Mycat中间件实现Percona Cluster集群读写分离

Mycat实现读写分离架构图：

Mycat主从自动切换架构图：

Mycat下载地址：http://dl.mycat.io/1.6.7.3/20190828135747/Mycat-server-1.6.7.3-release-20190828135747-linux.tar.gz
Percona-XtraDB-Cluster下载地址：https://www.percona.com/downloads/Percona-XtraDB-Cluster-57/LATEST/

Percona-XtraBackup下载地址：

https://www.percona.com/downloads/Percona-XtraBackup-2.4/LATEST/
yum仓库地址：https://www.percona.com/downloads/percona-release/redhat/
1.下载，安装Percona-XtraDB-Cluster（三台都需要装）

[root@k8s01 ~]# rpm -ivh https://www.percona.com/redir/downloads/percona-release/redhat/1.0-13/percona-release-1.0-13.noarch.rpm
[root@k8s01 ~]# yum repolist
[root@k8s01 ~]# rpm -ivh percona-xtrabackup-24-2.4.13-1.el7.x86_64.rpm
[root@k8s01 ~]# yum install Percona-XtraDB-Cluster-57 -y
2.修改配置，启动服务（k8s01节点）
[root@k8s01 ~]# vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf
log-bin=k8s01-bin

log-bin-index=k8s01-bin-index
[root@k8s01 ~]# vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf
[mysqld]
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so
wsrep_cluster_address=gcomm://192.168.54.129,192.168.54.130,192.168.54.128
binlog_format=ROW
default_storage_engine=InnoDB
wsrep_slave_threads= 8
wsrep_log_conflicts
innodb_autoinc_lock_mode=2
wsrep_node_address=192.168.54.128 –三个节点值不一样
wsrep_cluster_name=mycluster
wsrep_node_name=k8s01
pxc_strict_mode=ENFORCING
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=”sstuser:s3cretPass”
[root@k8s01 ~]# mysql_install_db –defaults-file=/etc/percona-xtradb-cluster.cnf –datadir=/var/lib/mysql –初使化数据
[root@k8s01 ~]# systemctl start
mysql@bootstrap.service –第一次启动，不需要同步数据

[root@k8s01 ~]# ps -ef | grep mysql

root 60672 54285 0 14:56 pts/1 00:00:00 tailf /var/log/mysqld.log

root 66031 1 0 15:03 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe –basedir=/usr –wsrep-new-cluster

mysql 66568 66031 6 15:03 ? 00:00:01 /usr/sbin/mysqld –basedir=/usr –datadir=/var/lib/mysql –plugin-dir=/usr/lib64/mysql/plugin –user=mysql –wsrep-provider=/usr/lib64/galera3/libgalera_smm.so –wsrep-new-cluster –log-error=

/var/log/mysqld.log –pid-file=/var/run/mysqld/mysqld.pid –socket=/var/lib/mysql/mysql.sock –wsrep_start_position=00000000-0000-0000-0000-000000000000:-1root 66763 33815 0 15:04 pts/0 00:00:00 grep –color=auto mysql

3.修改配置，启动服务（k8s02节点）
[root@k8s02 ~]# vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf
log-bin=k8s01-bin

log-bin-index=k8s01-bin-index
[root@k8s02 ~]# vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf
[mysqld]
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so
wsrep_cluster_address=gcomm://192.168.54.128,192.168.54.129,192.168.54.130
binlog_format=ROW
default_storage_engine=InnoDB
wsrep_slave_threads= 8
wsrep_log_conflicts
innodb_autoinc_lock_mode=2
wsrep_node_address=192.168开发云主机域名.54.129
wsrep_cluster_name=mycluster
wsrep_node_name=k8s02
pxc_strict_mode=ENFORCING
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=”sstuser:s3cretPass”
[root@k8s02 ~]# systemctl start mysql
4.修改配置，启动服务（k8s03节点）
[root@k8s03 ~]# vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf
log-bin=k8s01-bin

log-bin-index=k8s01-bin-index

[root@k8s03 ~]# vim /etc/percona-xtradb-cluster.conf.d/wsrep.cnf
[mysqld]
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so

default_storage_engine=InnoDB
wsrep_slave_threads= 8
wsrep_log_conflicts
innodb_autoinc_lock_mode=2
wsrep_node_address=192.168.54.130
wsrep_cluster_name=mycluster
wsrep_node_name=k8s03
pxc_strict_mode=ENFORCING
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=”sstuser:s3cretPass”
[root@k8s03 ~]# systemctl start mysql

5.测试Percona-XtraDB-Cluster集群数据同步
k8s01节点：
k8s02节点：

6.下载，安装Mycat中间件
[root@[root@k8s01 soft]# rpm -ivh jdk-8u221-linux-x64.rpm

warning: jdk-8u221-linux-x64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY

Preparing… ################################# [100%]

Updating / installing…

1:jdk1.8-2000:1.8.0_221-fcs ################################# [100%]

Unpacking JAR files…

tools.jar…

plugin.jar…

javaws.jar…

deploy.jar…

rt.jar…

jsse.jar…

charsets.jar…

localedata.jar…

[root@k8s01 soft]# tar xvf Mycat-server-1.6.7.3-release-20190828135747-linux.tar.gz -C /usr/local/

[root@k8s01 soft]# cd /usr/local/mycat/conf/
[root@k8s01 conf]# vim schema.xml
[root@k8s01 conf]# vim server.xml
[root@k8s01 conf]# ../bin/mycat restart

Stopping Mycat-server…

Mycat-server was not running.

Starting Mycat-server…

[root@k8s01 conf]# netstat -antulp | grep 9066

tcp6 0 0 :::9066 :::* LISTEN 100087/java

[root@k8s01 conf]#
7.使用Mycat验证读，写数据(1).查看管理端口服务

(2).查看数据，如果想要看负载均衡效果，必须退出终端，再登陆。

(3).k8s01节点写入数据，k8s02和k8s03读数据

8.k8s01节点宕机后，k8s02节点负责写入数据，k8s03读数据
[root@k8s01 conf]# systemctl stop mysql@bootstrap.service
[root@k8s01 conf]# netstat -antulp | grep 3306

tcp6 0 0 10.4.132.50:60568 10.4.132.42:3306 ESTABLISHED 100087/java

tcp6 0 0 10.4.132.50:51072 10.4.132.66:3306 ESTABLISHED 100087/java

[root@k8s01 conf]# ps -ef | grep mysqld

root 115559 33815 0 16:58 pts/0 00:00:00 grep –color=auto mysqld

(2).写入节点是k8s02，读节点是k8s03

错误处理:
(1).Mysql没有初使化数据

2019-11-15T06:33:04.385659Z 0 [ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘mysql.user’ doesn’t exist

2019-11-15T06:33:04.385668Z 0 [ERROR] Fatal error: Failed to initialize ACL/grant/time zones structures or failed to remove temporary table files.

2019-11-15T06:33:04.385687Z 0 [ERROR] Aborting
解决方法：
[root@k8s01 conf]# mysql_install_db –defaults-file=/etc/percona-xtradb-cluster.cnf –datadir=/var/lib/mysql –需要初使化数据
(2).第一个节点第一次启动必须要创建新的集群
2019-11-15T06:41:35.761089Z 0 [Note] WSREP: Current view of cluster as seen by this node

view ((empty))

2019-11-15T06:41:35.761280Z 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():159

2019-11-15T06:41:35.761309Z 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():209: Failed to open backend connection: -110 (Connection timed out)

2019-11-15T06:41:35.761583Z 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1514: Failed to open channel ‘pxc_1’ at ‘gcomm://192.168.54.128,192.168.54.129,192.168.54.130’: -110 (Connection timed out)

2019-11-15T06:41:35.761597Z 0 [ERROR] WSREP: gcs connect failed: Connection timed out

2019-11-15T06:41:35.761600Z 0 [ERROR] WSREP: Provider/Node (gcomm://192.168.54.128,192.168.54.129,192.168.54.130) failed to establish connection with cluster (reason: 7)

2019-11-15T06:41:35.761603Z 0 [ERROR] Aborting
解决方法：
(3).没有创建wsrep.cnf用户名

2019-11-15T07:27:59.158666Z 0 [ERROR] WSREP: Command did not run: wsrep_sst_xtrabackup-v2 –role ‘donor’ –address ‘192.168.54.129:4444/xtrabackup_sst//1’ –socket ‘/var/lib/mysql/mysql.sock’ –datadir ‘/var/lib/mysql/’ –defaults-file ‘/etc/my.cnf’ –defaults-group-suf

fix ” –mysqld-version ‘5.7.27-30-57’ ” –gtid ’19a21dce-0776-11ea-8879-92a989219bb1:2’2019-11-15T07:27:59.159302Z 0 [Warning] WSREP: Protocol violation. JOIN message sender 0.0 (k8s01) is not in state transfer (SYNCED). Message ignored.

2019-11-15T07:27:59.159405Z 5 [Note] WSREP: Synchronized with group, ready for connections
解决方法：
[root@k8s01 conf]# grep sst /etc/percona-xtradb-cluster.conf.d/wsrep.cnf

wsrep_sst_method=xtrabackup-v2

wsrep_sst_auth=”sstuser:s3cretPass”

[root@k8s01 conf]#
mysql> exit

Bye

[root@k8s01 ~]#

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