1.准备阶段
1.1 在三个节点上分别创建：用户组 用户组 目录--用户组 用户组#/usr/sbin/groupadd mysql#/usr/sbin/useradd -g mysql mysql--目录#mkdir –p  /usr/local/mysql#chown -R mysql:mysql /usr/local/mysql#chmod -R  755 /usr/local/mysql#mkdir -p  /mysql/3306/{data,redo,binlog,tmp,logs}#chown -R  mysql:mysql /mysql#chmod -R  755 /mysql1.2 修改内核参数切换到root用户[root@DBMysql2 ~]# vi  /etc/security/limits.conf mysql   soft    nproc   65535mysql   hard    nproc   65535mysql   soft    nofile  65535mysql   hard    nofile  65535[root@node1 ~]#2.开始部署
2.1 三个节点分别安装依赖包:yum -y install percona-xtrabackup-24-2.4.12-1.el7.x86_64.rpmyum -y install 2.2 解压Percona-XtraDB-Cluster在mysql用户下，将压缩包（Percona-XtraDB-Cluster-5.7.23-rel23-31.31.2.Linux.x86_64.ssl101.tar）解压到 /usr/local/mysql下[mysql@node1 mysql]$ pwd/usr/local/mysql[mysql@node1 mysql]$ ls -l总用量 88drwxrwxr-x.  2 mysql mysql  4096 12月 19 14:28 bin-rw-rw-r--.  1 mysql mysql 17987 12月 19 14:31 COPYING-rw-rw-r--.  1 mysql mysql  1703 12月 19 14:31 COPYING-jemalloc-rw-rw-r--.  1 mysql mysql 17987 12月 19 14:31 COPYING-testdrwxrwxr-x.  2 mysql mysql    55 12月 19 14:28 docsdrwxrwxr-x.  3 mysql mysql  4096 12月 19 14:28 includedrwxrwxr-x.  4 mysql mysql   228 12月 19 14:28 libdrwxrwxr-x.  4 mysql mysql    30 12月 19 14:28 mandrwxrwxr-x. 10 mysql mysql  4096 12月 19 14:31 mysql-testdrwxrwxr-x.  5 mysql mysql    50 12月 19 14:31 percona-xtradb-cluster-tests-rw-rw-r--.  1 mysql mysql  2478 12月 19 14:31 README.MySQL-rw-rw-r--.  1 mysql mysql   444 12月 19 14:31 README-test-rw-rw-r--.  1 mysql mysql 19626 12月 19 14:31 README-wsrepdrwxrwxr-x. 28 mysql mysql  4096 12月 19 14:31 sharedrwxrwxr-x.  2 mysql mysql   110 12月 19 14:31 support-filesdrwxrwxr-x.  2 mysql mysql    22 12月 19 14:31 xinetd.d[mysql@node1 mysql]$    2.3 创建my.cnf配置文件(只截取pxc部分)#pxcserver_id  = 1wsrep_provider=/usr/local/mysql/lib/libgalera_smm.so  wsrep_cluster_name=pxc-mysqlwsrep_cluster_address=gcomm://192.168.2.55,192.168.2.56,192.168.2.57wsrep_node_name=node1wsrep_node_address=192.168.2.55wsrep_sst_method=xtrabackup-v2 wsrep_sst_auth=pxc:123456pxc_strict_mode=ENFORCING binlog_format=ROW default_storage_engine=InnoDBinnodb_autoinc_lock_mode=2注意：其他两个个节点，只需要修改：server-id=1             --id不能一样wsrep_node_name=node1   --改成自己节点的主机名wsrep_node_address=192.168.2.55  --改成自己节点的主机IP2.4 各个节点分别初始化数据库:./mysqld --defaults-file=/mysql/3306/my.cnf --initialize./mysqld --defaults-file=/mysql/3306/my.cnf --initialize./mysqld --defaults-file=/mysql/3306/my.cnf --initialize2.5 启动节点node1./mysqld_safe --defaults-file=/mysql/3306/my.cnf --wsrep-new-cluster  &2.6 在node1节点修改密码，创建复制用户--修改密码(root@localhost:mysql.sock) [(none)]>set password='123456';Query OK, 0 rows affected (0.32 sec)      ---创建一个SST用户(root@localhost:mysql.sock) [(none)]>GRANT RELOAD, LOCK TABLES, PROCESS, REPLICATION CLIENT ON *.* TO 'pxc'@'%' IDENTIFIED BY '123456';    ---创建一个SST用户    2.7 启动节点node2、node3    ./mysqld_safe --defaults-file=/mysql/3306/my.cnf  --user=mysql &./mysqld_safe --defaults-file=/mysql/3306/my.cnf  --user=mysql &3、验证集群--节点node1(root@localhost:mysql.sock) [(none)]>show status like 'wsrep_cluster_%';+--------------------------+--------------------------------------+| Variable_name            | Value                                |+--------------------------+--------------------------------------+| wsrep_cluster_weight     | 3                                    || wsrep_cluster_conf_id    | 3                                    | --表示3个节点| wsrep_cluster_size       | 3                                    || wsrep_cluster_state_uuid | 1814041e-0365-11e9-9a41-53781b688bfb || wsrep_cluster_status     | Primary                              |+--------------------------+--------------------------------------+5 rows in set (0.00 sec)(root@localhost:mysql.sock) [(none)]>--任意一个节点执行创建数据库操作，看其他节点是否同步PXC-01：(root@localhost:mysql.sock) [(none)]>> create database pxc01;          #注意查看其他节点是否同步PXC-02：(root@localhost:mysql.sock) [(none)]>> create database pxc02;         #注意查看其他节点是否同步PXC-03：(root@localhost:mysql.sock) [(none)]>> create database pxc03;          #注意查看其他节点是否同步停止数据库:--最后停主节点./mysqladmin --defaults-file=/mysql/3306/my.cnf -uroot -p123456 -hlocalhost shutdown    4.部署期间遇到的问题：--关闭防火墙：systemctl stop firewalld2018-12-19T08:44:46.598184Z 0 [Warning] WSREP: last inactive check more than PT1.5S (3*evs.inactive_check_period) ago (PT3.5271S), skipping check2018-12-19T08:45:16.264325Z 0 [Note] WSREP: Current view of cluster as seen by this nodeview ((empty))2018-12-19T08:45:16.266833Z 0 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view (pc.wait_prim_timeout): 110 (Connection timed out)at gcomm/src/pc.cpp:connect():1592018-12-19T08:45:16.267665Z 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():209: Failed to open backend connection: -110 (Connection timed out)2018-12-19T08:45:16.272534Z 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1514: Failed to open channel 'pxc-mysql' at 'gcomm://192.168.2.55,192.168.2.56,192.168.2.57': -110 (Connection timed out)2018-12-19T08:45:16.272618Z 0 [ERROR] WSREP: gcs connect failed: Connection timed out2018-12-19T08:45:16.272647Z 0 [ERROR] WSREP: Provider/Node (gcomm://192.168.2.55,192.168.2.56,192.168.2.57) failed to establish connection with cluster (reason: 7)2018-12-19T08:45:16.272676Z 0 [ERROR] Aborting2018-12-19T08:45:16.272695Z 0 [Note] Giving 0 client threads a chance to die gracefully2018-12-19T08:45:16.272723Z 0 [Note] WSREP: Waiting for active wsrep applier to exit2018-12-19T08:45:16.272741Z 0 [Note] WSREP: Service disconnected.2018-12-19T08:45:16.272756Z 0 [Note] WSREP: Waiting to close threads......2018-12-19T08:45:21.274280Z 0 [Note] WSREP: Some threads may fail to exit.2018-12-19T08:45:21.275314Z 0 [Note] Binlog end2018-12-19T08:45:21.277021Z 0 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete--安装 percona-xtrabackup-24-2.4.12-1.el7.x86_64.rpm2018-12-20T05:53:59.541638Z 0 [Note] WSREP: Initiating SST/IST transfer on JOINER side (wsrep_sst_xtrabackup-v2 --role 'joiner' --address '192.168.2.56' --datadir '/mysql/3306/data/' --defaults-file '/mysql/3306/my.cnf' --defaults-group-suffix '' --parent '14448' --mysqld-version '5.7.23-23-31.31'   '' )which: no xtrabackup in (/usr/sbin:/sbin:/usr/local/mysql/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/mysql/.local/bin:/home/mysql/bin)2018-12-20T05:53:59.695991Z WSREP_SST: [ERROR] ******************* FATAL ERROR ********************** 2018-12-20T05:53:59.700710Z WSREP_SST: [ERROR] xtrabackup not in path: /usr/sbin:/sbin:/usr/local/mysql/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/mysql/.local/bin:/home/mysql/bin2018-12-20T05:53:59.705288Z WSREP_SST: [ERROR] ****************************************************** 2018-12-20T05:53:59.708133Z 0 [ERROR] WSREP: Failed to read 'ready <addr>' from: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '192.168.2.56' --datadir '/mysql/3306/data/' --defaults-file '/mysql/3306/my.cnf' --defaults-group-suffix '' --parent '14448' --mysqld-version '5.7.23-23-31.31'   '' Read: '(null)'2018-12-20T05:53:59.708181Z 0 [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '192.168.2.56' --datadir '/mysql/3306/data/' --defaults-file '/mysql/3306/my.cnf' --defaults-group-suffix '' --parent '14448' --mysqld-version '5.7.23-23-31.31'   '' : 2 (No such file or directory)2018-12-20T05:53:59.708302Z 2 [ERROR] WSREP: Failed to prepare for 'xtrabackup-v2' SST. Unrecoverable.2018-12-20T05:53:59.708333Z 2 [ERROR] Aborting---主节点忘记安装：percona-xtrabackup-24-2.4.12-1.el7.x86_64.rpm2018-12-20T07:27:52.624492Z 2 [Note] WSREP: Requesting state transfer: success, donor: 02018-12-20T07:27:52.624544Z 2 [Note] WSREP: GCache history reset: 00000000-0000-0000-0000-000000000000:0 -> 1814041e-0365-11e9-9a41-53781b688bfb:32018-12-20T07:27:52.769911Z 0 [Warning] WSREP: 0.0 (node1): State transfer to 1.0 (node2) failed: -2 (No such file or directory)2018-12-20T07:27:52.769950Z 0 [ERROR] WSREP: gcs/src/gcs_group.cpp:gcs_group_handle_join_msg():766: Will never receive state. Need to abort.2018-12-20T07:27:52.770158Z 0 [Note] WSREP: gcomm: terminating thread2018-12-20T07:27:52.770181Z 0 [Note] WSREP: gcomm: joining thread