fluentd.conf

<source> 
  type tail 
  path /var/log/foo/bar.log 
  pos_file /var/log/td-agent/foo-bar.log.pos 
  tag foo.bar 
  format /^(?<host>[^ ]*) (?<remote>[^ ]*) - (?<user>[^ ]*) \[(?<time>[^\]]*)\] "(?<method>\S+)(?: +(?<path>[^ ]*) +\S*)?" (?<code>[^ ]*) (?<body_bytes_sent>[^ ]*) "(?<referer>[^\"]*)" "(?<agent>[^\"]*)" "(?<http_x_forwarded_for>[^\"]*)" (?<request_time>[^ ]*) (?<request_length>[^ ]*):(?<bytes_sent>[^ ]*)/ 
  time_format %d/%b/%Y:%H:%M:%S %z 
</source>