CSV import examples


To free up rack space for other applications, some hosts have been moved from the Campus data centre to the newly acquired Firehouse data centre. Discovery and Reasoning have handled the IP address and subnet changes but the Host nodes are still linked to the wrong location. Here is the CSV file to process, called firehouse_move.csv:


We process the CSV file with the following command line:

$ tw_imp_csv --username=system --password=system --kind=Host firehouse_move.csv

The script reads the file called firehouse_move.csv line by line. It uses the first line to name the columns. The first column is called name, which does not begin with a # character so it is treated as an attribute name. The second column does begin with a # character so it is treated as a specification for some relationships.

No explicit key has been specified so the first (and in this case, only) attribute name is taken to be the key.

Now the script reads the second line. The first field, egon, is in the name column which was selected as the key earlier. So the script uses the search service to find a node of kind Host (from the --kind command line option) that has a name attribute equal to egon. It finds exactly one node matching that search. If it had not found that node, it would have been created. If it had found multiple nodes, an error would have been reported and processing would continue with the next line, NO nodes would have been updated.

Having found the node, it updates it using the other fields on the row. Were there any other attribute columns in the the file, the script would have used these to update the node before looking at the relationships.

The file has only one relationship column. The name is #ElementInLocation:Location:Location:Location.name. The script searches for a Location node with a name attribute equal Firehouse, this row's value for the column. Having found the Location node, the script creates a HostLocation relationship to it with the Host node playing the HostInLocation role and the Location playing the LocationOfHost role.

The script then processes the second and third data rows, updating the ray and peter nodes with the new location.

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