collectd

README

The collectd Input

The collectd input allows InfluxDB to accept data transmitted in collectd native format. This data is transmitted over UDP.

A note on UDP/IP OS Buffer sizes

If you're running Linux or FreeBSD, please adjust your OS UDP buffer size limit, see here for more details.

Configuration

Each collectd input allows the binding address, target database, and target retention policy to be set. If the database does not exist, it will be created automatically when the input is initialized. If the retention policy is not configured, then the default retention policy for the database is used. However if the retention policy is set, the retention policy must be explicitly created. The input will not automatically create it.

Each collectd input also performs internal batching of the points it receives, as batched writes to the database are more efficient. The default batch size is 1000, pending batch factor is 5, with a batch timeout of 1 second. This means the input will write batches of maximum size 1000, but if a batch has not reached 1000 points within 1 second of the first point being added to a batch, it will emit that batch regardless of size. The pending batch factor controls how many batches can be in memory at once, allowing the input to transmit a batch, while still building other batches.

The path to the collectd types database file may also be set.

Large UDP packets

Please note that UDP packets larger than the standard size of 1452 are dropped at the time of ingestion. Be sure to set MaxPacketSize to 1452 in the collectd configuration.

Config Example

[[collectd]]
  enabled = true
  bind-address = ":25826" # the bind address
  database = "collectd" # Name of the database that will be written to
  retention-policy = ""
  batch-size = 5000 # will flush if this many points get buffered
  batch-pending = 10 # number of batches that may be pending in memory
  batch-timeout = "10s"
  read-buffer = 0 # UDP read buffer size, 0 means to use OS default
  typesdb = "/usr/share/collectd/types.db"

Documentation

Index

• Constants
• type Config
  • func NewConfig() Config
  • func (c *Config) WithDefaults() *Config
• type Service
  • func NewService(c Config) *Service
  • func (s *Service) Addr() net.Addr
  • func (s *Service) Close() error
  • func (s *Service) Err() chan error
  • func (s *Service) Open() error
  • func (s *Service) SetLogOutput(w io.Writer)
  • func (s *Service) SetTypes(types string) (err error)
  • func (s *Service) Statistics(tags map[string]string) []models.Statistic
  • func (s *Service) UnmarshalCollectd(packet *gollectd.Packet) []models.Point
• type Statistics

Constants

const (
	// DefaultBindAddress is the default port to bind to
	DefaultBindAddress = ":25826"

	// DefaultDatabase is the default DB to write to
	DefaultDatabase = "collectd"

	// DefaultRetentionPolicy is the default retention policy of the writes
	DefaultRetentionPolicy = ""

	// DefaultBatchSize is the default write batch size.
	DefaultBatchSize = 5000

	// DefaultBatchPending is the default number of pending write batches.
	DefaultBatchPending = 10

	// DefaultBatchDuration is the default batch timeout duration.
	DefaultBatchDuration = toml.Duration(10 * time.Second)

	// DefaultTypesDB is the default location of the collectd types db file.
	DefaultTypesDB = "/usr/share/collectd/types.db"

	// DefaultReadBuffer is the default buffer size for the UDP listener.
	// Sets the size of the operating system's receive buffer associated with
	// the UDP traffic. Keep in mind that the OS must be able
	// to handle the number set here or the UDP listener will error and exit.
	//
	// DefaultReadBuffer = 0 means to use the OS default, which is usually too
	// small for high UDP performance.
	//
	// Increasing OS buffer limits:
	//     Linux:      sudo sysctl -w net.core.rmem_max=<read-buffer>
	//     BSD/Darwin: sudo sysctl -w kern.ipc.maxsockbuf=<read-buffer>
	DefaultReadBuffer = 0
)

Types

type Config

type Config struct {
	Enabled         bool          `toml:"enabled"`
	BindAddress     string        `toml:"bind-address"`
	Database        string        `toml:"database"`
	RetentionPolicy string        `toml:"retention-policy"`
	BatchSize       int           `toml:"batch-size"`
	BatchPending    int           `toml:"batch-pending"`
	BatchDuration   toml.Duration `toml:"batch-timeout"`
	ReadBuffer      int           `toml:"read-buffer"`
	TypesDB         string        `toml:"typesdb"`
}

Config represents a configuration for the collectd service.

func NewConfig

func NewConfig() Config

NewConfig returns a new instance of Config with defaults.

func (*Config) WithDefaults

func (c *Config) WithDefaults() *Config

WithDefaults takes the given config and returns a new config with any required default values set.

type Service

type Service struct {
	Config       *Config
	MetaClient   metaClient
	PointsWriter pointsWriter
	Logger       *log.Logger
	// contains filtered or unexported fields
}

Service represents a UDP server which receives metrics in collectd's binary protocol and stores them in InfluxDB.

func NewService

func NewService(c Config) *Service

NewService returns a new instance of the collectd service.

func (*Service) Addr

func (s *Service) Addr() net.Addr

Addr returns the listener's address. Returns nil if listener is closed.

func (*Service) Close

func (s *Service) Close() error

Close stops the service.

func (*Service) Err

func (s *Service) Err() chan error

Err returns a channel for fatal errors that occur on go routines.

func (*Service) Open

func (s *Service) Open() error

Open starts the service.

func (*Service) SetLogOutput

func (s *Service) SetLogOutput(w io.Writer)

SetLogOutput sets the writer to which all logs are written. It must not be called after Open is called.

func (*Service) SetTypes

func (s *Service) SetTypes(types string) (err error)

SetTypes sets collectd types db.

func (*Service) Statistics

func (s *Service) Statistics(tags map[string]string) []models.Statistic

Statistics returns statistics for periodic monitoring.

func (*Service) UnmarshalCollectd

func (s *Service) UnmarshalCollectd(packet *gollectd.Packet) []models.Point

Unmarshal translates a collectd packet into InfluxDB data points.

type Statistics

type Statistics struct {
	PointsReceived       int64
	BytesReceived        int64
	PointsParseFail      int64
	ReadFail             int64
	BatchesTransmitted   int64
	PointsTransmitted    int64
	BatchesTransmitFail  int64
	InvalidDroppedPoints int64
}

Statistics maintains statistics for the collectd service.