配置MYSQL YUM源
wget -P ./ http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
###################################下载mysql源安装包# [root@iZbp1j6oiamq7t2otpryarZ data]# wget -P ./ http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm --2017-11-02 13:04:56-- http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm Resolving dev.mysql.com (dev.mysql.com)... 137.254.60.11 Connecting to dev.mysql.com (dev.mysql.com)|137.254.60.11|:80... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm [following] --2017-11-02 13:04:57-- https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm Connecting to dev.mysql.com (dev.mysql.com)|137.254.60.11|:443... connected. HTTP request sent, awaiting response... 302 Found Location: https://repo.mysql.com//mysql57-community-release-el7-8.noarch.rpm [following] --2017-11-02 13:04:59-- https://repo.mysql.com//mysql57-community-release-el7-8.noarch.rpm Resolving repo.mysql.com (repo.mysql.com)... 118.215.180.109 Connecting to repo.mysql.com (repo.mysql.com)|118.215.180.109|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 9116 (8.9K) [application/x-redhat-package-manager] Saving to: ‘./mysql57-community-release-el7-8.noarch.rpm’ 100%[===================================================================================================>] 9,116 --.-K/s in 0s 2017-11-02 13:04:59 (145 MB/s) - ‘./mysql57-community-release-el7-8.noarch.rpm’ saved [9116/9116] [root@iZbp1j6oiamq7t2otpryarZ data]# ll total 12 -rw-r--r-- 1 root root 9116 Apr 11 2016 mysql57-community-release-el7-8.noarch.rpm
####################################安装mysql源#
yum localinstall mysql57-community-release-el7-8.noarch.rpm
####################################安装mysql源# [root@iZbp1j6oiamq7t2otpryarZ data]# yum localinstall mysql57-community-release-el7-8.noarch.rpm Loaded plugins: fastestmirror Examining mysql57-community-release-el7-8.noarch.rpm: mysql57-community-release-el7-8.noarch Marking mysql57-community-release-el7-8.noarch.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package mysql57-community-release.noarch 0:el7-8 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================= Package Arch Version Repository Size ============================================================================================================================================= Installing: mysql57-community-release noarch el7-8 /mysql57-community-release-el7-8.noarch 8.2 k Transaction Summary ============================================================================================================================================= Install 1 Package Total size: 8.2 k Installed size: 8.2 k Is this ok [y/d/N]: y Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : mysql57-community-release-el7-8.noarch 1/1 Verifying : mysql57-community-release-el7-8.noarch 1/1 Installed: mysql57-community-release.noarch 0:el7-8 Complete! ####################################检查mysql源是否安装成功# [root@iZbp1j6oiamq7t2otpryarZ data]# yum repolist enabled | grep "mysql.*-community.*" mysql-connectors-community/x86_64 MySQL Connectors Community 42 mysql-tools-community/x86_64 MySQL Tools Community 51 mysql57-community/x86_64 MySQL 5.7 Community Server 227 ###########看到上面内容，表示安装成功。 #################################### # mysql源配置文件：/etc/yum.repos.d/mysql-community.repo # 比如要安装5.6版本，可将5.7源的enabled=1改成enabled=0。并将5.6源的enabled=0改成enabled=1即可。 #################################### [root@iZbp1j6oiamq7t2otpryarZ data]# cat /etc/yum.repos.d/mysql-community.repo [mysql-connectors-community] name=MySQL Connectors Community baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [mysql-tools-community] name=MySQL Tools Community baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql # Enable to use MySQL 5.5 [mysql55-community] name=MySQL 5.5 Community Server baseurl=http://repo.mysql.com/yum/mysql-5.5-community/el/7/$basearch/ enabled=0 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql # Enable to use MySQL 5.6 [mysql56-community] name=MySQL 5.6 Community Server baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/ enabled=0 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [mysql57-community] name=MySQL 5.7 Community Server baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [mysql-tools-preview] name=MySQL Tools Preview baseurl=http://repo.mysql.com/yum/mysql-tools-preview/el/7/$basearch/ enabled=0 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [root@iZbp1j6oiamq7t2otpryarZ data]#
安装MYSQL：
yum install mysql-community-server
yum install mysql-community-client
#################################### 安装MySQL #
[root@iZbp1j6oiamq7t2otpryarZ data]# yum install mysql-community-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 5.7.20-1.el7 for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 5.7.9 for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libaio.so.1(LIBAIO_0.4)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libaio.so.1(LIBAIO_0.1)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libaio.so.1()(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Running transaction check
---> Package libaio.x86_64 0:0.3.109-13.el7 will be installed
---> Package mysql-community-client.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-64) >= 5.7.9 for package: mysql-community-client-5.7.20-1.el7.x86_64
---> Package mysql-community-common.x86_64 0:5.7.20-1.el7 will be installed
--> Running transaction check
---> Package mariadb-libs.x86_64 1:5.5.52-1.el7 will be obsoleted
--> Processing Dependency: libmysqlclient.so.18()(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64
--> Processing Dependency: libmysqlclient.so.18(libmysqlclient_18)(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64
---> Package mysql-community-libs.x86_64 0:5.7.20-1.el7 will be obsoleting
--> Running transaction check
---> Package mysql-community-libs-compat.x86_64 0:5.7.20-1.el7 will be obsoleting
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================================================================================
Package Arch Version Repository Size
=============================================================================================================================================
Installing:
mysql-community-libs x86_64 5.7.20-1.el7 mysql57-community 2.1 M
replacing mariadb-libs.x86_64 1:5.5.52-1.el7
mysql-community-libs-compat x86_64 5.7.20-1.el7 mysql57-community 2.0 M
replacing mariadb-libs.x86_64 1:5.5.52-1.el7
mysql-community-server x86_64 5.7.20-1.el7 mysql57-community 164 M
Installing for dependencies:
libaio x86_64 0.3.109-13.el7 base 24 k
mysql-community-client x86_64 5.7.20-1.el7 mysql57-community 24 M
mysql-community-common x86_64 5.7.20-1.el7 mysql57-community 272 k
Transaction Summary
=============================================================================================================================================
Install 3 Packages (+3 Dependent packages)
Total download size: 192 M
Is this ok [y/d/N]: y
Downloading packages:
(1/6): libaio-0.3.109-13.el7.x86_64.rpm | 24 kB 00:00:00
warning: /var/cache/yum/x86_64/7/mysql57-community/packages/mysql-community-common-5.7.20-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Public key for mysql-community-common-5.7.20-1.el7.x86_64.rpm is not installed
(2/6): mysql-community-common-5.7.20-1.el7.x86_64.rpm | 272 kB 00:00:00
(3/6): mysql-community-libs-5.7.20-1.el7.x86_64.rpm | 2.1 MB 00:00:00
(4/6): mysql-community-libs-compat-5.7.20-1.el7.x86_64.rpm | 2.0 MB 00:00:00
(5/6): mysql-community-client-5.7.20-1.el7.x86_64.rpm | 24 MB 00:00:08
(6/6): mysql-community-server-5.7.20-1.el7.x86_64.rpm | 164 MB 00:01:10
---------------------------------------------------------------------------------------------------------------------------------------------
Total 2.6 MB/s | 192 MB 00:01:13
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Importing GPG key 0x5072E1F5:
Userid : "MySQL Release Engineering <mysql-build@oss.oracle.com>"
Fingerprint: a4a9 4068 76fc bd3c 4567 70c8 8c71 8d3b 5072 e1f5
Package : mysql57-community-release-el7-8.noarch (installed)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : mysql-community-common-5.7.20-1.el7.x86_64 1/7
Installing : mysql-community-libs-5.7.20-1.el7.x86_64 2/7
Installing : mysql-community-client-5.7.20-1.el7.x86_64 3/7
Installing : libaio-0.3.109-13.el7.x86_64 4/7
Installing : mysql-community-server-5.7.20-1.el7.x86_64 5/7
Installing : mysql-community-libs-compat-5.7.20-1.el7.x86_64 6/7
Erasing : 1:mariadb-libs-5.5.52-1.el7.x86_64 7/7
Verifying : mysql-community-libs-5.7.20-1.el7.x86_64 1/7
Verifying : mysql-community-server-5.7.20-1.el7.x86_64 2/7
Verifying : mysql-community-common-5.7.20-1.el7.x86_64 3/7
Verifying : mysql-community-client-5.7.20-1.el7.x86_64 4/7
Verifying : mysql-community-libs-compat-5.7.20-1.el7.x86_64 5/7
Verifying : libaio-0.3.109-13.el7.x86_64 6/7
Verifying : 1:mariadb-libs-5.5.52-1.el7.x86_64 7/7
Installed:
mysql-community-libs.x86_64 0:5.7.20-1.el7 mysql-community-libs-compat.x86_64 0:5.7.20-1.el7 mysql-community-server.x86_64 0:5.7.20-1.el7
Dependency Installed:
libaio.x86_64 0:0.3.109-13.el7 mysql-community-client.x86_64 0:5.7.20-1.el7 mysql-community-common.x86_64 0:5.7.20-1.el7
Replaced:
mariadb-libs.x86_64 1:5.5.52-1.el7
Complete!
启动MYSQL服务
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl start mysqld
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2017-11-02 13:23:48 CST; 18s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 23892 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
Process: 23818 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 23895 (mysqld)
CGroup: /system.slice/mysqld.service
└─23895 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
Nov 02 13:23:42 iZbp1j6oiamq7t2otpryarZ systemd[1]: Starting MySQL Server...
Nov 02 13:23:48 iZbp1j6oiamq7t2otpryarZ systemd[1]: Started MySQL Server.
开机启动
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl enable mysqld
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl daemon-reload
停止MYSQL服务
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl stop mysqld
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: inactive (dead) since Thu 2017-11-02 13:31:35 CST; 5s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Main PID: 23895 (code=exited, status=0/SUCCESS)
Nov 02 13:23:42 iZbp1j6oiamq7t2otpryarZ systemd[1]: Starting MySQL Server...
Nov 02 13:23:48 iZbp1j6oiamq7t2otpryarZ systemd[1]: Started MySQL Server.
Nov 02 13:31:33 iZbp1j6oiamq7t2otpryarZ systemd[1]: Stopping MySQL Server...
Nov 02 13:31:35 iZbp1j6oiamq7t2otpryarZ systemd[1]: Stopped MySQL Server.
[root@iZbp1j6oiamq7t2otpryarZ data]# 更改数据文件位置：
将/var/lib下的mysql目录，mv（移动）到/data目录下：
为什么要用mv命令，而不用cp命令呢？应为linux文件系统特殊性，mv命令能保留文件的所有属性和权限，尤其是selinux属性。如果用cp命令，就需要回头再去设置mysql文件夹的selinux属性，本人因很头疼selinux故能避则避。
[root@iZbp1j6oiamq7t2otpryarZ data]# mv /var/lib/mysql /data/mysql
[root@iZbp1j6oiamq7t2otpryarZ data]# ll
total 12
drwxr-x--x 5 mysql mysql 314 Nov 2 13:31 mysql
-rw-r--r-- 1 root root 9116 Apr 11 2016 mysql57-community-release-el7-8.noarch.rpm
[root@iZbp1j6oiamq7t2otpryarZ data]# 修改mysql配置文件/etc/my.cnf。将datadir和socket的路径改为/data目录下：
[root@iZbp1j6oiamq7t2otpryarZ data]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@iZbp1j6oiamq7t2otpryarZ data]# vi /etc/my.cnf
[root@iZbp1j6oiamq7t2otpryarZ data]# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/data/mysql
socket=/data/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[root@iZbp1j6oiamq7t2otpryarZ data]# 然后重新启动mysql服务 ：
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl restart mysqld
[root@iZbp1j6oiamq7t2otpryarZ data]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2017-11-02 13:40:54 CST; 5s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 24037 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
Process: 24019 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Main PID: 24040 (mysqld)
CGroup: /system.slice/mysqld.service
└─24040 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
Nov 02 13:40:53 iZbp1j6oiamq7t2otpryarZ systemd[1]: Starting MySQL Server...
Nov 02 13:40:54 iZbp1j6oiamq7t2otpryarZ systemd[1]: Started MySQL Server.
[root@iZbp1j6oiamq7t2otpryarZ data]# 修改ROOT本地登录密码
mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码，然后登录mysql进行修改：
[root@iZbp1j6oiamq7t2otpryarZ data]# grep 'temporary password' /var/log/mysqld.log
2017-11-02T05:23:44.524190Z 1 [Note] A temporary password is generated for root@localhost: MyOldPass123!
[root@iZbp1j6oiamq7t2otpryarZ data]# [root@iZbp1j6oiamq7t2otpryarZ data]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.7.20
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql>
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass123!'; 或者
mysql> set password for 'root'@'localhost'=password('MyNewPass123!');注意：
mysql5.7默认安装了密码安全检查插件（validate_password），默认密码检查策略要求密码必须包含：大小写字母、数字和特殊符号，并且长度不能少于8位，否则会提示：mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'gq123!mysql'; ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
通过msyql环境变量可以查看密码策略的相关信息：
mysql> show variables like '%password%';
+---------------------------------------+--------+
| Variable_name | Value |
+---------------------------------------+--------+
| default_password_lifetime | 0 |
| disconnect_on_expired_password | ON |
| log_builtin_as_identified_by_password | OFF |
| mysql_native_password_proxy_users | OFF |
| old_passwords | 0 |
| report_password | |
| sha256_password_proxy_users | OFF |
| validate_password_check_user_name | OFF |
| validate_password_dictionary_file | |
| validate_password_length | 8 |
| validate_password_mixed_case_count | 1 |
| validate_password_number_count | 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | 1 |
+---------------------------------------+--------+
14 rows in set (0.00 sec)
mysql> validate_password_policy：密码策略，默认为MEDIUM策略
validate_password_dictionary_file：密码策略文件，策略为STRONG才需要
validate_password_length：密码最少长度
validate_password_mixed_case_count：大小写字符长度，至少1个
validate_password_number_count ：数字至少1个
validate_password_special_char_count：特殊字符至少1个
上述参数是默认策略MEDIUM的密码检查规则。
共有以下几种密码策略：
| 策略 | 检查规则 |
|---|---|
| 0 or LOW | Length |
| 1 or MEDIUM | Length; numeric, lowercase/uppercase, and special characters |
| 2 or STRONG | Length; numeric, lowercase/uppercase, and special characters; dictionary file |
MySQL官网密码策略详细说明：
http://dev.mysql.com/doc/refman/5.7/en/validate-password-options-variables.html#sysvar_validate_password_policy
修改密码策略
在/etc/my.cnf文件添加validate_password_policy配置，指定密码策略
# 选择0（LOW），1（MEDIUM），2（STRONG）其中一种，选择2需要提供密码字典文件
validate_password_policy=0如果不需要密码策略，添加my.cnf文件中添加如下配置禁用即可：
validate_password = off重新启动mysql服务使配置生效：
systemctl restart mysqld添加远程登录用户
默认只允许root帐户在本地登录，如果要在其它机器上连接mysql，必须修改root允许远程连接，或者添加一个允许远程连接的帐户，为了安全起见，我添加一个新的帐户：
mysql> GRANT ALL PRIVILEGES ON *.* TO 'yuanchengyonghu'@'%' IDENTIFIED BY 'MyNewPass123' WITH GRANT OPTION;配置默认编码为UTF8
修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置，如下所示：
#在[mysqld]下添加如下内容#
character_set_server=utf8
init_connect='SET NAMES utf8'设置MYSQL大小不敏感
lower_case_table_names=1设置最大连接数及超时时间
max_connections=1000
#max_user_connections=500
wait_timeout=2880重新启动mysql服务，查看数据库默认编码如下：
[root@iZbp1j6oiamq7t2otpryarZ data]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 5
Server version: 5.7.20 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> show variables like '%character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)
mysql> 默认配置文件路径：
配置文件：/etc/my.cnf
日志文件：/var/log/var/log/mysqld.log
服务启动脚本：/usr/lib/systemd/system/mysqld.service
socket文件：/var/run/mysqld/mysqld.pid