innobackupex 备份数据搭建 MySQL Slave
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简介:
数据量比较大时,使用 innobackupex 备份数据新增 mysql Slave 节点。
安装 innobackupex 工具,我这里写过一次:http://www.cnblogs.com/wangxiaoqiangs/p/5961413.html
场景:
A -> B -> C -> D -> E
一、增加节点 C
# 由于有从库 B ,所以我们去 B 上面执行备份
shell > innobackupex --user=xx --password=xx --slave-info --safe-slave-backup --no-timestamp alldatabase
# 保存 B 的 Slave 信息,因为新增的节点 C 与 B 同级
shell > scp -r alldatabase mysql-nodeC:/root
# 将备份数据拷贝到新节点 C 上,如果节点 C 在外网,建议先压缩一下
# 登录节点 C
shell > vim /etc/my.cnf # 准备配置文件 [client] port = 3306 socket = /tmp/mysql.sock [mysqld] socket = /tmp/mysql.sock datadir = /data/mysql_data log-error = error.log skip-name-resolve skip-external-locking default-storage-engine = MyISAM key_buffer_size = 3072M sort_buffer_size = 256M read_buffer_size = 4M read_rnd_buffer_size = 8M myisam_sort_buffer_size = 128M table_open_cache = 1024 table_definition_cache = 1024 thread_cache_size = 8 back_log = 512 connect_timeout = 20 max_connections = 1500 wait_timeout = 120 interactive_timeout = 120 max_allowed_packet = 1024M slow_query_log = ON long_query_time = 2 slow-query-log-file = slow.log query_cache_type = 0 query_cache_size = 0 query_cache_limit = 0 tmp_table_size = 128M max_heap_table_size = 128M innodb_file_per_table = 0 innodb_buffer_pool_size = 1024M read-only = 1 relay-log = mysql-relay-bin expire_logs_days = 7 server-id = 1020
# 注意:server-id 必须全局唯一
# 如果新增的是节点 D,那么需要将后4行替换为如下7行
relay-log = mysql-relay-bin relay_log_purge = ON log-slave-updates = 1 log-bin = mysql-bin binlog_format = mixed expire_logs_days = 7 server-id = 1020
# 因为节点 D 不仅是 Master A 的 Slave,同时也是节点 E 的 Master
shell > innobackupex --apply-log alldatabase # 在备份目录上应用日志 161111 13:56:04 completed OK! shell > innobackupex --copy-back alldatabase # 将备份文件拷贝到 my.cnf 中 datadir 指定目录 161111 14:10:21 completed OK! shell > chown -R mysql.mysql /data/mysql_data shell > /etc/init.d/mysql.server start shell > cat /data/mysql_data/xtrabackup_slave_info # 记录 master_log_file 和 master_log_pos 的值 CHANGE MASTER TO MASTER_LOG_FILE=\'mysql-bin.003742\', MASTER_LOG_POS=1072788827 shell > mysql -uxx -pxx -A mysql> stop slave; mysql> reset slave all; mysql> change master to master_host=\'x.x.x.x\',master_user=\'xx\',master_password=\'xx\',master_log_file=\'mysql-bin.003742\',master_log_pos=1072788827; mysql> start slave; mysql> show slave status\\G Slave_IO_Running: Yes Slave_SQL_Running: Yes mysql> quit
# master_host=\'A\'
# MySQL Slave 节点 C 搭建完成
二、新增节点 E
# 由于节点 D 后面没有从节点,所以备份要在节点 D 上执行
shell > innobackupex --user=xx --password=xx --no-timestamp alldatabase
# 我们要的是节点 D 的信息,所以不需要保存 Slave 信息( Slave 信息为跟节点 A 同步信息 )
shell > scp -r alldatabase mysql-nodeE:/root
# 将备份数据拷贝到新节点 E 上,如果节点 E 在外网,建议先压缩一下
shell > mysql -uxx -pxx -A # 跟上面不一样的地方,需要新建立一个授权用户 mysql> grant replication slave on *.* to xx@\'%\' identified by \'xx\'; # 登录节点 E shell > vim /etc/my.cnf # 准备配置文件 [client] port = 3306 socket = /tmp/mysql.sock [mysqld] socket = /tmp/mysql.sock datadir = /data/mysql_data log-error = error.log skip-name-resolve skip-external-locking default-storage-engine = MyISAM key_buffer_size = 3072M sort_buffer_size = 256M read_buffer_size = 4M read_rnd_buffer_size = 8M myisam_sort_buffer_size = 128M table_open_cache = 1024 table_definition_cache = 1024 thread_cache_size = 8 back_log = 512 connect_timeout = 20 max_connections = 1500 wait_timeout = 120 interactive_timeout = 120 max_allowed_packet = 1024M slow_query_log = ON long_query_time = 2 slow-query-log-file = slow.log query_cache_type = 0 query_cache_size = 0 query_cache_limit = 0 tmp_table_size = 128M max_heap_table_size = 128M innodb_file_per_table = 0 innodb_buffer_pool_size = 1024M read-only = 1 relay-log = mysql-relay-bin expire_logs_days = 7 server-id = 10201
# 同样注意 server-id 全局唯一
shell > chown -R mysql.mysql /data/mysql_data shell > /etc/init.d/mysql.server start shell > cat /data/mysql_data/xtrabackup_info binlog_pos = filename \'mysql-bin.000001\', position \'112094418\' shell > mysql -uxx -pxx -A mysql> stop slave; mysql> reset slave all; mysql> change master to master_host=\'x.x.x.x\',master_user=\'rep\',master_password=\'xx\',master_log_file=\'mysql-bin.000001\',master_log_pos=112094418; mysql> start slave; mysql> show slave status\\G Slave_IO_Running: Yes Slave_SQL_Running: Yes mysql> quit
# master_host=\'D\'
# master_user=\'rep\' # 这里的用户密码,是节点 D 上的,并不是节点 A 上的
# MySQL Slave 节点 E 搭建完成
# 不采用 innobackupex 时,可以使用如下方法:
# stop slave;
# flush tables with read lock;
# show slave status\\G
# 记录 master_log_file,master_log_pos
# 新开一个终端,scp -r /data/mysql_data x.x.x.x:/data/mysql_data,拷贝完成就可以 unlock tables;
# chown -R mysql.mysql /data/mysql_data
# /etc/init.d/mysql.server start
# mysql -uxx -pxx -A
# chanage master to ...
# start slave;
# mysql.sock 如果放在 datadir 下,记得 chmod 755 /data/mysql_data,不然 zabbix_agentd 连接不到数据库
# End
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