mysql-cluster 安装配置
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mysql-cluster免编译包下载:https://dev.mysql.com/downloads/file/?id=469881
wget https://cdn.mysql.com//Downloads/MySQL-Cluster-7.5/mysql-cluster-gpl-7.5.6-linux-glibc2.5-x86_64.tar.gz
解压:
# tar xvf mysql-cluster-gpl-7.5.6-linux-glibc2.5-x86_64.tar.gz
# mv xvf mysql-cluster-gpl-7.5.6-linux-glibc2.5-x86_64 /soft/mysql
给mysql-cluster目录授权
#useradd -s mysql /sbin/nologin
# mkdir /soft/mysql/data
# chown -R mysql:mysql /soft/mysql/*
# chmod +x /soft/mysql/bin/ndb_mem*
# cd /soft/mysql/
# ln -s /soft/mysql/bin/ndb_mgmd /sbin/ndb_mgmd #方便在shell直接调用ndb_mgmd命令
# ln -s /soft/mysql/bin/ndb_mgm /sbin/ndb_mgm #方便在shell直接调用ndb_mgm命令
建立config.ini文件
# vim config.ini #内容如下,一定要注意格式。从windows复制过来的话记得用uft8编码
[NDBD DEFAULT]
NoOfReplicas=2 #每个数据节点的镜像数量
DataMemory=500M #每个数据节点中给数据分配的内存
IndexMemory=300M #每个数据节点中给索引分配的内存
[NDB_MGMD] #配置管理节点,[]后面不能有空格,也不能有注释
hostname=192.168.240.130
datadir=/soft/mysql/data #管理节点数据(日志)目录
[NDBD] #数据节点配置,[]后面不能有空格,也不能有注释
hostname=192.168.240.129
datadir=/soft/mysql/data
[NDBD]
hostname=192.168.240.127
datadir=/soft/mysql/data
[MYSQLD] #SQL节点目录,[]后面不能有空格,也不能有注释
hostname=192.168.240.129
[MYSQLD]
hostname=192.168.240.128
-------------------------------------------------------------------------------------------------------------------
[[email protected] mysql]# ./bin/ndb_mgmd -f config.ini #启动服务
MySQL Cluster Management Server mysql-5.7.18 ndb-7.5.6 #启动成功
[[email protected] mysql]# ./bin/ndb_mgm #进入管理程序,可以看到配置文件生效了,但因为没配置节点上的mysql,所以这里显示未连接
-- NDB Cluster -- Management Client --
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]2 node(s)
id=2 (not connected, accepting connect from 192.168.240.129)
id=3 (not connected, accepting connect from 192.168.240.127)
[ndb_mgmd(MGM)]1 node(s)
id=1@192.168.240.130 (mysql-5.7.18 ndb-7.5.6)
[mysqld(API)]2 node(s)
id=4 (not connected, accepting connect from 192.168.240.129)
id=5 (not connected, accepting connect from 192.168.240.128)
-------------------------------------------------------------------------------------------------------------------------------
配置节点: 192.168.240.128/192.168.240.129
[[email protected]]# useradd -s /sbin/nologin mysql
[[email protected]]# mkdir /soft/mysql
[[email protected]]# tar xf mysql-cluster-gpl-7.5.6-linux-glibc2.5-x86_64.tar.gz
[[email protected]]# mkdir /soft/mysql/data
[[email protected]]# chown -R mysql:mysql /soft/mysql
[[email protected]]# cd /soft/mysql
[[email protected] mysql]# yum install -y libaio*
vim support-files/mysql.server #修改服务文件
basedir=/soft/mysql
datadir=/soft/mysql/data
[[email protected] mysql]# bin/mysqld --initialize --user=mysql --basedir=/soft/mysql --datadir=/soft/mysql/data
./bin/mysqld --initialize --user=mysql --datadir=/soft/mysql/data --注意自动生成的临时密码
[Note] A temporary password is generated for [email protected]: pByj>rz95OhV
----------------------------------------------------------------------------------------------------------------------------------
先更改密码:
[[email protected] mysql]# bin/mysql -u root -p‘pByj>rz95OhV‘ --登录mysql,有特殊符号,要用‘‘括起来,在这里踏坑了
mysql> use mysql; --必须先更改密码才可以操作
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> alter user ‘root‘@‘localhost‘ identified by ‘123456‘;
Query OK, 0 rows affected (0.00 sec)
[[email protected]]# vim /etc/my.cnf
[mysqld]
datadir=/soft/mysql/data
user=mysql
ndbcluster
lc_messages-dir=/soft/mysql/share/
ndb-connectstring=192.168.240.130
[mysql_cluster]
ndb-connectstring=192.168.240.130
[[email protected]]# bin/ndbd --initial #第一次使用要初始化数据,下次不能加--initial,否则会清空数据库
[[email protected]]# ln -s /soft/mysql/bin /sbin/mysql
[[email protected]]# ln -s /soft/mysql/support-files/mysql.server /sbin/mysqld
----------------------------------------------------------------------------------------------------------------------------
回到130控制台:
ndb_mgm> show
Cluster Configuration
---------------------
[ndbd(NDB)]2 node(s)
id=2@192.168.61.128 (mysql-5.7.18 ndb-7.5.6, starting, Nodegroup: 0) --节点ndbd已连接
id=3@192.168.61.129 (mysql-5.7.18 ndb-7.5.6, starting, Nodegroup: 0) --节点ndbd已连接
[ndb_mgmd(MGM)]1 node(s)
id=1@192.168.61.130 (mysql-5.7.18 ndb-7.5.6)
[mysqld(API)]2 node(s)
[mysqld(API)]2 node(s)
id=4@192.168.61.128 (mysql-5.7.18 ndb-7.5.6) #小心防火墙
id=5@192.168.61.129 (mysql-5.7.18 ndb-7.5.6) #小心防火墙
-----------------------------------------------------------------------------------------------------------------------------
测试:
建库/建表
在192.168.61.128上登录mysql:
mysql>create databases abc charset=gbk;
Query OK, 0 rows affected (0.72 sec)
mysql>create table name(id int(5) not null primary key auto_increment,name varchar(10) not null ) engine=ndb;
Query OK, 0 rows affected (0.72 sec)
mysql>insert into name(name) values (‘张三‘),(‘李四‘);
-----------------------------------------------------------------------------------------------------------------------------
在192.168.240.128/192.168.240.129 进行查询
mysql>select * from tp.name;
+----+---------+
| id | name |
+----+----------+
| 1 | 张三 |
| 2 | 李四 |
+----+---------+
-----------------------------------------------------------------------------------------------------------------------------
模拟192.168.240.128/192.168.240.129故障之一失效,再查询
mysql>select * from tp.name;
+----+---------+
| id | name |
+----+----------+
| 1 | 张三 |
| 2 | 李四 |
+----+---------+
mysql>insert into name(name) values (‘长江‘),(‘黄河‘);
Query OK, 0 rows affected (0.72 sec)
mysql> select * from tp.name group by id;
+----+--------+
| id | name |
+----+--------+
| 1 | 长江 |
| 2 | 黄河 |
| 3 | 张三 |
| 4 | 李四 |
+----+--------+
4 rows in set (0.01 sec)
经过测试总结几点:
当cluster挂了后,两个数据节点的mysql都不能访问数据库;
当cluster挂了时,两个mysql还是可以正常工作的,更新数据也会同步,但不能重启mysql服务;
2.只要不是两个mysql服务同时挂了,数据还是安全的。
3.当cluster挂掉,节点A挂掉,这时往节点B上更新数据;cluster和节点A恢复上线后会造成节点A和节点B的数据不一致。
4.当两个mysql数据不一致时,先启动cluster,再启动数据更新的数据节点和SQL节点,确保已经成功连上cluster,最后再启动另一个节点,后一个节点会自动更新最新的数据。!!启动顺序很重要!!!
-----------------------------------------------------------------------------------------------------------------------------
启动顺序:
管理节点 ndb_megd -> 数据节点 ndbd -> SQL节点 指定ndbcluster 参数的专用mysqld
ndb_mgmd -f config.ini -> ndbd -> mysqld start
关闭顺序:
SQL节点 指定ndbcluster 参数的专用mysqld -> 管理节点 ndb_mem
mysqld stop --> ndb_mgm -e shutdown --> 完成
附:
1. mysqld --initialize-insecure自动生成无密码的root用户,mysqld --initialize自动生成带随机密码的root用户
2.用mysql帐号设置的话需要在 /etc/security/limits.conf 中追加下面信息,不然会提示limite限制错误:
mysql hard nofile 65535
3.[ERROR] Can‘t find error-message file ‘/usr/local/mysql/share/zh-cn/errmsg.sys‘. Check error-message file location and ‘lc-messages-dir‘ configuration directive.
在my.cnf里添加行:
lc_messages-dir=/soft/mysql/share/
4.启动mysql时,可能会提示:ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/tmp/mysql.sock‘ (111)
ln -s /soft/mysql/mysql.sock /tmp/mysql.sock #要用绝对路径
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