I have set up a glusterfs cluster, providing volumes for pods in kubernetes. There is no problems when mounting volume in the glusterfs way:.
However if you want to use it as a NFS shareyou could try "nfs" spec in pod spec, but you have to make sure the "gluster nfs" service is running in Gluster Cluster. Learn more.
How to mount glusterfs volume using nfs in a kubernetes cluster? Ask Question. Asked 3 years, 1 month ago. Active 2 years, 6 months ago. Viewed times. SetUp failed for volume "kubernetes. Name: "vol1" pod "ef7dfefaf07" UID: "ef7dfefaf07" with: mount failed: exit status 32 Mounting command: mount Mounting arguments: Haoyuan Ge. Haoyuan Ge Haoyuan Ge 1, 1 1 gold badge 11 11 silver badges 28 28 bronze badges. Do not use a gluster location without using the gluster client utils: It will make data NOT available through gluster without a repair action.
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Already on GitHub? Sign in to your account. In kubernetes 1. Leaving it in will generate the below error when trying to create the PVC. This option needs to be removed from the Hello World storage class example. Also, gk-deploy should not even create the "heketi-storage-endpoints" at all since k8s handles the endpoint.[ Kube 20 ] NFS Persistent Volume in Kubernetes Cluster
Sorry, not familiar with that. OCP is always behind Kube as that is downstream and Kube is upstream, so we might have to manage those differences in some way, I guess we also need an OCP version of HelloWorld doc as well. OK, thanks. Familiar with OpenShift, just not that acronym. Kubernetes v1. We do need to maintain compatibility with both Kubernetes and OpenShift. The setup-openshift-heketi-storage command of heketi-cli will need to be trimmed down so it only creates the DB secret and the copy job.
Once these things are done we should be able to get away with not creating them for Kube 1.
Since this PR was last updated, it has been determined that the heketi-storage-endpoints are still required since the heketidbstorage volume is statically provisioned. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. New issue. Jump to bottom. Endpoint changes with k8s 1. Copy link Quote reply. This comment has been minimized.Edit This Page. On-disk files in a Container are ephemeral, which presents some problems for non-trivial applications when running in Containers.
First, when a Container crashes, kubelet will restart it, but the files will be lost - the Container starts with a clean state. Second, when running Containers together in a Pod it is often necessary to share files between those Containers. The Kubernetes Volume abstraction solves both of these problems.
Docker also has a concept of volumesthough it is somewhat looser and less managed. In Docker, a volume is simply a directory on disk or in another Container.
Lifetimes are not managed and until very recently there were only local-disk-backed volumes. Docker now provides volume drivers, but the functionality is very limited for now e. A Kubernetes volume, on the other hand, has an explicit lifetime - the same as the Pod that encloses it.
Consequently, a volume outlives any Containers that run within the Pod, and data is preserved across Container restarts. Of course, when a Pod ceases to exist, the volume will cease to exist, too. Perhaps more importantly than this, Kubernetes supports many types of volumes, and a Pod can use any number of them simultaneously. At its core, a volume is just a directory, possibly with some data in it, which is accessible to the Containers in a Pod.
How that directory comes to be, the medium that backs it, and the contents of it are determined by the particular volume type used. To use a volume, a Pod specifies what volumes to provide for the Pod the.
A process in a container sees a filesystem view composed from their Docker image and volumes. The Docker image is at the root of the filesystem hierarchy, and any volumes are mounted at the specified paths within the image. Volumes can not mount onto other volumes or have hard links to other volumes. Each Container in the Pod must independently specify where to mount each volume.
Unlike emptyDirwhich is erased when a Pod is removed, the contents of an EBS volume are preserved and the volume is merely unmounted.
Make sure the zone matches the zone you brought up your cluster in. And also check that the size and EBS volume type are suitable for your use!There are plenty of great resources out there on the net to explain these things. Catalyst has been working with GlusterFS www. Before this point, like many in the Linux world, Catalyst had utilised NFS heavily in order to present a mounted file system to a number of web or application servers over the network.
While NFS has its challenges, it is a very known quantity that we are extremely comfortable working with.
So after some investigation, experimentation and consultation, we decided upon GlusterFS as the file storage solution for our application. We began with 3. Adopting new file system technologies is always an interesting exercise, as assessing a new type of file system solution is not typically part of the application build cycle. Generally, the file system was "just there" and we knew how to manage it, configure it and diagnose performance issues.
However, with GlusterFS we had to quantify what our expectations were from the file system and then map this into a round of acceptance testing. Some of the decisions around the correct infrastructure choice — meaning AWS EC2 instance size and EBS block storage details — were quite arbitrary and we tended towards the traditional approach of over-provisioning capacity.
GlusterFS is very suitable for large static files that don't change. In this case large meaning megabytes and above. Examples: media files, document assets, images. And it's much better if these files don't change i.
Large immutable write once, never change files were a good fit for GlusterFS. But it is important that whichever application is writing to gluster sticks to this rule. GlusterFS was not a good solution in the case that the web servers were writing small files meaning small number of kilobytes often that change a lot e.
In our case the culprit was Moodle session files. These small data pieces were being constantly read and updated as part of the session management for our Moodle users.
Not good. GlusterFS takes some steps to try to automatically resolve split brain issues but there is no perfect way to always determine which of the versions of a file is correct.
Yes, we have. Under certain application load patterns the mounted gluster file system can become quite fragile and suffer from frightening performance degradation. There have been times when even performing an 'ls' within a mounted directory could cause near meltdown. We put quite a few automated processes in place to monitor, detect and resolve the issues that we discovered through experience.
And if you are going to experiment with GlusterFS you should think long and hard about the usage patterns that your application is going to expose the file system to, and create automated test cases around these. Using caching services, object storage, noSQL solutions and the good old database to hold state and assets.
Still, GlusterFS is still one of the most mature clustered file systems out there. And is certainly worth a look if it might fit your needs. Get in touch if you want some help! Thanks very much to Jordan Tomkinson for all his hard work with GlusterFS over the years and for the help with this article.
For those that are interested in another overview of our application of GlusterFS within a cloud application stack, please check out my presentation at the OpenStack Summit in Barcelona.
Skip to main content. What were the biggest challenges to adopting GlusterFS? What is GlusterFS good for? What was Gluster bad for? What are some of the gotcha's with GlusterFS? You don't get fully redundant file storage for nothing. Some gotcha's we discovered: Backup and restoration is a very different challenge to how these things work with a more traditional network file system like NFS.
It's all possible but we had to dream up some new bespoke strategies.What is GlusterFS? How it is different than NFS? While I have not fully investigated all the functionality of GlusterFS, this article will get you started fast and fill in the blanks.
I have two hosts with a 2tb disk space for replica. Comparison of distributed file systems. Each client accesses each storage server node, with no need for inter-node communication.
For details on preventing this from happening, refer to this page. GlusterFS is a software defined, scale-out storage solution designed to provide affordable and flexible storage for unstructured data.
Glusterfs vs nfs
Now all works well besides the fact that at night or sometimes early mornings servers become a little slow as backups are run. In recent Linux kernels, the default NFS version has been changed from 3 to 4.
Get started with GlusterFS - considerations and installation. First we'll create a two brick volume on two servers, gfs[1,2], then we mount that with the GlusterFS native client, then export that via Samba.
Some options are easier to set up than others, and all have benefits—and drawbacks. This article describes how to deploy the virtual machines, configure the virtual machines, and install a GlusterFS cluster that can be used to store the shared data of a highly available SAP system.
I don't understand this stuff about racehorses. Students will learn how to install, configure, and maintain a cluster of Red Hat Storage servers. This is because the Gluster Client will be able to make direct access to the Gluster Bricks that contain the data. Here we are setting up a two node cluster, however, you can increase the node count based on your needs.
GlusterFS is used to replicate data between multiple servers. GlusterFS 3. Serving static content? Ceph battle, Ceph really does outperform GlusterFS. Not surprisingly as the Kubernetes upstream generally supports GlusterFS. The only way I can figure out to leverage all its benefits is to use the glusterfs client which of course vmware does not support. Clients can mount storage from one or more servers and employ caching to help with performance. You don't get fully redundant file storage for nothing.
Mostly for server to server sync, but would be nice to settle on one system so we can finally drop dropbox too! HDFS is of course the filesystem that's co-developed with the rest of the Hadoop ecosystem, so it's the one that other Hadoop developers are familiar with and tune for.
In Practice I have ran into issues where if many machines are attempting to write to the same volume things slow down really badly, this could be the very old hardware I setup this demo on, or an issue with GlusterFS but I do not have the resources to further test this setup.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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Here, GlusterFS is managed and orchestrated like any other app in Kubernetes. This is a convenient way to unlock the power of dynamically provisioned, persistent GlusterFS volumes in Kubernetes. You can find slides and videos of community presentations here. If you already have a Kubernetes cluster you wish to use, make sure it meets the prerequisites outlined in our setup guide. To run the vagrant setup, you'll need to have the following pre-requisites on your machine:. NOTE : If you plan to run.
You will have to provide your own topology file. When creating your own topology file:. Make sure the topology file only lists block devices intended for heketi's use. The hostnames array is a bit misleading. The following commands are meant to be run with administrative privileges e.
NOTE : To see the version of Kubernetes which will change based on latest official releases simply do kubectl version. This will help in troubleshooting. If you already have a pre-existing GlusterFS cluster, you do not need the -g option.
After this completes, GlusterFS and heketi should now be installed and ready to go. To see an example of how to use this with a Kubernetes application, see the following:. The gluster-kubernetes developers hang out in sig-storage on the Kubernetes Slack and on IRC channels in gluster and heketi at freenode network.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Shell Ruby Makefile.Containerization is revolutionizing how applications are being planned, developed and deployed. While Kubernetes is very useful in aspects like scalability, portability, and management, it lacks support for storing state. What this means is that when a Container crashes, kubelet node agent that runs on each node will restart it, but the files will be lost — the Container starts with a clean state.
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Second, when running Containers together in a Pod it is often necessary to share files between those Containers. To allow the data to exist when the container restarts or terminates, there is a need to use a storage mechanism that manages data outside of the container.
This article provides some of the tools that help solve such storage problems that are inherent in Kubernetes and Docker. OpenEBS is the leading open-source project for container-attached and container-native storage on Kubernetes. This tool adopts Container Attached Storage CAS approach, where each workload is provided with a dedicated storage controller. It implements granular storage policies and isolation that enable users to optimize storage for each specific workload.
OpenEBS runs in userspace and does not have any Linux kernel module dependencies docs. OpenEBS allows you to treat your persistent workload containers, such as DBs on containers, just like other containers. OpenEBS itself is deployed as just another container on your host and enables storage services that can be designated on a per pod, application, cluster or container level.
What ensues is that each volume has a dedicated storage controller that increases the agility and granularity of persistent storage operations of the stateful applications.
OpenEBS incremental snapshot capability saves a lot bandwidth and storage space as only the incremental data is used for backup to object storage targets such as S3. This makes OpenEBS such a powerful tool. With such monitoring possibilities, Stateful applications can be tuned for better performance by observing the traffic data patterns on Prometheus and adjusting the storage policy parameters without worrying about neighbouring workloads that are using OpenEBS.
Copy-on-write snapshots are a key feature of OpenEBS. What is sweeter is that operations on snapshots and clones are performed in completely Kubernetes native method using the standard kubectl command. No more commands while using OpenEBS for this. Moreover, the snapshots are created instantaneously and the number of snapshots that can be created is limitless.
This is a feature that implements High Availability because OpenEBS synchronously replicates the data volume replicas. This feature becomes especially useful to build highly available stateful applications using local disks on cloud providers services such as Google Kubernetes Engine and others. When dealing with Stateful applications, the data is written to cloud provider storage infrastructure.
Since each cloud provider has different implementation of their storage infrastructures, this results in the cloud lock-in of the Stateful applications.
With this abstraction layer in place, it therefore means that data can be moved across Kubernetes layers eliminating the cloud lock-in issue. Unlike traditional storage systems, Metadata of the volume is not centralized and is kept local to the volume. Volume data is synchronously replicated at least on two other nodes. So losing any node results in the loss of volume replicas present only on that node. Therefore in the event of a node failure, the data on other nodes continues to be available at the same performance levels.