redis-collectd-plugin

A Redis plugin for collectd using collectd's Python plugin.

You can capture any kind of Redis metrics like:

Memory used
Commands processed per second
Number of connected clients and slaves
Number of blocked clients
Number of keys stored (per database)
Uptime
Changes since last save
Replication delay (per slave)

Install

Place redis_info.py in /opt/collectd/lib/collectd/plugins/python (assuming you have collectd installed to /opt/collectd).
Configure the plugin (see below).
Restart collectd.

Configuration

Add the following to your collectd config or use the included redis.conf.

    # Configure the redis_info-collectd-plugin

    <LoadPlugin python>
      Globals true
    </LoadPlugin>

    <Plugin python>
      ModulePath "/opt/collectd/lib/collectd/plugins/python"
      Import "redis_info"

      <Module redis_info>
        Host "localhost"
        Port 6379
        # Un-comment to use AUTH
        #Auth "1234"
        Verbose false
        #Instance "instance_1"
        # Catch Redis metrics (prefix with Redis_)
        Redis_uptime_in_seconds "gauge"
        Redis_uptime_in_days "gauge"
        Redis_lru_clock "counter"
        Redis_connected_clients "gauge"
        Redis_connected_slaves "gauge"
        Redis_blocked_clients "gauge"
        Redis_evicted_keys "gauge"
        Redis_used_memory "bytes"
        Redis_used_memory_peak "bytes"
        Redis_changes_since_last_save "gauge"
        Redis_instantaneous_ops_per_sec "gauge"
        Redis_rdb_bgsave_in_progress "gauge"
        Redis_total_connections_received "counter"
        Redis_total_commands_processed "counter"
        Redis_keyspace_hits "derive"
        Redis_keyspace_misses "derive"
        #Redis_master_repl_offset "gauge"
        #Redis_master_last_io_seconds_ago "gauge"
        #Redis_slave_repl_offset "gauge"
      </Module>
    </Plugin>

Multiple Redis instances

You can configure to monitor multiple redis instances by the same machine by repeating the section, such as:

<Plugin python>
  ModulePath "/opt/collectd_plugins"
  Import "redis_info"

  <Module redis_info>
    Host "127.0.0.1"
    Port 9100
    Verbose true
    Instance "instance_9100"
    Redis_uptime_in_seconds "gauge"
    Redis_used_memory "bytes"
    Redis_used_memory_peak "bytes"
  </Module>

  <Module redis_info>
    Host "127.0.0.1"
    Port 9101
    Verbose true
    Instance "instance_9101"
    Redis_uptime_in_seconds "gauge"
    Redis_used_memory "bytes"
    Redis_used_memory_peak "bytes"
    Redis_master_repl_offset "gauge"
  </Module>
  
  <Module redis_info>
    Host "127.0.0.1"
    Port 9102
    Verbose true
    Instance "instance_9102"
    Redis_uptime_in_seconds "gauge"
    Redis_used_memory "bytes"
    Redis_used_memory_peak "bytes"
    Redis_slave_repl_offset "gauge"
  </Module>
</Plugin>

These 3 redis instances listen on different ports, they have different plugin_instance combined by Host and Port:

"plugin_instance" => "127.0.0.1:9100",
"plugin_instance" => "127.0.0.1:9101",
"plugin_instance" => "127.0.0.1:9102",

These values will be part of the metric name emitted by collectd, e.g. collectd.redis_info.127.0.0.1:9100.bytes.used_memory

If you want to set a static value for the plugin instance, use the Instance configuration option:

...
  <Module redis_info>
    Host "127.0.0.1"
    Port 9102
    Instance "redis-prod"
  </Module>
...

This will result in metric names like: collectd.redis_info.redis-prod.bytes.used_memory

Instance can be empty, in this case the name of the metric will not contain any reference to the host/port. If it is omitted, the host:port value is added to the metric name.

Graph examples

These graphs were created using collectd's rrdtool plugin and drraw.

Requirements