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mdata-get - Online in the Cloud

Run mdata-get in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command mdata-get that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



mdata-get -- Fetch the value of a metadata key-value pair.


/usr/sbin/mdata-get keyname


The mdata-get command allows the user (or a script) to query the metadata for a guest
instance running in a SmartDataCenter (SDC) cloud. Metadata values are generally set
programmatically via CloudAPI, or during interactive provisioning via a Web Portal. They
may also be set from within the instance with the mdata-put command.

The value of the requested keyname will be printed to stdout. If the metadata service is
unavailable at the time of the request, this command will block waiting for it to become
available. Non-transient failures, such as the non-existence of the requested keyname,
will cause the program to exit with a non-zero status. Depending on the nature of the
error, some diagnostic output may be printed to stderr.


The following exit values are returned:

Successful completion.

The requested keyname was available, and its value was emitted to stdout.

Metadata value not found.

The requested keyname was not found in the metadata.

An error occurred.

An unexpected error condition occurred, which is believed to be a non-transient
condition. Retrying the request is not expected to resolve the error condition;
either a software bug or misconfiguration exists.

A usage error occurred.

Malformed arguments were passed to the program. Check the usage instructions to
ensure valid arguments are supplied.

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