centos7.2 mysql集群_Centos7.2下安装mysql-group-replication数据库集群
系統版本：Centos7.2 x64
數據庫版本：mysql5.7.17
1.首先安裝環境：
yum -y install gcc gcc-c++ libaio-devel boost-devel autoconf automake zlib-devel libxml2-devel ncurses-devel libgcrypt-devel libtool-devel openssl-devel bison-devel unzip numactl-devel
2.關閉selinux和防火墻
setenforce 0
systemctl stop firewalld
systemctl disabled firewalld
3.下載mysql安裝包
wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86_64.tar
解壓：
tar xf mysql-5.7.17-linux-glibc2.5-x86_64.tar
tar zxvf mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
將解壓后的文件夾移動到/user/local并且修改為mysql5.7
mv mysql-5.7.17-linux-glibc2.5-x86_64 mysql5.7
配置環境變量
mysql-5.7.17-linux-glibc2.5-x86_64.tar
source /etc/profile
5.創建data目錄和conf文件
進入mysql5.7
mkdir data/3306 data/3307 data/3308
mkdir conf
分別創建3306.cnf 3307.cnf 3308.cnf
6.實例化并且啟動mysql
實例化：
/usr/local/mysql5.7/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql5.7 --datadir=/usr/local/mysql5.7/data/3306
/usr/local/mysql5.7/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql5.7 --datadir=/usr/local/mysql5.7/data/3307
/usr/local/mysql5.7/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql5.7 --datadir=/usr/local/mysql5.7/data/3308
會報一些警告信息：
2018-06-14T03:17:32.915314Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-06-14T03:17:33.980961Z 0 [Warning] InnoDB: New log files created, LSN=45790
2018-06-14T03:17:34.192176Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2018-06-14T03:17:34.256360Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 7b29387c-6f81-11e8-abac-00163e06e59d.
2018-06-14T03:17:34.259013Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2018-06-14T03:17:34.259401Z 1 [Warning] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
分別啟動三個實例：
/usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3306.cnf &
/usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3307.cnf &
/usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3308.cnf &
查看mysql三個實例是否啟動成功
[root@iZm5e7kkxs23uutsa9dbl5Z mysql5.7]# ps -ef | grep mysqld
root 22236 9200 1 11:18 pts/0 00:00:00 /usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3306.cnf
root 22265 9200 2 11:18 pts/0 00:00:00 /usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3307.cnf
root 22294 9200 3 11:18 pts/0 00:00:00 /usr/local/mysql5.7/bin/mysqld --defaults-file=/usr/local/mysql5.7/conf/3308.cnf
root 22326 9200 0 11:18 pts/0 00:00:00 grep --color=auto mysqld
說明啟動成功
4.數據庫相關配置
進入3306節點，作為主節點
執行以下操作：
mysql -S /usr/local/mysql5.7/data/3306/mysqld.sock
mysql> set sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication slave,replication client on *.* to 'repluser'@'%' identified by 'replpass';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> change master to master_user='repluser',master_password='replpass' for channel 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.02 sec)
mysql> install plugin group_replication soname 'group_replication.so';
Query OK, 0 rows affected (0.01 sec)
mysql> set global group_replication_bootstrap_group=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> START group_replication;
Query OK, 0 rows affected (1.07 sec)
mysql> set global group_replication_bootstrap_group=OFF;
Query OK, 0 rows affected (0.00 sec)
mysql> exit;
進入3307節點
mysql -S /usr/local/mysql5.7/data/3307/mysqld.sock
mysql> set sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication slave,replication client on *.* to 'repluser'@'%' identified by 'replpass';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> set sql_log_bin=1;
Query OK, 0 rows affected (0.00 sec)
mysql> change master to master_user='repluser',master_password='replpass' for channel 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.03 sec)
mysql> install plugin group_replication soname 'group_replication.so';
Query OK, 0 rows affected (0.00 sec)
mysql> START group_replication;
Query OK, 0 rows affected (5.59 sec)
mysql> exit;
進入3308節點：
mysql -S /usr/local/mysql5.7/data/3308/mysqld.sock
mysql> set sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)
mysql> grant replication slave,replication client on *.* to 'repluser'@'%' identified by 'replpass';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> set sql_log_bin=1;
Query OK, 0 rows affected (0.00 sec)
mysql> change master to master_user='repluser',master_password='replpass' for channel 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.03 sec)
mysql> install plugin group_replication soname 'group_replication.so';
Query OK, 0 rows affected (0.01 sec)
mysql> start group_replication;
Query OK, 0 rows affected (2.25 sec)
進入三個任意一個節點驗證：
mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------------------+-------------+--------------+
| group_replication_applier | 7b29387c-6f81-11e8-abac-00163e06e59d | iZm5e7kkxs23uutsa9dbl5Z | 3306 | ONLINE |
| group_replication_applier | 8badfa8f-6f81-11e8-aec3-00163e06e59d | iZm5e7kkxs23uutsa9dbl5Z | 3307 | ONLINE |
| group_replication_applier | 90f24e32-6f81-11e8-aef5-00163e06e59d | iZm5e7kkxs23uutsa9dbl5Z | 3308 | ONLINE |
+---------------------------+--------------------------------------+-------------------------+-------------+--------------+
3 rows in set (0.00 sec)
5.數據同步測試
進入到3306節點
mysql> create table tb_stu(id int not null primary key auto_increment,name varchar(50));
Query OK, 0 rows affected (0.02 sec)
mysql> select * from tb_stu;
+----+------+
| id | name |
+----+------+
| 1 | tom |
+----+------+
1 row in set (0.00 sec)
進入3307節點：
mysql> select * from tb_stu;
+----+------+
| id | name |
+----+------+
| 1 | tom |
+----+------+
1 row in set (0.00 sec)
同樣進入3308節點驗證：
mysql> select * from tb_stu;
+----+------+
| id | name |
+----+------+
| 1 | tom |
+----+------+
1 row in set (0.00 sec)
說明三個節點能夠進行數據同步。
加入我們在3307或者3308節點插入數據：
mysql> insert tb_stu(id,name) values (1,'tom');
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement
報錯原因是：3306是主節點，3307和3308是從節點，單主模式下只能在主節點寫入，從節點只能查詢數據。
下面我們在進行多主節點修改和增加節點。
轉載至鏈接:https://my.oschina.net/u/2477500/blog/1830407
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