Monitoring statystyk serwera Nginx za pomocą rrdtool
14 July 2008
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rrdtool to system statystyk dla serwerów i w dość prosty sposób możemy wykorzystać go do generowania wykresów obrazujących ruch na naszym serwerze Nginx. Instalujemy rrdtool, a w przypadku kompilacji musimy dodać wsparcie dla Perla (Gentoo USE: perl), a Nginx musi być skompilowany z flagą —-with-http_stub_status_module (Gentoo USE: status). Niniejszy artykuł jest tłumaczeniem wpisu z bloga Alexea N. KovyrinaKonfiguracja Nginx
Wystarczy dodać dla danego bloku serwer lokację:location /nginx_status { stub_status on; access_log off; allow JAKIES.IP; deny all; }
Active connections: 1492 server accepts handled requests 2124355 2124355 8278635 Reading: 6 Writing: 405 Waiting: 1081
Generowanie graficznych wykresów
Zapisz poniższy kod perla w pliku .pl:#!/usr/bin/perl
use RRDs;
use LWP::UserAgent;
# katalog na bazę rrdtool
my $rrd = '/home/piotr/nginx';
# katalog na wykresy
my $img = '/home/piotr/nginx';
# URL statusu nginxa
my $URL = "http://localhost/nginx_status";
my $ua = LWP::UserAgent->new(timeout => 30);
my $response = $ua->request(HTTP::Request->new('GET', $URL));
my $requests = 0;
my $total = 0;
my $reading = 0;
my $writing = 0;
my $waiting = 0;
foreach (split(/
/, $response->content)) {
$total = $1 if (/^Active connections:\s+(\d+)/);
if (/^Reading:\s+(\d+).*Writing:\s+(\d+).*Waiting:\s+(\d+)/) {
$reading = $1;
$writing = $2;
$waiting = $3;
}
$requests = $3 if (/^\s+(\d+)\s+(\d+)\s+(\d+)/);
}
#print "RQ:$requests; TT:$total; RD:$reading; WR:$writing; WA:$waiting
";
# if rrdtool database doesn't exist, create it
if (! -e "$rrd/nginx.rrd") {
RRDs::create "$rrd/nginx.rrd",
"-s 60",
"DS:requests:COUNTER:120:0:100000000",
"DS:total:ABSOLUTE:120:0:60000",
"DS:reading:ABSOLUTE:120:0:60000",
"DS:writing:ABSOLUTE:120:0:60000",
"DS:waiting:ABSOLUTE:120:0:60000",
"RRA:AVERAGE:0.5:1:2880",
"RRA:AVERAGE:0.5:30:672",
"RRA:AVERAGE:0.5:120:732",
"RRA:AVERAGE:0.5:720:1460";
}
# insert values into rrd database
RRDs::update "$rrd/nginx.rrd",
"-t", "requests:total:reading:writing:waiting",
"N:$requests:$total:$reading:$writing:$waiting";
# Generate graphs
CreateGraphs("day");
CreateGraphs("week");
CreateGraphs("month");
CreateGraphs("year");
#------------------------------------------------------------------------------
sub CreateGraphs($){
my $period = shift;
RRDs::graph "$img/requests-$period.png",
"-s -1$period",
"-t Requests on nginx",
"--lazy",
"-h", "150", "-w", "700",
"-l 0",
"-a", "PNG",
"-v requests/sec",
"DEF:requests=$rrd/nginx.rrd:requests:AVERAGE",
"LINE2:requests#336600:Requests",
"GPRINT:requests:MAX: Max\: %5.1lf %S",
"GPRINT:requests:AVERAGE: Avg\: %5.1lf %S",
"GPRINT:requests:LAST: Current\: %5.1lf %Sreq/sec",
"HRULE:0#000000";
if ($ERROR = RRDs::error) {
print "$0: unable to generate $period graph: $ERROR
";
}
RRDs::graph "$img/connections-$period.png",
"-s -1$period",
"-t Requests on nginx",
"--lazy",
"-h", "150", "-w", "700",
"-l 0",
"-a", "PNG",
"-v requests/sec",
"DEF:total=$rrd/nginx.rrd:total:AVERAGE",
"DEF:reading=$rrd/nginx.rrd:reading:AVERAGE",
"DEF:writing=$rrd/nginx.rrd:writing:AVERAGE",
"DEF:waiting=$rrd/nginx.rrd:waiting:AVERAGE",
"LINE2:total#22FF22:Total",
"GPRINT:total:LAST: Current\: %5.1lf %S",
"GPRINT:total:MIN: Min\: %5.1lf %S",
"GPRINT:total:AVERAGE: Avg\: %5.1lf %S",
"GPRINT:total:MAX: Max\: %5.1lf %S
",
"LINE2:reading#0022FF:Reading",
"GPRINT:reading:LAST: Current\: %5.1lf %S",
"GPRINT:reading:MIN: Min\: %5.1lf %S",
"GPRINT:reading:AVERAGE: Avg\: %5.1lf %S",
"GPRINT:reading:MAX: Max\: %5.1lf %S
",
"LINE2:writing#FF0000:Writing",
"GPRINT:writing:LAST: Current\: %5.1lf %S",
"GPRINT:writing:MIN: Min\: %5.1lf %S",
"GPRINT:writing:AVERAGE: Avg\: %5.1lf %S",
"GPRINT:writing:MAX: Max\: %5.1lf %S
",
"LINE2:waiting#00AAAA:Waiting",
"GPRINT:waiting:LAST: Current\: %5.1lf %S",
"GPRINT:waiting:MIN: Min\: %5.1lf %S",
"GPRINT:waiting:AVERAGE: Avg\: %5.1lf %S",
"GPRINT:waiting:MAX: Max\: %5.1lf %S
",
"HRULE:0#000000";
if ($ERROR = RRDs::error) {
print "$0: unable to generate $period graph: $ERROR
";
}
}
# katalog na bazę rrdtool my $rrd = '/home/piotr/nginx'; # katalog na wykresy my $img = '/home/piotr/nginx'; # URL statusu nginxa my $URL = "http://localhost/nginx_status";
chmod +x plik.pl
I wykonaj go by wygenerować wykresy:
./plik.pl
Na serwerze można dodać operację tą do crona. Efekt będzie tego typu:
RkBlog
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