mysql-5.7.22 主从同步

1.安装MySQL

1.1 更换源指定安装版本

wgethttp://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

yumlocalinstall mysql57-community-release-el7-8.noarch.rpm

yum repolist enabled | grep"mysql.*-community.*"

1.2 安装MySQL

yum install mysql-community-server

1.3 开启数据库，并找到指定密码登录，创建账号

systemctl start mysqld
grep 'temporary password' /var/log/mysqld.log  #初始密码
mysql -uroot -p
mysql>create user root;
mysql>grant all privileges on *.* to root@'%' identified by 'Juzi@2018';
mysql>flush peivileges;
mysql>exit
mysql -uroot -pJuzi@123  #重新登录

1.4 mysql5.7账号密码登录优化

在安装完成mysql5.7之后.登录会默认修改密码,修改密码过程中可能会报错,myslq5.7对密码有一定要求

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements  
#报错  这个其实与validate_password_policy的值有关

validate_password_policy有以下取值：

Policy	Tests Performed
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

默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。

有时候，只是为了自己测试，不想密码设置得那么复杂，譬如说，我只想设置root的密码为123456。

必须修改两个全局参数：

首先，修改validate_password_policy参数的值

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

这样，判断密码的标准就基于密码的长度了。这个由validate_password_length参数来决定

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          8 |
+----------------------------+
1 row in set (0.00 sec)

validate_password_length参数默认为8，它有最小值的限制，最小值为：

validate_password_number_count
+ validate_password_special_char_count
+ (2 * validate_password_mixed_case_count)

其中，validate_password_number_count指定了密码中数据的长度，validate_password_special_char_count指定了密码中特殊字符的长度，validate_password_mixed_case_count指定了密码中大小字母的长度。

这些参数，默认值均为1，所以validate_password_length最小值为4，如果你显性指定validate_password_length的值小于4，尽管不会报错，但validate_password_length的值将设为4。如下所示：

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          8 |
+----------------------------+
1 row in set (0.00 sec)

mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          4 |
+----------------------------+
1 row in set (0.00 sec)

如果修改了validate_password_number_count，validate_password_special_char_count，validate_password_mixed_case_count中任何一个值，则validate_password_length将进行动态修改。

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          4 |
+----------------------------+
row in set (0.00 sec)

mysql> select @@validate_password_mixed_case_count;
+--------------------------------------+
| @@validate_password_mixed_case_count |
+--------------------------------------+
|                                    1 |
+--------------------------------------+
row in set (0.00 sec)

mysql> set global validate_password_mixed_case_count=2;
Query OK, 0 rows affected (0.00 sec)

mysql> select @@validate_password_mixed_case_count;
+--------------------------------------+
| @@validate_password_mixed_case_count |
+--------------------------------------+
|                                    2 |
+--------------------------------------+
row in set (0.00 sec)

mysql> select @@validate_password_length;
+----------------------------+
| @@validate_password_length |
+----------------------------+
|                          6 |
+----------------------------+
row in set (0.00 sec)

当然，前提是validate_password插件必须已经安装，MySQL5.7是默认安装的。

那么如何验证validate_password插件是否安装呢？可通过查看以下参数，如果没有安装，则输出将为空。

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_dictionary_file    |       |
| validate_password_length             | 6     |
| validate_password_mixed_case_count   | 2     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
6 rows in set (0.00 sec

2.搭建主从

2.1修改主库配置文件

[root@5haocentos ~]# cat /etc/my.cnf
[mysqld]
server-id=1
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=33080
log-bin=mysql-bin
log-bin-index=master-bin.index
binlog_format=mixed
binlog-do-db=bgy
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema
#密码永久不过期配置
default_password_lifetime=0
#skip-grant-tables
symbolic-links=0


log-error=/var/log/mysqld.log
#pid-file=/var/run/mysqld/mysqld.pid
pid-file=/var/lib/mysql/mysqld.pid
wait_timeout=31536000
interactive_timeout=31536000

2.2登录创建备份账号 锁表

mysql>create user backup;
mysql>grant all privileges on *.* to 'backup'@'192.168.0.%' identified by 'Yuan@123';
mysql>flush privileges;
mysql>flush tables with read lock;  #锁表

2.3修改从库配置文件

[root@6haocentos ~]# cat /etc/my.cnf
[mysqld]
server-id=2
log-bin=mysql-bin
binlog_format=mixed
relay-log=slave-relay-bin
relay-log-index=slave-relay-bin.index
binlog-do-db=bgy
replicate_wild_ignore_table=mysql.%
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=33080
innodb_checksum_algorithm=innodb




symbolic-links=0


log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

2.4在从库上配置主库信息（根据个人设置 ）

mysql> reset maste;
mysql> change master to master_host='192.168.0.5',master_user='backup',master_password='****',master_log_file='mysql-bin.000006',master_log_pos='154',master_port=3306;

2.5主库解锁

unlock tables

2.6开启主从 查看状态

mysql> start slave;
mysql>show slave status\G;

若出现

则主从搭建完成