Mariadb配置Galera集群
一、增加MariaDB源
cd /etc/yum.repos.d
vi MariaDB.repo
# MariaDB 10.1 CentOS repository list - created 2017-04-20 03:29 UTC
# http://downloads.mariadb.org/mariadb/repositories/
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.1/centos6-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
如果官方源比較慢，可以使用國內阿裏雲的源：
[mariadb]
name = MariaDB
baseurl=http://mirrors.aliyun.com/mariadb/mariadb-10.2.6/yum/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
二、安裝
yum install MariaDB-server MariaDB-client
安裝完成後啟動mysql服務（雖然改名叫mariadb，但服務名還是叫mysql）
service mysql start
三、配置
運行mysql_secure_installation設置數據庫root用戶密碼等。
設置完密碼後，使用root用戶登錄mariadb，設置root用戶權限：
mysql –uroot –p
GRANT ALL ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘Enjoylink$2017‘ with grant option;
FLUSH PRIVILEGES;
quit
如果安裝完成後，遇到無法登錄mysql：
[root@iZwz9d4e4x8w76gubkpk7gZ ~]# mysql_secure_installation
Enter current password for root (enter for none):
ERROR 1045 (28000): Access denied for user ‘root‘@‘localhost‘ (using password: YES)
此時，先關閉mysql服務
service mysql stop
編輯server.cnf文件
vi /etc/my.cnf.d/server.cnf
在[mysqld]中加上
[mysqld]
skip-grant-tables
忽略掉登錄權限，然後無密碼登錄mysql，並修改root賬戶密碼：
update user set password=PASSWORD("123456") where user=‘root‘;
修改成功後退出，把skip-grant-tables去掉，重啟mysql服務即可。
四、設置iptables，開放3306端口讓數據庫可以遠程訪問
vi /etc/sysconfig/iptables
增加：-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
保存，並重啟iptables服務
service iptables restart
五、配置數據庫集群（Galera Cluster）
三個節點都需要做以下工作：
創建同步用戶：
CREATE USER ‘syncUser‘@‘%‘ IDENTIFIED BY ‘sync$2017‘;
授權：
GRANT ALL ON *.* TO ‘syncUser‘@‘%‘ IDENTIFIED BY ‘sync$2017‘ with grant option;
配置HOSTS：
在三臺服務器中添加hosts設置，
vi /etc/hosts
10.243.3.27 dbnode1
10.243.3.17 dbnode2
10.34.2.200 dbnode3
停止所有節點上的mysql服務
service mysql stop
六、配置Mariadb服務
在所有節點服務器中都添加集群配置：
vi /etc/my.cnf.d/server.cnf
[galera]
wsrep_on=ON
wsrep_provider=/usr/lib64/galera/libgalera_smm.so
wsrep_cluster_address="gcomm://dbnode1,dbnode2,dbnode3"
binlog_format=row
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
七、停止SELinux安全限制
在所有節點上停止SELinux服務：
暫時停止：setenforce 0
永久停止：vi /etc/selinux/config
將SELINUX的值改一下：SELINUX=disabled
八、開放iptables防火墻端口
vi /etc/sysconfig/iptables
添加以下幾個端口：
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 4567 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 4444 -j ACCEPT
九、啟動集群主節點
It may not be safe to bootstrap the cluster from this node. It was not the last one to leave the cluster and may not contain all the updates. To force cluster bootstrap with this node, edit the grastate.dat file manually and set safe_to_bootstrap to 1 .
如果在所有集群節點都死光的情況下，兩次啟動集群時，應該在最後一臺死的節點上啟動。
service mysql start --wsrep_new_cluster
- or
service mysql bootstrap
十、啟動其它節點
service mysql start
十一、 查看集群狀態
在主節點上登錄Mariadb後，可以查看集群狀態：
MariaDB [(none)]> show status like ‘wsrep_%‘;
+------------------------------+----------------------------------------------------+
| Variable_name | Value |
+------------------------------+----------------------------------------------------+
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 1.000000 |
| wsrep_causal_reads | 0 |
| wsrep_cert_deps_distance | 4.133333 |
| wsrep_cert_index_size | 8 |
| wsrep_cert_interval | 0.000000 |
| wsrep_cluster_conf_id | 9 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | 0bdf4eb0-50e1-11e7-a4f3-9bce02f737ae |
| wsrep_cluster_status | Primary |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 1.000000 |
| wsrep_connected | ON |
| wsrep_desync_count | 0 |
| wsrep_evs_delayed | |
| wsrep_evs_evict_list | |
| wsrep_evs_repl_latency | 0.00394587/0.00611148/0.00826421/0.00192492/4 |
| 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 | 0b6d316f-50e3-11e7-addf-a66dba4d326d |
| wsrep_incoming_addresses | 10.34.2.200:3306,10.243.3.27:3306,10.243.3.17:3306 |
| wsrep_last_committed | 15 |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_cached_downto | 1 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_commits | 15 |
| wsrep_local_index | 0 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_avg | 0.000000 |
| wsrep_local_recv_queue_max | 1 |
| 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 | 0bdf4eb0-50e1-11e7-a4f3-9bce02f737ae |
| wsrep_protocol_version | 7 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy <[email protected]> |
| wsrep_provider_version | 25.3.20(r3703) |
| wsrep_ready | ON |
| wsrep_received | 22 |
| wsrep_received_bytes | 2308 |
| wsrep_repl_data_bytes | 8491 |
| wsrep_repl_keys | 51 |
| wsrep_repl_keys_bytes | 753 |
| wsrep_repl_other_bytes | 0 |
| wsrep_replicated | 15 |
| wsrep_replicated_bytes | 10204 |
| wsrep_thread_count | 2 |
+------------------------------+----------------------------------------------------+
58 rows in set (0.00 sec)
Mariadb配置Galera集群