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docker_cpu: enable configuring warnings for cpu usage

This commit is contained in:
Andreas Perhab 2024-04-24 10:15:42 +02:00
parent f165c625bf
commit d3f6266814
1 changed files with 69 additions and 5 deletions
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74
plugins/docker/docker_cpu
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@ -19,6 +19,22 @@ Root privilege required to execute docker command.
[docker_cpu]
user root
To enable warnings / critical for single containers you can define them like this to warn when
the container starts using 80% of a CPU core and emit a critical when 100% is used:
[docker_cpu]
user root
env.my_container_warning :80
env.my_container_critical :100
To enable warnings / critical for all containers based on the number of configured cpus you can set
warning_percent and critical_percent as integers.
[docker_cpu]
user root
env.warning_percent 90
env.critical_percent 99
=head1 MAGIC MARKERS
#%# family=auto
@ -26,11 +42,12 @@ Root privilege required to execute docker command.
=head1 VERSION
v.0.1
v.0.2
=head1 AUTHOR
Copyright (C) 2015 Samuel Cantero <scanterog at gmail dot com>
Copyright (C) 2024 Andreas Perhab, WT-IO-IT GmbH <andreas.perhab@wt-io-it.at>
=head1 LICENSE
@ -53,9 +70,40 @@ if ( defined $ARGV[0] and $ARGV[0] eq "autoconf" ) {
$docker =~ s/\s+$//;
my $nanoSecondsInSecond=1000000000;
my @containers = split "\n" , `$docker ps --no-trunc=true`;
my $result;
sub print_warning {
my $name = $_[0];
my $ncpu;
my $type;
if (@_ > 1) {
$ncpu = $_[1];
}
if (@_ > 2) {
$type = $_[2];
} else {
$type = 'warning'
}
if ($ENV{$_[0].'_'.$type}) {
my @defined_warnings = split(/:/, $ENV{$name.'_'.$type});
for my $i (0 .. $#defined_warnings) {
if ($defined_warnings[$i]) {
$defined_warnings[$i] = $defined_warnings[$i] * $nanoSecondsInSecond;
}
}
print "${name}.${type} ".join(":", @defined_warnings)."\n";
} elsif ($ENV{$type.'_percent'} && $ncpu) {
my $percent_warning = ($ncpu * $ENV{$type.'_percent'} * $nanoSecondsInSecond);
print "${name}.${type} :$percent_warning\n";
}
}
sub print_critical {
print_warning($_[0], 0, 'critical')
}
for my $i (1 .. $#containers)
{
my @fields = split / +/, $containers[$i];
@ -96,7 +144,23 @@ for my $i (1 .. $#containers)
$total_cpu_ns =~ s/^usage_usec ([0-9]+).*/$1/;
$total_cpu_ns *= 1000;
close $file;
if (open($file, '<', "/sys/fs/cgroup/system.slice/docker-$id.scope/cpuset.cpus.effective"))
my $ncpu = 0;
if (open($file, '<', "/sys/fs/cgroup/system.slice/docker-$id.scope/cpu.max")) {
# compute ncpu for docker NanoCpus (docker compose: deploy.resources.limit.cpus: "1.0")
# hexdump -C /sys/fs/cgroup/system.slice/docker-f50da4b6c4c6207e875047036a7e56c77c54a8aefa2ea6a0e58bc738852f4514.scope/cpu.max
# 00000000 31 30 30 30 30 30 20 31 30 30 30 30 30 0a |100000 100000.|
# 0000000e
#
# no limit set
# 00000000 6d 61 78 20 31 30 30 30 30 30 0a |max 100000.|
# 0000000b
my $cpu_max = <$file>;
$cpu_max =~ s/\s.*\n$//;
if ($cpu_max ne "max") {
$ncpu = $cpu_max / 100000;
}
}
if ($ncpu == 0 && open($file, '<', "/sys/fs/cgroup/system.slice/docker-$id.scope/cpuset.cpus.effective"))
{
# hexdump -C /sys/fs/cgroup/system.slice/docker-5915a2718628754f9185a052b96c4ac4249692269ad03c54f9037cd9e530f93c.scope/cpuset.cpus.effective
# 00000000 30 2d 31 31 0a |0-11.|
@ -108,7 +172,6 @@ for my $i (1 .. $#containers)
my $cpus = <$file>;
$cpus =~ s/\s+$//;
close $file;
my $ncpu = 0;
for $c (split /,/, $cpus)
{
@cpu_range = split /-/, $c;
@ -121,14 +184,13 @@ for my $i (1 .. $#containers)
$ncpu += $cpu_range[1] - $cpu_range[0] + 1;
}
}
push @result, {'name'=>$name, 'label'=>$label, 'total_cpu_ns'=>$total_cpu_ns, 'ncpu'=>$ncpu};
}
push @result, {'name'=>$name, 'label'=>$label, 'total_cpu_ns'=>$total_cpu_ns, 'ncpu'=>$ncpu};
}
}
if (defined $ARGV[0] and $ARGV[0] eq "config")
{
my $nanoSecondsInSecond=1000000000;
my $graphlimit = 1;
foreach(@result){
if ($$_{'ncpu'} || 1 > $graphlimit){
@ -151,6 +213,8 @@ if (defined $ARGV[0] and $ARGV[0] eq "config")
print "$$_{'name'}.min 0\n";
print "$$_{'name'}.type DERIVE\n";
print "$$_{'name'}.cdef $$_{'name'},$nanoSecondsInSecond,/\n";
print_warning($$_{'name'}, $$_{'ncpu'});
print_critical($$_{'name'});
}
exit 0;
}