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galgalesh's questions

Martin Hope
Merlijn Sebrechts
Asked: 2018-07-26 04:01:12 +0800 CST
  • 6

When a process logs to systemd, its process name is recorded and displayed as identifier in the journalctl output.

$ systemd-cat echo "test"
$ journalctl -f
-- Logs begin at Sat 2018-02-24 12:13:24 CET. --
...
Jul 25 13:52:26 mycomputer echo[25098]: test

Filtering on that name, however, doesn't seem to work.

$ journalctl -f -t echo
-- Logs begin at Sat 2018-02-24 12:13:24 CET. --
$ journalctl -f -u echo
-- Logs begin at Sat 2018-02-24 12:13:24 CET. --

When I manually specify an identifier, the identifier is shown instead of the process name and filtering works.

$ systemd-cat -t myapp echo "test"
$ journalctl -f
-- Logs begin at Sat 2018-02-24 12:13:24 CET. --
Jul 25 13:56:08 mycomputer myapp[25213]: test
$ journalctl -f -t myapp
-- Logs begin at Sat 2018-02-24 12:13:24 CET. --
Jul 25 13:56:08 mycomputer myapp[25213]: test

How can I filter journalctl output on process name?

logging
Martin Hope
Merlijn Sebrechts
Asked: 2015-04-17 02:02:38 +0800 CST
  • 6

I want to check if there is a slaves databag. If there is one, and it contains data then I want to execute an action for every slave.

I have the following code:

slaves = data_bag('slaves')

if slaves.length > 0
   for slave in slaves
      ...xyz..
   end
end

This works, except when the databag doesn't exist yet. How can I check if the databag exists yet? Or am I doing this completely wrong?

chef
Martin Hope
Merlijn Sebrechts
Asked: 2015-04-16 02:08:25 +0800 CST
  • 2

My current understanding:

  • You can add a recipe to a client. A recipe can contain other recipes.
  • You can add a role to a client. A role can contain other roles and recipes.

Then what's the practical difference between a recipe and a role? Why would I want to make a role consisting of multiple recipes instead of just a recipe consisting of multiple recipes?

chef