A Fluentd log agent.

This agent is inspired by fluent-agent-lite.

• Tailing log files (like in_tail)
  • enable to handle multiple files in a single process.
  • parse JSON or LTSV format.
• Forwarding messages to external fluentd (like out_forward)
  • multiple fluentd server can be used. When primary server is down, messages will sent to secondary server.
  • if config.ServerRoundRobin = true, select one server from all servers by round robin.
• Receiving a fluentd's forward protocol messages via TCP (like in_forward)
  • includes simplified on-memory queue.
• Stats monitor httpd server
  • serve an agent stats by JSON format.

Binary releases

or

go get github.com/fujiwara/fluent-agent-hydra/cmd/fluent-agent-hydra/

fluent-agent-hydra [options] TAG TARGET_FILE PRIMARY_SERVER SECONDARY_SERVER

Options

• -f="message": fieldname of fluentd log message attribute (DEFAULT: message)
• -monitor="127.0.0.1:24223": monitor httpd daemon address (DEFAULT: -)

Usage example

fluent-agent-hydra -f msg tagname /path/to/foo.log fluentd.example.com:24224 127.0.0.1:24224

• Field name: "msg"
• Filename: "/path/to/foo.log"
• Primary server: "fluentd.example.com:24224"
• Secondary server: "127.0.0.1:24224"

fluent-agent-hydra -c /path/to/config.toml

A example of config.toml

# global settings
TagPrefix = "nginx"       # "nginx.access", "nginx.error"
FieldName = "message"     # default "message"
ReadBufferSize = 1048576  # default 64KB.
ServerRoundRobin = true   # default false

# tailing log file (in_tail)
[[Logs]]
File = "/var/log/nginx/access.log"
Tag = "access"
# parse as ltsv format. (see http://ltsv.org/)
# Format = "None"(default) | "LTSV" | "JSON"
Format = "LTSV"

# convert column data type
# 'column1_name:type,column2_name:type'
# type = "interger" | "float" | "bool" | otherwise as string
Types = "reqtime:float,size:integer,apptime:float,status:integer"

# parse a time string in log lines, and set it as record's timestamp
TimeParse = true      # default false
TimeKey = "timestamp" # default "time"

# TimeFormat is passed to Golang's time.Parse().
# http://golang.org/pkg/time/#Parse
# default time.RFC3339 == "2006-01-02T15:04:05Z07:00"
TimeFormat = "02/Jan/2006:15:04:05 Z0700"

[[Logs]]
File = "/var/log/nginx/error.log"
Tag = "error"

# forwarding fluentd server (out_forward)
[[Servers]]
Host = "fluentd.example.com"
Port = 24224

[[Servers]]
Host = "fluentd-backup.example.com"
Port = 24224

# receive fluentd forward protocol daemon (in_forward)
[Receiver]
Port = 24224

# stats monitor http daemon
[Monitor]
Host = "localhost"
Port = 24223

When the Format is JSON, fluent-agent-hydra treats a numerical value as float64 even if its type is integer. For treating a numerical value as integer, set a column data type integer with the Types.

Types = "column_name:integer"

Its type is converted to int64.

For enabling stats monitor, specify command line option -m host:port or [Monitor] section in config file.

curl -s [Monitor.Host]:[Monitor.Port]/ | jq .

An example response.

{
  "receiver": {
    "buffered": 0,
    "disposed": 0,
    "messages": 123,
    "max_buffer_messages": 1048576,
    "current_connections": 1,
    "total_connections": 10,
    "address": "[::]:24224"
  },
  "servers": [
    {
      "error": "",
      "alive": true,
      "address": "fluentd.example.com:24224"
    },
    {
      "error": "[2014-08-18 18:25:28.965066394 +0900 JST] dial tcp 192.168.1.11:24224: connection refused",
      "alive": false,
      "address": "fluentd-backup.example.com:24224"
    }
  ],
  "files": {
    "/var/log/nginx/error.log": {
      "error": "",
      "position": 95039,
      "tag": "nginx.error"
    },
    "/var/log/nginx/access.log": {
      "error": "",
      "position": 112093,
      "tag": "nginx.access"
    }
  },
  "sent": {
    "nginx.error": {
      "bytes": 2578,
      "messages": 8
    },
    "nginx.access": {
      "bytes": 44996,
      "messages": 109
    }
  }
}

curl -s [Monitor.Host]:[Monitor.Port]/system | jq .

An example response.

{
  "time": 1417748153556699400,
  "go_version": "go1.3",
  "go_os": "darwin",
  "go_arch": "amd64",
  "cpu_num": 4,
  "goroutine_num": 17,
  "gomaxprocs": 1,
  "cgo_call_num": 48,
  "memory_alloc": 551840,
  "memory_total_alloc": 17886960,
  "memory_sys": 5310712,
  "memory_lookups": 321,
  "memory_mallocs": 4645,
  "memory_frees": 3622,
  "memory_stack": 131072,
  "heap_alloc": 551840,
  "heap_sys": 2097152,
  "heap_idle": 1253376,
  "heap_inuse": 843776,
  "heap_released": 0,
  "heap_objects": 1023,
  "gc_next": 1083088,
  "gc_last": 1417748153454501600,
  "gc_num": 34,
  "gc_per_second": 0.966939666110773,
  "gc_pause_per_second": 0.641048,
  "gc_pause": [
    0.2991,
    0.341948
  ]
}

• AWS EC2 c3.2xlarge
  • Amazon Linux AMI release 2014.03
  • Linux 3.10.48-55.140.amzn1.x86_64 #1 SMP Wed Jul 9 23:32:19 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
• fluentd 0.10.52
  • ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
• fluent-agent-lite 1.0
  • perl This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-linux-thread-multi
• fluent-agent-hydra v0.0.5
  • go version go1.3.1 linux/amd64

Benchmark set fluentd-benchmark/one_forward

• fluent-agent-lite max: 580,000/sec
• fluent-agent-hydra(GOMAXPROCS=1) max: 460,000/sec
• fluent-agent-hydra(GOMAXPROCS=1, ReadBufferSize=1,000,000) max: 550,000/sec (a)
• fluent-agetn-hydra(GOMAXPROCS=2, ReadBufferSize=1,000,000) max: 700,000/sec (b)

• fluent/fluent.go, utils.go imported and modified from github.com/t-k/fluent-logger-golang.
• fluent/server.go imported and modified from github.com/moriyoshi/ik.

Fujiwara Shunichiro fujiwara.shunichiro@gmail.com

Copyright 2014 Fujiwara Shunichiro.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.