MySQL synchronous data configuration and shell script implementation

• mysql Synchronize configuration settings ：
  Both servers have mysql database , Modify the configuration file ：

		vim /etc/my.cnf		 The path to mysql Profile path 

Synchronization settings need to be configured server_id and replicate-do-db attribute , You need to configure the synchronization user ;

stay “[mysqld]” Add the name of the database to be synchronized under the section
For example, you need to synchronize radius library ：

				MySQL [(none)]> show databases;
				+--------------------+
				| Database           |
				+--------------------+
				| information_schema |
				| mysql              |
				| omc_pm_report      |
				| performance_schema |
				| **radius**         |
				| sas                |
				| sys                |
				+--------------------+
				8 rows in set (0.00 sec)

stay my.cnf Of [mysqld] Add the following configuration under section ：

[mysqld]
replicate-do-db=radius

To configure server-id

# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 1

According to the prompt , The active and standby cannot use the same server-id, My Lord here mysql Configure to 1, To prepare mysql Configure to 2, Other values are also acceptable ;
Come here , The configuration required by the configuration file has been configured .
Below is the configuration synchronization user ：
Give Way root The user to use password Connect from any host to the local mysql The server

GRANT ALL PRIVILEGES ON *.* TO "root"@"%" IDENTIFIED BY 'password' WITH GRANT OPTION;

stay mysql Configure... In command mode ：

			[[email protected] ~]# mysql -uroot -p password 
			Welcome to the MariaDB monitor.  Commands end with ; or \g.
			Your MySQL connection id is 2761
			Server version: 5.7.36-log MySQL Community Server (GPL)			
			Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.			
			Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.			
			MySQL [(none)]> **GRANT ALL PRIVILEGES ON *.* TO "root"@"%" IDENTIFIED BY ' password ' WITH GRANT OPTION;**
			MySQL [(none)]> flush privileges;

Remember to use flush privileges The configuration takes effect immediately ;
see root Is the configuration successful? ：

			MySQL [(none)]> select Host,User from mysql.user;
			+-------------+---------------+
			| Host        | User          |
			+-------------+---------------+
			| %           | root          |
			| localhost   | mysql.session |
			| localhost   | mysql.sys     |
			| localhost   | root          |
			+-------------+---------------+
			7 rows in set (0.00 sec)			
			MySQL [(none)]>

Configure the active / standby relationship ：

MySQL [(none)]>stop slave;
MySQL [(none)]>reset slave;
MySQL [(none)]>change master to master_host=' Standby machine IP',master_user='root',master_password=' password ';
MySQL [(none)]>start slave;

Standby machine IP Configure peer IP address ;
Restart after configuration mysql service

systemctl restart mysql

View active and standby status ：

MySQL [radius]> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: IP.IP.IP.IP     there ip The address should be opposite ip Address 
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000029
          Read_Master_Log_Pos: 22008
               Relay_Log_File: localhost-relay-bin.000003
                Relay_Log_Pos: 7945086
        Relay_Master_Log_File: mysql-bin.000028
             Slave_IO_Running: Yes			 	 Check these three items 
            Slave_SQL_Running: Yes				 Check these three items 
              Replicate_Do_DB: radius			 Check these three items 
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:

If all the states are the same as above , So at this time ,mysql The synchronization function has been configured successfully ;
At this time, it is better to use the host A Of radius The library creates a jacob_test surface , Standby machine B It can also be found on the ：

 host A:
MySQL [radius]> create table test(val int);
Query OK, 0 rows affected (0.13 sec)
 host B:
MySQL [radius]> show tables;
+------------------+
| Tables_in_radius |
+------------------+
| jacob_test       |
+------------------+
14 rows in set (0.00 sec)

Script configuration ： Create a script named ：mysqlha.sh Script for , Among them HA_STATUS Judgment is negligible

 Insert a code chip here [[email protected] mysql]# cat haMysql.sh #!/bin/bash - MY_CNF="./my.cnf" MYSQLD="\[mysqld\]" HA_STATUS=/usr/lib/eGW/.ha.status function mysql_ha_replicate_db() {
    
	echo "The function of replicate" >> /var/log/messages
	if [ `grep -c "$MYSQLD" $MY_CNF` -ne '0' ];then echo "The File Has mysqld section" >> /var/log/messages line=`cat ${
    MY_CNF} |grep -n "replicate-do-db" |grep -v "\#" |awk -F: '{
    print $1}' |sed -n if [ "X${
    line}" != "X" ]; then sed -i "${
    line}c replicate-do-db=radius" $MY_CNF
                        if [ $? -eq 0 ]; then
                                echo "$LINENO: set replicate-do-db=radius successfully" >> /var/log/message
                        else
                                echo "$LINENO: set replicate-do-db=radius failed" >> /var/log/messages
                        fi
                else
                        echo "Append modify" >> /var/log/messages
                	sed -i '/\[mysqld\]/a\'replicate-do-db=radius'' $MY_CNF
                	if [ $? -eq 0 ]; then
                        	echo "set replicate-do-db=radius successfully" >> /var/log/messages
                	else
                        	echo "set replicate-do-db=radius failed" >> /var/log/messages
                	fi
                fi
	else
		echo "The File don't have mysqld section,Append Configuration" >> /var/log/messages
		echo "[mysqld]" >> $MY_CNF
		echo "replicate-do-db=radius" >> $MY_CNF
	fi
}

function mysql_ha_server_id() {
    
	echo "The function of server_id" >> /var/log/messages
	local ha_status=$(cat $HA_STATUS)
	echo "The server status:$ha_status" >> /var/log/messages
        if [[ $ha_status == "MASTER" ]];then echo "local server is master!" >> /var/log/messages line=`cat ${
    MY_CNF} |grep -n "server-id" |grep -v "\#" |awk -F: '{
    print $1}' |sed -n 1p` if [ "X${
    line}" != "X" ]; then sed -i "${
    line}c server-id=1" $MY_CNF
			if [ $? -eq 0 ]; then
				echo "$LINENO: set maseter server-id=1 successfully" >> /var/log/messages
			else
				echo "$LINENO: set maseter server-id=1 failed" >> /var/log/messages
			fi
		else
			echo "Skip modify" >> /var/log/messages
		fi
        elif [[ $ha_status == "BACKUP" ]];then echo "local server is backup!" >> /var/log/messages line=`cat ${
    MY_CNF} |grep -n "server-id" |grep -v "\#" |awk -F: '{
    print $1}' |sed -n 1p` if [ "X${
    line}" != "X" ]; then sed -i "${
    line}c server-id=2" $MY_CNF
                        if [ $? -eq 0 ]; then echo "$LINENO: set backup server-id=2 successfully" >> /var/log/messages else echo "$LINENO: set backup server-id=2 failed" >> /var/log/messages fi else echo "Skip modify" >> /var/log/messages fi else echo "Independent deployment" >> /var/log/messages line=`cat ${
    MY_CNF} |grep -n "server-id" |grep -v "\#" |awk -F: '{
    print $1}' |sed -n 1p` if [ "X${
    line}" != "X" ]; then sed -i "${
    line}c server-id=1" $MY_CNF
                        if [ $? -ne 0 ]; then
                                echo "$LINENO: set Independent server-id=1 successfully" >> /var/log/messag
                        else
                                echo "$LINENO: set Independent server-id=1 failed" >> /var/log/messages
                        fi
                else
                        echo "Skip modify" >> /var/log/messages
                fi
            	exit 0
        fi
}

function mysql_ha_sql_command() {
    
	echo "The function of sql_command" >> /var/log/messages HA_CONF=/etc/eGW/ha.conf local ha_slave_ip=$(awk -F ' = ' '/^slaveip/{
    print $2}' $HA_CONF)
	mysql -uroot [email protected] -e "
	GRANT ALL PRIVILEGES ON *.* TO \"root3\"@\"%\" IDENTIFIED BY '[email protected]' WITH GRANT OPTION;
	flush privileges;
	stop slave;
	reset slave;
	change master to master_host='$ha_slave_ip',master_user='root',master_password='[email protected]';
	start slave;
	quit"
}

function mysql_ha() {
    
	echo "**********Execute HA mysql function**********" >> /var/log/messages
	mysql_ha_replicate_db
	mysql_ha_server_id
	mysql_ha_sql_command
	echo "************End HA mysql function************" >> /var/log/messages
}

mysql_ha