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kube-proxy: kernelspace mode is announced to be default for windows #110762

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merged 1 commit into from Jul 18, 2022

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@pandaamanda pandaamanda commented Jun 24, 2022

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

ref #104631
Since the userspace mode is deprecated, the default mode for windows should be kernelspace.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

kube-proxy: The "userspace" proxy-mode is deprecated on Linux and Windows, despite being the default on Windows.  As of v1.26, the default mode for Windows will change to 'kernelspace'.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:


@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. kind/cleanup Categorizes issue or PR as related to cleaning up code, process, or technical debt. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. labels Jun 24, 2022
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k8s-ci-robot commented Jun 24, 2022

@pandaamanda: This issue is currently awaiting triage.

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@k8s-ci-robot k8s-ci-robot added needs-priority Indicates a PR lacks a `priority/foo` label and requires one. sig/network Categorizes an issue or PR as relevant to SIG Network. and removed do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels Jun 24, 2022
@k8s-ci-robot k8s-ci-robot requested review from danwinship and freehan Jun 24, 2022
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pandaamanda commented Jun 24, 2022

/retest

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pandaamanda commented Jun 24, 2022

/retest

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danwinship commented Jun 24, 2022

/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm Indicates that a PR is ready to be merged. label Jun 24, 2022
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pandaamanda commented Jun 24, 2022

/assign @thockin

@pandaamanda pandaamanda changed the title refactor: kernelspace mode should be default for windows kube-proxy: kernelspace mode should be default for windows Jun 25, 2022
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thockin commented Jun 27, 2022

Is this going to break users? Did we announce this change somewhere? When? We rarely change defaults like this without extreme caution.

@k8s-ci-robot k8s-ci-robot added size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. and removed lgtm Indicates that a PR is ready to be merged. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Jun 28, 2022
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pandaamanda commented Jun 28, 2022

Is this going to break users? Did we announce this change somewhere? When? We rarely change defaults like this without extreme caution.

Not yet. It is changed to be an announcement.
Thank you.

@pandaamanda pandaamanda changed the title kube-proxy: kernelspace mode should be default for windows kube-proxy: kernelspace mode is announced to be default for windows Jun 28, 2022
@@ -172,7 +172,7 @@ func (o *Options) AddFlags(fs *pflag.FlagSet) {
fs.Var(&utilflag.IPPortVar{Val: &o.config.MetricsBindAddress}, "metrics-bind-address", "The IP address with port for the metrics server to serve on (set to '0.0.0.0:10249' for all IPv4 interfaces and '[::]:10249' for all IPv6 interfaces). Set empty to disable. This parameter is ignored if a config file is specified by --config.")
fs.BoolVar(&o.config.BindAddressHardFail, "bind-address-hard-fail", o.config.BindAddressHardFail, "If true kube-proxy will treat failure to bind to a port as fatal and exit")
fs.Var(utilflag.PortRangeVar{Val: &o.config.PortRange}, "proxy-port-range", "Range of host ports (beginPort-endPort, single port or beginPort+offset, inclusive) that may be consumed in order to proxy service traffic. If (unspecified, 0, or 0-0) then ports will be randomly chosen.")
fs.Var(&o.config.Mode, "proxy-mode", "Which proxy mode to use: 'iptables' (Linux-only), 'ipvs' (Linux-only), 'kernelspace' (Windows-only), or 'userspace' (Linux/Windows, deprecated). The default value is 'iptables' on Linux and 'userspace' on Windows."+
fs.Var(&o.config.Mode, "proxy-mode", "Which proxy mode to use: 'iptables' (Linux-only), 'ipvs' (Linux-only), 'kernelspace' (Windows-only), or 'userspace' (Linux/Windows, deprecated). The default value is 'iptables' on Linux and 'userspace' on Windows. Since userspace is deprecated and will be remove in future release, it is recommended to use 'kernelspace' on windows and we will set 'kernelspace' as default value in next release."+
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I don't think this is the best place for a full summary. Maybe simply "...and 'userspace' on Windows (will be 'kernelspace' in a future release)."

What we need is notice sent to kubernetes-users, sig-windows, etc mailing lists - so as few people as possible are caught by surprise.

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Got it. Thanks.
I will send an announcement to the dev list and kubernetes-sig-windows list.

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thockin commented Jul 18, 2022

Thanks!

/lgtm
/approve

@k8s-ci-robot k8s-ci-robot added the lgtm Indicates that a PR is ready to be merged. label Jul 18, 2022
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k8s-ci-robot commented Jul 18, 2022

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pandaamanda, thockin

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 18, 2022
@k8s-ci-robot k8s-ci-robot merged commit 8af2c50 into kubernetes:master Jul 18, 2022
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@k8s-ci-robot k8s-ci-robot added this to the v1.25 milestone Jul 18, 2022
@pandaamanda pandaamanda deleted the windows_default_proxy branch Jul 19, 2022
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