I am pretty new to puppet and am trying to POC different scenarios I
would envision we would use this product for. One scenario I ran into
is setting a default kernel.sem value into /etc/sysctl.conf on linux
systems that can be overridden by a custom kernel.sem value for
systems that have specific applications installed that require a
modified value for application tuning.
So, as an example, I am setting the following as the default:
kernel.sem = 16384 262144 128 1023
So all systems should have the above value if they have no
applications installed that would modify that. On a system that would
have Oracle DB installed, the value needs to be updated to:
kernel.sem = 16384 262144 128 1024
So the last value 1023 becomes 1024.
So to define a system as being a DB system I created a fact that lists
the applications a system will be used for:
service => OracleDB, SCSP
I then have in my site.pp:
include system_defaults
if $service =~ /OracleDB/ {
include app_oracle
}
system_defaults has:
aug_conf::etc_sysctl_conf {
"kernel.sem": attr => "kernel.sem", value => "16384 262144 128
1023";
}
app_oracle has:
aug_conf::etc_sysctl_conf {
"kernel.sem": attr => "kernel.sem", value => "16384 262144 128
1024";
}
The define code is:
define etc_sysctl_conf ( $attr = "", $value = "" ) {
# guid of this entry
$key = "$attr"
$context = "/files/etc/sysctl.conf"
$path_list = "$attr"
$path_exact = "*[self::$attr=\"$value\"]"
augeas { "etc_sysctl_conf/$key":
context => "$context",
onlyif => "match $path_exact size==0",
changes => [
# insert/modify new node at the end of tree
"set $path_list \"$value\"",
],
}
}
So naturally this conflicts. What I am doing as a workaround is I
modified system_defaults to instead look like:
# If not OracleDB
if $service =~ /^((?!OracleDB).)*$/ {
aug_conf::etc_sysctl_conf {
"kernel.sem": attr => "kernel.sem", value => "16384 262144 128
1023";
}
}
This then makes things not conflict. There are some issues with the
solution I came up with though:
1) Seems awkward
2) I do not want to have to keep updating the list of applications
that will also modify kernel.sem in my system_defaults recipe as they
come about
I feel like I am not understanding something completely on how I
should be designing this for puppet. If anyone has any suggestions
please let me know. Also, if you require more information let me
know.
Thanks,
Jake
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