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mysql2

技术小胖子 2017-11-12 15:47:00 浏览865
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主从复制结构、半同步复制、双主复制结构、利用SSL实现安全的MySQL主从复制

一、主从复制结构实验

1.主服务器配置

可以先更改server_id

在/etc/my.cnf文件中,添加

server_id=11

重启服务,在mysql命令行查看

MariaDB [(none)]> select @@server_id;

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

| @@server_id |

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

| 11 |

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

1 row in set (0.00 sec)

授权从服务器

MariaDB [(none)]> grant replication slave,replication client on . to 'repluser'@'172.16.1.10'identified by 'replpass';

Query OK, 0 rows affected (0.00 sec)

刷新

MariaDB [(none)]> flush privileges;

Query OK, 0 rows affected (0.00 sec)

2.从服务器配置

在[mysqld]段落添加

server_id=22

relay_log=/var/log/mariadb/relay-log

skip_name_resolve=ON

innodb_file_per_table=ON

重启服务,在mysql命令行查看

MariaDB [(none)]> select @@server_id;

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

| @@server_id |

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

| 22 |

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

1 row in set (0.00 sec)

指定主服务器

MariaDB [(none)]> change master to master_host='172.16.1.4',master_user='repluser',master_password='replpass',master_log_file='binlog.000001',master_log_pos=245;

查看相关信息

MariaDB [(none)]> show slave status\G;

开启io线程

MariaDB [(none)]> start slave io_thread;

开启sql线程

MariaDB [(none)]> start slave sql_thread;

于是就可以在主服务器上插入信息,在从服务器上看到了。


二、半同步复制结构实验

从MySQL5.5开始,MySQL以插件的形式支持半同步复制。如何理解半同步呢?首先我们来看看异步,全同步的概念

异步复制(Asynchronous replication)

MySQL默认的复制即是异步的,主库在执行完客户端提交的事务后会立即将结果返给给客户端,并不关心从库是否已经接收并处理,这样就会有一个问题,主如果crash掉了,此时主上已经提交的事务可能并没有传到从上,如果此时,强行将从提升为主,可能导致新主上的数据不完整。

全同步复制(Fully synchronous replication)

指当主库执行完一个事务,所有的从库都执行了该事务才返回给客户端。因为需要等待所有从库执行完该事务才能返回,所以全同步复制的性能必然会收到严重的影响。

半同步复制(Semisynchronous replication)

介于异步复制和全同步复制之间,主库在执行完客户端提交的事务后不是立刻返回给客户端,而是等待至少一个从库接收到并写到relay log中才返回给客户端。相对于异步复制,半同步复制提高了数据的安全性,同时它也造成了一定程度的延迟,这个延迟最少是一个TCP/IP往返的时间。所以,半同步复制最好在低延时的网络中使用。

在主从复制搭建的基础上,做配置修改

1.主服务器:配置文件

[root@zrs6 ~]# vim /etc/my.cnf

server_id=11

relay_log=/var/log/mariadb/relay-log

skip_name_resolve=ON

innodb_file_per_table=ON

log_bin=/var/log/mariadb/binlog

重启

[root@zrs6 ~]# systemctl restart mariadb

安装插件

MariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master';

查看相应变量

MariaDB [(none)]> show global variables like '%rpl_semi%';

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

| Variable_name | Value |

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

| rpl_semi_sync_master_enabled | OFF |

| rpl_semi_sync_master_timeout | 10000 |

| rpl_semi_sync_master_trace_level | 32 |

| rpl_semi_sync_master_wait_no_slave | ON |

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

查看半同步的状态

MariaDB [(none)]> show global status like '%rpl_semi%';

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

| Variable_name | Value |

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

| Rpl_semi_sync_master_clients | 0 |

| Rpl_semi_sync_master_net_avg_wait_time | 0 |

| Rpl_semi_sync_master_net_wait_time | 0 |

| Rpl_semi_sync_master_net_waits | 0 |

| Rpl_semi_sync_master_no_times | 0 |

| Rpl_semi_sync_master_no_tx | 0 |

| Rpl_semi_sync_master_status | OFF |

| Rpl_semi_sync_master_timefunc_failures | 0 |

| Rpl_semi_sync_master_tx_avg_wait_time | 0 |

| Rpl_semi_sync_master_tx_wait_time | 0 |

| Rpl_semi_sync_master_tx_waits | 0 |

| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |

| Rpl_semi_sync_master_wait_sessions | 0 |

| Rpl_semi_sync_master_yes_tx | 0 |

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

开启半同步复制

MariaDB [(none)]> set @@global.rpl_semi_sync_master_enabled=ON;

2.从服务器:配置文件

[root@zrs5 ~]# vim /etc/my.cnf

server_id=22

relay_log=/var/log/mariadb/relay-log

skip_name_resolve=ON

innodb_file_per_table=ON

log_bin=/var/log/mariadb/bin-log

重启

[root@zrs5 ~]# systemctl restart mariadb

安装插件

MariaDB [(none)]> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';

查看相应变量

MariaDB [(none)]> show global variables like '%rpl_semi%';

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

| Variable_name | Value |

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

| rpl_semi_sync_slave_enabled | OFF |

| rpl_semi_sync_slave_trace_level | 32 |

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

开启半同步

MariaDB [(none)]> set @@global.rpl_semi_sync_slave_enabled=ON;

3.查看主服务器的状态

MariaDB [(none)]> show global status like '%rpl_semi%';

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

| Variable_name | Value |

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

| Rpl_semi_sync_master_clients | 1 |

| Rpl_semi_sync_master_net_avg_wait_time | 0 |

| Rpl_semi_sync_master_net_wait_time | 0 |

| Rpl_semi_sync_master_net_waits | 0 |

| Rpl_semi_sync_master_no_times | 0 |

| Rpl_semi_sync_master_no_tx | 0 |

| Rpl_semi_sync_master_status | ON |

| Rpl_semi_sync_master_timefunc_failures | 0 |

| Rpl_semi_sync_master_tx_avg_wait_time | 0 |

| Rpl_semi_sync_master_tx_wait_time | 0 |

| Rpl_semi_sync_master_tx_waits | 0 |

| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |

| Rpl_semi_sync_master_wait_sessions | 0 |

| Rpl_semi_sync_master_yes_tx | 0 |

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

4.当在主服务器添加数据时

MariaDB [(none)]> use zrs05;

MariaDB [zrs05]> insert into tb1 (Username,Age) values ('Zhang san',30),('Li si',27);

MariaDB [zrs05]> select * from tb1;

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

| UID | Username | Age |

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

| 1 | Zhang san | 30 |

| 2 | Li si | 27 |

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

在从服务器查看,数据已经同步了。

MariaDB [(none)]> use zrs05;

MariaDB [zrs05]> select * from tb1;

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

| UID | Username | Age |

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

| 1 | Zhang san | 30 |

| 2 | Li si | 27 |

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

5.验证半同步

需要在从服务器上先停止slave io_thread

MariaDB [zrs05]> stop slave io_thread;

当在主服务器上再次插入一条信息的时候,可以看到并不能立即插入成功,过了十秒钟后,才成功,主服务器被阻塞一段时间,说明半同步复制已经正常工作。

MariaDB [zrs05]> insert into tb1 (Username,Age) values ('Wang wu',33);

Query OK, 1 row affected (10.01 sec)

在从服务器上查看,并没有刚才插入的信息

MariaDB [zrs05]> select * from tb1;

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

| UID | Username | Age |

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

| 1 | Zhang san | 30 |

| 2 | Li si | 27 |

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

当开启slave io_thread后,那条信息就出现了

MariaDB [zrs05]> start slave io_thread;

MariaDB [zrs05]> select * from tb1;

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

| UID | Username | Age |

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

| 1 | Zhang san | 30 |

| 2 | Li si | 27 |

| 3 | Wang wu | 33 |

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


三、主主复制模型实验

1.两台服务器的配置文件

Server1:/etc/my.cnf

[mysqld]

innodb-file-per-table = ON

skip-name-resolve=ON

log_bin=/var/log/mariadb/binlog

server_id=11

relay_log=/var/log/mariadb/relaylog

auto_increment_offset=1

auto_increment_increment=2

Server2:/etc/my.cnf

[mysqld]

innodb-file-per-table = ON

skip-name-resolve=ON

log_bin=/var/log/mariadb/binlog

server_id=22

relay_log=/var/log/mariadb/relaylog

auto_increment_offset=2

auto_increment_increment=2

2.两台服务器的SQL语句

Server1:

mysql> grant replication slave,replication client on . to 'repluser'@'172.16.1.3' identified by 'replpass';

mysql> change master to master_host='172.16.1.3',master_user='repluser',master_password='replpass',master_log_file='bin-log.000001',master_log_pos=427;

mysql> start slave [io_thread|sql_thread];

Server2:

mysql> grant replication slave,replication client on . to 'repluser'@'172.16.1.2' identified by 'replpass';

mysql> change master to master_host='172.16.1.2',master_user='repluser',master_password='replpass',master_log_file='bin-log.000024',master_log_pos=245;

mysql> start slave [io_thread|sql_thread];


四、利用SSL实现安全的MySQL主从复制

MySQL的主从复制是直接利用明文传输的,如果我们在生产环境下,跨网络传输会非常不安全,所以就需要基于SSL加密传输,提高安全性。

1.修改配置文件

在Master上:

vim /etc/my.cnf

[mysqld]

log-bin=master-bin

binlog_format=mixed

server-id=1

ssl

[root@zj07 ~]# systemctl restart mariadb

在Slave上:

vim /etc/my.cnf

[mysqld]

log-bin=slave-bin

binlog_format=mixed

server-id=10

ssl

[root@zj08 ~]# systemctl restart mariadb

2.将master服务器自己做成CA服务器

[root@zj07 ~]# cd /etc/pki/CA/

[root@zj07 CA]# (umask 077;openssl genrsa -out private/cakey.pem 2048)

Generating RSA private key, 2048 bit long modulus

...........+++

................................................................+++

e is 65537 (0x10001)

[root@zj07 CA]#

[root@zj07 CA]# openssl req -new -x509 -key private/cakey.pem -out cacert.pem -days 365

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter '.', the field will be left blank.


Country Name (2 letter code) [XX]:CN

State or Province Name (full name) []:HeBei

Locality Name (eg, city) [Default City]:QinHuangdao

Organization Name (eg, company) [Default Company Ltd]:zrs.com

Organizational Unit Name (eg, section) []:tech

Common Name (eg, your name or your server's hostname) []:master.zrs.com

Email Address []:

[root@zj07 CA]# touch index.txt

[root@zj07 CA]# echo 01 > serial

3.为master创建证书申请并由CA服务器签发证书

[root@zj07 CA]# mkdir -pv /usr/local/mysql/ssl

mkdir: 已创建目录 "/usr/local/mysql"

mkdir: 已创建目录 "/usr/local/mysql/ssl"

[root@zj07 CA]#

[root@zj07 CA]# cd /usr/local/mysql/ssl/

[root@zj07 ssl]# (umask 077;openssl genrsa -out master.key 2048)

Generating RSA private key, 2048 bit long modulus

...........................................................................................................................................+++

..............+++

e is 65537 (0x10001)

[root@zj07 ssl]# openssl req -new -key master.key -out master.csr -days 365

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter '.', the field will be left blank.


Country Name (2 letter code) [XX]:CN

State or Province Name (full name) []:HeBei

Locality Name (eg, city) [Default City]:QinHuangdao

Organization Name (eg, company) [Default Company Ltd]:zrs.com

Organizational Unit Name (eg, section) []:tech

Common Name (eg, your name or your server's hostname) []:master.zrs.com

Email Address []:

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:

An optional company name []:

[root@zj07 ssl]#

[root@zj07 ssl]# openssl ca -in master.csr -out master.crt -days 365

Using configuration from /etc/pki/tls/openssl.cnf

Check that the request matches the signature

Signature ok

Certificate Details:

    Serial Number: 1 (0x1)

    Validity

        Not Before: Jan 15 13:35:39 2018 GMT

        Not After : Jan 15 13:35:39 2019 GMT

    Subject:

        countryName               = CN

        stateOrProvinceName       = HeBei

        organizationName          = zrs.com

        organizationalUnitName    = tech

        commonName                = master.zrs.com

    X509v3 extensions:

        X509v3 Basic Constraints: 

            CA:FALSE

        Netscape Comment: 

            OpenSSL Generated Certificate

        X509v3 Subject Key Identifier: 

            31:F0:A8:85:CD:6C:29:EF:3A:70:E6:C8:BB:5F:B4:04:61:32:86:48

        X509v3 Authority Key Identifier: 

            keyid:66:56:36:59:90:6D:94:DC:4E:19:A3:BA:2C:1E:53:DC:1A:8A:58:AE

Certificate is to be certified until Jan 15 13:35:39 2019 GMT (365 days)

Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y

Write out database with 1 new entries

Data Base Updated

[root@zj07 ssl]#

4.为slave服务器创建证书申请

[root@zrs08 ~]# mkdir -pv /usr/local/mysql/ssl

mkdir: 已创建目录 "/usr/local/mysql"

mkdir: 已创建目录 "/usr/local/mysql/ssl"

[root@zrs08 ~]# cd /usr/local/mysql/ssl/

[root@zrs08 ssl]# (umask 077;openssl genrsa -out slave.key 2048)

Generating RSA private key, 2048 bit long modulus

....+++

...................................................................................................+++

e is 65537 (0x10001)

[root@zrs08 ssl]# openssl req -new -key slave.key -out slave.csr -days 365

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter '.', the field will be left blank.


Country Name (2 letter code) [XX]:CN

State or Province Name (full name) []:HeBei

Locality Name (eg, city) [Default City]:QinHuangdao

Organization Name (eg, company) [Default Company Ltd]:zrs.com

Organizational Unit Name (eg, section) []:tech

Common Name (eg, your name or your server's hostname) []:slave.zrs.com

Email Address []:

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:

An optional company name []:

[root@zrs08 ssl]#

5.为slave服务器签署证书

将证书申请请求拷贝到CA服务器签署

在slave上

[root@zrs08 ssl]# scp slave.csr 172.16.1.7:/tmp/

在master上

[root@zj07 ssl]# openssl ca -in /tmp/slave.csr -out /tmp/slave.crt -days 365

Using configuration from /etc/pki/tls/openssl.cnf

Check that the request matches the signature

Signature ok

Certificate Details:

    Serial Number: 2 (0x2)

    Validity

        Not Before: Jan 15 13:41:19 2018 GMT

        Not After : Jan 15 13:41:19 2019 GMT

    Subject:

        countryName               = CN

        stateOrProvinceName       = HeBei

        organizationName          = zrs.com

        organizationalUnitName    = tech

        commonName                = slave.zrs.com

    X509v3 extensions:

        X509v3 Basic Constraints: 

            CA:FALSE

        Netscape Comment: 

            OpenSSL Generated Certificate

        X509v3 Subject Key Identifier: 

            90:B1:B5:44:92:99:24:4A:50:A7:AB:3F:36:B9:CD:C7:87:1E:CE:4A

        X509v3 Authority Key Identifier: 

            keyid:66:56:36:59:90:6D:94:DC:4E:19:A3:BA:2C:1E:53:DC:1A:8A:58:AE

Certificate is to be certified until Jan 15 13:41:19 2019 GMT (365 days)

Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y

Write out database with 1 new entries

Data Base Updated

6.签署好证书申请拷贝到slave服务器

[root@zj07 ssl]# scp /tmp/slave.crt 172.16.1.8:/usr/local/mysql/ssl

7.将CA证书拷贝到slave服务器一份并为master拷贝一份

[root@zj07 ssl]# scp /etc/pki/CA/cacert.pem 172.16.1.8:/usr/local/mysql/ssl/

[root@zj07 ssl]# cp /etc/pki/CA/cacert.pem /usr/local/mysql/ssl/

8.修改master和slave服务器证书属主、属组为"mysql"用户

在master上

[root@zj07 ssl]# chown -R mysql.mysql /usr/local/mysql/ssl/

[root@zj07 ssl]# ll /usr/local/mysql/ssl/

总用量 20

-rw-r--r--. 1 mysql mysql 1334 1月 15 21:45 cacert.pem

-rw-r--r--. 1 mysql mysql 4471 1月 15 21:36 master.crt

-rw-r--r--. 1 mysql mysql 1013 1月 15 21:34 master.csr

-rw-------. 1 mysql mysql 1679 1月 15 21:33 master.key

在slave上

[root@zrs08 ssl]# chown -R mysql.mysql /usr/local/mysql/ssl/

[root@zrs08 ssl]# ll /usr/local/mysql/ssl/

总用量 20

-rw-r--r--. 1 mysql mysql 1334 1月 15 21:45 cacert.pem

-rw-r--r--. 1 mysql mysql 4466 1月 15 21:43 slave.crt

-rw-r--r--. 1 mysql mysql 1009 1月 15 21:38 slave.csr

-rw-------. 1 mysql mysql 1679 1月 15 21:37 slave.key

9.在master与slave服务器修改主配置文件开启SSL加密功能

修改master数据库配置文件

[root@zj07 ssl]# vim /etc/my.cnf

ssl_ca=/usr/local/mysql/ssl/cacert.pem

ssl_cert=/usr/local/mysql/ssl/master.crt

ssl_key=/usr/local/mysql/ssl/master.key

[root@zj07 ssl]# systemctl restart mariadb

修改slave数据库配置文件

[root@zrs08 ssl]# vim /etc/my.cnf

ssl_ca=/usr/local/mysql/ssl/cacert.pem

ssl_cert=/usr/local/mysql/ssl/slave.crt

ssl_key=/usr/local/mysql/ssl/slave.key

[root@zrs08 ssl]# systemctl restart mariadb

10.在master服务器查看SSL加密是否开启,然后创建授权一个基于密钥认证的用户

MariaDB [(none)]> show variables like '%ssl%';

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

| Variable_name | Value |

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

| have_openssl | YES |

| have_ssl | YES |

| ssl_ca | /usr/local/mysql/ssl/cacert.pem |

| ssl_capath | |

| ssl_cert | /usr/local/mysql/ssl/master.crt |

| ssl_cipher | |

| ssl_key | /usr/local/mysql/ssl/master.key |

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

MariaDB [(none)]> grant replication client,replication slave on . to 'slave'@'172.16.1.8' identified by '12345678' require ssl;

MariaDB [(none)]> flush privileges;

11.查看master服务器二进制日志文件和事件位置用于的slave服务器链接从这个位置开始复制

MariaDB [(none)]> show master status;

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

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |

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

| master-bin.000002 | 502 | | |

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

12.测试使用加密用户指定的密钥链接服务器

在slave上

[root@zrs08 ~]# mysql -uroot -p12345678 -h 172.16.1.7 --ssl-ca=/usr/local/mysql/ssl/cacert.pem --ssl-cert=/usr/local/mysql/ssl/slave.crt --ssl-key=/usr/local/mysql/ssl/slave.key

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 41

Server version: 5.5.56-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

13.查看slave服务器SSL是否开启并连接master服务器

查看是否开启SSL

MariaDB [(none)]> show variables like '%ssl%';

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

| Variable_name | Value |

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

| have_openssl | YES |

| have_ssl | YES |

| ssl_ca | /usr/local/mysql/ssl/cacert.pem |

| ssl_capath | |

| ssl_cert | /usr/local/mysql/ssl/master.crt |

| ssl_cipher | |

| ssl_key | /usr/local/mysql/ssl/master.key |

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

链接master服务器

MariaDB [(none)]> change master to

-> master_host='172.16.1.7',master_user='slave',master_password='12345678',

-> master_log_file='master-bin.000002',master_log_pos=502,master_ssl=1,

-> master_ssl_ca='/usr/local/mysql/ssl/cacert.pem',

-> master_ssl_cert='/usr/local/mysql/ssl/slave.crt',

-> master_ssl_key='/usr/local/mysql/ssl/slave.key';

Query OK, 0 rows affected (0.04 sec)

帮助文档

MariaDB [(none)]> help change master to;

| MASTER_SSL = {0|1} #是否使用SSL功能

| MASTER_SSL_CA = 'ca_file_name' #CA证书位置

| MASTER_SSL_CERT = 'cert_file_name' #指定自己的证书文件

| MASTER_SSL_KEY = 'key_file_name' #指定自己的密钥文件

14.查看slave服务器的状态

MariaDB [(none)]> start slave;

Query OK, 0 rows affected (0.02 sec)

MariaDB [(none)]> show slave status\G;

1. row

           Slave_IO_State: Waiting for master to send event

              Master_Host: 172.16.1.7

              Master_User: slave

              Master_Port: 3306

            Connect_Retry: 60

          Master_Log_File: master-bin.000002

      Read_Master_Log_Pos: 2028

           Relay_Log_File: mariadb-relay-bin.000002

            Relay_Log_Pos: 2056

    Relay_Master_Log_File: master-bin.000002

         Slave_IO_Running: Yes

        Slave_SQL_Running: Yes

          Replicate_Do_DB: 

      Replicate_Ignore_DB: 

       Replicate_Do_Table: 

   Replicate_Ignore_Table: 

  Replicate_Wild_Do_Table: 

Replicate_Wild_Ignore_Table:

               Last_Errno: 0

               Last_Error: 

             Skip_Counter: 0

      Exec_Master_Log_Pos: 2028

          Relay_Log_Space: 2352

          Until_Condition: None

           Until_Log_File: 

            Until_Log_Pos: 0

       Master_SSL_Allowed: Yes

       Master_SSL_CA_File: /usr/local/mysql/ssl/cacert.pem

       Master_SSL_CA_Path: 

          Master_SSL_Cert: /usr/local/mysql/ssl/slave.crt

        Master_SSL_Cipher: 

           Master_SSL_Key: /usr/local/mysql/ssl/slave.key

    Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

            Last_IO_Errno: 0

            Last_IO_Error: 

           Last_SQL_Errno: 0

           Last_SQL_Error: 

Replicate_Ignore_Server_Ids:

         Master_Server_Id: 1

1 row in set (0.00 sec)

15.利用SSL实现安全的MySQL主从复制

在master服务器上创建数据库

[root@zj07 ~]# mysql -uroot -p12345678 -e 'create database this_is_a_test_db;'

[root@zj07 ~]# mysql -uroot -p12345678 -e 'show databases';

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

| Database |

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

| information_schema |

| mysql |

| performance_schema |

| this_is_a_test_db |

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

登录slave服务器验证slave数据库是否存在

[root@zrs08 ~]# mysql -uroot -p12345678 -e 'show databases';

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

| Database |

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

| information_schema |

| mysql |

| performance_schema |

| this_is_a_test_db |

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




      本文转自Vincent一马 51CTO博客,原文链接:http://blog.51cto.com/mazhenbo/2084358,如需转载请自行联系原作者



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