Zookeeper collector

Overview

ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services.

This collector monitors one or more ZooKeeper servers, depending on your configuration. It fetches metrics from ZooKeeper by using the mntr command.

Collected metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

global

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
zookeeper.requests	outstanding	requests
zookeeper.requests_latency	min, avg, max	ms
zookeeper.connections	alive	connections
zookeeper.packets	received, sent	pps
zookeeper.file_descriptor	open	file descriptors
zookeeper.nodes	znode, ephemerals	nodes
zookeeper.watches	watches	watches
zookeeper.approximate_data_size	size	KiB
zookeeper.server_state	state	state

Setup

Prerequisites

Whitelist mntr command

Add mntr to Zookeeper's 4lw.commands.whitelist.

Configuration

File

The configuration file name is go.d/zookeeper.conf.

The file format is YAML. Generally, the format is:

update_every: 1
autodetection_retry: 0
jobs:
  - name: some_name1
  - name: some_name1

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/zookeeper.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	1
autodetection_retry	Re-check interval in seconds. Zero means not to schedule re-check.	0
address	Server address. The format is IP:PORT.	127.0.0.1:2181	yes
timeout	Connection/read/write/ssl handshake timeout.	1
use_tls	Whether to use TLS or not.	no
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no
tls_ca	Certification authority that the client uses when verifying the server's certificates.
tls_cert	Client TLS certificate.
tls_key	Client TLS key.

Examples

Basic

Local server.

Config

jobs:
  - name: local
    address: 127.0.0.1:2181

TLS with self-signed certificate

Zookeeper with TLS and self-signed certificate.

Config

jobs:
  - name: local
    address: 127.0.0.1:2181
    use_tls: yes
    tls_skip_verify: yes

Multi-instance

Note: When you define multiple jobs, their names must be unique.

Collecting metrics from local and remote instances.

Config

jobs:
  - name: local
    address: 127.0.0.1:2181

  - name: remote
    address: 192.0.2.1:2181

Troubleshooting

Debug mode

To troubleshoot issues with the zookeeper collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m zookeeper