新节点在线加入PXC

环境

192.168.139.151 新增节点

192.168.139.148-150 集群节点

192.168.139.151 已经安装好PXC软件

计划：

选用192.168.139.150 节点先与192.168.139.151组成主从节点

再转成集群节点

构建主从环境

150 节点创建主从同步账号：

mysql>create user 'bak'@'192.168.139.%' identified by '123456';

mysql>grant replication slave on *.* to 'bak'@'192.168.139.%';

mysql>flush privileges;

150数据拷贝至151上

#mysqldump --single-transaction -uroot -p123456 -A --master-data=2 > all.sql

#scp all.sql root@192.168.139.151:/opt/

151上恢复数据

mysql>SET GLOBAL pxc_strict_mode=PERMISSIVE;

#mysql -u root -p123456 < all.sql

151配置主从同步

#####master_log 信息可在150 使用flsuh logs ; show master status查看

change master to master_host='192.168.139.150',master_user='bak',master_password='123456',master_log_file='pxc-bin.000001',master_log_pos=928;

151开启同步

start slave;

show slave statusG;

151配置集群

systemctl stop mysql

vim /etc/my.cnf ===>注意文件下面的include ，配置文件可能在指定路径中，my.cnf只是类似于软链

server-id=4 #与集群中其他的节点不一样

[mysqld]
# Path to Galera library
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so

# Cluster connection URL contains IPs of nodes
#If no IP is found, this implies that a new cluster needs to be created,
#in order to do that you need to bootstrap this node
wsrep_cluster_address=gcomm://192.168.139.148,192.168.139.149,192.168.139.150,192.168.139.151

# In order for Galera to work correctly binlog format should be ROW
binlog_format=ROW

# MyISAM storage engine has only experimental support
default_storage_engine=InnoDB

# Slave thread to use
wsrep_slave_threads= 8

wsrep_log_conflicts

# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera
innodb_autoinc_lock_mode=2

# Node IP address
wsrep_node_address=192.168.139.151
# Cluster name
wsrep_cluster_name=pxc-cluster

#If wsrep_node_name is not specified, then system hostname will be used
wsrep_node_name=pxc-cluster-node-4

#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER
pxc_strict_mode=ENFORCING

# SST method
wsrep_sst_method=xtrabackup-v2

#Authentication for SST method
srep_sst_auth="sstuser:passw0rd"

150检查PXC需要同步位置

mysqlbinlog -v -v mysql-bin.000001 | grep Xid ===》找到position 对应的，没有就在MySQL中的表随便插入什么东西，执行commit ,在查询

scp /var/lib/mysql/grastate.dat root@192.168.139.151:/var/lib/mysql/

151编辑文件

vim /var/lib/mysql/grastate.dat

seqno ===> 修改成Xid对应的值

chown mysql:mysql /var/lib/mysql/grastate.dat

systemctl start mysql

151查看测试结果：

mysql> show status like 'wsrep%';

可在其他节点插入数据，查看151节点的数据是否同步