input {
  file {
    type => "message" 
    path => [ "/var/log/messages" ]
    start_position => "end" 
    stat_interval => 1
    discover_interval => 3
  }
}

filter {
  if [type] == "message" {
    grok {
      match => { "message" => "%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?:\s+%{GREEDYDATA:syslog_message}" }
    }
    date {
      match => [ "syslog_timestamp", "MMM  d HH:mm:ss", "MMM dd HH:mm:ss" ]
    }
  }
}

output {
  stdout {}
}

log_format json_combined escape=json
  '{'
    '"time_local":"$time_local",'
    '"remote_addr":"$remote_addr",'
    '"remote_user":"$remote_user",'
    '"request":"$request",'
    '"status": "$status",'
    '"body_bytes_sent":"$body_bytes_sent",'
    '"request_time":"$request_time",'
    '"http_referrer":"$http_referer",'
    '"http_user_agent":"$http_user_agent"'
  '}';
access_log /var/log/nginx/access.log json_combined;

input {
  file {
    type => "nginx" 
    path => [ "/var/log/nginx/access.log" ]
    start_position => "end" 
  }
}

filter {
  if [type] == "nginx" {
    json {
      source => "message" 
    }
  }
}

output {
  stdout {}
}

log_format json_combined escape=json
  '{'
    '"time_local":"$time_local",'
    '"remote_addr":"$remote_addr",'
    '"remote_user":"$remote_user",'
    '"request":"$request",'
    '"status": "$status",'
    '"body_bytes_sent":"$body_bytes_sent",'
    '"request_time":"$request_time",'
    '"http_referrer":"$http_referer",'
    '"http_user_agent":"$http_user_agent"'
  '}';
access_log syslog:server=unix:/dev/log,tag=nginx,severity=error,nohostname json_combined;

input {
  file {
    type => "syslog" 
    path => [ "/var/log/syslog" ]
    start_position => "end" 
  }
}

filter {
  if [type] == "syslog" {
    grok {
      match => { "message" => "%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?:\s+%{GREEDYDATA:syslog_message}" }
    }
    json {
      source => "[syslog_message]" 
      target => "[nginx_message]" 
    }
  }
}

output {
  stdout {}
}