OpenStack Object Storage (Swift)
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OpenStack Object Storage (Swift) ZenPack
Monitoring for Swift, OpenStack's object server software.
This is an Open Source ZenPack developed by Zenoss, Inc. Enterprise support for this ZenPack is available to commercial customers with an active subscription.
- Version 0.7.0- Download: Summary of changes: First release.
- Released on 2013/01/03: Compatible with Zenoss Core 2.5.x, Zenoss Core 3.1.x, Zenoss Core 3.2.x, Zenoss Core 4.2.x, Zenoss Resource Manager 4.1.x, Zenoss Resource Manager 4.2.x
This ZenPack allows for monitoring of Swift. Swift is the project name for the Object Store in OpenStack.
From the Swift project site:
Swift is a highly available, distributed, eventually consistent object/blob store. Organizations can use Swift to store lots of data efficiently, safely, and cheaply.
Requirements & Dependencies
All monitoring is performed through the optional swift-recon API endpoint that can be enabled on all of your Swift object servers. Before using this ZenPack you must install and configure swift-recon on your Swift object servers.
Installing the ZenPack will add the following objects to your Zenoss system.
- Configuration Properties
- zSwiftObjectServerPort: Listening port of swift-object-server. Defaults to 6000.
- Monitoring Templates
- SwiftObjectServer in /Devices
- Process Classes
- Event Classes
The zSwiftObjectServerPort property is used by the SwiftObjectServer monitoring template to control what port it will attempt to find the recon API on. Normally the default of 6000/tcp will work unless you've chosen a different port for your swift-object-server process.
By default the SwiftObjectServer monitoring template will not be bound to any devices. To make use of it you will need to either bind it directly to your Swift object server devices, or put your object servers into their own device class and bind the template to that device class. Typically this will be under either /Server/Linux or /Server/SSH/Linux so you get normal operating system monitoring in addition to the Swift-specific monitoring.
Assuming you have swift-recon and Zenoss setup properly you can expect to see the following extra graphs on your Swift object servers.
Swift Object Server - Async Pending: Trend of asynchronous pending tasks. When a Swift proxy server updates an object it attempts to synchronously update the object's container with the new object information. There is a three second timeout on this task and if it can't be completed in that time, it will be put into an asynchronous pending bucket to be executed later. By trending and thresholding on how many tasks are pending you can get an early read on cluster performance problems. By default a maximum threshold of 10 is set on this metric and will raise a warning severity event in the /Perf/Swift event class when it is breached.
Swift Object Server - Disks: Trend of total and unmounted disks on the storage node. Swift's mechanism for detecting failing or failed drives and taking them offline is to unmount them. By proactively monitoring for unmounted disks and replacing them you can keep your cluster healthy. By default a maximum threshold of 0 is set on unmounted disks and will raise a warning severity event in the /Status/Swift event class.
- Swift Object Server - Quarantine: Trend of accounts, containers and objects that have been
- quarantined. Swift has an auditor process that will find corrupt
- items and move them into a quarantine area so good objects will be
- replicated back into their place.
- Sudden increases in quarantined items can indicate hardware problems on storage nodes. Additionally quarantine is not automatically pruned and can result in some storage nodes filling up their disk at a faster rate than others and running out of space. By default a maximum threshold of 100 is set individually on quarantined accounts, containers and objects. A warning event will be raised in the /Status/Swift event class if it is breached.
Swift Object Server - Replication Time: Trend of replication time. Swift has a replicator process that cycles continually. If a single replication cycle takes more than 30 minutes it can reduce the resiliency of the cluster. By default a maximum threshold of 30 minutes is set on replication time and will raise a warning severity event in the /Perf/Swift event class when breached.
Swift Object Server - Load Averages: Trend of 1, 5 and 15 minute operating system load average. Additionally the 15 minute load average divided by total disks is calculated. A perfectly efficient storage node will run at a load average of 1.0 per disk. By default a maximum treshold of 2.0 is set on 15 minute load average divided by total disks and will raise a warning severity event in the /Perf/Swift event class when breached.
Swift Object Server - Process Churn: Trend of processes created per second. High process churn can indicate a broken process being unnecessarily restarted. By default a maximum treshold of 100 processes per second is set and will raise a warning severity event in the /Perf/Swift event class when breached.
Swift Object Server - Disk Usages: Trend of maximum, average and minimum disk usage for all disks in the storage node. These are the primary storage capacity metrics within a cluster. Depending on the size of each individual disk, weights and the skew of store object sizes, an entire cluster can exceed capacity if a single disk runs out of capacity. By default a maximum threshold is set on the maximum usage metric. It will raise a warning severity in the /Status/Swift event class when breached.
Swift Object Server - Disk Sizes: Trend of maximum, average and minimum disk sizes for all disks in the storage node. Ideally all disks in a storage node will be the same size unless weights are closely managed. No default thresholds are set on these metrics.
Swift Object Server - Processes: Trend of total and running processes. No default thresholds are set on these metrics.
All Swift processes will be discovered and monitored based on the process classes listed above. If one of the processes is found to not be running on a node where it should be, an error severity event will be raised in the /Status/OSProcess event class.
Each of the individual Swift process will also be monitored for its CPU and memory utilization.
While this ZenPack currently has wide coverage of metrics that are important to the successful operation of a Swift cluster, there are more opportunities. The following is a list of metrics that are not currently monitored, but would be useful.
- Dispersion Report Results
- Ring consistency between all object, container and account servers.