Redis module

The redis module parses logs and slowlogs created by Redis.

When you run the module, it performs a few tasks under the hood:

  • Sets the default paths to the log files (but don’t worry, you can override the defaults)
  • Makes sure each multiline log event gets sent as a single event
  • Uses ingest node to parse and process the log lines, shaping the data into a structure suitable for visualizing in Kibana
  • Deploys dashboards for visualizing the log data

Read the quick start to learn how to set up and run modules.

The redis module has two filesets:

  • The log fileset collects and parses the logs that Redis writes to disk.
  • The slowlog fileset connects to Redis via the network and retrieves the slow logs by using the SLOWLOG command.

For the log fileset, make sure the logfile option, from the Redis configuration file, is set to redis-server.log.

For the slowlog fileset, make sure the slowlog-log-slower-than option, from the Redis configuration file, is set to a lower value than the default one.

Compatibility

The Redis log fileset was tested with logs from Redis versions 1.2.6, 2.4.6, and 3.0.2, so we expect compatibility with any version 1.x, 2.x, or 3.x.

On Windows, the default paths assume that Redis was installed from the Chocolatey repository.

The Redis slowlog fileset was tested with Redis 3.0.2 and 2.4.6. We expect compatibility with any Redis version newer than 2.2.12, when the SLOWLOG command was added.

Configure the module

You can further refine the behavior of the redis module by specifying variable settings in the modules.d/redis.yml file, or overriding settings at the command line.

The following example shows how to set paths in the modules.d/redis.yml file to override the default paths for Redis logs. It also shows how to set the host and password to retrieve slow logs:

- module: redis
  log:
    enabled: true
    var.paths: ["/path/to/log/redis/redis-server.log*"]
  slowlog:
    enabled: true
    var.hosts: ["localhost:6378"]
    var.password: "YOUR_PASSWORD"

To specify the same settings at the command line, you use:

-M "redis.log.var.paths=[/path/to/log/redis/redis-server.log*]" -M "redis.slowlog.var.hosts=[localhost:6378]" -M "redis.slowlog.var.password=[YOUR_PASSWORD]"

Variable settings

Each fileset has separate variable settings for configuring the behavior of the module. If you don’t specify variable settings, the redis module uses the defaults.

For more information, see Configure variable settings. Also see Override input settings.

When you specify a setting at the command line, remember to prefix the setting with the module name, for example, redis.log.var.paths instead of log.var.paths.

log fileset settings

var.paths
An array of glob-based paths that specify where to look for the log files. All patterns supported by Go Glob are also supported here. For example, you can use wildcards to fetch all files from a predefined level of subdirectories: /path/to/log/*/*.log. This fetches all .log files from the subfolders of /path/to/log. It does not fetch log files from the /path/to/log folder itself. If this setting is left empty, Filebeat will choose log paths based on your operating system.

slowlog fileset settings

var.hosts
An array of hosts to which Filebeat should connect to retrieve the slow logs. If left empty, localhost:6379 is assumed.
var.password
The password to use to connect to Redis, in case Redis authentication is enabled (the requirepass option in the Redis configuration).

Example dashboard

This module comes with a sample dashboard. For example:

kibana redis

Fields

For a description of each field in the module, see the exported fields section.