上传文件到opt目录下

Galera能够实现MySQL/MariaDB数据库的主主复制和多主复制等模式，这些复制模式都是同步进行的，同步时间非常短。

每一个节点都可以同时写入和读取，当某一节点发生故障时，可自动从集群中自动剔除。

HAProxy能提供负载均衡和故障判断等功能解决服务器系统存在的单点故障。

Keepalived能提供客户端连接数据库时使用的虚拟IP地址（VIP）。

（1）主节点

IP地址：node-1 192.168.1.74

（2）备份节点

IP地址：node-2 192.168.1.75

编辑每个节点/etc/hosts文件，添加所有节点IP地址和主机名

vi /etc/hosts

192.168.1.74 node-1

192.168.1.75 node-2

 关闭selinux

# vi /etc/selinux/config 

SELINUX=permissive

关闭防火墙并设置开机不自启

# systemctl stop firewalld

配置yum源文件

# vi /etc/yum.repos.d/mariadb.repo

 

#yum clean all

#yum list

安装服务（node-1节点和node-2节点）

#yum install MariaDB-server galera

修改配置文件

（1）修改/etc/my.cnf,添加以下内容（node-1节点和node-2节点）

#vi /etc/my.cnf

[mysqld]max_connect_errors=1000

（2）配置主节点node-1

#vi /etc/my.cnf.d/server.cnf

[galera]wsrep_on=ONwsrep_provider=/usr/lib64/galera/libgalera_smm.so wsrep_cluster_address=gcomm:// binlog_format=rowdefault_storage_engine=InnoDBinnodb_autoinc_lock_mode=2bind-address=0.0.0.0wsrep_cluster_name="MariaDB_Cluster"wsrep_node_address="192.168.1.74"wsrep_sst_method=rsyn

 

（3）配置备份节点node-2

#vi /etc/my.cnf.d/server.cnf

[galera]wsrep_on=ONwsrep_provider=/usr/lib64/galera/libgalera_smm.so wsrep_cluster_address="gcomm://192.168.1.74,192.168.1.75" binlog_format=rowdefault_storage_engine=InnoDBinnodb_autoinc_lock_mode=2bind-address=0.0.0.0wsrep_cluster_name="MariaDB_Cluster"wsrep_node_address="192.168.1.75"wsrep_sst_method=rsync

　启动服务

node-1节点：

#/bin/galera_new_cluster

node-2节点：

#systemctl start mariadb

测试集群状态

（1）查询集群状态

#mysql -u root -p

MariaDB [(none)]> show status like 'wsrep_%';

+------------------------------+---------------------------------------+| Variable_name                | Value                                 |+------------------------------+---------------------------------------+| wsrep_apply_oooe             | 0.000000                              || wsrep_apply_oool             | 0.000000                              || wsrep_apply_window           | 0.000000                              || wsrep_causal_reads           | 0                                     || wsrep_cert_deps_distance     | 0.000000                              || wsrep_cert_index_size        | 0                                     || wsrep_cert_interval          | 0.000000                              || wsrep_cluster_conf_id        | 2                                     || wsrep_cluster_size           | 2                                     || wsrep_cluster_state_uuid     | 841486a3-b56a-11e8-a451-d7d8f2309253  || wsrep_cluster_status         | Primary                               || wsrep_commit_oooe            | 0.000000                              || wsrep_commit_oool            | 0.000000                              || wsrep_commit_window          | 0.000000                              || wsrep_connected              | ON                                    || wsrep_desync_count           | 0                                     || wsrep_evs_delayed            |                                       || wsrep_evs_evict_list         |                                       || wsrep_evs_repl_latency       | 0/0/0/0/0                             || wsrep_evs_state              | OPERATIONAL                           || wsrep_flow_control_paused    | 0.000000                              || wsrep_flow_control_paused_ns | 0                                     || wsrep_flow_control_recv      | 0                                     || wsrep_flow_control_sent      | 0                                     || wsrep_gcomm_uuid             | 8412f980-b56a-11e8-bb08-4fd6339a7674  || wsrep_incoming_addresses     | 192.168.100.11:3306,192.168.1.74:3306 || wsrep_last_committed         | 0                                     || wsrep_local_bf_aborts        | 0                                     || wsrep_local_cached_downto    | 18446744073709551615                  || wsrep_local_cert_failures    | 0                                     || wsrep_local_commits          | 0                                     || wsrep_local_index            | 1                                     || wsrep_local_recv_queue       | 0                                     || wsrep_local_recv_queue_avg   | 0.166667                              || wsrep_local_recv_queue_max   | 2                                     || wsrep_local_recv_queue_min   | 0                                     || wsrep_local_replays          | 0                                     || wsrep_local_send_queue       | 0                                     || wsrep_local_send_queue_avg   | 0.000000                              || wsrep_local_send_queue_max   | 1                                     || wsrep_local_send_queue_min   | 0                                     || wsrep_local_state            | 4                                     || wsrep_local_state_comment    | Synced                                || wsrep_local_state_uuid       | 841486a3-b56a-11e8-a451-d7d8f2309253  || wsrep_protocol_version       | 7                                     || wsrep_provider_name          | Galera                                || wsrep_provider_vendor        | Codership Oy 
     
           || wsrep_provider_version       | 25.3.22(r3764)                        || wsrep_ready                  | ON                                    || wsrep_received               | 6                                     || wsrep_received_bytes         | 414                                   || wsrep_repl_data_bytes        | 0                                     || wsrep_repl_keys              | 0                                     || wsrep_repl_keys_bytes        | 0                                     || wsrep_repl_other_bytes       | 0                                     || wsrep_replicated             | 0                                     || wsrep_replicated_bytes       | 0                                     || wsrep_thread_count           | 2                                     |+------------------------------+---------------------------------------+58 rows in set (0.00 sec)
     

 

如果 "wsrep_local_state_comment" is "Synced" 则表明集群创建成功

（3）数据同步

在node-1上新建数据库galera_test

MariaDB [(none)]> create database galera_test;

MariaDB [(none)]> show databases;

在node-2上查询

MariaDB [(none)]> show databases;