基于docker实现MySQL主从同步

事前准备

事前需要准备docker环境，MySQL5.6的镜像

我在这里就省略了，有不会的可以看我以前的文章。

准备配置文件

主库和从库的配置文件不同，这里分别准备好

sudo mkdir -p /usr/local/mysqlData/master/cnf
sudo mkdir -p /usr/local/mysqlData/master/data
sudo mkdir -p /usr/local/mysqlData/slave/cnf
sudo mkdir -p /usr/local/mysqlData/slave/data
sudo touch /usr/local/mysqlData/master/cnf/mysql.cnf
sudo touch /usr/local/mysqlData/slave/cnf/mysql.cnf

master

[mysqld]
pid-file    = /var/run/mysqld/mysqld.pid
socket    = /var/run/mysqld/mysqld.sock
datadir    = /var/lib/mysql

symbolic-links=0

character-set-server = utf8
#skip-networking
innodb_print_all_deadlocks = 1
max_connections = 2000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 28M
key_buffer_size = 4M

thread_cache_size = 8

query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M

ft_min_word_len = 4

log-bin = mysql-bin
server-id = 1
binlog_format = mixed

performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

interactive_timeout = 28800
wait_timeout = 28800

# Recommended in standard MySQL setup

sql_mode=NO_ENGINE_SUBSTITUTION,NO_AUTO_CREATE_USER,STRICT_TRANS_TABLES

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M

slave

[mysqld]
pid-file    = /var/run/mysqld/mysqld.pid
socket    = /var/run/mysqld/mysqld.sock
datadir    = /var/lib/mysql

symbolic-links=0

character-set-server = utf8
#skip-networking
innodb_print_all_deadlocks = 1
max_connections = 2000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 28M
key_buffer_size = 4M

thread_cache_size = 8

query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M

ft_min_word_len = 4

log-bin = mysql-bin
server-id = 2
binlog_format = mixed

performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

interactive_timeout = 28800
wait_timeout = 28800

# Recommended in standard MySQL setup

sql_mode=NO_ENGINE_SUBSTITUTION,NO_AUTO_CREATE_USER,STRICT_TRANS_TABLES

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M

大致写成这样就能用了

启动容器

master容器启用
sudo 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:5.6

slave容器启用
sudo docker run -itd -p 3308:3306 --name slave -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:5.6

数据库容器访问权限

防火墙设置允许端口访问
sudo firewall-cmd --add-port=3307/tcp --permanent
sudo firewall-cdm --add-port=3308/tcp --permanent
sudo firewall-cmd --reload

设置master数据库访问权限（进入主库容器里）
mysql -uroot -p123456
grant all privileges on *.* to reader@'%' identified by 'readerpwd' with grant option;
flush privileges;

设置slave数据库访问权限（进入从库容器里）
mysql -uroot -p123456
grant all privileges on *.* to slave@'%' identified by 'slavepwd' with grant option;
flush privileges;

设置主从同步

登录master数据库查看master状态
show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |      204 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
注意这里的mysql-bin.000002，后面同步数据时会用到

配置slave
change master to master_host='172.17.0.6',master_user='reader',master_password='readerpwd',master_log_file='mysql-bin.000002',master_log_pos=501;
	参数说明
	master_host，master数据库的ip地址
	master_user，连接master数据库的用户名
	master_password，master_user的密码
	master_log_file，日志文件，上一步中，master status对应的文件
启动slave,slave的操作有几个，start,stop和restart
start slave;
查看slave状态
show slave status;

然后就完事了