Docker搭建MySQL主从复制 - ToB企服应用市场:ToB评测及商务社交产业平台

# 创建mysql工作目录
[root@docker-01 ~]# mkdir mysql
[root@docker-01 ~]# cd mysql
# 创建mysql文件Dockerfile
[root@docker-01 mysql]# cat Dockerfile
# 指定基础镜像
FROM centos:7.6.1810
# 安装MySQL依赖软件，创建MySQL用户
RUN yum clean all && yum makecache && yum -y remove mariadb && yum -y install vim numactl wget net-tools lrzsz libaio gcc gcc-c++ net-tools && useradd -M -s /sbin/nologin mysql
# 开始安装MySQL
ADD mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz ./
RUN mv mysql-5.7.28-linux-glibc2.12-x86_64 /usr/local/mysql && mkdir /usr/local/mysql/data && chown -R mysql:mysql /usr/local/mysql/data/ && cd /usr/local/mysql/bin/ && ./mysqld --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --initialize &> /var/log/mysql_password.log
# 上传配置文件
COPY my.cnf /etc/my.cnf
RUN cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld && chmod +x /etc/rc.d/init.d/mysqld
# 上传系统服务文件
COPY mysql.service /lib/systemd/system/
ENV PATH /usr/local/mysql/bin:$PATH
EXPOSE 3306
# 创建mysql配置文件
[root@docker-01 mysql]# cat my.cnf
[client]
socket=/usr/local/mysql/data/mysql.sock
[mysqld]
socket=/usr/local/mysql/data/mysql.sock
# 绑定监听地址0.0.0.0
bind-address = 0.0.0.0
# 禁止域名解析,减少mysql对外部连接客户端DNS解析的时间
skip-name-resolve
# 设置端口为3306
port=3306
# 设置mysql的安装目录
basedir=/usr/local/mysql
# 设置mysql数据库的数据的存放目录
datadir=/usr/local/mysql/data
# 允许最大连接数
max_connections=2048
# 服务端使用的字符集默认为utf8
character-set-server=utf8
# 创建新表时将使用默认存储引擎
default-storage-engine=INNODB
# sql语句不区分大小写
lower_case_table_names=1
# 设置一次消息传输的最大值
max_allowed_packet=16M
# 创建mysql服务控制文件
[root@docker-01 mysql]# cat mysql.service
[Unit]
Description=mysqld
After=network.target
[Service]
Type=forking
ExecStart=/etc/rc.d/init.d/mysqld start
ExecReload=/etc/rc.d/init.d/mysqld restart
ExecStop=/etc/rc.d/init.d/mysqld stop
PrivateTmp=true
[Install]
WantedBy=multi-user.target
[root@docker-01 mysql]# ls
Dockerfile my.cnf mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz mysql.service
# 构建MySQl镜像
[root@docker-01 mysql]# docker build -t mysql:5.7.28 .

复制代码

[root@docker-01 ~]# mkdir systemctl
[root@docker-01 ~]# cd systemctl/
[root@docker-01 systemctl]# cat Dockerfile
# 基于刚刚的mysql镜像构建system镜像，作用是更好管理容器中的mysql服务
FROM mysql:5.7.28
ENV container docker
RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \
systemd-tmpfiles-setup.service ] || rm -f $i; done); \
rm -f /lib/systemd/system/multi-user.target.wants/*; \
rm -f /etc/systemd/system/*.wants/*; \
rm -f /lib/systemd/system/local-fs.target.wants/*; \
rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
rm -f /lib/systemd/system/basic.target.wants/*; \
rm -f /lib/systemd/system/anaconda.target.wants/*;
# 在容器创建一个挂载点，这个挂载点将会跟宿主机或者别的容器交互
VOLUME ["/sys/fs/cgroup"]
CMD ["/usr/sbin/init"]
# 构建systemctl镜像master
[root@docker-01 systemctl]# docker build -t system:master .
# 构建systemctl镜像slave
[root@docker-01 systemctl]# docker build -t system:slave .

复制代码

[root@docker-01 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
system master 20e2772fd585 47 hours ago 6.72GB
system slave 20e2772fd585 47 hours ago 6.72GB
mysql 5.7.28 9d559d0e3cf8 47 hours ago 6.72GB
centos 7.6.1810 f1cb7c7d58b7 5 years ago 202MB
# 创建master容器
[root@docker-01 ~]# docker run -d --hostname master --name master -p 13306:3306 --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro system:master
# 创建slave容器
[root@docker-01 ~]# docker run -d --hostname slave --name slave -p 23306:3306 --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro system:slave

复制代码

# 登录master容器
[root@docker-01 ~]# docker exec -it master bash
# 查看临时mysql密码
[root@master /]# tail -1 /var/log/mysql_password.log
2024-05-25T04:21:20.466885Z 1 [Note] A temporary password is generated for root@localhost: MD)M;qyC0r_0
# 设置主服务器ID
[root@master /]# cat >> /etc/my.cnf << EOF
server-id = 1
log-bin = master-bin #开启二进制日志
binlog_format = mixed
EOF
[root@master /]# systemctl start mysqld
[root@master /]# netstat -anpt
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 316/mysqld
# 登录数据库更改密码
[root@master /]# mysql -u root -p
Enter password: ## 输入临时密码
mysql> set password=password('wzh.2005');

复制代码

# 登录slave容器
[root@docker-01 ~]# docker exec -it slave bash
# 查看临时mysql密码
[root@slave /]# tail -1 /var/log/mysql_password.log
2024-05-25T04:21:20.466885Z 1 [Note] A temporary password is generated for root@localhost: MD)M;qyC0r_0
# 设置从服务器ID
[root@slave /]# cat >> /etc/my.cnf << EOF
server-id = 2 #需保证主库和从库的server_id不
relay-log = relay-log-bin #开启中继日志
relay-log-index = slave-relay-bin.index #中继日志开启索引
read_only=1
EOF
[root@slave /]# systemctl start mysqld
[root@slave /]# netstat -anpt
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 326/mysqld
# 登录数据库更改密码
[root@slave /]# mysql -u root -p
Enter password: ## 输入临时密码
mysql> set password=password('wzh.2005');

复制代码

# 给从服务器授权，允许使用myslave的身份复制master中的所有数据库的所有表数据，并指定密码为“wzh.2005”
[root@master /]# mysql -u root -pwzh.2005
mysql> grant replication slave on *.* to 'myslave'@'192.168.93.%' identified by 'wzh.2005';
# 两个容器之间使用172.17.0.0网段通信
mysql> grant replication slave on *.* to 'myslave'@'172.17.0.%' identified by 'wzh.2005';

复制代码

# 两个uuid保持不一样即可，修改过后别忘记重启mysql服务
[root@master /]# cat /usr/local/mysql/data/auto.cnf
[auto]
server-uuid=3ca0adc5-1a4e-11ef-9c25-0242ac110004
[root@slave /]# cat /usr/local/mysql/data/auto.cnf
[auto]
server-uuid=3ca0adc5-1a4e-11ef-9c25-0242ac110005

复制代码

[root@slave /]# mysql -u root -pwzh.2005
mysql> change master to master_host='192.168.93.165',master_port=13306,master_user='myslave',master_password='wzh.2005',master_log_file='master-bin.000001',master_log_pos=990;
mysql> start slave;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

复制代码

# 在主库创建kgc库
[root@master /]# mysql -u root -pwzh.2005
mysql> create database kgc;
# 从库查看是否同步主库kgc数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| kgc |
| mysql |
| performance_schema |
| sys |
+--------------------+

复制代码