1、为数据库创建软件目录以及数据存放目录

#mysql软件目录 
mkdir /software/ 
#mysql数据文件目录 
mkdir /data/mysql

2、上传mysql-XXXXXX.tar.gz文件到mysql软件安装目录下:

cd /software/ 
tar -zxvf mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz

  mysql的tar.gz的安装包可以去官网下载:https://dev.mysql.com/downloads/mysql/。

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
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

  保存并退出:

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

  保存并推出。

12、启动mysql

/etc/init.d/mysqld start 
#或者: 
systemctl restart mysqld

  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

/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


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