master1和master2做主高可用
node1和master1组成主从复制，读写分离
node2和master2组成主从复制，读写分离

下面给出配置文件

1. master1: /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/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 the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_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
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
default-authentication-plugin=mysql_native_password
character-set-server=utf8
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.socklog-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pidvalidate_password.check_user_name=OFF
validate_password.length=4
validate_password.mixed_case_count=0
validate_password.number_count=0
validate_password.policy=0
validate_password.special_char_count=0
#主从复制-主机21配置
# 主服务器唯一ID
server-id=21
# 启用二进制日志
log-bin=mysql-bin
# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=sys
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema
# 设置需要复制的数据库(可设置多个)
binlog-do-db=testdb
binlog-do-db=testdb2
binlog-do-db=testdb3
binlog-do-db=testdb4
# 设置logbin格式
binlog_format=STATEMENT
# 写入操作更新二进制日志文件
log-slave-updates
wait_timeout=31536000
interactive_timeout=31536000

2. node1: /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/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 the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_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
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
default-authentication-plugin=mysql_native_password
character-set-server=utf8
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.socklog-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pidvalidate_password.check_user_name=OFF
validate_password.length=4
validate_password.mixed_case_count=0
validate_password.number_count=0
validate_password.policy=0
validate_password.special_char_count=0
# 主从复制-从机26配置
# 从服务器唯一ID
server-id=26
# 启用中继日志
relay-log=mysql-relaywait_timeout=31536000
interactive_timeout=31536000

3. master2: /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/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 the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_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
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
default-authentication-plugin=mysql_native_password
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.socklog-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
character-set-server=utf8
validate_password.check_user_name=OFF
validate_password.length=4
validate_password.mixed_case_count=0
validate_password.number_count=0
validate_password.policy=0
validate_password.special_char_count=0#主从复制-主机22配置
# 主服务器唯一ID
server-id=22
# 启用二进制日志
log-bin=mysql-bin
# 设置不要复制的数据库(可设置多个)
binlog-ignore-db=sys
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema
# 设置需要复制的数据库(可设置多个)
binlog-do-db=testdb
binlog-do-db=testdb2
binlog-do-db=testdb3
binlog-do-db=testdb4
# 设置logbin格式
binlog_format=STATEMENT
# 写入操作更新二进制日志文件
log-slave-updates
wait_timeout=31536000
interactive_timeout=31536000

4. node2: /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/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 the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_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
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
default-authentication-plugin=mysql_native_password
character-set-server=utf8
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.socklog-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pidvalidate_password.check_user_name=OFF
validate_password.length=4
validate_password.mixed_case_count=0
validate_password.number_count=0
validate_password.policy=0
validate_password.special_char_count=0
# 主从复制-从机27配置
# 从服务器唯一ID
server-id=27
# 启用中继日志
relay-log=mysql-relay
wait_timeout=31536000
interactive_timeout=31536000
  1. 总结
    底层走的是binlog进行复制的。
    从库需要给从库账号和密码让其访问。

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