原文章:大佬的很不错,确实帮到了我。但有些小的出入所以我打算转过来并针对我遇到的情况修改下

linux安装mysql详细步骤

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-5.7.21-linux-glibc2.12-x86_64.tar.gz文件到/software下

 

#cd /software/

#tar -zxvf mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz

 

3、更改解压缩后的文件夹名称

#mv /software/mysql-5.7.21-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,由于我买的腾讯云服务器centos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,后面介绍解决办法

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]
default-character-set=utf8
[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=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=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

例 #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)

 

(在这一步之后我启动mysql还是失败了,提示不能读取/etc/my.cnf.d)

[root@izwz92rgzhw9zg5mmgmgu2z bin]# /etc/init.d/mysqld start
my_print_defaults: Can't read dir of '/etc/my.cnf.d' (Errcode: 2 - No such file or directory)
my_print_defaults: [ERROR] Fatal error in defaults handling. Program aborted!
Starting MySQL.my_print_defaults: Can't read dir of '/etc/my.cnf.d' (Errcode: 2 - No such file or directory)
my_print_defaults: [ERROR] Fatal error in defaults handling. Program aborted!
my_print_defaults: Can't read dir of '/etc/my.cnf.d' (Errcode: 2 - No such file or directory)
my_print_defaults: [ERROR] Fatal error in defaults handling. Program aborted!
Logging to '/data/mysql/izwz92rgzhw9zg5mmgmgu2z.err'.
The server quit without updating PID file (/data/mysql/izwz[FAILED]zg5mmgmgu2z.pid).

解决办法:原地址
创建目录:
mkdir /etc/my.cnf.d/

[root@izwz92rgzhw9zg5mmgmgu2z bin]# mkdir /etc/my.cnf.d/

13、登录mysql

#/software/mysql/bin/mysql -u root –p

(在这我的也报错了,于是网上搜了下找到了跳过密码校验的方法,并把密码给改了)

[root@izwz92rgzhw9zg5mmgmgu2z bin]# /software/mysql/bin/mysql -u root –p
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

原解决地址 其实要的就是跳过密码校验进去。另外:

原文中的修改密码的那句sql不适用于5.7 但是评论区的大牛给了正解,所以讲下边的语句替换上边的第二句就ok了

原代码:

mysql> use mysql;
mysql> update user set password=password("你的新密码") where user="root";
mysql> flush privileges;
mysql> quit
update mysql.user set authentication_string=password('你的新密码') where user='root';

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

(这一步也有下插曲,原因是上一步我根据网上的方法修改密码并能成功登陆了,但是我按照惯例执行了下 show databases;)

报错了:我根据自己不太好的英文推断,还是要我重置下密码,有根据大佬下面的步骤执行了下。就好了

mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

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

 

 

最后 登陆:原链接

1、登录MySQL数据库(mysql -hlocalhost -uroot -p)

mysql -hlocalhost -uroot -p
-h数据库主机
-u用户
-p密码
-P端口号(大写P)

例如:mysql -h127.0.0.1 -uroot -p123456 -P3306
PS:-p密码部分,可以直接指定密码,如果不指定,会提示输入密码。

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