PHP - 不需要資料庫的 Linux 監控

最簡化的網頁監控方案

出社會之後後來因為都找程式設計師的工作，因此就比較少在公司負責 MIS 相關工作。

可是一直都還是有遇到 Linux 使用問題，例如連線出問題是因為記憶體還是頻寬不足，或是 CPU 負載 100% 無法處理。可是沒有一個影響主機運作最少的監控工具，目前市面上的工具大多要資料庫儲存數據，這樣光是監控就要耗費效能，所以 Hoyo 只能自己設計一套不使用資料庫的監控方案。

此原始碼分享到 GitHub (linux-monitor-no-database)

思路

由網頁前端定時詢問主機獲取數值
獲取數值必須盡可能使用最基本的程式，減低獲取數值時系統負擔
將數值儲存在 JavaScript 陣列
使用陣列數值繪製圖表

特色

不需要資料庫
不需要設定定期執行
不需要執行服務
可以得到 CPU 負載、記憶體空間、硬碟空間即時百分比
可以得到即時網路流量以及最近一分鐘流量圖表
手動釋放記憶體快取 CACHE

取得硬體資訊

How do I get the model name of my processor?

// cpu
$command = "grep -m1 'model name' /proc/cpuinfo";
$cpu_name = explode(':', shell_exec($command))[1];

// 記憶體大小
$command = " free -m | grep Mem: | awk '{print $2}' ";
$ram_usage_total = shell_exec($command);

// 硬碟大小
$command = "fdisk -l | grep 'Disk /dev/sdb' | awk '{print $3 $4}'";
$hdd_size = shell_exec($command);

// cpu

$command = "grep -m1 'model name' /proc/cpuinfo";

$cpu_name = explode(':', shell_exec($command))[1];

// 記憶體大小

$command = " free -m | grep Mem: | awk '{print $2}' ";

$ram_usage_total = shell_exec($command);

// 硬碟大小

$command = "fdisk -l | grep 'Disk /dev/sdb' | awk '{print $3 $4}'";

$hdd_size = shell_exec($command);

硬碟大小是需要取得真實大小不是分割後大小，所以使用 fdisk

預設 fdisk -l 列出的資訊是：

Disk /dev/sda: 300 GiB, 322122547200 bytes, 629145600 sectors
Disk model: VBOX HARDDISK   
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5ecf7957

Device     Boot     Start       End   Sectors  Size Id Type
/dev/sda1  *         2048 627144703 627142656  299G 83 Linux
/dev/sda2       627146750 629143551   1996802  975M  5 Extended
/dev/sda5       627146752 629143551   1996800  975M 82 Linux swap / Solaris

Disk /dev/sda: 300 GiB, 322122547200 bytes, 629145600 sectors

Disk model: VBOX HARDDISK

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: dos

Disk identifier: 0x5ecf7957

Device Boot Start End Sectors Size Id Type

/dev/sda1 * 2048 627144703 627142656 299G 83 Linux

/dev/sda2 627146750 629143551 1996802 975M 5 Extended

/dev/sda5 627146752 629143551 1996800 975M 82 Linux swap / Solaris

取得使用數據

網站連線數

// 網站
$command = ' ss -tan | grep ":80 " | grep -v grep | wc -l ';
$netstat_80 = trim(shell_exec($command));

$command = ' ss -tan | grep ":443 " | grep -v grep | wc -l ';
$netstat_443 = trim(shell_exec($command));

$command = ' ss -tan | grep ":3306 " | grep -v grep | wc -l ';
$netstat_3306 = trim(shell_exec($command));

// time wait
$command = ' ss -tan | grep TIME-WAIT | grep -v grep | wc -l ';
$netstat_time_wait = trim(shell_exec($command));

// 網站

$command = ' ss -tan | grep ":80 " | grep -v grep | wc -l ';

$netstat_80 = trim(shell_exec($command));

$command = ' ss -tan | grep ":443 " | grep -v grep | wc -l ';

$netstat_443 = trim(shell_exec($command));

$command = ' ss -tan | grep ":3306 " | grep -v grep | wc -l ';

$netstat_3306 = trim(shell_exec($command));

// time wait

$command = ' ss -tan | grep TIME-WAIT | grep -v grep | wc -l ';

$netstat_time_wait = trim(shell_exec($command));

網卡流量

监控网卡设备流量

// RX
$command = ' cat /proc/net/dev | grep '. NetCode .' | tr : " " | awk \'{print $2}\' ';
$net_rx = number_format(((int)shell_exec($command) / 1024/1024), 2, '.', '');

$command = ' cat /proc/net/dev | grep '. NetCode .' | tr : " " | awk \'{print $10}\' ';
$net_tx = number_format(((int)shell_exec($command) / 1024/1024), 2, '.', '');

// RX

$command = ' cat /proc/net/dev | grep '. NetCode .' | tr : " " | awk \'{print $2}\' ';

$net_rx = number_format(((int)shell_exec($command) / 1024/1024), 2, '.', '');

$command = ' cat /proc/net/dev | grep '. NetCode .' | tr : " " | awk \'{print $10}\' ';

$net_tx = number_format(((int)shell_exec($command) / 1024/1024), 2, '.', '');

硬碟空間

$a = exec('df /');
$a = preg_replace('/\s(?=\s)/', '', $a);
$b = explode(' ', $a);
$hdd_usage = $b[4];

$a = exec('df /');

$a = preg_replace('/\s(?=\s)/', '', $a);

$b = explode(' ', $a);

$hdd_usage = $b[4];

CPU 使用負載

$command = "grep 'cpu ' /proc/stat | awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage \"%\"}'";
$cpu_usage = number_format((float)shell_exec($command), 2, '.', '').'%';

1 2	$command = "grep 'cpu ' /proc/stat \| awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage \"%\"}'"; $cpu_usage = number_format((float)shell_exec($command), 2, '.', '').'%';

記憶體空間

記憶體主要區分有 used, shared, buff/cache 等數值

$command = " free -m | grep Mem: | awk '{print $2}' ";
$ram_total = trim(shell_exec($command));
$command = " free -m | grep Mem: | awk '{print $3}' ";
$ram_used = trim(shell_exec($command));
$command = " free -m | grep Mem: | awk '{print $5}' ";
$ram_shared = trim(shell_exec($command));
$command = " free -m | grep Mem: | awk '{print $6}' ";
$ram_buffer = trim(shell_exec($command));

$command = " free -m | grep Mem: | awk '{print $2}' ";

$ram_total = trim(shell_exec($command));

$command = " free -m | grep Mem: | awk '{print $3}' ";

$ram_used = trim(shell_exec($command));

$command = " free -m | grep Mem: | awk '{print $5}' ";

$ram_shared = trim(shell_exec($command));

$command = " free -m | grep Mem: | awk '{print $6}' ";

$ram_buffer = trim(shell_exec($command));

回傳後在網頁上還原成

背景執行

How do I run PHP's built-in web server in the background?

關閉終端還可以運作

nohup php -S 0.0.0.0:8888 &

1	nohup php -S 0.0.0.0:8888 &

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PHP - 不需要資料庫的 Linux 監控

最簡化的網頁監控方案

思路

特色

取得硬體資訊

取得使用數據

背景執行

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發佈留言

PHP - 不需要資料庫的 Linux 監控

最簡化的網頁監控方案

思路

特色

取得硬體資訊

取得使用數據

背景執行

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