Send FluentD logs to Axiom

FluentD

FluentD is an open-source log collector that allows you to collect, aggregate, process, analyze, and route log files.

With FluentD, you can collect logs from multiple sources and ship it instantly into Axiom

Installation

Visit the FluentD download page to install FluentD on your system.

You'd need to specify the org-id header if you are using Personal Token, it's best to use an API Token to avoid the need to specify the org-id header.

Learn more about API and Personal Token

Configuration

FluentD lifecycle consist of five different components which are:

Setup: Configure your fluent.conf file.
Inputs: Define your input listeners.
Filters: Create a rule to allow or disallow an event.
Matches: Send output to Axiom when input data match and pair specific data from your data input within your configuration.
Labels: Groups filters and simplifies tag handling.

When setting up fluentD, the configuration file .conf is used to connect its components.

Configuring FluentD using the HTTP Output Plugin

The example below shows a FluentD configuration that sends data to Axiom using the http output plugin:

<source>
  @type forward
  port 24224
</source>

<match *.**>
  @type http

  endpoint https://api.axiom.co/v1/datasets/$DATASET_NAME/ingest
  # Authorization Bearer should be an ingest token
  headers {"Authorization": "Bearer <your-token>"}
  json_array false
  open_timeout 3

  <format>
    @type json
  </format>

  <buffer>
    flush_interval 5s
  </buffer>
</match>

Configuring FluentD using the Opensearch Output Plugin

The example below shows a FluentD configuration that sends data to Axiom using the opensearch plugin:

<source>
  @type tail
  @id input_tail
  <parse>
    @type apache2
  </parse>
  path /var/log/*.log
  tag td.logs
</source>

<match **>
  @type opensearch
  @id out_os
  @log_level info
  include_tag_key true
  include_timestamp true
  host "#{ENV['FLUENT_OPENSEARCH_HOST']  || 'api.axiom.co'}"
  port "#{ENV['FLUENT_OPENSEARCH_PORT'] || '443'}"
  path "#{ENV['FLUENT_OPENSEARCH_PATH']|| '/v1/datasets/$DATASET_NAME/elastic'}"
  scheme "#{ENV['FLUENT_OPENSEARCH_SCHEME'] || 'https'}"
  ssl_verify "#{ENV['FLUENT_OPENSEARCH_SSL_VERIFY'] || 'true'}"
  ssl_version "#{ENV['FLUENT_OPENSEARCH_SSL_VERSION'] || 'TLSv1_2'}"
  user "#{ENV['FLUENT_OPENSEARCH_USER'] || 'axiom'}"
  password "#{ENV['FLUENT_OPENSEARCH_PASSWORD'] || 'xaat-xxxxxxxxxx-xxxxxxxxx-xxxxxxx'}"
  index_name "#{ENV['FLUENT_OPENSEARCH_INDEX_NAME'] || 'fluentd'}"
</match>

Configure Buffer Interval with Filter Patterns

The example below shows a FluentD configuration to hold logs in memory with specific flush intervals, size limits, and how to exclude specific logs based on patterns.

# Collect common system logs
<source>
  @type tail
  @id system_logs
  <parse>
    @type none
  </parse>
  path /var/log/*.log
  pos_file /var/log/fluentd/system.log.pos
  read_from_head true
  tag system.logs
</source>

# Collect Apache2 logs (if they're located in /var/log/apache2/)
<source>
  @type tail
  @id apache_logs
  <parse>
    @type apache2
  </parse>
  path /var/log/apache2/*.log
  pos_file /var/log/fluentd/apache2.log.pos
  read_from_head true
  tag apache.logs
</source>

# Filter to exclude certain patterns (optional)
<filter **>
  @type grep
  <exclude>
    key message
    pattern /exclude_this_pattern/
  </exclude>
</filter>

# Send logs to Axiom
<match **>
  @type opensearch
  @id out_os
  @log_level info
  include_tag_key true
  include_timestamp true
  host "#{ENV['FLUENT_OPENSEARCH_HOST']  || 'api.axiom.co'}"
  port "#{ENV['FLUENT_OPENSEARCH_PORT'] || '443'}"
  path "#{ENV['FLUENT_OPENSEARCH_PATH']|| '/v1/datasets/$DATASET_NAME/elastic'}"
  scheme "#{ENV['FLUENT_OPENSEARCH_SCHEME'] || 'https'}"
  ssl_verify "#{ENV['FLUENT_OPENSEARCH_SSL_VERIFY'] || 'true'}"
  ssl_version "#{ENV['FLUENT_OPENSEARCH_SSL_VERSION'] || 'TLSv1_2'}"
  user "#{ENV['FLUENT_OPENSEARCH_USER'] || 'axiom'}"
  password "#{ENV['FLUENT_OPENSEARCH_PASSWORD'] || 'xaat-xxxxxxxxxx-xxxxxxxxx-xxxxxxx'}"
  index_name "#{ENV['FLUENT_OPENSEARCH_INDEX_NAME'] || 'fluentd'}"
  
  <buffer>
    @type memory
    flush_mode interval
    flush_interval 10s
    chunk_limit_size 5M
    retry_max_interval 30
    retry_forever true
  </buffer>
</match>

Collect and send PHP logs to Axiom

The example below shows a FluentD configuration that sends PHP data to Axiom.

# Collect PHP logs
<source>
  @type tail
  @id php_logs
  <parse>
    @type multiline
    format_firstline /^\[\d+-\w+-\d+ \d+:\d+:\d+\]/
    format1 /^\[(?<time>\d+-\w+-\d+ \d+:\d+:\d+)\] (?<message>.*)/
  </parse>
  path /var/log/php*.log
  pos_file /var/log/fluentd/php.log.pos
  read_from_head true
  tag php.logs
</source>

# Send PHP logs to Axiom
<match php.logs>
  @type opensearch
  @id out_os
  @log_level info
  include_tag_key true
  include_timestamp true
  host "#{ENV['FLUENT_OPENSEARCH_HOST']  || 'api.axiom.co'}"
  port "#{ENV['FLUENT_OPENSEARCH_PORT'] || '443'}"
  path "#{ENV['FLUENT_OPENSEARCH_PATH']|| '/v1/datasets/$DATASET_NAME/elastic'}"
  scheme "#{ENV['FLUENT_OPENSEARCH_SCHEME'] || 'https'}"
  ssl_verify "#{ENV['FLUENT_OPENSEARCH_SSL_VERIFY'] || 'true'}"
  ssl_version "#{ENV['FLUENT_OPENSEARCH_SSL_VERSION'] || 'TLSv1_2'}"
  user "#{ENV['FLUENT_OPENSEARCH_USER'] || 'axiom'}"
  password "#{ENV['FLUENT_OPENSEARCH_PASSWORD'] || 'xaat-xxxxxxxxxx-xxxxxxxxx-xxxxxxx'}"
  index_name "#{ENV['FLUENT_OPENSEARCH_INDEX_NAME'] || 'php-logs'}"
  
  <buffer>
    @type memory
    flush_mode interval
    flush_interval 10s
    chunk_limit_size 5M
    retry_max_interval 30
    retry_forever true
  </buffer>
</match>

Collect and send Scala logs to Axiom

The example below shows a FluentD configuration that sends Scala data to Axiom

# Collect Scala logs
<source>
  @type tail
  @id scala_logs
  <parse>
    @type multiline
    format_firstline /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3}/
    format1 /^(?<time>\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3}) \[(?<thread>.*)\] (?<level>\w+) (?<class>[\w\.$]+) - (?<message>.*)/
  </parse>
  path /var/log/scala-app.log
  pos_file /var/log/fluentd/scala.log.pos
  read_from_head true
  tag scala.logs
</source>

# Send Scala logs using HTTP plugin to Axiom
<match scala.logs>
  @type http
  endpoint "#{ENV['FLUENT_HTTP_ENDPOINT'] || 'https://api.axiom.co/v1/datasets/$DATASET_NAME/ingest'}"
  headers {"Authorization": "Bearer #{ENV['FLUENT_HTTP_TOKEN'] || '<your-token>'}"}
  <format>
    @type json
  </format>
  
  <buffer>
    @type memory
    flush_mode interval
    flush_interval 10s
    chunk_limit_size 5M
    retry_max_interval 30
    retry_forever true
  </buffer>
</match>