Re: [Puppet Users] using memorysize fact in manifests
Andreas Kuntzagk andreas.kuntz...@mdc-berlin.de 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 *= (10)
when 'kB': mem *= (110)
when 'MB': mem *= (120)
when 'GB': mem *= (130)
when 'TB': mem *= (140)
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 = $mem
}
}
HTH,
Matthias
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Re: [Puppet Users] using memorysize fact in manifests
On 30-06-11 11:20, Matthias Saou wrote:
Andreas Kuntzagk andreas.kuntz...@mdc-berlin.de wrote:
I want some config depending on memorysize.
What I tried was
if ($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 *= (10)
when 'kB': mem *= (110)
when 'MB': mem *= (120)
when 'GB': mem *= (130)
when 'TB': mem *= (140)
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 = $mem
}
}
Best regards,
Martijn Grendelman
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Re: [Puppet Users] using memorysize fact in manifests
Well that's odd, I was looking at the exact same issue this morning for
sysctl.conf / oracle stuff.
But why are people writing new facts?? Why not just take a copy of the
original function and simply not run the function that normalizes the
number? It seems very odd to make a more limited version of the function
when it's already there.
Is it not possible to copy the code directly from utils/memory.rb in
facter?
Chris
On 30 June 2011 13:00, Martijn Grendelman mart...@iphion.nl wrote:
On 30-06-11 11:20, Matthias Saou wrote:
Andreas Kuntzagk andreas.kuntz...@mdc-berlin.de wrote:
I want some config depending on memorysize.
What I tried was
if ($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 *= (10)
when 'kB': mem *= (110)
when 'MB': mem *= (120)
when 'GB': mem *= (130)
when 'TB': mem *= (140)
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
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 += $1.to_i
end
end
end
memsize_raw
end
end
end
Thanks
Chris
On 30 June 2011 13:29, Chris Phillips ch...@untrepid.com wrote:
Well that's odd, I was looking at the exact same issue this morning for
sysctl.conf / oracle stuff.
But why are people writing new facts?? Why not just take a copy of the
original function and simply not run the function that normalizes the
number? It seems very odd to make a more limited version of the function
when it's already there.
Is it not possible to copy the code directly from utils/memory.rb in
facter?
Chris
On 30 June 2011 13:00, Martijn Grendelman mart...@iphion.nl wrote:
On 30-06-11 11:20, Matthias Saou wrote:
Andreas Kuntzagk andreas.kuntz...@mdc-berlin.de wrote:
I want some config depending on memorysize.
What I tried was
if ($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 *= (10)
when 'kB': mem *= (110)
when 'MB': mem *= (120)
when 'GB': mem *= (130)
when 'TB': mem *= (140)
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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