linchpin journal¶
Upon completion of any provision (up) or teardown (destroy) task, there’s a record that is created ans stored in the RunDB. The linchpin journal
command provides data from the tasks, based upon the target. The data displayed to the screen shows the last three (3) tasks, along with some useful information.
$ linchpin journal dummy-new
Target: dummy-new
run_id action uhash rc
------------------------------------------
5 up 0658 0
4 destroy cf22 0
3 up cf22 0
The linchpin journal
can show more data as well. Fields (-f, --fields
) and
count (-c, --count
) are useful options.
$ linchpin journal dummy-new -f action,uhash,end -c 5
Target: dummy-new
run_id action uhash end
------------------------------------------
6 up cd00 12/15/2017 05:12:52 PM
5 up 0658 12/15/2017 05:10:52 PM
4 destroy cf22 12/15/2017 05:10:29 PM
3 up cf22 12/15/2017 05:10:17 PM
2 destroy 6d82 12/15/2017 05:10:06 PM
1 up 6d82 12/15/2017 05:09:52 PM
It is simple to see that the output now has five (5) records, each containing the run_id, action, uhash, and end date.
The data here can be used to perform idempotent (repetitive) tasks, like running the up action on run_id: 5 again.
$ linchpin up dummy-new -r 6
Action 'up' on Target 'dummy-new' is complete
Target Run ID uHash Exit Code
-------------------------------------------------
dummy-new 7 cd00 0
What might not be immediately obvious, is that the uhash on Run ID: 7 is identical to the run_id: 6 shown in the previous linchpin journal
output. Essentially, the same task was run again.
Note
If LinchPin is configured with the unique-hash feature, and the provider supports naming, resources can have unique names. These features are turned off by default.
The destroy action will automatically look up the last task with an up action and destroy it. If other resources are needed to be destroyed, a run_id should be passed to the task.
$ linchpin destroy dummy-new -r 5
Action 'destroy' on Target 'dummy-new' is complete
Target Run ID uHash Exit Code
-------------------------------------------------
dummy-new 8 0658 0