本篇内容主要讲解“MySQL多主复制和MySQL Galera的安装部署方法”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MySQL多主复制和MySQL Galera的安装部署方法”吧!
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MySQL Galera介绍
特性简介
MySQL/Galera是MySQL/InnoDB的多主集群,有以下特性:
- 同步复制
- Active-active的多主拓扑结构
- 集群任意节点可以读和写
- 自动身份控制,失败节点自动脱离集群
- 自动节点接入
- 真正的基于”行”级别和ID检查的并行复制
- 无单点故障,易扩展
MySQL Galera安装
安装前准备
机器准备
G221 : 192.168.1.221 (Centos 6.4)
G222 : 192.168.1.222 (Centos 6.4)
G223 : 192.168.1.223 (Centos 6.4)
安装依赖
- 确认安装有gcc和gcc-c++的版本为至少4.4
# yum install gcc gcc-c++
- 确认安装有boost-devel的版本至少为1.4.1
# yum install boost-devel
- 安装scons check-devel openssl-devel
# yum install scons check-devel openssl-devel
MySQL Galera安装
安装含wsrep Patch的MySQL 5.5.29
# yum install libaio
# wget https://launchpad.net/codership-mysql/5.5/5.5.29-23.7.3/+download/mysql-5.5.29_wsrep_23.7.3-linux-x86_64.tar.gz
# tar zxvf mysql-5.5.29_wsrep_23.7.3-linux-x86_64.tar.gz
# # mv mysql-5.5.29_wsrep_23.7.3-linux-x86_64 /usr/local/mysql
# cd /usr/local/mysql/
# groupadd mysql
# useradd -r -g mysql mysql
# chown -R mysql:mysql .
# ./scripts/mysql_install_db --no-defaults --datadir=/usr/local/mysql/data --user=mysql
# chown -R root .
# chown -R mysql data
安装Galera复制插件
# wget https://launchpad.net/galera/2.x/23.2.4/+download/galera-23.2.4-src.tar.gz
# tar zxvf galera-23.2.4-src.tar.gz
# cd galera-23.2.4-src
# scons
# cp garb/garbd /usr/local/mysql/bin/
# cp libgalera_smm.so /usr/local/mysql/lib/plugin/
MySQL Galera配置
MySQL Galera配置例子:
# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
# mkdir -p /var/lib/mysql
# chown mysql:mysql /var/lib/mysql
# vi /etc/my.cnf
# cat /etc/my.cnf
[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
[mysqld_safe]
log-error = /var/lib/mysql/mysql.log
pid-file = /var/lib/mysql/mysql.pid
[mysqld]
wsrep_node_name = node1
wsrep_provider = /usr/local/mysql/lib/plugin/libgalera_smm.so
#wsrep_provider_options ='gcache.size=1G;socket.ssl_key=my_key;socket.ssl_cert=my_cert'
#wsrep_slave_threads=16
wsrep_sst_method = rsync
#wsrep_sst_auth=root:
port = 3306
socket = /var/lib/mysql/mysql.sock
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
default_storage_engine=InnoDB
#innodb_buffer_pool_size=1G
#innodb_log_file_size=256M
innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_flush_log_at_trx_commit=0
innodb_doublewrite=0
innodb_file_per_table=1
binlog_format=ROW
log-bin=mysql-bin
server-id=101
relay-log=mysql-relay-bin
#read_only=1
log-slave-updates=1
注: 可参考MySQL wsrep参数
MySQL Galera启动与关闭
初次启动:
[root@G221 ~]# /usr/local/mysql/bin/mysqld_safe --wsrep_cluster_address=gcomm:// >/dev/null &
或
[root@G221 ~]# service mysql start --wsrep_cluster_address=gcomm://
查看mysqld监听的端口:
[root@G221 ~]# netstat -plantu | grep mysqld
tcp 0 0 0.0.0.0:4567 0.0.0.0:* LISTEN 3656/mysqld
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 3656/mysqld
注:
1)”gcomm://”是特殊的地址,仅仅是galera cluster初始化启动时候使用,再次启动的时候需要使用具体的IP地址.
2) 端口4567是wsrep使用的默认端口.该端口的防火墙设置规则应该和3306的一样.
关闭:
[root@G221 ~]# /usr/local/mysql/bin/mysqladmin -uroot -p shutdown
MySQL Galera新节点
添加新节点
节点接入
添加新节点的时候,新接入的节点叫Joiner,给joiner提供复制的节点叫Donor.新的节点接入需要:
1) 安装带wsrep patch的MySQL版本
2) 安装Galera复制插件
3) 配置好新节点的MySQL(参考Donnor的my.cnf)
4) 配置或启动的gcomm://的地址是需要使用donnor的IP.
接入节点G222:
[root@G222 data]# /usr/local/mysql/bin/mysqld_safe --wsrep_cluster_address="gcomm://192.168.1.221:4567,192.168.1.223:4567" >/dev/null &
接入节点G223:
[root@G223 data]# service mysql start --wsrep_cluster_address="gcomm://192.168.1.221:4567,192.168.1.222:4567"
修改节点的wsrep_cluster_address修改wsrep_cluster_address有两种方式:1)使用新的wsrep_cluster_address重启节点:
[root@G221 data]# service mysql restart --wsrep_cluster_address="gcomm://192.168.1.222:4567,192.168.1.223:4567"
Shutting down MySQL.... SUCCESS!
Starting MySQL....... SUCCESS!
2)直接修改MySQL全局变量
mysql> SHOW VARIABLES LIKE 'wsrep_cluster_address';
+-----------------------+----------------------------+
| Variable_name | Value |
+-----------------------+----------------------------+
| wsrep_cluster_address | gcomm://192.168.1.222:4567 |
+-----------------------+----------------------------+
1 row in set (0.00 sec)
mysql> set global wsrep_cluster_address="gcomm://192.168.1.222:4567,192.168.1.223:4567"; Query OK, 0 rows affected (2.20 sec)
mysql> SHOW VARIABLES LIKE 'wsrep_cluster_address';
+-----------------------+-------------------------------------------------------+
| Variable_name | Value |
+-----------------------+-------------------------------------------------------+
| wsrep_cluster_address | gcomm://192.168.1.222:4567,192.168.1.223:4567 |
+-----------------------+-------------------------------------------------------+
1 row in set (0.00 sec)
MySQL Galera监控
查看相关变量
查看MySQL版本:
mysql> SHOW GLOBAL VARIABLES LIKE 'version';
+---------------+------------+
| Variable_name | Value |
+---------------+------------+
| version | 5.5.29-log |
+---------------+------------+
1 row in set (0.00 sec)
查看wsrep版本:
mysql> SHOW GLOBAL STATUS LIKE 'wsrep_provider_version';
+------------------------+------------+
| Variable_name | Value |
+------------------------+------------+
| wsrep_provider_version | 2.4(rXXXX) |
+------------------------+------------+
1 row in set (0.00 sec)
查看wsrep有关的所有变量:
mysql> SHOW VARIABLES LIKE 'wsrep%' \G
*************************** 1. row ***************************
Variable_name: wsrep_OSU_method
Value: TOI
*************************** 2. row ***************************
Variable_name: wsrep_auto_increment_control
Value: ON
*************************** 3. row ***************************
Variable_name: wsrep_causal_reads
Value: OFF
*************************** 4. row ***************************
Variable_name: wsrep_certify_nonPK
Value: ON
*************************** 5. row ***************************
Variable_name: wsrep_cluster_address
Value: gcomm://192.168.1.222:4567,192.168.1.223:4567
*************************** 6. row ***************************
Variable_name: wsrep_cluster_name
Value: my_wsrep_cluster
*************************** 7. row ***************************
Variable_name: wsrep_convert_LOCK_to_trx
Value: OFF
*************************** 8. row ***************************
Variable_name: wsrep_data_home_dir
Value: /usr/local/mysql/data/
*************************** 9. row ***************************
Variable_name: wsrep_dbug_option
Value:
*************************** 10. row ***************************
Variable_name: wsrep_debug
Value: OFF
*************************** 11. row ***************************
Variable_name: wsrep_drupal_282555_workaround
Value: OFF
*************************** 12. row ***************************
Variable_name: wsrep_forced_binlog_format
Value: NONE
*************************** 13. row ***************************
Variable_name: wsrep_log_conflicts
Value: OFF
*************************** 14. row ***************************
Variable_name: wsrep_max_ws_rows
Value: 131072
*************************** 15. row ***************************
Variable_name: wsrep_max_ws_size
Value: 1073741824
*************************** 16. row ***************************
Variable_name: wsrep_mysql_replication_bundle
Value: 0
*************************** 17. row ***************************
Variable_name: wsrep_node_address
Value:
*************************** 18. row ***************************
Variable_name: wsrep_node_incoming_address
Value: AUTO
*************************** 19. row ***************************
Variable_name: wsrep_node_name
Value: node1
*************************** 20. row ***************************
Variable_name: wsrep_notify_cmd
Value:
*************************** 21. row ***************************
Variable_name: wsrep_on
Value: ON
*************************** 22. row ***************************
Variable_name: wsrep_provider
Value: /usr/local/mysql/lib/plugin/libgalera_smm.so
*************************** 23. row ***************************
Variable_name: wsrep_provider_options
Value: base_host = 192.168.1.221; base_port = 4567; cert.log_conflicts = no; evs.causal_keepalive_period = PT1S; evs.debug_log_mask = 0x1; evs.inactive_check_period = PT0.5S; evs.inactive_timeout = PT15S; evs.info_log_mask = 0; evs.install_timeout = PT15S; evs.join_retrans_period = PT1S; evs.keepalive_period = PT1S; evs.max_install_timeouts = 1; evs.send_window = 4; evs.stats_report_period = PT1M; evs.suspect_timeout = PT5S; evs.use_aggregate = true; evs.user_send_window = 2; evs.version = 0; evs.view_forget_timeout = PT5M; gcache.dir = /usr/local/mysql/data/; gcache.keep_pages_size = 0; gcache.mem_size = 0; gcache.name = /usr/local/mysql/data//galera.cache; gcache.page_size = 128M; gcache.size = 128M; gcs.fc_debug = 0; gcs.fc_factor = 1; gcs.fc_limit = 16; gcs.fc_master_slave = NO; gcs.max_packet_size = 64500; gcs.max_throttle = 0.25; gcs.recv_q_hard_limit = 9223372036854775807; gcs.recv_q_soft_limit = 0.25; gcs.sync_donor = NO; gmcast.listen_addr = tcp://0.0.0.0:4567; gmcast.mcast_addr = ; gmcast.mcast_ttl = 1; gmcast.peer_timeout = PT3S; gmcast.time_wait = PT5S; gmcast.version = 0; ist.recv_addr = 192.168.1.221; pc.checksum = true; pc.ignore_quorum = false; pc.ignore_sb = false; pc.linger = PT20S; pc.npvo = false; pc.version = 0; pc.weight = 1; protonet.backend = asio; protonet.version = 0; replicator.causal_read_timeout = PT30S; replicator.commit_order = 3
*************************** 24. row ***************************
Variable_name: wsrep_recover
Value: OFF
*************************** 25. row ***************************
Variable_name: wsrep_replicate_myisam
Value: OFF
*************************** 26. row ***************************
Variable_name: wsrep_retry_autocommit
Value: 1
*************************** 27. row ***************************
Variable_name: wsrep_slave_threads
Value: 2
*************************** 28. row ***************************
Variable_name: wsrep_sst_auth
Value:
*************************** 29. row ***************************
Variable_name: wsrep_sst_donor
Value:
*************************** 30. row ***************************
Variable_name: wsrep_sst_donor_rejects_queries
Value: OFF
*************************** 31. row ***************************
Variable_name: wsrep_sst_method
Value: rsync
*************************** 32. row ***************************
Variable_name: wsrep_sst_receive_address
Value: AUTO
*************************** 33. row ***************************
Variable_name: wsrep_start_position
Value: 80cdd13d-8cf2-11e2-0800-e0817023b754:0
33 rows in set (0.00 sec)
状态监控
查看Galera集群状态:
mysql> show status like 'wsrep%';
+----------------------------+----------------------------------------------------------+
| Variable_name | Value |
+----------------------------+----------------------------------------------------------+
| wsrep_local_state_uuid | 80cdd13d-8cf2-11e2-0800-e0817023b754 |
| wsrep_protocol_version | 4 |
| wsrep_last_committed | 3 |
| wsrep_replicated | 3 |
| wsrep_replicated_bytes | 522 |
| wsrep_received | 6 |
| wsrep_received_bytes | 1134 |
| wsrep_local_commits | 1 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_avg | 0.000000 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_avg | 0.000000 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_cert_deps_distance | 1.000000 |
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 1.000000 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 1.000000 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 5 |
| wsrep_causal_reads | 0 |
| wsrep_incoming_addresses | 192.168.1.221:3306,192.168.1.222:3306,192.168.1.223:3306 |
| wsrep_cluster_conf_id | 13 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | 80cdd13d-8cf2-11e2-0800-e0817023b754 |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_index | 0 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy |
| wsrep_provider_version | 2.4(rXXXX) |
| wsrep_ready | ON |
+----------------------------+----------------------------------------------------------+
40 rows in set (0.00 sec)
监控状态说明
wsrep_last_committed:最后提交的事务数目
wsrep_local_cert_failures和wsrep_local_bf_aborts:回滚,检测到的冲突数目（www.51itstudy.com）
wsrep_local_send_queue_avg:网络瓶颈的预兆.如果这个值比较高的话,可能存在网络瓶
wsrep_flow_control_paused:表示复制停止了多长时间.即表明集群因为Slave延迟而慢的程度.值为0~1,越靠近0越好,值为1表示复制完全停止.可优化wsrep_slave_threads的值来改善.
wsrep_cert_deps_distance:有多少事务可以并行应用处理.wsrep_slave_threads设置的值不应该高出该值太多.
wsrep_flow_control_sent:表示该节点已经停止复制了多少次.
wsrep_local_recv_queue_avg:表示slave事务队列的平均长度.slave瓶颈的预兆.
wsrep_ready: 该值为ON,则说明可以接受SQL负载.如果为Off,则需要检查wsrep_connected.
wsrep_connected: 如果该值为Off,且wsrep_ready的值也为Off,则说明该节点没有连接到集群.(可能是wsrep_cluster_address或wsrep_cluster_name等配置错造成的.具体错误需要查看错误日志)
wsrep_local_state_comment:如果wsrep_connected为On,但wsrep_ready为OFF,则可以从该项查看原因.
wsrep_cluster_state_uuid:在集群所有节点的值应该是相同的,有不同值的节点,说明其没有连接入集群.
wsrep_cluster_conf_id:正常情况下所有节点上该值是一样的.如果值不同,说明该节点被临时”分区”了.当节点之间网络连接恢复的时候应该会恢复一样的值.
wsrep_cluster_size:如果这个值跟预期的节点数一致,则所有的集群节点已经连接.
wsrep_cluster_status:集群组成的状态.如果不为”Primary”,说明出现”分区”或是”split-brain”状况.
集群完整性检查:
节点状态检查:
复制健康检查:
最慢的节点的wsrep_flow_control_sent和wsrep_local_recv_queue_avg这两个值最高.这两个值较低的话,相对更好.
检测慢网络问题:
冲突或死锁的数目:
MySQL Galera其它特性
Galera arbitrator
garbd可以做为一个无数据的Galera节点运行,该节点可以用一种优化的方式帮助检测和处理网络分裂(network splits).
一个好的garbd节点可以防止”split-brain”状况发生.
SSL支持
Galera支持SSL通讯,这对增加数据安全性很重要(特别是云部署).可以通过参数socket.ssl_cert和socket.ssl_key来定义.
SST方式选择
SST允许新接入的节点使用定制的方法来获取最初的数据.SST方式有mysqldump(默认,比较慢),rsync,和xtrabackup(很快).
可通过wsrep_sst_method来定义.Production环境中建议使用rsync或是xtrabackup方式.
到此，相信大家对“MySQL多主复制和MySQL Galera的安装部署方法”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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