| |
| Tools and Recipes for ZooKeeper Monitoring |
| ------------------------------------------ |
| |
| How To Monitor |
| -------------- |
| |
| A ZooKeeper cluster can be monitored in two ways: |
| 1. by using the 'mntr' 4letterword command |
| 2. by using JMX to query the MBeans |
| |
| This repo contains tools and recipes for monitoring ZooKeeper using the first method. |
| |
| Check the file JMX-RESOURCE for some links to resources that could help you monitor a ZooKeeper cluster using the JMX interface. |
| |
| Requirements |
| ------------ |
| |
| ZooKeeper 3.4.0 or later or you can apply ZOOKEEPER-744 patch over the latest 3.3.x release. |
| The server should understand the 'mntr' 4letterword command. |
| |
| $ echo 'mntr' | nc localhost 2181 |
| zk_version 3.4.0--1, built on 06/19/2010 15:07 GMT |
| zk_avg_latency 141 |
| zk_max_latency 1788 |
| zk_min_latency 0 |
| zk_packets_received 385466 |
| zk_packets_sent 435364 |
| zk_outstanding_requests 0 |
| zk_server_state follower |
| zk_znode_count 5 |
| zk_watch_count 0 |
| zk_ephemerals_count 0 |
| zk_approximate_data_size 41 |
| zk_open_file_descriptor_count 20 |
| zk_max_file_descriptor_count 1024 |
| zk_fsync_threshold_exceed_count 0 |
| |
| Python 2.6 (maybe it works on previous version but it's not tested yet). |
| |
| In a nutshell |
| ------------- |
| |
| All you need is check_zookeeper.py It has no external dependencies. |
| |
| |
| *** On Nagios call the script like this: |
| |
| ./check_zookeeper.py -o nagios -s "<server-or-list-of-servers>" -k <key> -w <warning> -c <critical> |
| |
| |
| *** On Cacti define a custom data input method using the script like this: |
| |
| ./check_zookeeper.py -o cacti -s "<list-of-servers>" -k <key> --leader |
| |
| -- outputs a single value for the given key fetched from the cluster leader |
| |
| OR |
| |
| ./check_zookeeper.py -o cacti -s "<list-of-servers>" -k <key> |
| |
| -- outputs multiple values on for each cluster node |
| ex: localhost_2182:0 localhost_2183:0 localhost_2181:0 localhost_2184:0 localhost_2185:0 |
| |
| *** On Ganglia: |
| |
| install the plugin found in the ganglia/ subfolder OR |
| |
| ./check_zookeeper.py -o ganglia -s "<current-zookeeper-node>" |
| |
| it will use gmetric to send zookeeper node status data. |
| |
| |
| Check the subfolders for configuration details and samples for each platform. |
| |
| License |
| ------- |
| |
| Apache License 2.0 or later. |
| |
| ZooKeeper 4letterwords Commands |
| ------------------------------- |
| |
| http://zookeeper.apache.org/docs/current/zookeeperAdmin.html#sc_zkCommands |
| |
