Setup a slave DB for a scratch installed ViciDial

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How to – Setup a slave DB for a scratch installed ViciDial. This Article will go over how to setup a slave database server for your ViciDial cluster when using a scratch installed server bunch. For this particular example I have used Alma Linux 8.5 which installs Mysql 10.3.28, if you followed my scratch instructions. This process was a pain in the arse, but after much trial and error I was able to get it done and here is how I did it:

Step 1 – Edit the MySQL config file

Add these lines to /etc/my.cnf below [mysqld] on both the master and slave database:

datadir = /srv/mysql/data
server-id       = 1
slave-skip-errors = 1032,1690,1062

Step 2 – Create the slave user on both servers

Go into MySQL and create the slave user and do this on both servers

CREATE USER 'slave'@'localhost' IDENTIFIED BY 'slave1234';
CREATE USER 'slave'@'%' IDENTIFIED BY 'slave1234';
GRANT SELECT, CREATE, INSERT, UPDATE, DELETE, ALTER, DROP, INDEX on asterisk.* TO [email protected]'%' IDENTIFIED BY 'slave1234';
GRANT SELECT, CREATE, INSERT, UPDATE, DELETE, ALTER, DROP, INDEX on asterisk.* TO [email protected] IDENTIFIED BY 'slave1234';
grant replication slave on . to [email protected]'%' identified by 'slave1234';
grant replication slave on . to [email protected]'localhost' identified by 'slave1234';
flush privileges;

Create slave user on both the master and slave DB

Step 3 – Change some setting on the slave DB

Now we need to change some of the settings for the slave DB and add a couple more lines. Change the server-id to 2 instead of 1 in /etc/my.cnf and add the read_only=1 and report-host=whatever the slave DB host is

# read only yes
# define own hostname

Step 4 – Restart the MySQL services on both servers

Run the following command on both servers:

service mysql restart

Step 5 – Create the MySQL dump to send over to the slave DB from the master

We need to create the MySQL dump and send it over to the slave using the scp command like so:

mkdir /home/mariadb_backup
mariabackup --backup --target-dir /home/mariadb_backup -u root
Setup a slave DB for a scratch installed ViciDial

Create MySQL dump file

Once thats done go ahead and zip up the files and send the file over by typing the following:

cd /home/mariadb_backup
zip -r *

Why we are here, lets lock the MySQL tables on the master:


Step 6 – Connect to Slave DB and extract the files and load it into the slave

ssh into your slave db server and change directory to /root then create the folder and extract the files like so:

cd /root
mkdir mariadb_backup
mv mariadb_backup/
cd mariadb_backup/
systemctl stop mariadb
rm -rf /var/lib/mysql/*
Setup a slave DB for a scratch installed ViciDial

Now run the following commands that are BOLD to import the MySQL dump and set its position to match that of the master.

# run prepare task before restore task (OK if [completed OK])
[[email protected] ~]# mariabackup --prepare --target-dir /root/mariadb_backup
mariabackup based on MariaDB server 10.3.28-MariaDB Linux (x86_64)
mariabackup: cd to /root/mariadb_backup/
2019-11-29 19:38:20 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=1630833
Last binlog file , position 0
191129 19:38:21 completed OK!

# run restore
[[email protected] ~]# mariabackup --copy-back --target-dir /root/mariadb_backup
mariabackup based on MariaDB server 10.3.28-MariaDB Linux (x86_64)
191129 19:39:21 [01] Copying ibdata1 to /var/lib/mysql/ibdata1
191129 19:39:21 [01]        ...done
191129 19:39:21 [01] Copying ./xtrabackup_binlog_pos_innodb to /var/lib/mysql/xtrabackup_binlog_pos_innodb
191129 19:39:21 [01]        ...done
191129 19:39:21 completed OK!

[[email protected] ~]# chown -R mysql. /var/lib/mysql
[[email protected] ~]# systemctl start mariadb
# confirm [File] and [Position] value of master log
[[email protected] ~]# cat /root/mariadb_backup/xtrabackup_binlog_info
mysql-bin.000001        642     0-101-2

# set replication
[[email protected] ~]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 10.3.28-MariaDB-log MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> change master to 
    -> master_host='',             # Master Host IP address
    -> master_user='repl_user',             # replication user
    -> master_password='password',          # replication user password
    -> master_log_file='mysql-bin.000001',  # [File] value confirmed above
    -> master_log_pos=642;              # [Position] value confirmed above
Query OK, 0 rows affected (0.58 sec)

# start replication
MariaDB [(none)]> start slave; 
Query OK, 0 rows affected (0.00 sec)

# show status
MariaDB [(none)]> show slave status\G 
*************************** 1. row ***************************
                Slave_IO_State: Waiting for master to send event
                   Master_User: repl_user
                   Master_Port: 3306
                 Connect_Retry: 60
               Master_Log_File: mysql-bin.000001
           Read_Master_Log_Pos: 642
                Relay_Log_File: mariadb-relay-bin.000002
                 Relay_Log_Pos: 555
         Relay_Master_Log_File: mysql-bin.000001
              Slave_IO_Running: Yes
             Slave_SQL_Running: Yes
                    Last_Errno: 0
                  Skip_Counter: 0
           Exec_Master_Log_Pos: 642
               Relay_Log_Space: 866
               Until_Condition: None
                 Until_Log_Pos: 0
            Master_SSL_Allowed: No
         Seconds_Behind_Master: 0
 Master_SSL_Verify_Server_Cert: No
                 Last_IO_Errno: 0
                Last_SQL_Errno: 0
              Master_Server_Id: 101
                    Using_Gtid: No
                 Parallel_Mode: conservative
                     SQL_Delay: 0
           SQL_Remaining_Delay: NULL
       Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
              Slave_DDL_Groups: 0
Slave_Non_Transactional_Groups: 0
    Slave_Transactional_Groups: 0
1 row in set (0.000 sec)

Step 7 – Unlock the Master DB

Now go back into the master DB and unlock the tables:

unlock tables;

Step 8 – Set the Slave DB in ViciDIal

Now you can set the slave server info in ViciDial by going into the admin GUI and going into system settings. Set the slave DB server IP and choose which reports you want to display from it.

Well, this has been quite the nightmare to get it done and hopefully I can save some of you some time with this article.

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