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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:

MetricDimensionsUnit
zookeeper.requestsoutstandingrequests
zookeeper.requests_latencymin, avg, maxms
zookeeper.connectionsaliveconnections
zookeeper.packetsreceived, sentpps
zookeeper.file_descriptoropenfile descriptors
zookeeper.nodesznode, ephemeralsnodes
zookeeper.watcheswatcheswatches
zookeeper.approximate_data_sizesizeKiB
zookeeper.server_statestatestate

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
NameDescriptionDefaultRequired
update_everyData collection frequency.1
autodetection_retryRe-check interval in seconds. Zero means not to schedule re-check.0
addressServer address. The format is IP:PORT.127.0.0.1:2181yes
timeoutConnection/read/write/ssl handshake timeout.1
use_tlsWhether to use TLS or not.no
tls_skip_verifyServer certificate chain and hostname validation policy. Controls whether the client performs this check.no
tls_caCertification authority that the client uses when verifying the server's certificates.
tls_certClient TLS certificate.
tls_keyClient 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

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