845a55dbbd
Automatic merge from submit-queue (batch tested with PRs 64844, 63176). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Fix discovery/deletion of iscsi block devices This PR modifies the iSCSI attach/detatch codepaths in the following ways: 1) After unmounting a filesystem on an iSCSI block device, always flush the multipath device mapper entry (if it exists) and delete all block devices so the kernel forgets about them. 2) When attaching an iSCSI block device, instead of blindly attempting to scan for the new LUN, first determine if the target is already logged into, and if not, do the login first. Once every portal is logged into, the scan is done. 3) Scans are now done for specific devices, instead of the whole bus. This avoids discovering LUNs that kubelet has no interest in. 4) Additions to the underlying utility interfaces, with new tests for the new functionality. 5) Some existing code was shifted up or down, to make the new logic work. 6) A typo in an existing exec call on the attach path was fixed. Fixes #59946 ```release-note When attaching iSCSI volumes, kubelet now scans only the specific LUNs being attached, and also deletes them after detaching. This avoids dangling references to LUNs that no longer exist, which used to be the cause of random I/O errors/timeouts in kernel logs, slowdowns during block-device related operations, and very rare cases of data corruption. ```
Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts; providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically-scheduled and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To start developing Kubernetes
The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.
If you want to build Kubernetes right away there are two options:
You have a working Go environment.
$ go get -d k8s.io/kubernetes
$ cd $GOPATH/src/k8s.io/kubernetes
$ make
You have a working Docker environment.
$ git clone https://github.com/kubernetes/kubernetes
$ cd kubernetes
$ make quick-release
For the full story, head over to the developer's documentation.
Support
If you need support, start with the troubleshooting guide, and work your way through the process that we've outlined.
That said, if you have questions, reach out to us one way or another.