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Re: Mysql 5.7 replication (A -> B -> C) not working
Posted by: gowthamakanthan gopal
Date: June 28, 2021 03:08PM

Thanks a lot for the reply. I've followed the article double verified the config files. Kindly check the details below.

On Server C(Master):

#/etc/my.cnf
[mysqld]
key_buffer_size=512M
server-id=2
report-host=10.13.123.40
user=mysql
read_only=0
log-slave-updates=1
log_bin=mysql-bin
relay-log=mysql-relay-bin
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

mysql> show slave hosts;
+-----------+--------------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID |
+-----------+--------------+------+-----------+--------------------------------------+
| 102 | 10.13.123.41 | 3306 | 2 | 1fa9a760-d853-11eb-ab2e-005056967d87 |
+-----------+--------------+------+-----------+--------------------------------------+
1 row in set (0.00 sec)

mysql> SHOW variables WHERE Variable_Name IN ("server_id", "log_bin", "relay_log", "log_slave_updates", "read_only");
+-------------------+-----------------+
| Variable_name | Value |
+-------------------+-----------------+
| log_bin | ON |
| log_slave_updates | ON |
| read_only | OFF |
| relay_log | mysql-relay-bin |
| server_id | 2 |
+-------------------+-----------------+
5 rows in set (0.00 sec)

mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000002
Position: 154
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)

mysql>


=============================

In Slave (Server D):
mysql> SHOW variables WHERE Variable_Name IN ("server_id", "log_bin", "relay_log", "log_slave_updates", "read_only");
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| log_bin | ON |
| log_slave_updates | OFF |
| read_only | ON |
| relay_log | |
| server_id | 102 |
+-------------------+-------+
5 rows in set (0.00 sec)

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.13.123.40
Master_User: replica
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 154
Relay_Log_File: lon-cms-prod-v2-relay-bin.000003
Relay_Log_Pos: 367
Relay_Master_Log_File: mysql-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: 154
Relay_Log_Space: 797
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: 2
Master_UUID: bfd4b293-d3ec-11eb-a834-00505696d4ab
Master_Info_File: /var/lib/mysql/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)

mysql> show tables;
Empty set (0.00 sec)

mysql>

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Re: Mysql 5.7 replication (A -> B -> C) not working
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June 28, 2021 03:08PM


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