1 服务器

mysql00 192.168.20.104

mysql01 192.168.20.102

mysql02 192.168.20.103

haproxy 192.168.20.105

haproxy1 192.168.20.106

2 yum源

vi /etc/yum.repos.d/galera.repo

[galera]

name=Galera

baseurl=http://releases.galeracluster.com/centos/7/x86_64/

gpgkey=http://releases.galeracluster.com/GPG-KEY-galeracluster.com

gpgcheck=1

[mariadb]

name=MariaDB

baseurl=http://yum.mariadb.org/5.5/centos7-amd64/

enabled=1

gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB

gpgcheck=1

3 修改hosts hostname

vi /etc/hosts

mysql00 192.168.20.104

mysql01 192.168.20.102

mysql02 192.168.20.103

vi /etc/hostname

mysql00(01,02)

4yuminstallMariaDB-clientMariaDB-Galera-servergalera-y

5 修改数据库配置文件

vi /etc/my.cnf

[mysqld]

datadir=/home/mysql#修改mysql数据目录

socket=/var/lib/mysql/mysql.sock

user=mysql

binlog_format=ROW

bind-address=0.0.0.0

default_storage_engine=InnoDB

innodb_autoinc_lock_mode=2

innodb_flush_log_at_trx_commit=0

innodb_buffer_pool_size=122M

innodb_log_file_size=48M

wsrep_provider=/usr/lib64/galera/libgalera_smm.so

#wsrep_provider_options="gcache.size=300M;gcache.page_size=300M"

wsrep_cluster_name="cluster"

wsrep_cluster_address="gcomm://192.168.20.104,192.168.20.102,192.168.20.103" #配置集群中所有节点IP

wsrep_node_name=mysql00 #本节点NAME

wsrep_node_address="192.168.20.104" #本节点IP地址

wsrep_sst_method=rsync#全量同步方式

[mysql_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

6 启动第一个节点mysql00

必须按顺序启动，先启动第一个节点（/etc/init.d/mysqlstart--wsrep-new-cluster），然后启动其他节点（/etc/init.d/mysqlstart）

/etc/init.d/mysqlstart--wsrep-new-cluster

成功显示success

在数据库中查看：

MariaDB[(none)]>showglobalstatuslike'wsrep_cluster%';

+--------------------------+--------------------------------------+

|Variable_name|Value|

+--------------------------+--------------------------------------+

|wsrep_cluster_conf_id|20|

|wsrep_cluster_size| 1|

|wsrep_cluster_state_uuid|f5845fb3-abd6-11e6-82e5-627a888c772f|

|wsrep_cluster_status|Primary|

+--------------------------+--------------------------------------+

wsrep_cluster_size 1 表示已有一个节点

7 设置数据库root密码

/usr/bin/mysql_secure_installation

8 配置cluster_check

cd /tmp
wgethttps://raw.githubusercontent.com/olafz/percona-clustercheck/master/clustercheck

chmod +x clustercheck
mv clustercheck /usr/bin/

vi /etc/xinetd.d/mysqlchk

# default: on
# description: mysqlchk
service mysqlchk
{
 disable = no
 flags = REUSE
 socket_type = stream
 port = 9200 # This port used by xinetd for clustercheck
 wait = no
 user = nobody
 server = /usr/bin/clustercheck
 log_on_failure += USERID
 only_from = 0.0.0.0/0
 per_source = UNLIMITED
}

systemctl start xinetd

安装HAproxy

登录192.168.20.105 192.168.20.106

vi /etc/hosts

mysql00 192.168.20.104

mysql01 192.168.20.102

mysql02 192.168.20.103

haproxy 192.168.20.105

haproxy1 192.168.20.106

yum -y install haproxy

vi /etc/rsyslog.conf(为haproxy配置log)

#ProvidesUDPsyslogreception$ModLoadimudp$UDPServerRun51

vi /etc/rsyslog.d/haproxy.conf

local2.=info/var/log/haproxy-access.loglocal2.notice/var/log/haproxy-info.log

systemctl restart rsyslog

Create a new HAProxy configuration file

cd /etc/haproxy/
mv haproxy.cfg haproxy.cfg.orig （将之前的配置文件备份）

vi /etc/haproxy/haproxy.cfg （创建新的配置文件）

global

log127.0.0.1local2

maxconn1024

userhaproxy

grouphaproxy

daemon

statssocket/var/run/haproxy.sockmode600leveladmin#Makesockfileforhaproxy

defaults

logglobal

modehttp

optiontcplog

optiondontlognull

retries3

optionredispatch

maxconn1024

timeoutconnect5000ms

timeoutclient50000ms

timeoutserver50000ms

listenmariadb_cluster0.0.0.0:3030

##MariaDBbalanceleastconn-theclusterlisteningonport3030.

modetcp

#balanceleastconn

balanceroundrobin #轮询

optiontcpka

optionmysql-checkuserhaproxy#健康检查

servermysql00192.168.20.104:3306checkweight1 #主用

servermysql01192.168.20.102:3306checkweight1 #主用

servermysql02192.168.20.103:3306checkweight1backup#备用

listenstats0.0.0.0:9000

##HAProxystatswebguirunningonport9000-usernameandpassword:howtoforge.WEB界面管理

modehttp

statsenable

statsuri/stats

statsrealmHAProxy\Statistics

statsauthhowtoforge:howtoforge

statsadminifTRUE

KEEPALIVED 配置（虚拟地址为192.168.20.107）

HAproxy

yum install -y keepalived

global_defs{

notification_email{

#cloud_data@163.com#e-mail地址

}

#notification_email_fromcloud_data@163.com

#smtp_serversmtp.163.com#邮件服务器地址

#smtp_connect_timeout30#连接超时时间

router_idLVS_Master

}

vrrp_scriptchk_http_port{

script"/etc/keepalived/check_haproxy.sh"#haproxy运行检测脚本[haproxy宕掉重启haproxy服务]

interval5#脚本执行间隔

weight-5#执行脚本后优先级变更：5表示优先级+5;-5则表示优先级-5

}

vrrp_instanceVI_A{

stateMASTER#主上此值为MASTER,从上为BACKUP

interfaceeth0

virtual_router_id50#此值主从必须一致

priority100

advert_int1

authentication{#authentication两个参数值,主从也必须一致

auth_typePASS

auth_passkongzhong

}

track_script{

chk_http_port

}

virtual_ipaddress{

192.168.20.107#haproxy提供的虚拟IP地址

}

}

HAproxy1

global_defs{

notification_email{

#cloud_data@163.com

}

#notification_email_fromcloud_data@163.com

#smtp_serversmtp.163.com

#smtp_connect_timeout30

router_idLVS_Master

}

vrrp_scriptchk_http_port{

script"/etc/keepalived/check_haproxy.sh"

interval5

weight-5

}

vrrp_instanceVI_A{

stateBACKUP

interfaceeth0

virtual_router_id50

priority80

advert_int1

authentication{

auth_typePASS

auth_passkongzhong

}

track_script{

chk_http_port

}

virtual_ipaddress{

192.168.20.107

}

}

验证：

在浏览器输入http://192.168.20.107:9000/stats

用户名/密码：howtoforge/howtoforge

状态显示正常

断开192.168.20.104 192.168.20.102其中一台 ，登录数据库虚拟地址 mysql -uroot -p -P 3030 -h 192.168.20.107 ，是否可以正常登录