Before you get started on this, I think you should ask yourself this:
1) Do I want to maintain all of crontab (regardless of which machine gets what)
with CFEngine, or
2) Do I want to maintain a PART of crontab with CFEngine (and handle machine
differences manually on each machine)
Personally, I think 2 is a worse Idea, but if that's what you want, then using
a clear start/end marker and then maintaing promises in that region with "body
select_region" is how to do it.
However, I think having CFEngine maintain all of a file is often (but not
always) better, and here is how I maintain ntp.conf on two different networks
(the concept will match what you want to do - I am leaving out process
restarting, etc):
bundle agent servers
{
vars:
ipv4_10_0_1::
"ntp_conf" string => "
peer fit-pc.ibp.com.
server 0.us.pool.ntp.org maxpoll 6
server 1.us.pool.ntp.org maxpoll 6
server 2.us.pool.ntp.org maxpoll 6
";
ipv4_10_0_2::
"ntp_conf" string => "server fit-pc.ibp.com maxpoll 6 prefer";
files:
"/etc/ntp.conf"
create => "true",
perms => mo("644", "root"),
edit_line => ExpandMeFrom("$(sys.workdir)/clientfiles/ntp.conf",
"$(ntp_conf)"),
edit_defaults => empty;
}
bundle edit_line ExpandMeFrom(template, hs)
{
vars:
"host_specific" string => "$(hs)";
insert_lines:
# The variable $(host_specific) is in the $(template) file...
"$(template)"
insert_type => "file",
expand_scalars => "true";
}
Then in $(sys.workdir)/clientfiles/ntp.conf I have:
#
# Do not edit - this file maintained by cfengine from
$(bootstrap_g.policy_server)
#
server clock-1.cs.cmu.edu maxpoll 6
server clock-2.cs.cmu.edu maxpoll 6
$(host_specific)
pidfile /var/run/ntpd.pid
driftfile /etc/ntp.drift
Voila - CFEngine maintains the same file in different ways on different
machines, but with a core of matched functionality. You can even have multiple
host-specific variables if you wanna go crazy.
-Dan
On Sep 13, 2011, at 11:56 AM, [email protected] wrote:
> Forum: CFEngine Help
> Subject: Re: inserting lines into crontab
> Author: davidlee
> Link to topic: https://cfengine.com/forum/read.php?3,23442,23447#msg-23447
>
> Neil: Thanks for the reply, about defining a list in cfengine and appending
> that. There are two drawbacks for us, one technical, the other political:
>
> Technically: while that handles adding the lines in the first place, it
> doesn't address maintaining those same lines into the future (changing
> details, deleting old entries) unless one writes even more cfengine
> scripting. (Or have I missed something?)
>
> Politically: my team (to which I am still relatively new) is new to cfengine
> and are worried about the relative difficulty and obscurity of it compared to
> "well we simply used to copy files and it worked; why do we need this
> cfengine stuff". And although I personally like cfengine, I confess to
> sympathising with them, even agreeing with them. We're after a clear, simply
> stated promise of "please maintain the contents of a common source
> crontab-like file X into the target crontab file Y". (Note also the "clear,
> simply stated" there.)
>
> Mike: re your "/etc/cron.d" suggestion: that looks very interesting. (Smack
> my own forehead "why didn't I think of that"!) A promise that is clear and
> simple to express. Thanks.
>
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