名词介绍：
WS：write set写数据集
IST: Incremental State Transfer增量同步
SST：State Snapshot Transfer全量同步
1.准备环境
1.1 centos 7系统,三台主机
IP分别为：192.168.80.163；192.168.80.167；192.168.80.168
建议关闭iptables，4个端口3306,4444,4567,4568
pxc环境所涉及的端口：
#mysql实例端口：3306
1.2清空mysql数据库mariDB，及其他数据库
[root@localhost ~]# yum list|grep mari
[root@localhost ~]# yum remove“”
1.3关闭防火墙、selinux
[root@bogon ~]# systemctl stop firewalld
[root@bogon ~]# systemctl disable firewalld
[root@bogon ~]# systemctl status firewalld
[root@linux01 ~]#vi /etc/selinux/config
#This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
2.下载安装
2.1下载yum源安装包，Yum安装
[root@localhost /]# yum install percona-release-0.1-6.noarch\ .rpm -y
[root@localhost /]# yum install Percona-XtraDB-Cluster-57
[root@localhost /]# yum install -y git scons gcc gcc-c++ openssl check cmake bison \
boost-devel asio-devel libaio-devel ncurses-devel readline-devel pam-devel \
Socat
3.创建第一个节点
3.1主机192.168.80.163上编辑my.cnf文件
/etc下编辑my.cnf文件
内容：
[mysqld]
datadir = /mysqldb/db_pxc
pid_file= /mysqldb/db_pxc/mysql.pid
character-set-server=utf8
log-bin=/mysqldb/db_pxc/log_bin
server-id = 9816000
innodb_buffer_pool_size = 300M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_data_home_dir = /mysqldb/db_pxc
innodb_file_per_table=1
skip-name-resolve
port = 3306
socket = /mysqldb/db_pxc/mysql.sock
user=mysql
log_error=/mysqldb/db_pxc/mysql_error.log
#pxc
user=mysql
binlog_format=ROW
log-slave-updates
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so
wsrep_cluster_name=pxc
wsrep_cluster_address='gcomm://192.168.80.163,192.168.80.167,192.168.80.168'##加入三台主机地址##
wsrep_node_name=pxc3
wsrep_node_address=192.168.80.166##当前主机地址##
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=sstuser:passw0rd##数据库所用用户及密码##
pxc_strict_mode=ENFORCING
binlog_format=ROW
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
4.创建文件目录
[root@localhost ~]# mkdir -p /mysqldb/db_pxc
5.实例1启动
5.1启动、关闭第一个实例需要加“@bootstrap.service”
[root@localhost ~]# systemctl startmysql@bootstrap.service
@bootstrap.service中的参数
[root@localhost ~]# more /etc/sysconfig/mysql.bootstrap
# Arguments to pass to mysqld_safe in systemctl
# For Bootstrapping
# You can append any extra options in to the same variable.
EXTRA_ARGS=" --wsrep-new-cluster "
# Other environment variables if any
# ABC=123 for example
查看日志[root@localhost ~]# tail -f /mysqldb/db_pxc/mysql_error.log
5.2日志中查看临时密码
[root@localhost ~]# vi /mysqldb/db_pxc/mysql_error.log
5.3进入数据库，创建用户、授权
[root@localhost ~]# mysql -uroot -p -S /mysqldb/db_pxc/mysql.sock
mysql> alter user root@'localhost' identified by 'oracle';
mysql> CREATE USER 'sstuser'@'localhost' IDENTIFIED BY 'passw0rd';
mysql> GRANT RELOAD, LOCK TABLES, PROCESS, REPLICATION CLIENT ON *.* TO 'sstuser'@'localhost';
所创建用户及密码需要与文件my.cnf中的配置相同
5.4查看集群状态
mysql> show status like 'wsrep%';
##{文件资料：#安装实例
/usr/local/pxc_56/scripts/mysql_install_db --defaults-file=/home/mysql/my6000.cnf --basedir=/usr/local/pxc_56
#启动第一个实例
/usr/local/pxc_56/bin/mysqld_safe --defaults-file=/home/mysql/my6000.cnf --ledir=/usr/local/pxc_56/bin/--wsrep-new-cluster&
#修改密码
/usr/local/pxc_56/bin/mysqladmin -u root -P6000 password '000000' -S /home/mysql/I6000/mysql.sock
#登陆并增加用户
/usr/local/pxc_56/bin/mysql -uroot -p -P6000 -S /home/mysql/I6000/mysql.sock
grant all on *.* to 'sstuser'@'localhost' identified by '123';
flush privielges;}##
6.创建第二个节点
6.1在主机192.168.80.167上编辑文件my.cnf
7.创建文件目录
[root@localhost ~]# mkdir -p /mysqldb/db_pxc
8.启动实例2，第二个节点不用加参数@bootstrap.service ##参数：--wsrep -new-cluster
[root@localhost ~]# systemctl start mysql
9.查看集群状态
mysql> show status like 'wsrep%';
10.创建第三个节点
10.1编辑主机IP192.168.80.168的my.cnf文件
11.创建文件目录
[root@localhost ~]# mkdir -p /mysqldb/db_pxc
12.启动实例节点3
[root@localhost ~]# systemctl start mysql
13.查看集群状态
mysql> show status like 'wsrep%';
14.关闭自动启动
[root@localhost ~]# systemctl list-unit-files|grep mysql
mysql.service enabled
mysql@.service disabled
mysqld.service enabled
[root@localhost ~]#systemctl disable mysql.service
Removed symlink /etc/systemd/system/multi-user.target.wants/mysql.service.
Removed symlink /etc/systemd/system/mysqld.service.
15.安装所遇问题解决
15.1关闭后再启动第一个节点失败时，按照日志提醒设置以下参数safe_to_bootstrap: 0
改为：1可以启动：
[root@localhost db_pxc]# pwd
/mysqldb/db_pxc
[root@localhost db_pxc]#vi grastate.dat
# GALERA saved state
version: 2.1
uuid: 26b3d51f-a867-11e8-8b78-e7ac0d1df513
seqno: -1
safe_to_bootstrap: 0
15.2启动第一个节点时需用命令systemctl startmysql@bootstrap.service
其他两个节点用systemctl start mysql 不需要加参数。
