Docker部署MySQL8集群(一主二从)的实现步骤

yum install -y yum-utils

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

yum -y install docker-ce

docker -v
docker version

yum list installed | grep docker

docker pull mysql:8

docker images

# 创建主服务的配置目录和数据目录
mkdir -p /usr/local/mysqlData/master/cnf
mkdir -p /usr/local/mysqlData/master/data

# 创建1号从服务器的配置目录和数据目录
mkdir -p /usr/local/mysqlData/slave/cnf
mkdir -p /usr/local/mysqlData/slave/data

# 创建2号从服务器的配置目录和数据目录
mkdir -p /usr/local/mysqlData/slave2/cnf
mkdir -p /usr/local/mysqlData/slave2/data

vim /usr/local/mysqlData/master/cnf/mysql.cnf

[mysqld]
## 设置server_id,注意要唯一
server-id=1
## 开启binlog
log-bin=mysql-bin
## binlog缓存
binlog_cache_size=1M
## binlog格式(mixed、statement、row,默认格式是statement)
binlog_format=mixed
##设置字符编码为utf8mb4
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4

# 1号从服务器
vim /usr/local/mysqlData/slave/cnf/mysql.cnf
# 2号从服务器
vim /usr/local/mysqlData/slave2/cnf/mysql.cnf

[mysqld]
## 设置server_id,注意要唯一
server-id=2
## 开启binlog
log-bin=mysql-slave-bin
## relay_log配置中继日志
relay_log=edu-mysql-relay-bin
## 如果需要同步函数或者存储过程
log_bin_trust_function_creators=true
## binlog缓存
binlog_cache_size=1M
## binlog格式(mixed、statement、row,默认格式是statement)
binlog_format=mixed
##设置字符编码为utf8mb4
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
slave_skip_errors=1062
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4

# 主服务器实例化
docker run -itd -p 3307:3306 --name master -v /usr/local/mysqlData/master/cnf:/etc/mysql/conf.d -v /usr/local/mysqlData/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8 

# 1号从服务器实例化
docker run -itd -p 3308:3306 --name slaver -v /usr/local/mysqlData/slave/cnf:/etc/mysql/conf.d -v /usr/local/mysqlData/slave/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8 

# 2号从服务器实例化
docker run -itd -p 3309:3306 --name slaver2 -v /usr/local/mysqlData/slave2/cnf:/etc/mysql/conf.d -v /usr/local/mysqlData/slave2/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8

docker ps -a

# 创建用户 reader设置密码为reader
CREATE USER reader IDENTIFIED BY 'reader';
# 给予reader同步权限
GRANT REPLICATION SLAVE ON *.* to 'reader'@'%';
FLUSH PRIVILEGES;

# MySQL的连接信息
SHOW MASTER STATUS;

#新开连接 获取master实例的在docker的地址
docker inspect --format='{{.NetworkSettings.IPAddress}}' master

# 配置连接的参数
change master to master_host='172.17.0.2',master_user='reader',master_password='reader',master_log_file='mysql-bin.000003',master_log_pos=2259;
# 启动同步
start slave;
# 查看是否成功
show slave status\G

# 两项都为Yes时代表成功。
# Slave_IO_Running: Yes
# Slave_SQL_Running: Yes

# 失败需要使用停止连接后检查其他账号密码，地址，pos等参数

# 停止连接，如果一次成功无需使用该命令
stop slave;

SHOW SLAVE HOSTS;