smokeping ERROR: Could not save png to ...

[handwerker]

Hi !
Nach einen Portupgrade vor ein paar Tagen bringe ich smokeping nicht mehr richtig zum Laufen.

Der Teil von smokeping, der die Daten aufzeichnet funktioniert.
Das Problem tritt bei in der Weboberfläche auf.

Das smokeping.fcgi meldet ERROR: Could not save png to ...

Nachdem ich alles mögliche untersucht habe stehe ich etwas auf dem Schlauch.

Meine Umgebung:
Server

: 9.0-RELEASE-p3 FreeBSD 9.0-RELEASE-p3 #0: Tue Jun 12 02:52:29 UTC 2012     root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

Apache:

Server version: Apache/2.2.22 (FreeBSD)
Server built:   Sep 20 2012 12:55:07

Apache Module:

 apachectl -t -D DUMP_MODULES
Loaded Modules:
 core_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 authn_file_module (shared)
 authn_dbm_module (shared)
 authn_anon_module (shared)
 authn_default_module (shared)
 authn_alias_module (shared)
 authz_host_module (shared)
 authz_groupfile_module (shared)
 authz_user_module (shared)
 authz_dbm_module (shared)
 authz_owner_module (shared)
 authz_default_module (shared)
 auth_basic_module (shared)
 auth_digest_module (shared)
 file_cache_module (shared)
 cache_module (shared)
 disk_cache_module (shared)
 dumpio_module (shared)
 reqtimeout_module (shared)
 include_module (shared)
 filter_module (shared)
 charset_lite_module (shared)
 deflate_module (shared)
 log_config_module (shared)
 logio_module (shared)
 env_module (shared)
 mime_magic_module (shared)
 cern_meta_module (shared)
 expires_module (shared)
 headers_module (shared)
 usertrack_module (shared)
 unique_id_module (shared)
 setenvif_module (shared)
 version_module (shared)
 ssl_module (shared)
 mime_module (shared)
 dav_module (shared)
 status_module (shared)
 autoindex_module (shared)
 asis_module (shared)
 info_module (shared)
 cgi_module (shared)
 dav_fs_module (shared)
 vhost_alias_module (shared)
 negotiation_module (shared)
 dir_module (shared)
 imagemap_module (shared)
 actions_module (shared)
 speling_module (shared)
 userdir_module (shared)
 alias_module (shared)
 rewrite_module (shared)
 speedycgi_module (shared)
 fcgid_module (shared)
Syntax OK

In der Liste der Module ist ganz unten zu finden:
speedycgi_module (shared) Diese Modul wurde früher von smokeping verwendet
fcgid_module (shared) Dieses Modul wird von der neueren Version von smokeping verwendet.


Habe die FASTCGI Konfiguration getestet mit eine kleinen Perl Script abgelegt in /usr/local/smokeping/htdocs/foo.fpl

#!/usr/bin/perl -w
#
use strict;
use CGI::Fast;

#------------------------------------------------
# siehe
# http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#fcgidwrapper
#------------------------------------------------
#
while (my $q = CGI::Fast->new) {
        print("Content-Type: text/plain\n\n");
        print( "Fast-CGI TestScript\n\n");
        foreach my $var (sort(keys(%ENV))) {
                my $val = $ENV{$var};
                $val =~ s|\n|\\n|g;
                $val =~ s|"|\\"|g;
                print "${var}=\"${val}\"\n";
        }
        print( "\$0=", $0, "( Program Name )\n");
        print( "\$\$=", $$, "( Process ID )\n");
        print( "\$<=", $<, "( Real User ID )\n");
        print( "\$>=", $>, "( Effective User ID )\n");
        print( "\$(=", $(, "( Real Group ID, Array )\n");
        print( "\$)=", $), "( Effective Group ID, Array )\n");
#------------------------------------------------
        my $datei="/usr/local/smokeping/htdocs/img/__chartscache/testewas.txt";
        if ( -e $datei ) {
                my @dateistatus = stat( $datei ) or die "ERROR: Probleme stat( $datei ): $!";
                print("Der OWNER der  Datei $datei ist $dateistatus[4].\n");
        }else{
                print("Die Datei $datei existiert nicht.\n");
                open FILE, ">", $datei  or die "ERROR: Could not open $datei for writing: $!";
                print FILE "hallo world\n";
                close FILE;
                print("Datei $datei erzeugt.\n");
        }
}
#------------------------------------------------

Das funktioniert wie erwartet.

Ich kenne die Anmerkungen in /usr/ports/UPDATING

 
20120513:
  AFFECTS: users of net-mgmt/smokeping
  AUTHOR: lth@FreeBSD.org

  Smokeping has been updated to 2.6.7, and the web server configuration
  has changed. FastCGI is now preferred. Please check the documentation
  that your web server configuration is OK.

Ursache ist das die smokeping Version 2.6.7_3 Version FASTCGI verwendet und nicht
mehr wie vor Version 2.5 SpeedyCGI
Die Apache Konfiguration habe ich angepasst: /usr/local/etc/apache22/Includes/smokeping.conf

#
# Fuer smokeping 
#
#
# Jetzt mit FastCGI
#-----------------------------------------------------------
#
# Das Modul wird schon in httpd.conf geladen...
#LoadModule fcgid_module libexec/apache22/mod_fcgid.so
#-----------------------------------------------------------
<IfModule mod_fcgid.c>
  <Directory "/usr/local/smokeping/htdocs">
    Options Indexes FollowSymLinks ExecCGI
    AddHandler fcgid-script .fcg .fcgi .fpl
    #
    AllowOverride None
    Order allow,deny
    Allow from all
  </Directory>
</IfModule>
#
#If you are upgrading from mod_fcgid 2.2, you have to rename
#the directives you have used in the config files:
#http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#upgrade
#************************************************************
#===>   Registering installation for ap22-mod_fcgid-2.3.6_1
#-----------------------------------------------------------
<IfModule alias_module>
    # Alias: Maps web paths into filesystem paths and is used to
    # access content that does not live under the DocumentRoot.
    # Example:
    # Alias /webpath /full/filesystem/path
    #
    # If you include a trailing / on /webpath then the server will
    # require it to be present in the URL.  You will also likely
    # need to provide a <Directory> section to allow access to
    # the filesystem path.
    #-------------------------------------------------------------
    # fuer smokeping
    Alias /smokeping "/usr/local/smokeping/htdocs"
</IfModule>
#-----------------------------------------------------------

Die OWNER und Rechte im Filesystem passen meiner Ansicht nach, sonst würde ja das obige Perl-FASTCGI TestScript nicht funktionieren.

Das smokeping.fcgi Script legt in den Verzeichnis __chartschache die *.PNG Dateien an,
jedoch mit Länge 0 Bytes.

Wo könnte ich noch forschen?