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Mackerelのメトリック監視に合わせてメモリーを数値化する
<?php
/**
* [plugin.checks.check_memory]
* command = "php /usr/local/bin/check_memory.php -c 90"
* max_check_attempts = 5
* check_interval = 1
* action = { command = "/etc/init.d/httpd graceful" }
* memo = "httpdによってmemoryが圧迫されたらhttpdをgracefulする"
**/
$check_option = get_check_option_int();
// $meminfo = get_test_data();
$meminfo = `cat /proc/meminfo`;
if (empty($meminfo)) {
echo "Empty meminfo." . PHP_EOL ;
exit(2);
}
$percent_used = get_percent_used_memory($meminfo);
check($percent_used, $check_option);
function check($percent_used, $check_option)
{
if ($percent_used >= $check_option) {
echo "Critical {$check_option}% over, Server {$percent_used}% used." . PHP_EOL;
exit(2);
}
}
function get_check_option_int()
{
// -c hoge or --critical hoge
$check_option = getopt("c:", ["critical:"]);
if (empty($check_option)) {
echo "Empty option" . PHP_EOL;
exit(2);
}
$option = (int)$check_option["c"] ?? (int)$check_option["critical"];
return $option;
}
function get_percent_used_memory($meminfo)
{
$meminfo_array = explode("\n", $meminfo);
/**
* https://github.com/mackerelio/mackerel-agent/blob/master/metrics/linux/memory.go
* Metrics "used" is calculated here like (total - available) for ease.
*/
$meminfo_total = $meminfo_array[0];
$meminfo_available = $meminfo_array[2];
$total = get_parse_value($meminfo_total);
$available = get_parse_value($meminfo_available);
$used = $total - $available;
$percent_used = $used / $total * 100;
return (int)$percent_used;
}
function get_parse_value($meminfo_value)
{
$meminfo_value_parse_array = array_filter(explode(' ', $meminfo_value));
//使ってない
$name = array_shift($meminfo_value_parse_array);
$value = array_shift($meminfo_value_parse_array);
return (int)$value;
}
/**
* cat /proc/meminfo
* @return string
*/
function get_test_data()
{
$input = <<<EOF
MemTotal: 3980400 kB
MemFree: 2161708 kB
MemAvailable: 2732460 kB
Buffers: 142300 kB
Cached: 367132 kB
SwapCached: 2128 kB
Active: 1061712 kB
Inactive: 253028 kB
Active(anon): 769028 kB
Inactive(anon): 58324 kB
Active(file): 292684 kB
Inactive(file): 194704 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 524284 kB
SwapFree: 509948 kB
Dirty: 1452 kB
Writeback: 0 kB
AnonPages: 803420 kB
Mapped: 68868 kB
Shmem: 22044 kB
Slab: 414952 kB
SReclaimable: 372636 kB
SUnreclaim: 42316 kB
KernelStack: 9392 kB
PageTables: 46416 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 2514484 kB
Committed_AS: 5428708 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
AnonHugePages: 204800 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 67560 kB
DirectMap2M: 3016704 kB
DirectMap1G: 1048576 kB
EOF;
return $input;
}
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