin/mysqld
does not exist or is not executable. Please cd to the mysql installation
directory and restart this script from there as follows:
./bin/mysqld_safe&
See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information
ERROR! The server quit without updating PID file (/software/mysql/mysqld.pid).

因为新版本的mysql安全启动安装包只认/usr/local/mysql这个路径。

解决办法:

方法1、建立软连接

#cd /usr/local/mysql
#ln -s /sofware/mysql/bin/myslqd mysqld

方法2、修改mysqld_safe文件(有强迫症的同学建议这种,我用的这种)

# vim /software/mysql/bin/mysqld_safe

将所有的/usr/local/mysql改为/software/mysql

保存退出。(可以将这个文件拷出来再修改然后替换)

13、登录mysql

这里我登陆不了,被denny了,类似这样的错误:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)。

参考https://cloud.tencent.com/developer/article/1188636

改为这个操作:

1.停止mysql数据库

/etc/init.d/mysqld stop

 (或者直接 kill -9 [PID]  杀进程!)

2.执行如下命令

mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

3.使用root登录mysql数据库

mysql -u root mysql

4.更新root密码

最新版MySQL请采用如下SQL:

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'newpassword';

5.刷新权限

mysql> FLUSH PRIVILEGES;

6.退出mysql

mysql> quit

7.重启mysql

/etc/init.d/mysqld restart

8.使用root用户重新登录mysql

mysql -uroot -p
 Enter password: <输入新设的密码newpassword>
---------------------------------------------------------------------------------------------------------------------------
#/software/mysql/bin/mysql -u root –p

14、输入临时密码。临时密码就是第8条root@localhost:后面的内容

15、修改mysql的登录密码

>mysql set password=password('root');
>mysql grant all privileges on *.* to root@'%' identified by 'root';
>mysql flush privileges;

16、完成,此时mysql的登录名root  登录密码root

总结

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