linchpin journal¶
Upon completion of any provision (up) or teardown (destroy) task, there’s a record that is created and stored in the RunDB. The linchpin journal command displays data about these tasks.
$ linchpin journal --help
Usage: linchpin journal [OPTIONS] TARGETS
Display information stored in Run Database
view: How the journal is displayed
'target': show results of transactions on listed targets
(or all if omitted)
'tx': show results of each transaction, with results
of associated targets used
(Default: target)
count: Number of records to show per target
targets: Display data for the listed target(s). If omitted, the latest
records for any/all targets in the RunDB will be displayed.
fields: Comma separated list of fields to show in the display.
(Default: action, uhash, rc)
(available fields are: uhash, rc, start, end, action)
Options:
--view VIEW Type of view display (default: target)
-c, --count COUNT (up to) number of records to return (default: 3)
-f, --fields FIELDS List the fields to display
-h, --help Show this message and exit.
There are two specific ways to view the data using the journal, by ‘target’ and ‘transactions (tx)’.
Target¶
The default view, ‘target’, is displayed using the target. The data displayed to the screen shows the last three (3) tasks per target, along with some useful information.
$ linchpin journal --view=target dummy-new
Target: dummy-new
run_id action uhash rc
------------------------------------------
5 up 0658 0
4 destroy cf22 0
3 up cf22 0
Note
The ‘target’ view is the default, making the –view optional.
The target view 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
Transactions¶
The transaction view, provides data based upon each transaction.
$ linchpin journal --view tx --count 1
ID: 130 Action: up
Target Run ID uHash Exit Code
-------------------------------------------------
dummy-new 279 920c 0
libvirt 121 ef96 0
=================================================
In the future, the transaction view will also provide output for these items.