PHP-RRD不工作

Question

我正在尝试用php5-rrd libraire创建rrd图。我正在尝试画(LASTHOUR，LASTHOUR，LASTHOUR，draw但效果不佳(可能我的RRA设置丢失了)。我尝试使用"rrd_update“函数。但不起作用。所以尝试使用"rrd_fetch“函数。但是所有的数据都会出现在-NaN上。

这是我的控制台日志。

1426322479:6249:1817
Array
(
    [start] => 1426318800
    [end] => 1426322700
    [step] => 300
    [data] => Array
        (
            [Users] => Array
                (
                    [1426319100] => NAN
                    [1426319400] => NAN
                    [1426319700] => NAN
                    [1426320000] => NAN
                    [1426320300] => NAN
                    [1426320600] => NAN
                    [1426320900] => NAN
                    [1426321200] => NAN
                    [1426321500] => NAN
                    [1426321800] => NAN
                    [1426322100] => NAN
                    [1426322400] => NAN
                    [1426322700] => NAN
                )

            [Games] => Array
                (
                    [1426319100] => NAN
                    [1426319400] => NAN
                    [1426319700] => NAN
                    [1426320000] => NAN
                    [1426320300] => NAN
                    [1426320600] => NAN
                    [1426320900] => NAN
                    [1426321200] => NAN
                    [1426321500] => NAN
                    [1426321800] => NAN
                    [1426322100] => NAN
                    [1426322400] => NAN
                    [1426322700] => NAN
                )

        )

)

这是我的PHP代码

$rrdFile = dirname(__FILE__) . "/speed.rrd";

//create rrd file
rrd_create($rrdFile,
    array(
        "DS:Users:GAUGE:600:0:U",
        "DS:Games:GAUGE:600:0:U",
        "RRA:AVERAGE:0.5:1:1440",
        "RRA:AVERAGE:0.5:5:1440",
        "RRA:AVERAGE:0.5:30:800",
        "RRA:AVERAGE:0.5:120:800",
        "RRA:AVERAGE:0.5:1440:80"
    )
);

//update rrd file
if(!(rrd_update($rrdFile,
    array(
        "N:".rand(0,9999).":".rand(0,9999)
    )
))) {
    $err = rrd_error();
    echo "rrd_update() ERROR: $err\n";
}

// TEST CODE
$result = rrd_fetch( $rrdFile, array( "AVERAGE", "--resolution", "100", "--start", "-1h", "--end", "start+1h" ) );

print_r($result);


//graph output
if(!is_array(rrd_graph(dirname(__FILE__) . "/speed.png",
    array(
        "--start", "-1h",
        "--title", "Status",
        "--vertical-label", "Users & Games",
        "--width", "600",
        "--height", "200",
        "DEF:Users=$rrdFile:Users:AVERAGE",
        "DEF:Games=$rrdFile:Games:AVERAGE",
        "CDEF:cUsers=Users",
        "CDEF:cGames=Games",
        "LINE:cUsers#FF0000",
        "LINE:cGames#00FF00"
    )
))) {
    $err = rrd_error();
    echo "rrd_graph() ERROR: $err\n";
}

Answer 1

您没有足够的样本数据，因此您的图和RRAs是空的。

您的图表设置为绘制过去1小时的图表；由于您有默认的间隔(5分钟)，这意味着只有12个来自最高分辨率RRA的样本。

但是，您没有任何要放入的数据！您只需调用rrd_update一次，时间戳为'now'，这甚至不足以填充一个RRA条目(您将需要至少两个样本，间隔5分钟，才能完全填充一个RRA条目)。

如果您希望生成一些测试数据，可以从过去3600秒的时间戳开始，然后添加12个样本，每次迭代增加300个时间戳。这将导致在您的主要(5分钟) RRA中有11个条目，而在次要的25分钟RRA中可能有2个条目。