To solve the problem of single point Mysql database, MySQL database to achieve two mutual backup, bi-directional replication. When a problem occurs Master, will continue to work to switch to Master Slave.
Environment Description
System version: CentOS Linux release 7.6.1810 (Core)
MySQL version: mysql Ver 14.14 Distrib 5.7.27
keepalived版本：Keepalived v1.2.13
No. IP server use
1 192.168.158.10 Master
2 192.168.158.20 Slave
3 192.168.158.30 VIP
A, MySQL mutual master-slave configuration
1.> Two same version MySQL database.
2.> NTP clock synchronization standby machine
3> Duplex trust authentication densely arranged ssh Free
4> configuration database (Master and Slave Configuration Configuration server-id is not consistent , the other can be the same)
4.1> modify configuration files on the master host MySQL database, and then restart MySQL
#vim / ECT / the my.cnf [mysqld] log -bin = MySQL- bin Server -id = 100 expire_logs_days = 10 DATADIR = / var / lib / MySQL Socket = / var / lib / MySQL / mysql.sock symbolic -links = 0 log -error = / var / log / mysqld.log pid -file = / var / RUN / mysqld / mysqld.pid validate_password = OFF # turn off password security policy default_password_lifetime = 0 # set password not expire log_bin=/var/log/mysql/mysql-bin
4.2> modify the configuration file of the Slave MySQL database host, and then restart MySQL
#vim /ect/my.cnf [mysqld] log-bin=mysql-bin server-id=101 expire_logs_days = 10 datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock symbolic-links=0 log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid validate_password=off default_password_lifetime=0 log_bin=/var/log/mysql/mysql-bin
5.> Start MySQL service
# systemctl start mysqld
6.> relevant state to Master host, for example, as follows
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 154 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
7.> Create a account setup and synchronization
7.1>, respectively, in the implementation of Master and Slave library library, create a copy of data synchronization account.
mysql> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO replication@'%' IDENTIFIED BY 'replication'; mysql> flush privileges;
7.2> 7.2> Master on the host, perform synchronization operations (Note master_host each point standby machine parameter), as follows:
mysql> change master to master_host='192.168.158.20',master_port=3306,master_user='replication',master_password='replication',master_log_file='mysql-bin.000001',master_log_pos=154; mysql> start slave;
7.3> Slave on the host, perform synchronization operations (Note master_host each point standby machine parameter), as follows:
mysql> change master to master_host='192.168.158.10',master_port=3306,master_user='replication',master_password='replication',master_log_file='mysql-bin.000001',master_log_pos=154; mysql> start slave;
7.4> on Master, Slave host, query synchronization status "show slave status \ G", check the results Slave_IO_Running: Yes and Slave_SQL_Running: Yes, otherwise there is an exception.
8.> Cipher text commands access (two hosts are configured)
when using Mysql database such as mysql or mysqldump related commands, you need to enter a password on the command-line interface, when using a script, enter a password in the script is clearly not safe, so You may be provided Mysql ciphertext file.
# mysql_config_editor set --login-path=local --user=root --port=3306 --password # mysql_config_editor print --all
9.> Create a toggle script
Switching script planning, as this switch is mysql, mysql therefore create a directory in the directory, all switching scripts into the / home / mysql directory, this time related to the script as follows:
Enter / home / mysql directory, the following documents:
Logs // store the log file directory
mybackup.sh // empty slave configuration, remote log file and retrieve Pos, and turn sync
mycheck.sh // check mysql running, if run properly, quit. If the run does not call normal pkill keepalived
mymaster.sh // first determine whether the synchronous copy execution is completed, and if not completed execution wait 1 minute, stopping the synchronization (stop slave;), and switching logs after recording and pos
.mysqlenv // script file runtime environment
mystop.sh // set parameters to ensure that data is not lost, the final check to see if there is a write operation, quit last minute
After syncposfile // every time you switch, Master File last value and Position values.
10. Environment File
10.1> Master host environment file
[MySQL the root @ localhost] # Vim .mysqlenv MYSQL Based = / usr / bin / MySQL MYSQL_CMD = " --login local-path = " the IP address of the remote host # REMOTE_IP = 192.168 . 158.20 Export MySQL = " $ $ MYSQL Based MYSQL_CMD "
10.2> Slave host environment file
[MySQL the root @ localhost] # Vim .mysqlenv MYSQL Based = / usr / bin / MySQL MYSQL_CMD = " --login local-path = " the IP address of the remote host # REMOTE_IP = 192.168 . 158.10 Export MySQL = " $ $ MYSQL Based MYSQL_CMD "
11.> Check Script Service
11.1> mycheck.sh
[root@localhost mysql]# vim mycheck.sh #!/bin/sh ################################################## #File Name : mycheck.sh #Description: mysql is working MYSQL_OK is 1 # mysql is down MYSQL_OK is 0 ################################################## BASEPATH=/home/mysql LOGSPATH=$BASEPATH/logs source $BASEPATH/.mysqlenv CHECK_TIME=3 MYSQL_OK=1 ################################################################## function check_mysql_helth (){ $mysql -e "show status;" >/dev/null 2>&1 if [ $? == 0 ] then MYSQL_OK=1 else MYSQL_OK=0 #systemctl status keepalived fi return $MYSQL_OK } #check_mysql_helth while [ $CHECK_TIME -ne 0 ] #不等于 do let "CHECK_TIME -= 1" check_mysql_helth if [ $MYSQL_OK = 1 ] ; then CHECK_TIME=0 echo "$(date "+%Y-%m-%d %H:%M:%S") The scripts mycheck.sh is running ..." >> $LOGSPATH/mysql_switch.log exit 0 fi if [ $MYSQL_OK -eq 0 ] && [ $CHECK_TIME -eq 0 ] #等于 then systemctl stop keepalived echo "$(date "+%Y-%m-%d %H:%M:%S") The mycheck.sh, mysql is down, after switch..." >> $LOGSPATH/mysql_switch.log exit 1 fi sleep 1 done [root@localhost mysql]#
11.2> switch script
[root@localhost mysql]# vim mymaster.sh #!/bin/sh ################################################## #File Name : mymaster.sh #Description: First determine whether synchronous # replication is performed, and if no # execution is completed, wait for 1 # minutes. Log logs and POS after # switching, and record files synchronously. ################################################## BASEPATH=/home/mysql LOGSPATH=$BASEPATH/logs source $BASEPATH/.mysqlenv $mysql -e "show slave status\G" > $LOGSPATH/mysqlslave.states Master_Log_File=`cat $LOGSPATH/mysqlslave.states | grep -w Master_Log_File | awk -F": " '{print $2}'` Relay_Master_Log_File=`cat $LOGSPATH/mysqlslave.states | grep -w Relay_Master_Log_File | awk -F": " '{print $2}'` Read_Master_Log_Pos=`cat $LOGSPATH/mysqlslave.states | grep -w Read_Master_Log_Pos | awk -F": " '{print $2}'` Exec_Master_Log_Pos=`cat $LOGSPATH/mysqlslave.states | grep -w Exec_Master_Log_Pos | awk -F": " '{print $2}'` i=1 while true do if [ $Master_Log_File = $Relay_Master_Log_File ] && [ $Read_Master_Log_Pos -eq $Exec_Master_Log_Pos ];then echo "$(date "+%Y-%m-%d %H:%M:%S") The mymaster.sh, slave sync ok... " >> $LOGSPATH/mysql_switch.log break else sleep 1 if [ $i -gt 60 ];then break fi continue let i++ fi done $mysql -e "stop slave;" $mysql -e "set global innodb_support_xa=0;" $mysql -e "set global sync_binlog=0;" $mysql -e "set global innodb_flush_log_at_trx_commit=0;" $mysql -e "flush logs;GRANT ALL PRIVILEGES ON *.* TO 'replication'@'%' IDENTIFIED BY 'replication';flush privileges;" $mysql -e "show master status;" > $LOGSPATH/master_status_$(date "+%y%m%d-%H%M").txt # sync pos file /usr/bin/scp $LOGSPATH/master_status_$(date "+%y%m%d-%H%M").txt root@$REMOTE_IP:$BASEPATH/syncposfile/backup_master.status echo "$(date "+%Y-%m-%d %H:%M:%S") The mymaster.sh, Sync pos file sucess." >> $LOGSPATH/mysql_switch.log [root@localhost mysql]#
11.3> cut back script
[root@localhost mysql]# vim mybackup.sh #!/bin/sh ################################################## #File Name : mybackup.sh #Description: Empty the slave configuration, retrieve # the remote log file and Pos, and open # the synchronization ################################################## BASEPATH=/home/mysql LOGSPATH=$BASEPATH/logs source $BASEPATH/.mysqlenv $mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'replication'@'%' IDENTIFIED BY 'replication';flush privileges;" $mysql -e "set global innodb_support_xa=0;" $mysql -e "set global sync_binlog=0;" $mysql -e "set global innodb_flush_log_at_trx_commit=0;" $mysql -e "flush logs;" $mysql -e "reset slave all;" if [ -f $BASEPATH/syncposfile/backup_master.status ];then New_ReM_File=`cat $BASEPATH/syncposfile/backup_master.status | grep -v File |awk '{print $1}'` New_ReM_Position=`cat $BASEPATH/syncposfile/backup_master.status | grep -v File |awk '{print $2}'` echo "$(date "+%Y-%m-%d %H:%M:%S") This mybackup.sh, New_ReM_File:$New_ReM_File,New_ReM_Position:$New_ReM_Position" >> $LOGSPATH/mysql_switch.log $mysql -e "change master to master_host='$REMOTE_IP',master_port=3306,master_user='replication',master_password='replication',master_log_file='$New_ReM_File',master_log_pos=$New_ReM_Position;" $mysql -e "start slave;" $mysql -e "show slave status\G;" > $LOGSPATH/slave_status_$(date "+%y%m%d-%H%M").txt cat $LOGSPATH/slave_status_$(date "+%y%m%d-%H%M").txt >> $LOGSPATH/mysql_switch.log rm -f $BASEPATH/syncposfile/backup_master.status else echo "$(date "+%Y-%m-%d %H:%M:%S") The scripts mybackup.sh running error..." >> $LOGSPATH/mysql_switch.log fi [root@localhost mysql]#
11.4> Stop Script
[root@localhost mysql]# vim mystop.sh #!/bin/sh ################################################## #File Name : mystop.sh #Description: Set parameters to ensure that the data # is not lost, and finally check to see # if there are still write operations, # the last 1 minutes to exit ################################################## BASEPATH=/home/mysql LOGSPATH=$BASEPATH/logs source $BASEPATH/.mysqlenv $mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'replication'@'%' IDENTIFIED BY 'replication';flush privileges;" $mysql -e "set global innodb_support_xa=1;" $mysql -e "set global sync_binlog=1;" $mysql -e "set global innodb_flush_log_at_trx_commit=1;" $mysql -e "show master status\G" > $LOGSPATH/mysqlmaster0.states M_File1=`cat $LOGSPATH/mysqlmaster0.states | awk -F': ' '/File/{print $2}'` M_Position1=`cat $LOGSPATH/mysqlmaster0.states | awk -F': ' '/Position/{print $2}'` sleep 2 $mysql -e "show master status\G" > $LOGSPATH/mysqlmaster1.states M_File2=`cat $LOGSPATH/mysqlmaster1.states | awk -F': ' '/File/{print $2}'` M_Position2=`cat $LOGSPATH/mysqlmaster1.states | awk -F': ' '/Position/{print $2}'` i=1 while true do if [ $M_File1 = $M_File2 ] && [ $M_Position1 -eq $M_Position2 ];then echo "$(date "+%Y-%m-%d %H:%M:%S") The mystop.sh, master sync ok.." >> $LOGSPATH/mysql_switch.log exit 0 else sleep 1 if [$i -gt 60 ];then break fi continue let i++ fi done echo "$(date "+%Y-%m-%d %H:%M:%S") The mystop.sh, master sync exceed one minutes..." >> $LOGSPATH/mysql_switch.log [root@localhost mysql]#
# mysql_config_editor set --login-path=local --user=root --port=3306 --password# mysql_config_editor print --all