Mariadb galera 群集

环境:  CentOS 7 x64  *  3

IP : 192.168.0.100

IP : 192.168.0.101

IP : 192.168.0.102

配置mariadb YUM 源

http://yum.mariadb.org/10.0.15/rhel7-amd64/rpms/

分别下载软件 MariaDB-Galera-10.0.15

wget http://mirrors.neusoft.edu.cn/mariadb/mariadb-galera-10.0.15/source/mariadb-galera-10.0.15.tar.gz

vi /etc/yum.repos.d/mariadb.repo

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[mariadb]

name = MariaDB

baseurl = http://yum.mariadb.org/10.0.15/centos7-amd64/

enabled = 1

gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB

gpgcheck=1

------------------------------------------------------------------------------

yum makecache

yum -y install galera MariaDB-client socat cmake lsof perl-DBD-MySQL perl-Digest-MD5 perl-Time-HiRes rsync libev zlib-devel

rpm -ivh percona-xtrabackup-2.2.8-5059.el7.x86_64.rpm

/usr/sbin/groupadd mysql

/usr/sbin/useradd -g mysql mysql

mkdir -p /opt/local/mysql/data

mkdir -p /opt/local/mysql/binlog

mkdir -p  /opt/local/mysql/logs

mkdir -p /opt/local/mysql/relaylog

mkdir -p /var/lib/mysql

mkdir -p /opt/local/mysql/wsrep

tar zxvf mariadb-galera-10.0.15.tar.gz

cd mariadb-10.0.15

cmake -DCMAKE_INSTALL_PREFIX="/opt/local/mysql" -DDEFAULT_CHARSET=utf8 -DMYSQL_DATADIR="/opt/local/mysql/data/" -DCMAKE_INSTALL_PREFIX="/opt/local/mysql" -DINSTALL_PLUGINDIR=plugin -DWITH_INNOBASE_STORAGE_ENGINE=1 -DDEFAULT_COLLATION=utf8_general_ci -DENABLE_DEBUG_SYNC=0 -DENABLED_LOCAL_INFILE=1 -DENABLED_PROFILING=1 -DWITH_ZLIB=system -DWITH_EXTRA_CHARSETS=none -DMYSQL_MAINTAINER_MODE=OFF -DEXTRA_CHARSETS=all -DWITH_FAST_MUTEXES=ON -DWITH_PERFSCHEMA_STORAGE_ENGINE=1 -DWITH_MYISAM_STORAGE_ENGINE=1

make -j `cat /proc/cpuinfo | grep processor| wc -l`

make install

chmod +w /opt/local/mysql

chown -R mysql:mysql /opt/local/mysql

chmod +w /var/lib/mysql

chown -R mysql:mysql /var/lib/mysql

cp /opt/software/my.cnf /opt/local/mysql/my.cnf

./scripts/mysql_install_db --defaults-file=/opt/local/mysql/my.cnf --basedir=/opt/local/mysql --datadir=/opt/local/mysql/data --user=mysql

cp ./support-files/mysql.server  /etc/init.d/mysqld

chmod 755 /etc/init.d/mysqld

echo 'basedir=/opt/local/mysql/' >> /etc/init.d/mysqld

echo 'datadir=/opt/local/mysql/data' >>/etc/init.d/mysqld

service mysqld start

ln -s /opt/local/mysql/lib/mysql /usr/lib/mysql

ln -s /opt/local/mysql/include/mysql /usr/include/mysql

ln -s /opt/local/mysql/bin/mysql /usr/bin/mysql

ln -s /opt/local/mysql/bin/mysqldump /usr/bin/mysqldump

ln -s /opt/local/mysql/bin/myisamchk /usr/bin/myisamchk

ln -s /opt/local/mysql/bin/mysqld_safe /usr/bin/mysqld_safe

ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock

/opt/local/mysql/bin/mysqladmin -u root password 'rldb123'

chkconfig mysqld on

/opt/local/mysql/bin/mysql_secure_installation              #mysql 安全加固

# 登陆数据库，授权用于集群同步的用户和密码

/opt/local/mysql/bin/mysql -uroot -p

GRANT ALL PRIVILEGES ON *.* TO 'sst'@'localhost' IDENTIFIED BY 'rldb123';

GRANT ALL PRIVILEGES ON *.* TO 'sst'@'同步ip' IDENTIFIED BY 'rldb123';

FLUSH PRIVILEGES;

# 配置wsrep.cnf文件

cp /opt/local/mysql/support-files/wsrep.cnf /opt/local/mysql/wsrep

vi /opt/local/mysql/wsrep/wsrep.cnf

修改如下

wsrep_provider=/usr/lib64/galera/libgalera_smm.so

wsrep_cluster_address="gcomm://"

wsrep_sst_auth=sst:rldb123

wsrep_sst_method=xtrabackup

wsrep_node_address=192.168.0.100

# 注意:

#    "gcomm://" 是特殊的地址,仅仅是Galera cluster初始化启动时候使用。

#    如果集群启动以后，我们关闭了第一个节点，那么再次启动的时候必须先修改，"gcomm://"为其他节点的集群地址,

例如 wsrep_cluster_address="gcomm://192.168.0.101:4567"

vi /opt/local/mysql/my.cnf

在[client] 下面 增加

!includedir /opt/local/mysql/wsrep

配置完成以后，重启mysqld

service mysqld restart

netstat -tulpn |grep -e 4567 -e 3306

登录mysql 查看 global 的 status 

/opt/local/mysql/bin/mysql -uroot -p

show global status like '%state%';

+-------------------------------------------+--------------------------------------+

| Variable_name                             | Value                                |

+-------------------------------------------+--------------------------------------+

| Performance_schema_statement_classes_lost | 0                                    |

| wsrep_local_state_uuid                    | b74966e2-a20a-11e4-96f1-c6bffca5b0ea |

| wsrep_local_state                         | 4                                    |

| wsrep_local_state_comment                 | Synced                               |

| wsrep_cluster_state_uuid                  | b74966e2-a20a-11e4-96f1-c6bffca5b0ea |

+-------------------------------------------+--------------------------------------+

接下来就是 其他节点的添加！  步骤大概相同

构造新节点的操作步骤如下:

1.安装MariaDB和Galera library

2.wsrep_cluster_address的配置不一样:

wsrep_cluster_address="gcomm://Node-A-IP,Node-B-IP"   # 这里指向是指上一层的集群地址

3.重起MariaDB

所有节点配置完成以后,更改节点1的 wsrep_cluster_address="gcomm://" 为其他IP

并 加入 仲裁人

"仲裁人"节点上没有数据,它在集群中的作用就是在集群发生分裂时进行仲裁，集群中可以有多个"仲裁人"节点。

"仲裁人"节点加入集群的方法如下:

garbd -a gcomm://192.168.0.100:4567 -g my_wsrep_cluster -d

# 注释：参数说明: -d：以daemon模式运行 -a：集群地址 -g： 集群名称

测试集群是否配置好参数：登陆数据库：查看如下几个参数：

SHOW VARIABLES LIKE 'wsrep_cluster_address';

# 这个查看wsrep的相关参数

show status like 'wsrep%';

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配置相同，出现无法启动同步的时候，通常都是因为权限问题。

所有节点都执行授权.

chmod +w /opt/local/mysql

chown -R mysql:mysql /opt/local/mysql

然后再启动同步..

启动完成以后，再次执行授权命令..

通常是因为 data 目录下面的 ib_logfile0 ib_logfile1 ib_logfile2 为root 权限 所以不能同步，导致的。

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