- Move from the old github.com/golang/glog to k8s.io/klog
- klog as explicit InitFlags() so we add them as necessary
- we update the other repositories that we vendor that made a similar
change from glog to klog
* github.com/kubernetes/repo-infra
* k8s.io/gengo/
* k8s.io/kube-openapi/
* github.com/google/cadvisor
- Entirely remove all references to glog
- Fix some tests by explicit InitFlags in their init() methods
Change-Id: I92db545ff36fcec83afe98f550c9e630098b3135
Don't mount single path instead of multipath volumes and always wait until
at least 2 paths are available. Try up to 3 times to get all paths. Try 5
times to get at last 2 paths.
Automatic merge from submit-queue (batch tested with PRs 66916, 67252, 67794, 67619, 67328). 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>.
Using a fixed set of locks, then we don't need to free unused locks anymore.
**What this PR does / why we need it**:
Using a fixed set of locks, then we don't need to free unused locks anymore.
See kubernetes/kubernetes/pull/66442 for discussions.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#65113
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/assign @msau42
/assign @thockin
Automatic merge from submit-queue. 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>.
Attacher/Detacher refactor for local storage
Proposal link: https://github.com/kubernetes/community/pull/2438
**What this PR does / why we need it**:
Attacher/Detacher refactor for the plugins which just need to mount device, but do not need to attach, such as local storage plugin.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
```release-note
Attacher/Detacher refactor for local storage
```
/sig storage
/kind feature
It takes a variable amount of time for the multipath daemon
to create /dev/dm-XX in response to new LUNs being discovered.
The old iscsi_util code only discovered the multipath device
if it was created quickly enough, but in a significant number
of cases, kubelet would grab one of the individual paths and
put a filesystem it on before multipathd could construct a
multipath device.
This change waits for the multipath device to get created for
up to 10 seconds, but only if the PV actually had more than
one portal.
This change ensures that iSCSI block devices are deleted after
unmounting, and implements scanning of individual LUNs rather
than scanning the whole iSCSI bus.
In cases where an iSCSI bus is in use by more than one attachment,
detaching used to leave behind phantom block devices, which could
cause I/O errors, long timeouts, or even corruption in the case
when the underlying LUN number was recycled. This change makes
sure to flush references to the block devices after unmounting.
The original iSCSI code scanned the whole target every time a LUN
was attached. On storage controllers that export multiple LUNs on
the same target IQN, this led to a situation where nodes would
see SCSI disks that they weren't supposed to -- possibly dozens or
hundreds of extra SCSI disks. This caused 3 significant problems:
1) The large number of disks wasted resources on the node and
caused a minor drag on performance.
2) The scanning of all the devices caused a huge number of uevents
from the kernel, causing udev to bog down for multiple minutes in
some cases, triggering timeouts and other transient failures.
3) Because Kubernetes was not tracking all the "extra" LUNs that
got discovered, they would not get cleaned up until the last LUN
on a particular target was detached, causing a logout. This led
to significant complications:
In the time window between when a LUN was unintentially scanned,
and when it was removed due to a logout, if it was deleted on the
backend, a phantom reference remained on the node. In the best
case, the phantom LUN would cause I/O errors and timeouts in the
udev system. In the worst case, the backend could reuse the LUN
number for a new volume, and if that new volume were to be
scheduled to a pod with a phantom reference to the old LUN by the
same number, the initiator could get confused and possibly corrupt
data on that volume.
To avoid these problems, the new implementation only scans for
the specific LUN number it expects to see. It's worth noting that
the default behavior of iscsiadm is to automatically scan the
whole bus on login. That behavior can be disabled by setting
node.session.scan = manual
in iscsid.conf, and for the reasons mentioned above, it is
strongly recommended to set that option. This change still works
regardless of the setting in iscsid.conf, and while automatic
scanning will cause some problems, this change doesn't make the
problems any worse, and can make things better in some cases.
These are all flagged by Go 1.11's
more accurate printf checking in go vet,
which runs as part of go test.
Lubomir I. Ivanov <neolit123@gmail.com>
applied ammend for:
pkg/cloudprovider/provivers/vsphere/nodemanager.go
Google's configure-helper.sh script bind-mounts /var/lib/kubelet somewhere
into /home/kubernetes and thus every mount that Kubernetes does is visible
twice in /proc/mounts.
iSCSI and RBD should not rely on counting on entries in /proc/mounts and
unmount device when Kubernetes thinks it's unusued. Kubernetes tracks
the mounts by itself and most of other volume plugins rely on it safely.
This PR add comments for the background why plugin gets loopback
device and removes loopback device even if operation_generator has
same functionality.
Automatic merge from submit-queue (batch tested with PRs 57399, 57751, 57475). 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>.
iscsi: set node.startup to manual
If the default iSCSI node.startup is set to automatic, if there is a node failure,
any pods on that node will get rescheduled to another node. If the failed node is
later brought back up it will then try to log back in to any iSCSI sessions it had
prior to the failure, which may no longer exist or may be now in-use by the other
nodes.
It appears most platforms keep the open-iscsi default of node.startup-automatic.
But in case this system-wide setting has been changed, and just to be explicit, this
sets node.startup values for kubernetes controlled volumes to manual.
Fixes#21305
```release-note
iSCSI sessions managed by kubernetes will now explicitly set startup.mode to 'manual' to
prevent automatic login after node failure recovery. This is the default open-iscsi mode, so
this change will only impact users who have changed their startup.mode to be 'automatic'
in /etc/iscsi/iscsid.conf.
```
If the default iSCSI node.startup is set to automatic, if there is a node failure,
any pods on that node will get rescheduled to another node. If the failed node is
later brought back up it will then try to log back in to any iSCSI sessions it had
prior to the failure, which may no longer exist or may be now in-use by the other
nodes.
It appears most platforms keep the open-iscsi default of node.startup-automatic.
But in case this system-wide setting has been changed, and just to be explicit, this
sets node.startup values for kubernetes controlled volumes to manual.
Closes issue #21305
Erik Wilson