CoreDNS deployment - manifest applied with '--force' flag

[0x4c6565]

When the CoreDNS deployment is applied to the cluster, the --force flag is used, resulting in non-graceful termination of pods rather than rolling update:

This causes significant DNS disruptions in our clusters.

We can see that the deployment is applied using the custom kube module with a state of latest:

https://github.com/kubernetes-sigs/kubespray/blob/master/roles/kubernetes-apps/ansible/tasks/main.yml#L39-L46

latest state calls the replace function with no arguments, resulting in the default force value of true:

https://github.com/kubernetes-sigs/kubespray/blob/master/library/kube.py#L186-L191

Environment:

Cloud provider or hardware configuration:
Bare metal VMs

OS (printf "$(uname -srm)\n$(cat /etc/os-release)\n"):

Linux 3.10.0-957.5.1.el7.x86_64 x86_64
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

Version of Ansible (ansible --version):

2.8.11

Version of Python (python --version):

3.6.6

Kubespray version (commit) (git rev-parse --short HEAD):

HEAD
eb16986

Network plugin used:

Calico

Command used to invoke ansible:

ansible-playbook cluster.yml -t apps

[fejta-bot]

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/lifecycle stale

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/lifecycle rotten

[0x4c6565]

/remove-lifecycle rotten

[floryut]

@0x4c6565 You may propose a PR to discuss this with the community force: false

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[miff2000]

@0x4c6565 You may propose a PR to discuss this with the community force: false

I've run into these issues myself when performing upgrades @floryut. Shall I put in a PR to switch to force: false as you've suggested?

Any ideas why it was forced in the first place?

[floryut]

@0x4c6565 You may propose a PR to discuss this with the community force: false

I've run into these issues myself when performing upgrades @floryut. Shall I put in a PR to switch to force: false as you've suggested?

Any ideas why it was forced in the first place?

No clue why it was done like that in the first place 🤷

[k8s-triage-robot]

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

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/close

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[0x4c6565]

/reopen

[k8s-ci-robot]

@0x4c6565: Reopened this issue.

In response to this:

/reopen

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[0x4c6565]

I've now added a WIP PR for this issue

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

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