Update from v0.12 to v1

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This user guide describes how to update Fluentd to v1.0 from v0.12 or earlier.
For plugin development, see Updating plugin for v1.0 from v0.12.
NOTE: The plugins/configurations using v0.12 API/style are compatible with v1.
Update Fluentd
Fluentd v1 updates depend on specific Ruby and gem versions. For example, Fluentd v1 requires Ruby 2.1 or later so you need to check your ruby version first.
To install v1, type gem install command. Now, v1 will be installed:
$ gem install fluentd
Configuration Style
The configuration style is the same but Fluentd v1 adds several sections for the core features. For example, v1 uses <buffer> section for output's buffer parameters:
v1
<match pattern>
  @type foo
  database db1
  apikey foobarbaz
  # buffer parameters
  <buffer>
    @type file
    path /path/to/buffer
    flush_interval 10s
  </buffer>
</match>
v0.12
<match pattern>
  @type foo
  database db1
  apikey foobarbaz
  # buffer parameters
  buffer_type file
  buffer_path /path/to/buffer
  flush_interval 10s
</match>
This separates configuration parameters into fluentd core features and plugin-specific features. See the "Configuration" panel on the left menu for details on each section.
Note that Fluentd v1 automatically converts v0.12 style into v1.0 style during the startup phase, so you can reuse v0.12 configuration with v1. See compat_parameters for a side-by-side listing of v1 and v0.12 parameters. Of course, v1 configuration is better for using full v1 API features.
Plugin Version
Some popular plugins have already used the new v1 plugin API. v1 API based plugins support useful features like flexible chunk keys, placeholders, etc. So we recommend using the latest plugins for Fluentd v1.
Fluentd v1 supports old v0.12 plugin API so you can use older plugins with v1 without code update.
Treasure Agent (td-agent)
td-agent 3 includes Fluentd v1 series. If you want to use fluentd v1 with td-agent package, use td-agent 3 instead of td-agent 2.
You can upgrade td-agent 2 to 3 by executing install script for td-agent 3 when you use deb/rpm package.
For more details about install script, see the following articles:
​Installing Fluentd using RPM Package (Red Hat Linux)​
​Installing Fluentd using DEB Package (Debian / Ubuntu Linux)​
And then you must reinstall gem packages that you've ever used with td-agent 2.
You should update your td-agent.conf to use Fluentd v1 configuration as soon as possible. For more details, see Configuration style.
Operation
Buffer File Changes
Fluentd v1 changes buffer mechanism for flexibility. The new buffer consists of buffer content and metadata. v0.12 buffer does not have metadata so the new API-based plugin cannot handle old buffer files. You need to flush the existing buffer files before updating the fluentd.
Log Forwarding from v1.0 to v0.12
Log forwarding from v0.12 to v1.0 is no problem but log forwarding from v1.0 to v0.12 has a problem due to timestamp change. See in_forward's FAQ​
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.
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Update Fluentd
Configuration Style
v0.12
Plugin Version
Treasure Agent (td-agent)
Operation
Buffer File Changes
Log Forwarding from v1.0 to v0.12