Troubleshooting methods for Zookeeper on CentOS
Apr 14, 2025 pm 04:30 PMTroubleshooting Guide for ZooKeeper under CentOS System
This article provides a step-by-step guide to help you effectively troubleshoot ZooKeeper faults on CentOS systems.
1. Verify the status of the ZooKeeper service
First, check the status of the ZooKeeper service using the following command:
sudo systemctl status zookeeper
If the service is not running, start with the following command:
sudo systemctl start zookeeper
To make it power on and start:
sudo systemctl enable zookeeper
2. Analyze ZooKeeper logs
Check the ZooKeeper log file (usually located in /var/log/zookeeper/zookeeper.out
) for troubleshooting clues.
3. Check the configuration file zoo.cfg
Carefully check the zoo.cfg
file to ensure that all parameters (server address, data directory, client port, etc.) are configured correctly.
4. Check the firewall settings
Confirm that the firewall does not block the port used by ZooKeeper (default port 2181). You can temporarily close the firewall using the following command (production environment is not recommended):
sudo systemctl stop firewalld.service
Alternatively, permanently shut down the firewall ( a more secure firewall policy is strongly recommended in production environments, such as allowing specific IP addresses to access port 2181 ):
sudo systemctl stop firewalld sudo systemctl disable firewalld
5. Verify Java environment
Make sure Java environment variables are set correctly. You can edit the /etc/profile
file, add the following and execute source /etc/profile
to make the configuration take effect:
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk # Please replace it with your Java installation path export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export ZOOKEEPER_HOME=/etc/apache/zookeeper # Please replace it with your ZooKeeper installation path export PATH=$ZOOKEEPER_HOME/bin:$PATH
6. Use four-character command to monitor the cluster
ZooKeeper provides a set of four-word commands (such as stat
, ruok
, mntr
) for monitoring cluster status and debugging problems.
7. Test network connection between nodes
Use the ping
or telnet
command to test network connectivity between all nodes in the ZooKeeper cluster.
8. Monitor resource usage
Check the node's CPU, memory, and disk usage to identify potential resource bottlenecks.
9. Handle FAQs
- Node downtime: Check the abnormal situation before the node downtime, confirm whether the server resources are sufficient, and check the node disk I/O performance.
- Network problem: Check the network connection between servers to ensure that the ZooKeeper nodes can communicate with each other.
- Frequent Leader Switching: Check the performance and network status of the Leader node to see if there is any failure in Follower synchronization in the log.
If the problem persists, please refer to the official ZooKeeper documentation or seek community support. Remember to operate your firewall settings carefully in production environments and prioritize safer alternatives.
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