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[ec2_master].compute.amazonaws.com looks like the hostname for a public IP address. You should be using the private IP address of the EC2 machine, inside VPC. RDS instances may not have access to the VPC's DNS resolver, which would otherwise cause the public hostname to resolve to the private IP address for queries that originate from inside, if the VPC is ...


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Flush Logs is safe to do while replication is on, it only switches the current log file. The switching of log files is also done according to the max_binlog_size variable's value.


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A workaround would be to use preshared keys ( between all cluster ) and use the masterha_check_ssh with public key authentication.



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