Initial import
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#!/usr/bin/perl
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use warnings;
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use strict;
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use JSON;
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use LWP::UserAgent;
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use Encode qw(encode);
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use Data::Dumper;
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use Compress::Zlib;
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use Getopt::Long;
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use Config::Any;
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my $config = '/etc/systemd/journal-gelf.yml';
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my $conf = {};
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if (-e $config) {
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print "Reading config file $config\n";
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$conf = Config::Any->load_files( { files => [ $config ], flatten_to_hash => 1, use_ext => 1 } )->{$config};
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}
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GetOptions (
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'state=s' => \$conf->{state},
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'compress!' => \$conf->{compress},
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'url=s' => \$conf->{url},
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'username=s' => \$conf->{username},
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'password=s' => \$conf->{password}
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);
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$conf->{state} //= '/var/lib/systemd-journal-gelf/state';
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$conf->{compress} //= 1;
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if (
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not $conf->{url} or
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($conf->{username} and not $conf->{password}) or
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(not $conf->{username} and $conf->{password})
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){
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help();
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die;
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}
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print "Starting the Systemd Journal GELF uploader daemon\n";
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my $ua = LWP::UserAgent->new(
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# env_proxy => 1,
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keep_alive => 1
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);
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$ua->default_header( 'Content-Type' => 'application/json' );
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if ( $conf->{compress} ){
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$ua->default_header( 'Accept-Encoding' => HTTP::Message::decodable );
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$ua->default_header( 'Content-Encoding' => 'gzip' );
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}
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# Check if the state file exists and contains a valid cursor
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my $cursor_arg = '';
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open CURSOR, "+<", $conf->{state};
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if (-e $conf->{state}){
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my $cursor = <CURSOR>;
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close CURSOR;
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if ($cursor and $cursor =~ m/^s=[a-z\d]+;i=[a-z\d]+;b=[a-z\d]+;m=[a-z\d]+;t=[a-z\d]+;x=[a-z\d]+$/){
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print "Valid cursor found in " . $conf->{state} . ", will start back from here\n";
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$cursor_arg = " --after-cursor='" . $cursor . "'";
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} else {
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print $conf->{state} . " contains an invalid cursor, so we're wiping it\n";
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unlink $conf->{state};
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}
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}
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open JOURNAL, "journalctl -f -o json$cursor_arg |";
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while (my $entry = <JOURNAL>){
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my $msg = from_json($entry);
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my $gelf = {
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version => 1.1,
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short_message => $msg->{MESSAGE},
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host => $msg->{_HOSTNAME},
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timestamp => int ($msg->{__REALTIME_TIMESTAMP} / (1000 * 1000)),
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level => $msg->{PRIORITY}
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};
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foreach (grep !/^MESSAGE|_HOSTNAME|__REALTIME_TIMESTAMP|PRIORITY$/, keys %$msg){
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my $key = lc (($_ =~ m/^_/) ? $_ : '_' . $_);
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$gelf->{$key} = $msg->{$_};
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}
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my $retry = 0;
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my $resp;
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do {
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if ($retry > 0){
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print "Sending message to " . $conf->{url} . " failed : got code " .
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$resp->code . " (" . $resp->message . "). Tring again in $retry seconds\n";
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sleep $retry;
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}
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$resp = $ua->post($conf->{url}, Content => Compress::Zlib::memGzip(encode('utf-8', to_json($gelf))));
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$retry = ($retry > 0) ? $retry * 2 : 1;
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} while ($resp->code != 202 and $retry < 600);
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if ($resp->code == 202){
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open CURSOR, ">", $conf->{state};
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print CURSOR $msg->{__CURSOR};
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close CURSOR
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} else {
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die "Error sending data to GELF server\n";
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}
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}
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sub help {
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print <<"_EOF"
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Usage: $0 --url=<URL> [--compress|--no-compress] [--user=production --password=secr3t] [--state=/path/to/file]
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* --url is the http or https URL where you will push your gelf formated logs. This is mandatory
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* --compress or --no-compress : will turn on or off gzip compression of logs. Default is on, but can be usefull to disable for debugging
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* --username and --password may be used if URL is protected with a basic auth mecanism. Either both or none must be provided
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* --state can be used to specify where to record the last correctly sent message, so we can start from here when
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systemd-journal-gelf is restarted or if there's a network problem. Default value is /var/lib/systemd-journal-gelf/state
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_EOF
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}
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@ -0,0 +1,22 @@
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[Unit]
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Description=Systemd Journal GEL HTTP uploader
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[Service]
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Type=simple
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User=systemd-journal-gelf
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Group=adm
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ExecStart=/usr/local/bin/systemd-journal-gelf -c /etc/systemd/journal-gelf.yml
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PrivateTmp=yes
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PrivateDevices=yes
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ProtectSystem=full
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ProtectHome=yes
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NoNewPrivileges=yes
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MemoryLimit=200M
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SyslogIdentifier=systemd-journal-gelf
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Restart=on-failure
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StartLimitInterval=0
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RestartSec=30
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[Install]
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WantedBy=multi-user.target
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@ -0,0 +1,15 @@
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---
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# Mandatory setting : URL on which gelf formated message will be posted
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# url: https://graylog.domain.net:12201/gelf
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# Path to a file where we save the last correctly sent message, so we can start
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# back where we left
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# state: /var/lib/systemd-journal-gelf
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# If enabled, data will be compressed before being sent. Default is enabled
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# Might be disabled for debuging purpose
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# compress: True
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# If you http endpoint is protected with basic auth, set username and password
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# username: foo
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# password: p@ssw0rd
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