Forum: Cfengine Help
Subject: Re: How to extract values (not keys) from an array to slist?
Author: msvob...@linkedin.com
Link to topic: https://cfengine.com/forum/read.php?3,21174,21199#msg-21199
Hey Diego
Here's what I'm working on. Hopefully, this either helps someone else trying
to solve the same problem, or you could point me in a better direction.
5 bundle agent rhel6_services
6 {
7 vars:
8 redhat_6::
9 # running_service is what the cmd output is in the
output of ps -ef in the process table.
10 # services we want running.
11 "running_service" slist =>
{ "ntpd", "mdadm", };
12
13
14 # services we dont want running. this is what we would
find in the output of ps -ef in the process table.
15 "stop_service" slist =>
{ "/usr/sbin/atd", "/usr/sbin/abrtd",};
16
17 # running_service_name is what the service is refered
to via the chkconfig or service command.
18 # every entry from running_service needs to have an
entry here. Its what gets referenced in chkconfig and service cmds.
19 "running_service_name" string =>
"ntpd";
20 "running_service_name" string =>
"mdmonitor";
21
22
23 # stopped_service_name is what the service is refered
to via the chkconfig or service command.
24 # every entry from stop_service needs to have an entry
here. Its what gets referenced in chkconfig and service cmnds.
25 "stopped_service_name" string => "atd";
26 "stopped_service_name" string => "abrtd";
27
28
29
30 processes:
31 # Only raise these classes if we are on a RHEL6 host. Once the
class is defined, RHEL6 is an
32 # assumed prerequesite. the running_service variable is
expanded from an slist to an individual entry, and then
33 # that individual entry is actually checked in the process
table. If its not found,
34 # we raise the "restart" class. This class gets executed upon
in the commands section.
35 redhat_6::
36 "$(running_service)"
37 restart_class =>
canonify("$(running_service)_start");
38
39 # If we found a service in the process table that we dont want
running, then execute its stop function using service..
40 redhat_6::
41 "$(stop_service)"
42 process_stop => "/sbin/service
$(stopped_service_name[$(stop_service)]) stop";
43
44 commands:
45 ################################# START SERVICES
###############################################
46 redhat_6::
47 "/sbin/service
$(running_service_name[$(running_service)]) start"
48 ifvarclass =>
canonify("$(running_service)_start");
49
50 # Since we had to start this process, make sure the symlinks
are in place via chkconfig.
51 #redhat_6::
52 #"/sbin/chkconfig
$(running_service_name[$(running_service)]) on"
53 #ifvarclass =>
canonify("$(running_service)_start");
54 ################################# START SERVICES
###############################################
55
56 methods:
57 redhat_6::
58 "any" usebundle =>
rh_chkconfig_on($(rhel6_services.running_service_name));
59
60 reports:
61 redhat_6::
62 "cf3: RHEL6 service
$(running_service_name[$(running_service)]) was restarted on $(sys.host)"
63 ifvarclass =>
canonify("$(running_service)_start");
64
65 redhat_6::
66 "cf3: RHEL6 service
$(stopped_service_name[$(stop_service)]) was disabled on $(sys.host)"
67 ifvarclass =>
canonify("$(stop_service)_stop");
68 }
69 ###################################################
70 bundle agent rh_chkconfig_on(service)
71 {
72 vars:
73 "index" slist => getindices("service");
74
75 reports:
76 redhat_6::
77 "Service is ${index}";
78
79 }
So the problem I'm running into here, is creating the relationship between the
process name in the process table from the output of ps -ef, and its service
name...
The bulk of code above just handles starting / stopping the processes. Going
from an example that Neil provided:
vars:
unxxhd01::
"services" slist => {
"xfs",
"smb",
"autofs",
"xinetd"
methods:
redhat|SuSE::
"any" usebundle => rh_chkconfig_status(${services});
}
bundle agent rh_chkconfig_status(s){
# Report whether service is enabled using chkconfig
classes:
"${s}_enabled" expression =>
returnszero("/sbin/chkconfig ${s}","noshell");
reports:
all::
"${g.pf} Service ${s} is enabled",
ifvarclass => "${s}_enabled";
"${g.pk} Service ${s} is not enabled",
ifvarclass => "!${s}_enabled";
}
So, this works for chkconfig, but there isn't a relationship between the
process name, and what its service / chkconfig name is called. By creating the
array, I lock those two values together.
Unfortunately, to extract the values of the things I need to chkconfig on /
off, I need the getindicies() equiv that Mark has just submitted to the SVN
trunk.
The methods: part, and rh_chkconfig_on promise have been modified, as I started
trying other solutions. I tried to pass the array in the method call, but I
think i'm going to give up on that approach.
I think as a work around, I'll have the service name act as the key, and the
process table name be the value. That will allow me to work with the process:
part of the policy, and then be able to feed an slist to the method using
getindicies()
And thanks again Mark for the new function. =)
Mike
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