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Common Reference

Host Availability Checks

Applies to: Tungsten Clustering for MySQL

The manager checks the availability of other hosts, for example to determine whether the host is still up, rather than just an individual service on that host. These checks must be able to be performed by one of the two available methods. Without these checks, it is possible for the availability of hosts to be falsely determined. These checks are performed using one of two protocols:

  • ping : The preferred, and default, method using the system ping (ICMP) command.
  • Uses the TCP/IP echo protocol on port 7. The port must be available on the source and destination host, not blocked by a system or network firewall.

The configuration of which service to use depends on the setting of the mgr-ping-method option during configuration. If no option is given, tpm will test ping first and then try TCP/IP Echo after. An error will be thrown if neither option works for all members of the dataservice.