Forum: CFEngine Help
Subject: controlling redhat-style startup services via chkconfig
Author: matt_garman
Link to topic: https://cfengine.com/forum/read.php?3,24162,24162#msg-24162
Hi,
I'm trying to create a promise that makes sure startup services are enabled on
CentOS (RHEL) servers via the "chkconfig" program. In particular, I'm looking
at neilhwatson's example and this similar question from ErikOonk.
Here is what I have in a file called "util.cf":
bundle agent rh_chkconfig_status(s) {
classes:
"${s}_enabled" expression =>
returnszero("/sbin/chkconfig ${s}", "noshell");
reports:
all::
"service ${s} is enabled",
ifvarclass => "${s}_enabled";
"service ${s} is NOT enabled",
ifvarclass => "!${s}_enabled";
}
And here is "check_service_enabled.cf":
body common control
{
bundlesequence => { "check_service_enabled" };
inputs => { "util.cf" };
}
bundle agent check_service_enabled
{
methods:
redhat|centos|SuSE::
"any" usebundle => rh_chkconfig_status("ntpd");
}
If I try to run this via "cf-agent -K -f ./check_service_enabled.cf", it
outputs nothing. Running it verbosely, for the reports promises, it says:
cf3> Skipping whole next promise (service ntpd is enabled), as context all is
not relevant
cf3> (snip)
cf3> Skipping whole next promise (service ntpd is NOT enabled), as context all
is not relevant
As far as I can tell, this is copied verbatim from neilhwatson's example (to
which I linked above). However, I can fix this by making a one-line change to
"util.cf":
bundle agent rh_chkconfig_status(s) {
classes:
"${s}_enabled" expression =>
returnszero("/sbin/chkconfig ${s}", "noshell");
reports:
redhat|centos|SuSE:: # changed this from all::
"service ${s} is enabled",
ifvarclass => "${s}_enabled";
"service ${s} is NOT enabled",
ifvarclass => "!${s}_enabled";
}
And now it works! When I run it, I get "R: service ntpd is enabled", as
expected. I don't understand why this is.
Question 2, which is related. Now I want to get a bit fancier: ntpd isn't the
only service I care about, so I want to use an slist for some implicit
iteration on this rh_chkconfig_status() bundle.
So "util.cf" stays the same, and I introduce this file, "classes.cf":
bundle common g
{
classes:
"need_ntp" expression => "any";
}
At some point, the "need_ntp" expression will be more sophisticated, but trying
to keep it as simple as possible for now. And then I change
"check_service_enabled.cf" to look like this:
body common control
{
bundlesequence => { "check_service_enabled" };
inputs => { "classes.cf", "util.cf" };
}
bundle agent check_service_enabled
{
vars:
need_ntp:: "service" slist => { "ntpd", "named" };
!need_ntp:: "service" slist => { "named" };
methods:
redhat|centos|SuSE::
"any" usebundle => rh_chkconfig_status(${service});
reports:
need_ntp:: "need NTP";
!need_ntp:: "do NOT need NTP";
}
Output is exactly this:
R: service named is enabled
R: need NTP
Notice anything? Even though we are part of the "need_ntp" class, it doesn't
report "service ntpd is enabled" like I expect. In fact, it looks like it's
using the slist with only "named" defined.
What am I missing?
Thanks,
Matt
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