PXC三节点安装：
node1：10.157.26.132
node2：10.157.26.133
node3：10.157.26.134
配置服务器ssh登录无密码验证
ssh-keygen实现三台主机之间相互免密钥登录，保证三台主机之间能ping通
1)在所有的主机上执行：
# ssh-keygen -t rsa
2)将所有机子上公钥（id_rsa.pub）导到一个主机的/root/.ssh/authorized_keys文件中,然后将authorized_keys分别拷贝到所有主机上
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
ssh 10.157.26.133 cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
ssh 10.157.26.134 cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
scp /root/.ssh/authorized_keys 10.157.26.133:/root/.ssh/authorized_keys
scp /root/.ssh/authorized_keys 10.157.26.134:/root/.ssh/authorized_keys
测试：ssh 10.157.26.133/10.157.26.134
安装依赖包：
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
若socat无法用yum安装，可下载源码包安装
wget
tar zxvf socat-1.7.3.2.tar.gz
cd socat-1.7.3.2
./configure
make && make install
1、将二进制包解压，添加mysql账号，做软连接【三个节点都要操作】：
wget https://www.percona.com/downloads/Percona-XtraDB-Cluster-LATEST/Percona-XtraDB-Cluster-5.7.17-29.20/binary/tarball/Percona-XtraDB-Cluster-5.7.17-rel13-29.20.3.Linux.x86_64.ssl101.tar.gz
mkdir /opt/mysql
cd /opt/mysql
tar zxvf /data/src/Percona-XtraDB-Cluster-5.7.17-rel13-29.20.3.Linux.x86_64.ssl101.tar.gz
cd /usr/local
ln -s /opt/mysql/Percona-XtraDB-Cluster-5.7.17-rel13-29.20.3.Linux.x86_64.ssl101/ mysql
groupadd mysql
useradd -M -g mysql -s /sbin/nologin/ -d /usr/local/mysql mysql
2、新建文件夹请授权【三个节点都要操作】 ：
mkdir -p /data/mysql/mysql_3306/{data,logs,tmp}
mkdir -p /data/mysql/mysql_3306/logs/binlog
chown -R mysql:mysql /data/mysql/
chown -R mysql:mysql /usr/local/mysql
3、配置文件my.cnf
132的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so #库文件位置
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134 #集群中所有节点的ip
wsrep_node_name = node132 #本节点的名字
wsrep_node_address = 10.157.26.132 #本节点的ip
wsrep_cluster_name = pxc_sampson #集群名字
wsrep_sst_auth = sst:sampson #sst模式需要的用户名和密码
wsrep_sst_method = xtrabackup-v2 #采用什么方式复制数据。还支持mysqldump，rsync
wsrep_slave_threads = 2 # 开启的复制线程数，建议cpu核数*2 ，解决apply_cb跟不上问题
pxc_strict_mode = ENFORCING #pxc严厉模式，还有DISABLED、PERMISSIVE、MASTER可选
innodb_autoinc_lock_mode = 2 #自增锁的优化
wsrep_provider_options = "debug=1;gcache.size=1G" #打开调试模式
133的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134
wsrep_node_name = node133
wsrep_node_address = 10.157.26.133
wsrep_cluster_name = pxc_sampson
wsrep_sst_auth = sst:sampson
wsrep_sst_method = rsync
wsrep_slave_threads = 2
pxc_strict_mode = ENFORCING
innodb_autoinc_lock_mode = 2
wsrep_provider_options = "debug=1;gcache.size=1G"
134的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134
wsrep_node_name = node134
wsrep_node_address = 10.157.26.134
wsrep_cluster_name = pxc_sampson
wsrep_sst_auth = sst:sampson
wsrep_sst_method = rsync
wsrep_slave_threads = 2
pxc_strict_mode = ENFORCING
innodb_autoinc_lock_mode = 2
wsrep_provider_options = "debug=1;gcache.size=1G"