Ceph A monitor is consuming excessive memory, possibly due to a memory leak.

A monitor is consuming excessive memory, possibly due to a memory leak.

Thank you! Your submission has been received!

Oops! Something went wrong while submitting the form.

What is

Ceph A monitor is consuming excessive memory, possibly due to a memory leak.

?

Understanding Ceph and Its Purpose

Ceph is an open-source distributed storage system designed to provide excellent performance, reliability, and scalability. It is used to manage large amounts of data across a cluster of computers, offering object, block, and file storage in a unified system. Ceph's architecture is highly fault-tolerant, making it a popular choice for cloud infrastructure and large-scale data storage solutions.

Identifying the Symptom: Monitor Memory Leak

In a Ceph cluster, the monitor (MON) is a critical component responsible for maintaining the cluster map and managing the overall state of the cluster. A common symptom of a problem in Ceph is when a monitor starts consuming excessive memory, which can lead to degraded performance or even failure of the monitor service. This issue is often indicative of a memory leak.

Observed Behavior

Administrators may notice that the memory usage of a monitor process is continuously increasing over time, eventually consuming all available memory on the host machine. This can cause the monitor to crash or become unresponsive, impacting the entire Ceph cluster's stability.

Exploring the Issue: MONITOR_MEMORY_LEAK

The MONITOR_MEMORY_LEAK issue arises when a monitor in the Ceph cluster consumes excessive memory due to a memory leak. This can occur due to bugs in the Ceph software or misconfigurations that lead to inefficient memory usage. Identifying and resolving this issue is crucial to maintaining the health and performance of the Ceph cluster.

Root Cause Analysis

The root cause of a memory leak in a Ceph monitor can vary. It may be due to a specific bug in the version of Ceph being used, or it could be related to the configuration settings that cause the monitor to handle data inefficiently. Monitoring tools and logs can help pinpoint the exact cause of the memory leak.

Steps to Fix the MONITOR_MEMORY_LEAK Issue

To resolve the MONITOR_MEMORY_LEAK issue, follow these detailed steps:

Step 1: Monitor Memory Usage

Use monitoring tools like Grafana or Prometheus to track the memory usage of the monitor process. This will help you identify patterns and determine if the memory usage is indeed abnormal.

Step 2: Check for Known Bugs

Consult the Ceph Bug Tracker to see if there are any known bugs related to memory leaks in the version of Ceph you are using. If a bug is identified, check for any available patches or updates that address the issue.

Step 3: Apply Patches and Updates

If a patch or update is available, apply it to your Ceph cluster. Ensure that you follow the recommended procedures for updating Ceph components to avoid introducing new issues.

Step 4: Restart the Monitor

If the memory leak persists after applying patches, consider restarting the monitor service. Use the following command to restart a monitor:

ceph mon restart <mon_id>

Replace <mon_id> with the identifier of the monitor you wish to restart.

Conclusion

Addressing the MONITOR_MEMORY_LEAK issue is essential for maintaining the stability and performance of your Ceph cluster. By monitoring memory usage, checking for known bugs, applying patches, and restarting the monitor if necessary, you can effectively manage and resolve this issue. For further assistance, consider reaching out to the Ceph community for support and guidance.

Attached error:

Ceph A monitor is consuming excessive memory, possibly due to a memory leak.

Thank you! Your submission has been received!

Oops! Something went wrong while submitting the form.

Master

Ceph

debugging in Minutes

— Grab the Ultimate Cheatsheet

(Perfect for DevOps & SREs)

Most-used commands

Real-world configs/examples

Handy troubleshooting shortcuts

Thankyou for your submission

We have sent the cheatsheet on your email!

Oops! Something went wrong while submitting the form.

Ceph

Cheatsheet

(Perfect for DevOps & SREs)

Most-used commands

Thankyou for your submission

We have sent the cheatsheet on your email!

Oops! Something went wrong while submitting the form.

MORE ISSUES

PGs are undergoing repair operations, often due to data inconsistencies or corruption.

Ceph Monitor disk I/O error affecting Ceph monitor functionality.

A monitor's disk is experiencing I/O errors.

Ceph OSD_DISK_IO_ERROR

An OSD's disk is experiencing I/O errors, affecting its ability to store data.

Ceph MDS_DISK_FULL

The MDS's disk is full, affecting its ability to function properly.

Ceph RADOS Gateway experiencing performance issues due to network problems.

Network configurations or connectivity issues affecting RADOS Gateway communication.

Ceph The RADOS Gateway service is down, affecting object storage access.

The RADOS Gateway service is not running, which could be due to network issues, resource constraints, or configuration errors.

Ceph Network congestion is affecting OSD communication, leading to performance degradation.

Network congestion is affecting OSD communication, leading to performance degradation.

Ceph PG_BACKFILL

PGs are undergoing backfill operations, often due to OSD additions or recoveries.

Ceph POOL_QUOTA_EXCEEDED

A pool has exceeded its configured quota, preventing further writes.

Ceph Monitor experiencing high CPU usage

A monitor is experiencing high CPU usage, affecting its performance.

Ceph OSD_DISK_SLOW

An OSD's disk is performing slowly, affecting its ability to serve data.

Ceph MDS_NETWORK_ISSUE

Network issues are affecting MDS communication, leading to performance problems.

Ceph OSD is experiencing high CPU usage.

An OSD is experiencing high CPU usage, affecting its performance.

Ceph Authentication failures when accessing the RADOS Gateway.

Incorrect credentials or configuration settings.

Ceph PG_SCRUB_ERRORS

Errors occurred during PG scrubbing, possibly due to data corruption.

Ceph A monitor is consuming excessive memory, possibly due to a memory leak.

A monitor is consuming excessive memory, possibly due to a memory leak.

Ceph High network latency is affecting OSD performance.

High network latency

Ceph RGW_BUCKET_NOT_FOUND

A requested bucket does not exist in the RADOS Gateway.

Ceph The MDS is consuming excessive memory, possibly due to a memory leak.

The MDS is consuming excessive memory, possibly due to a memory leak.

Ceph An OSD is consuming excessive memory, possibly due to a memory leak.

The OSD process may have a memory leak, causing it to consume more memory than expected.

Ceph OSD_DISK_FAILURE

An OSD's disk has failed, affecting its ability to store data.

Ceph PG_INCOMPLETE

PGs are incomplete, often due to missing OSDs or data corruption.

Ceph Monitor nodes are experiencing communication issues, leading to quorum problems.

Network issues are affecting monitor communication.

An MDS instance is stale, possibly due to network issues or failover problems.

Ceph Monitor daemon crash in Ceph cluster.

A monitor daemon has crashed, possibly due to software bugs or resource exhaustion.

Ceph An OSD's journal is full, affecting its ability to process writes.

The journal size is insufficient for the current workload, or there may be a configuration issue.

Ceph POOL_NOT_FOUND

A requested pool does not exist, possibly due to configuration errors or deletion.

Ceph OSD_NETWORK_ISSUE

Network issues are affecting OSD communication, leading to degraded performance or failures.

Ceph An OSD is repeatedly going up and down, often due to unstable hardware or network issues.

Unstable hardware or network issues causing OSD flapping.

The RADOS Gateway is experiencing slow performance, possibly due to high load or resource constraints.

Ceph The MDS is overloaded, affecting CephFS performance.

The MDS is overloaded due to high metadata operations, insufficient resources, or improper configuration.

Ceph OSD daemon crash

Software bugs or hardware issues

Ceph PG_UNCLEAN

PGs are not in a clean state, often due to OSD failures or ongoing recovery operations.

Ceph Monitor disk is full, causing operational issues.

The monitor's disk has reached its storage capacity limit.

Ceph INCOMPATIBLE_CLIENT error encountered when a client tries to connect to the Ceph cluster.

A client is using an incompatible version of the Ceph software.

Ceph SLOW_REQUESTS

Requests to the cluster are slow, possibly due to high load or resource contention.

Ceph RADOSGW_UNAVAILABLE

The RADOS Gateway (RGW) is unavailable, affecting object storage access.

Ceph MDS failover is not occurring as expected.

Configuration issues with MDS or improperly configured standby MDS instances.

The Metadata Server (MDS) is down, affecting CephFS operations.

Ceph Communication issues between Ceph components due to network partition.

A network partition is causing communication issues between Ceph components.

Ceph CRUSH_MAP_ERROR

Errors in the CRUSH map configuration, potentially causing data placement issues.

Ceph Authentication failure between Ceph components.

Incorrect keyring or configuration settings.

Ceph An OSD has reached its full capacity, preventing further writes.

An OSD has reached its full capacity, preventing further writes.

Operations are taking longer than expected, possibly due to high load, network latency, or hardware bottlenecks.

Ceph MON_QUORUM_LOST

The monitor quorum is lost, often due to network partitions or multiple monitor failures.

PGs are stuck in a non-active state, possibly due to OSDs being down or network partitions.

Ceph PG_DEGRADED

Placement Groups (PGs) are not fully replicated, often due to OSD failures or network issues.

Ceph An OSD is marked as out, meaning it is not part of the active cluster and not serving data.

The OSD might be down or manually marked out due to maintenance or failure.

Ceph An OSD is marked as down in the Ceph cluster.

Network issues, hardware failure, or the OSD daemon crashing.

Backed by

Resources

Contact

Platform

Connect

Deep Sea Tech Inc. — Made with ❤️ in & 🏢

Doctor Droid