mysql主从复制读写分离的配置方法详解

egrep -v '(^$|^#)' /usr/local/mysql/etc/my.cnf

[mysqld]
datadir=/data1/mysqldb
socket=/tmp/mysql.sock
key_buffer_size   = 16M
max_allowed_packet  = 16M
thread_stack   = 192K
thread_cache_size  = 8
query_cache_limit  = 1M
query_cache_size  = 64M
query_cache_type  = 1
symbolic-links=0
innodb_file_per_table=ON
skip_name_resolve=ON

server-id  = 1
log_bin   = /data1/mysqldb/mysql-bin.log
[mysqld_safe]
log-error=/usr/local/mysql/logs/error.log
pid-file=/data1/mysqldb/mysql.pid
!includedir /usr/local/mysql/etc/my.cnf.d

mysql > grant replication client,replication slave on *.* to 'repluser'@'172.16.3.%' identified by 'replpass';
mysql > flush privileges;
mysql >show master logs;
+------------------+-----------+
| Log_name   | File_size |
+------------------+-----------+
| mysql-bin.000001 |  622 |

egrep -v '(^$|^#)' /usr/local/mysql/etc/my.cnf

[mysqld]
datadir=/data1/mysqldb
socket=/data1/mysqldb/mysql.sock
key_buffer_size   = 16M
max_allowed_packet  = 16M
thread_stack   = 192K
thread_cache_size  = 8
query_cache_limit  = 1M
query_cache_size  = 64M
query_cache_type  = 1
symbolic-links=0

innodb_file_per_table=ON
skip_name_resolve=ON

server-id    = 11   #从节点标识ID 各从节点均不一样 
relay_log = relay-log
read_Only=ON

[mysqld_safe]
log-error=/usr/local/mysql/log/error.log
pid-file=/var/run/mysql/mysql.pid
!includedir /usr/local/mysql/etc/my.cnf.d

mysql > CHANGE MASTER TO MASTER_HOST="172.16.3.175",MASTER_USER="repluser",MASTER_PASSWORD="replpass",MASTER_PORT=3306,MASTER_LOG_FILE="mysql-bin.000001",MASTER_LOG_POS=622;
mysql > start slave;  #启动从节点()

#查看从节点状态
mysql > SHOW SLAVE STATUS;
*************************** 1. row ***************************
    Slave_IO_State: Waiting for master to send event
     Master_Host: 172.16.3.175     #主节点
     Master_User: repluser       #同步账号
     Master_Port: 3306
    Connect_Retry: 60
    Master_Log_File: mysql-bin.000001
   Read_Master_Log_Pos: 622
    Relay_Log_File: relay-log.000001
    Relay_Log_Pos: 582
  Relay_Master_Log_File: mysql-bin.000001
    Slave_IO_Running: Yes      #同步线程正常
   Slave_SQL_Running: Yes     #本地写线程正常
    Replicate_Do_DB:        #同步过滤为空(可以只同步某个或某些库)
   Replicate_Ignore_DB:        #不同步的库
   Replicate_Do_Table:      
  Replicate_Ignore_Table: 
  Replicate_Wild_Do_Table: 
 Replicate_Wild_Ignore_Table: 
     Last_Errno: 0    #最后同步的错误 0表示正常同步
     Last_Error: 
     Skip_Counter: 0
   Exec_Master_Log_Pos: 622
    Relay_Log_Space: 615
    Until_Condition: None
    Until_Log_File: 
    Until_Log_Pos: 0
   Master_SSL_Allowed: No
   Master_SSL_CA_File: 
   Master_SSL_CA_Path: 
    Master_SSL_Cert: 
   Master_SSL_Cipher: 
    Master_SSL_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
     Master_UUID: 57017c43-36e3-11e8-ac76-080027393fc7
    Master_Info_File: /data1/mysqldb/master.info
     SQL_Delay: 0
   SQL_Remaining_Delay: NULL
  Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
   Master_Retry_Count: 86400
     Master_Bind: 
  Last_IO_Error_Timestamp: 
  Last_SQL_Error_Timestamp: 
    Master_SSL_Crl: 
   Master_SSL_Crlpath: 
   Retrieved_Gtid_Set: 
   Executed_Gtid_Set: 
    Auto_Position: 0
   Replicate_Rewrite_DB: 
     Channel_Name: 
   Master_TLS_Version: 
1 row in set (0.00 sec)
ERROR: 
No query specified

[root@db1 ~]# mysql  show databases;
+--------------------+
| Database   |
+--------------------+
 study    |
+--------------------+
5 rows in set (0.00 sec)
###study测试数据库导入成功
mysql> use study;
Database changed
mysql> show tables;
+-----------------+
| Tables_in_study |
+-----------------+
| class   |
| course   |
| part   |
| score   |
| student   |
| tb31   |
| tb32   |
| teacher   |
| test1   |
| test2   |
| user_info  |
+-----------------+
11 rows in set (0.00 sec)
#删除test1 test2表

mysql> show tables;
+-----------------+
| Tables_in_study |
+-----------------+
| class   |
| course   |
| part   |
| score   |
| student   |
| tb31   |
| tb32   |
| teacher   |
| user_info  |
+-----------------+
9 rows in set (0.00 sec)

[root@proxysql ~]# yum install proxysql-1.3.6-1-centos7.x86_64.rpm -y
[root@proxysql ~]# rpm -ql proxysql
/etc/init.d/proxysql
/etc/proxysql.cnf  #主配置文件
/usr/bin/proxysql
/usr/share/proxysql/tools/proxysql_galera_checker.sh
/usr/share/proxysql/tools/proxysql_galera_writer.pl

[root@proxysql ~]# egrep -v '(^$|^#)' /etc/proxysql.cnf

datadir="/var/lib/proxysql"
admin_variables=
{ 
 admin_credentials="admin:admin"    #proxysql自己的管理用户名密码
 mysql_ifaces="127.0.0.1:6032;/tmp/proxysql_admin.sock"
}
mysql_variables=
{
 threads=4       #线程数,建议和cpu核心数一致
 max_cOnnections=2048  #最大连接
 default_query_delay=0
 default_query_timeout=36000000
 have_compress=true
 poll_timeout=2000
 interfaces="0.0.0.0:3306;/tmp/proxysql.sock"    #对外接口
 default_schema="information_schema"
 stacksize=1048576
 server_version="5.5.30"
 connect_timeout_server=3000
 monitor_username="monitor"
 monitor_password="monitor"
 monitor_history=600000
 monitor_connect_interval=60000
 monitor_ping_interval=10000
 monitor_read_only_interval=1500
 monitor_read_only_timeout=500
 ping_interval_server_msec=120000
 ping_timeout_server=500
 commands_stats=true
 sessions_sort=true
 connect_retries_on_failure=10
}

#####主从节点的配置
mysql_servers =      
(
 {
  address = "172.16.3.175" # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  port = 3306   # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  hostgroup = 1   # 设置组号
  status = "ONLINE"  # default: ONLINE
  weight = 1   # default: 1
  compression = 0  # default: 0
  max_cOnnections= 200   ###定义最大的连接
 },
 {
  address = "172.16.3.235" # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  port = 3306   # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  hostgroup = 2   # no default, required
  status = "ONLINE"  # default: ONLINE
  weight = 1   # default: 1
  compression = 0  # default: 0
  max_cOnnections=1000
 },
 {
  address = "172.16.3.241" # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  port = 3306   # no default, required . If port is 0 , address is interpred as a Unix Socket Domain
  hostgroup = 2   # no default, required
  status = "ONLINE"  # default: ONLINE
  weight = 1   # default: 1
  compression = 0  # default: 0
  max_cOnnections=1000
 }
)
mysql_users:
(
 {
  username = "myadmin" # no default , required
  password = "mypass" # default: ''
  default_hostgroup = 1 # default: 0
  max_cOnnections=1000
  default_schema="test"
  active = 1   #是否激活
 }
)
mysql_query_rules:
(
)
scheduler=
(
)
mysql_replication_hostgroups=
(
  {
    writer_hostgroup=1   #定义写组号1
    reader_hostgroup=2  #定义读组号2
    comment="test repl 1" #注释内容
  }
)

模拟通过proxysql使用数据库
[root@proxysql ]# mysql -h172.16.3.175 -umyadmin -pmypass
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 17406
Server version: 5.7.21-log MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> 

mysql > show databases;
mysql> show databases;
+--------------------+
| Database   |
+--------------------+
| information_schema |
| mysql    |
| performance_schema |
| study    |
| sys    |
+--------------------+
5 rows in set (0.00 sec)
###删除study数据库user_info中6 -12之间的数据
删除之前:
mysql> select * from user_info;
+-----+-------+------+--------+----------+
| nid | name | age | gender | part_nid |
+-----+-------+------+--------+----------+
| 1 | san | 20 | 男  |  1 |
| 2 | dong | 29 | 男  |  2 |
| 4 | Ling | 28 | 男  |  4 |
| 5 | ling | 28 | 男  |  3 |
| 6 | dong | 30 | 男  |  1 |
| 7 | b  | 11 | 女  |  1 |
| 8 | c  | 12 | 女  |  1 |
| 9 | d  | 18 | 女  |  4 |
| 10 | e  | 22 | 男  |  3 |
| 11 | f  | 23 | 男  |  2 |
| 12 | dongy | 22 | 男  |  1 |
+-----+-------+------+--------+----------+
11 rows in set (0.00 sec)
删除之后:
mysql> delete from user_info where nid >6 and nid <12;
Query OK, 5 rows affected (0.03 sec)

mysql> select * from user_info;
+-----+-------+------+--------+----------+
| nid | name | age | gender | part_nid |
+-----+-------+------+--------+----------+
| 1 | san | 20 | 男  |  1 |
| 2 | dong | 29 | 男  |  2 |
| 4 | Ling | 28 | 男  |  4 |
| 5 | ling | 28 | 男  |  3 |
| 6 | dong | 30 | 男  |  1 |
| 12 | dongy | 22 | 男  |  1 |
+-----+-------+------+--------+----------+
6 rows in set (0.00 sec)

主节点:
类似如下:
[root@db1 ~]# tcpdump -i enp0s3 -nn tcp port 3306
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp0s3, link-type EN10MB (Ethernet), capture size 262144 bytes
18:04:34.678861 IP 172.16.3.254.42191 > 172.16.3.175.3306: Flags [S], seq 3385407732, win 29200, options [mss 1460,sackOK,TS val 17576713 ecr 0,nop,wscale 7], length 0
18:04:34.678908 IP 172.16.3.175.3306 > 172.16.3.254.42191: Flags [S.], seq 1579426335, ack 3385407733, win 28960, options [mss 1460,sackOK,TS val 29413673 ecr 17576713,nop,wscale 7], length 0
18:04:34.680902 IP 172.16.3.254.42191 > 172.16.3.175.3306: Flags [.], ack 1, win 229, options [nop,nop,TS val 17576715 ecr 29413673], length 0
18:04:34.681264 IP 172.16.3.175.3306 > 172.16.3.254.42191: Flags [P.], seq 1:83, ack 1, win 227, options [nop,nop,TS val 29413675 ecr 17576715], length 82
....
从节点:
类似如下:
[root@db2 data1]# tcpdump -i enp0s3 -nn tcp port 3306
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp0s3, link-type EN10MB (Ethernet), capture size 262144 bytes
18:02:57.932043 IP 172.16.3.254.42733 > 172.16.3.235.3306: Flags [S], seq 76520456, win 29200, options [mss 1460,sackOK,TS val 17479189 ecr 0,nop,wscale 7], length 0
...........

 [root@proxysql]# mysql -u admin -padmin -h 127.0.0.1 -P6032 --prompt='Admin> '
Admin> show databases;
+-----+---------+-------------------------------+
| seq | name | file       |
+-----+---------+-------------------------------+
| 0 | main |        |
| 2 | disk | /var/lib/proxysql/proxysql.db |
| 3 | stats |        |
| 4 | monitor |        |
+-----+---------+-------------------------------+
4 rows in set (0.00 sec)