Re: [Puppet Users] using memorysize fact in manifests
Andreas Kuntzagk wrote:
> I want some config depending on memorysize.
>
> What I tried was
>if ($memorysize >= 256 * 1024*1024) {
> ...
>}
>
> But this fails because $memorysize is a string (and contains a "G")
> and can't be compared to an int.
>
> Are all facts strings? How do I work with numbers?
Typical problem. Not to mention that you happen to have "G" but that
could very easily be "M". Here's my workaround for that, which I use
for calculations to then set some sysctl.conf values accordingly :
# This is ugly, but very useful to get a standard kiB total RAM
# to base further calculations upon. Note that we get a string
$mem = inline_template("<%
mem,unit = scope.lookupvar('::memorysize').split
mem = mem.to_f
# Normalize mem to KiB
case unit
when nil: mem *= (1<<0)
when 'kB': mem *= (1<<10)
when 'MB': mem *= (1<<20)
when 'GB': mem *= (1<<30)
when 'TB': mem *= (1<<40)
end
%><%= mem.to_i %>")
Here's an example of how I then use it :
# kernel.shmmax
if $shmmax {
$shmmax_final = $shmmax
} else {
if $oracle {
# For non-shm half the RAM for <= 4G, 2G otherwise
if $mem <= 4294967296 {
$shmmax_final = $mem / 2
} else {
$shmmax_final = $mem - 2147483648
}
} else {
$shmmax_final = $mem
}
}
HTH,
Matthias
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Re: [Puppet Users] using memorysize fact in manifests
On 30-06-11 11:20, Matthias Saou wrote:
> Andreas Kuntzagk wrote:
>
>> I want some config depending on memorysize.
>>
>> What I tried was
>>if ($memorysize >= 256 * 1024*1024) {
>> ...
>>}
>>
>> But this fails because $memorysize is a string (and contains a "G")
>> and can't be compared to an int.
>>
>> Are all facts strings? How do I work with numbers?
>
> Typical problem. Not to mention that you happen to have "G" but that
> could very easily be "M". Here's my workaround for that, which I use
> for calculations to then set some sysctl.conf values accordingly :
>
> # This is ugly, but very useful to get a standard kiB total RAM
> # to base further calculations upon. Note that we get a string
> $mem = inline_template("<%
> mem,unit = scope.lookupvar('::memorysize').split
> mem = mem.to_f
> # Normalize mem to KiB
> case unit
> when nil: mem *= (1<<0)
> when 'kB': mem *= (1<<10)
> when 'MB': mem *= (1<<20)
> when 'GB': mem *= (1<<30)
> when 'TB': mem *= (1<<40)
> end
> %><%= mem.to_i %>")
I use a custom fact, that returns the amount of system memory in
megabytes. This is, however, Linux-only, since it uses /proc/meminfo:
$ cat modules/common/lib/facter/memorysize_mb.rb
require 'facter'
Facter.add("memorysize_mb") do
confine :kernel => :Linux
ram = 0
# Steal linux's meminfo
File.open( "/proc/meminfo" , 'r' ) do |f|
f.grep( /^MemTotal:/ ) { |mem|
ram = mem.split( / +/ )[1].to_i / 1024
}
end
setcode do
ram
end
end
> Here's an example of how I then use it :
>
> # kernel.shmmax
> if $shmmax {
> $shmmax_final = $shmmax
> } else {
> if $oracle {
> # For non-shm half the RAM for <= 4G, 2G otherwise
> if $mem <= 4294967296 {
> $shmmax_final = $mem / 2
> } else {
> $shmmax_final = $mem - 2147483648
> }
> } else {
> $shmmax_final = $mem
> }
> }
Best regards,
Martijn Grendelman
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Re: [Puppet Users] using memorysize fact in manifests
Well that's odd, I was looking at the exact same issue this morning for
sysctl.conf / oracle stuff.
But why are people writing new facts?? Why not just take a copy of the
original function and simply not run the function that normalizes the
number? It seems very odd to make a more limited version of the function
when it's already there.
Is it not possible to copy the code directly from utils/memory.rb in
facter?
Chris
On 30 June 2011 13:00, Martijn Grendelman wrote:
> On 30-06-11 11:20, Matthias Saou wrote:
> > Andreas Kuntzagk wrote:
> >
> >> I want some config depending on memorysize.
> >>
> >> What I tried was
> >>if ($memorysize >= 256 * 1024*1024) {
> >> ...
> >>}
> >>
> >> But this fails because $memorysize is a string (and contains a "G")
> >> and can't be compared to an int.
> >>
> >> Are all facts strings? How do I work with numbers?
> >
> > Typical problem. Not to mention that you happen to have "G" but that
> > could very easily be "M". Here's my workaround for that, which I use
> > for calculations to then set some sysctl.conf values accordingly :
> >
> > # This is ugly, but very useful to get a standard kiB total RAM
> > # to base further calculations upon. Note that we get a string
> > $mem = inline_template("<%
> > mem,unit = scope.lookupvar('::memorysize').split
> > mem = mem.to_f
> > # Normalize mem to KiB
> > case unit
> > when nil: mem *= (1<<0)
> > when 'kB': mem *= (1<<10)
> > when 'MB': mem *= (1<<20)
> > when 'GB': mem *= (1<<30)
> > when 'TB': mem *= (1<<40)
> > end
> > %><%= mem.to_i %>")
>
> I use a custom fact, that returns the amount of system memory in
> megabytes. This is, however, Linux-only, since it uses /proc/meminfo:
>
> $ cat modules/common/lib/facter/memorysize_mb.rb
>
>
> require 'facter'
>
> Facter.add("memorysize_mb") do
>confine :kernel => :Linux
>
>ram = 0
>
># Steal linux's meminfo
>File.open( "/proc/meminfo" , 'r' ) do |f|
>f.grep( /^MemTotal:/ ) { |mem|
>ram = mem.split( / +/ )[1].to_i / 1024
>}
>end
>
>setcode do
>ram
>end
> end
>
>
> > Here's an example of how I then use it :
> >
> > # kernel.shmmax
> > if $shmmax {
> > $shmmax_final = $shmmax
> > } else {
> > if $oracle {
> > # For non-shm half the RAM for <= 4G, 2G otherwise
> > if $mem <= 4294967296 {
> > $shmmax_final = $mem / 2
> > } else {
> > $shmmax_final = $mem - 2147483648
> > }
> > } else {
> > $shmmax_final = $mem
> > }
> > }
>
>
> Best regards,
> Martijn Grendelman
>
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>
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Re: [Puppet Users] using memorysize fact in manifests
Further to this, this is the normal memory code condensed with normalization
removed to give "raw" versions of the facts.
require 'facter'
{ :MemorySizeRaw => "MemTotal",
:MemoryFreeRaw => "MemFree",
:SwapSizeRaw => "SwapTotal",
:SwapFreeRaw => "SwapFree"
}.each do |fact, name|
Facter.add(fact) do
confine :kernel => :linux
setcode do
memsize_raw = ""
Thread::exclusive do
File.readlines("/proc/meminfo").each do |l|
memsize_raw = $1.to_i if l =~ /^#{name}:\s+(\d+)\s+\S+/
# MemoryFree == memfree + cached + buffers
# (assume scales are all the same as memfree)
if name == "MemFree" &&
l =~ /^(?:Buffers|Cached):\s+(\d+)\s+\S+/
memsize_raw += $1.to_i
end
end
end
memsize_raw
end
end
end
Thanks
Chris
On 30 June 2011 13:29, Chris Phillips wrote:
>
> Well that's odd, I was looking at the exact same issue this morning for
> sysctl.conf / oracle stuff.
>
> But why are people writing new facts?? Why not just take a copy of the
> original function and simply not run the function that normalizes the
> number? It seems very odd to make a more limited version of the function
> when it's already there.
>
> Is it not possible to copy the code directly from utils/memory.rb in
> facter?
>
> Chris
>
> On 30 June 2011 13:00, Martijn Grendelman wrote:
>
>> On 30-06-11 11:20, Matthias Saou wrote:
>> > Andreas Kuntzagk wrote:
>> >
>> >> I want some config depending on memorysize.
>> >>
>> >> What I tried was
>> >>if ($memorysize >= 256 * 1024*1024) {
>> >> ...
>> >>}
>> >>
>> >> But this fails because $memorysize is a string (and contains a "G")
>> >> and can't be compared to an int.
>> >>
>> >> Are all facts strings? How do I work with numbers?
>> >
>> > Typical problem. Not to mention that you happen to have "G" but that
>> > could very easily be "M". Here's my workaround for that, which I use
>> > for calculations to then set some sysctl.conf values accordingly :
>> >
>> > # This is ugly, but very useful to get a standard kiB total RAM
>> > # to base further calculations upon. Note that we get a string
>> > $mem = inline_template("<%
>> > mem,unit = scope.lookupvar('::memorysize').split
>> > mem = mem.to_f
>> > # Normalize mem to KiB
>> > case unit
>> > when nil: mem *= (1<<0)
>> > when 'kB': mem *= (1<<10)
>> > when 'MB': mem *= (1<<20)
>> > when 'GB': mem *= (1<<30)
>> > when 'TB': mem *= (1<<40)
>> > end
>> > %><%= mem.to_i %>")
>>
>> I use a custom fact, that returns the amount of system memory in
>> megabytes. This is, however, Linux-only, since it uses /proc/meminfo:
>>
>> $ cat modules/common/lib/facter/memorysize_mb.rb
>>
>>
>> require 'facter'
>>
>> Facter.add("memorysize_mb") do
>>confine :kernel => :Linux
>>
>>ram = 0
>>
>># Steal linux's meminfo
>>File.open( "/proc/meminfo" , 'r' ) do |f|
>>f.grep( /^MemTotal:/ ) { |mem|
>>ram = mem.split( / +/ )[1].to_i / 1024
>>}
>>end
>>
>>setcode do
>>ram
>>end
>> end
>>
>>
>> > Here's an example of how I then use it :
>> >
>> > # kernel.shmmax
>> > if $shmmax {
>> > $shmmax_final = $shmmax
>> > } else {
>> > if $oracle {
>> > # For non-shm half the RAM for <= 4G, 2G otherwise
>> > if $mem <= 4294967296 {
>> > $shmmax_final = $mem / 2
>> > } else {
>> > $shmmax_final = $mem - 2147483648
>> > }
>> > } else {
>> > $shmmax_final = $mem
>> > }
>> > }
>>
>>
>> Best regards,
>> Martijn Grendelman
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Puppet Users" group.
>> To post to this group, send email to puppet-users@googlegroups.com.
>> To unsubscribe from this group, send email to
>> puppet-users+unsubscr...@googlegroups.com.
>> For more options, visit this group at
>> http://groups.google.com/group/puppet-users?hl=en.
>>
>>
>
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