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2.2.3. MCollective
MCollective is used for any node host communications or interactions with either the broker host or other nodes. This can include gear placement or removal.
Use the following command to verify that a broker can communicate with all node hosts:
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All configured node hosts should be represented in the output. If you do not see a node host as expected, verify that the network and clock settings are configured correctly for that node host.
Note
If the
oo-mco ping command is not running successfully, it could be that openshift-origin-util-scl is not properly installed on your machine, or that oo-mco ping is missing. Install the openshift-origin-util-scl package in order to run the command.
Communication between broker and node hosts is logged in the following files:
/var/log/openshift/node/ruby193-mcollective.logon node hosts/var/log/openshift/broker/ruby193-mcollective-client.logon broker hosts
Communication that is dropped due to exceeding TTL is also logged in these files.
MCollective actions performed on the node can also log more details in
/var/log/openshift/node/platform.log and /var/log/openshift/node/platform-trace.log.
If necessary, you can determine on which node host an application is created using the
dig or host command, with the application's hostname.
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