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ZH-trans: merge release1.16-temporary to master (#18217)

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* zh-trans:/docs/docs/concepts/workloads/pods/ephemeral-containers.md (#16948)

* update zh-trans of define-environment-variable-container.md (#16999)

Signed-off-by: Yixiang2019 <wang.yixiang@zte.com.cn>

* update chinese docs (#16985)

* Fix ordered list (#16988)

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update

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* zh-trans:/docs/reference/setup-tools/kubeadm/kubeadm-upgrade-phase.md (#16951)

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update

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update

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* Remove redundant symbol and fix some ordered list (#17000)

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update

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* update-zh-translation/docs/reference/setup-tools/kubeadm/kubeadm-init.md (#16997)

* update zh translation kubeadm-reset.md kubeadm-upgrade.md (#16992)

* Create kubeadm_join_phase_control-plane-join_all.md (#16987)

* Update web-ui-dashboard.md (#16976)

* update format problem (#16956)

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update

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* zh-trans:/docs/docs/concepts/storage/volume-pvc-datasource.md (#17021)

* update zh translation /docs/reference/access-authn-authz/webhook.md (#16860)

* fix confict update zh translation (#16863)

* zh-trans:/docs/concepts/workloads/pods/disruptions.md (#16983)

* zh-trans:/docs/concepts/workloads/pods/disruptions.md

* Update content/zh/docs/concepts/workloads/pods/disruptions.md

Co-Authored-By: Qiming <tengqim@cn.ibm.com>

* update zh translation content/zh/docs/reference/command-line-tools-reference/kube-scheduler.md (#17006)

* Update RC's link (#16935)

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Update

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update the style

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* Update the links for /zh/docs/setup (#16938)

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* zh-trans:/docs/docs/concepts/services-networking/dual-stack.md (#17024)

* update zh translation /reference/setup-tools/kubeadm/generated/kubeadm.md (#17036)

* update zh tanslation /reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config_download.md (#17037)

* update zh translation -/reference/setup-tools/kubeadm/generated/kubeadm_alpha.md (#17038)

* update zh translation /docs/contribute/participating.md (#17040)

* Fix cri-o's links to match English docs (#16936)

Signed-off-by: PingWang <wang.ping5@zte.com.cn>

* update zh translation content/zh/docs/reference/kubectl/jsonpath.md (#16862)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_token_generate.md (#17049)

* update Unkown ->  Unknown (#17062)

* zh-translation:high-availability.md (#16960)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* update Runnning -> Running (#17061)

* zh-trans:/docs/docs/concepts/storage/volume-snapshots.md (#17054)

* update zh transation /docs/reference/setup-tools/kubeadm/generated/kubeadm_reset.md (#17060)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_token_create.md (#17052)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_token.md (#17055)

* update zh translation update-zh-translation-/docs/reference/setup-tools/kubeadm/generated/kubeadm_token_list.md (#17048)

* update zh-translation:ha-topology.md (#17099)

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* zh-trans /reference/setup-tools/kubeadm/generated/kubeadm_config_images_list.md (#17093)

* update zh translation /reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_all.md (#17083)

* Add Chinese translation for scheduler-perf-tuning (#17087)

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for scheduler-perf-tuning

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for scheduler-perf-tuning

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for scheduler-perf-tuning

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

* zh trans content/zh/docs/setup/production-environment/tools/kubeadm/control-plane-flags.md (#17121)

* update zh trans content/zh/docs/tasks/access-application-cluster/service-access-application-cluster.md (#17122)

* zh-translation:content/zh/docs/tasks/administer-cluster/namespaces-walkthrough.md (#17105)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* update-zh-translation-/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_migrate.md (#17091)

* update zh trans /docs/setup/learning-environment/minikube.md (#17143)

* update zh trans /zh/docs/reference/_index.md (#17146)

* update zh trans /docs/tasks/access-application-cluster/port-forward-access-application-cluster.md (#17134)

* update zh translation 20191020-update-zh-translation-/docs/contribute/localization.md (#17046)

* update zh trans /docs/reference/using-api/client-libraries.md (#17144)

* update zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_version.md (#17145)

* update zh /docs/reference/setup-tools/kubeadm/generated/kubeadm_upgrade_node.md (#17131)

* update zh translation /reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_front-proxy-client.md (#17081)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubeconfig.md (#17078)

* add zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-join_update-status.md (#17076)

* update zh trans content/zh/docs/contribute/generate-ref-docs/kubectl.md (#17165)

* update zh translation /reference/command-line-tools-reference/kube-proxy.md (#17107)

* zh-trans:/docs/docs/concepts/workloads/pods/pod-topology-spread-const… (#16955)

* zh-trans:/docs/docs/concepts/workloads/pods/pod-topology-spread-constraints.md

* Update pod-topology-spread-constraints.md

* zh-trans:/docs/concepts/configuration/scheduling-framework.md (#17088)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-config_kubelet.md (#17079)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_control-plane_apiserver.md (#17077)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-join.md (#17075)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_token_delete.md (#17050)

* update zh trans /docs/concepts/overview/working-with-objects/namespaces.md (#17205)

* update zh trans /docs/concepts/overview/what-is-kubernetes.md (#17203)

* pr_release-1.16_crictl (#17201)

* update zh docs/tasks/administer-cluster/dns-debugging-resolution.md (#17186)

* update zh trans content/zh/docs/concepts/overview/working-with-objects/field-selectors.md (#17191)

* translate configure_upgrade_etcd (#17160)

* translate kubeadm_upgrade_apply (#17159)

* update zh /docs/tasks/job/coarse-parallel-processing-work-queue.md (#17155)

* translate docs/setup/release/version-skew-policy.md to Chinese (#17142)

* update zh trans content/zh/docs/tasks/access-application-cluster/create-external-load-balancer.md (#17124)

* zh-trans replace the wrong translation (#17103)

zh-trans replace the wrong translation

* Merged 1.14~1.16 changes (#17117)

* zh-trans:/docs/concepts/configuration/assign-pod-node.md (#17129)

* update zh trans /docs/contribute/generate-ref-docs/kubernetes-api.md (#17161)

* pr_release-1.16_basic-ss (#17169)

* Add zh-trans of assign-cpu-resource.md (#17063)

Signed-off-by: heqg <he.qingguo@zte.com.cn>

Add zh-trans of assign-cpu-resource.md

Signed-off-by: heqg <he.qingguo@zte.com.cn>

Add zh-trans of assign-cpu-resource.md

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Add zh-trans of assign-cpu-resource.md

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Add zh-trans of assign-cpu-resource.md

Signed-off-by: heqg <he.qingguo@zte.com.cn>

* update zh trans content/zh/docs/concepts/overview/working-with-objects/common-labels.md (#17193)

* update zh translation /docs/contribute/intermediate.md (#17041)

* zh-trans:docs/setup/production-environment/turnkey/tencent.md (#17207)

* pr_release-1.16_mysql-wordpress-pv (#17202)

* pr_release-1.16_reconfig-kubelet (#17200)

* zh-trans:/docs/docs/concepts/workloads/controllers/jobs-run-completio… (#17020)

* zh-trans:/docs/docs/concepts/workloads/controllers/jobs-run-completion.md

* Update jobs-run-completion.md

* Update jobs-run-completion.md

* update zh trans content/zh/docs/concepts/extend-kubernetes/extend-cluster.md (#17212)

* update zh trans content/zh/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md (#17213)

* add zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_kubeconfig.md (#17220)

kubeadm_join_phase_control-plane-prepare_download-certs.md

* add zh trans /reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs.md and /reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare.md (#17219)

* update zh trans content/zh/docs/concepts/containers/images.md (#17216)

* ZH-trans: add _index.md (#17214)

* ZH-trans: add _index.md

* add _index.md file

* add _index.md files

* pr_release-1.16_crd-versions (#17198)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_config_images_pull.md (#17092)

* zh-trans /reference/setup-tools/kubeadm/generated/kubeadm_config_images.md (#17094)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon_kube-proxy.md   and   content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_sa.md (#17222)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_all.md  content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_certs.md (#17221)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon_all.md (#17223)

* 013 /docs/concepts/services networking/ingress.md (#17185)

* x

* update zh trans content/zh/docs/concepts/services-networking/ingress.md

* zh-trans:/reference/setup-tools/kubeadm/generated/kubeadm_completion.md and kubeadm_config.md (#17097)

* add zh trans reference/glossary/pod-lifecycle (#17226)

* update zh-translation document (#17096)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* update zh-translation:setup-ha-etcd-with-kubeadm.md (#17098)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* add zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_selfhosting.md and /docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config_enable-dynamic.md (#17227)

* add zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubeconfig_user.md and /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-config_kubeadm.md (#17228)

* zh-translation:content/zh/docs/tasks/extend-kubectl/kubectl-plugins.md (#17089)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_join.md (#17080)

* update zh translation /reference/setup-tools/kubeadm/generated/kubeadm_config_view.md (#17085)

* zh-translation:troubleshooting-kubeadm.md (#17069)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* zh-trans: docs/concepts/scheduling/kube-scheduler.md (#17067)

* Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

Add Chinese translation for kube-scheduler

Signed-off-by: GeorgeSen <wang.sen2@zte.com.cn>

* Update kube-scheduler.md

* Add Chinese translation for kube-scheduler

* Update kube-scheduler.md

* Update kube-scheduler.md

* Update kube-scheduler.md

* translate pods.md  and init-containers.md for branch release-1.16 (#17208)

* update zh translation /docs/contribute/start.md (#17039)

* zh-translation:2017-10-00-Five-Days-Of-Kubernetes-18.md (#17229)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* translate kubeadm-certs.md (#17090)

* update the Illegal comment such as : (<！--、<--) (#17266)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_etcd-ca.md (#17268)

* update zh /docs/concepts/architecture/cloud-controller.md (#17263)

* update zh /docs/concepts/cluster-administration/logging.md (#17247)

* modify the show of zh translation /concepts/overview/what-is-kubernetes.md /reference/setup-tools/kubeadm/generated/kubeadm_init.md  /reference/setup-tools/kubeadm/kubeadm-init.md (#17246)

* zh-translation:kubeadm_init_phase_control-plane_all.md (#17243)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* zh-translation:kubeadm_join_phase_control-plane-join_etcd.md (#17236)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubelet-start.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-certs.md (#17230)

* add content/zh/docs/reference/glossary/container-runtime.md file fix-up to pass the ci and trans content/zh/docs/reference/glossary/container-runtime.md、content/zh/docs/concepts/overview/components.md (#17211)

* zh-translation:mirror-pod.md (#17231)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* zh-translation:kubeadm_init_phase_upload-config.md (#17238)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* update zh /docs/concepts/workloads/pods/pod-overview.md (#17239)

* update the format of zh translation content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_reset.md content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_upgrade.md   content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_upgrade_apply.md  content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_upgrade_plan.md  content/zh/docs/reference/setup-tools/kubeadm/kubeadm-config.md  content/zh/docs/reference/setup-tools/kubeadm/kubeadm-reset.md  content/zh/docs/reference/setup-tools/kubeadm/kubeadm-token.md  content/zh/docs/reference/setup-tools/kubeadm/kubeadm-upgrade.md (#17248)

* Create advanced.md (#17256)

* Create advanced.md

* trans the advanced.md and fix the build bugs

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_control-plane.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_control-plane_scheduler.md (#17269)

* zh-translation:kubelet-integration.md (#17272)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* pr_release-1.16_out-of-resource (#17199)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_front-proxy-ca.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_control-plane_controller-manager.md (#17267)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_etcd-peer.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubeconfig_admin.md (#17271)

* pr_release-1.16_ext-admission-ctl (#17196)

* update zh translation /docs/contribute/advanced.md (#17042)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_apiserver-etcd-client.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_ca.md (#17275)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_print.md update zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_print_init-defaults.md (#17282)

* add zh trans  content/zh/docs/reference/setup-tools/kubeadm/generated… (#17287)

* add zh trans  content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_etcd.md content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-config_all.md update zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_control-plane.md

* Update kubeadm_init_phase_etcd.md

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/… (#17285)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-server.md content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet.md update zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_apiserver.md

* Update kubeadm_alpha_kubelet.md

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_all.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon.md fix-up bad comment kubeadm_alpha_certs_renew.md、kubeadm_alpha_certs_renew_apiserver-etcd-client.md、kubeadm_init_phase_addon_all.md (#17276)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/… (#17281)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_etcd_local.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_print_join-defaults.md

* Update kubeadm_init_phase_etcd_local.md

* zh trans update-daemon-set.md (#16872)

* zh trans update-daemon-set.md

* Update update-daemon-set.md

* managing-tls-in-a-cluster.md (#16874)

* update-api-object-kubectl-patch.md (#16875)

* improve the zh trans /kubeadm/generated/kubeadm_init_phase_.* 1 (#17295)

* improve the zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_.* (#17294)

* modify the zh translation content/zh/docs/reference/setup-tools/kubea… (#17293)

* modify the zh translation content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_.*

* Update kubeadm_alpha.md

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubeconfig_all.md and content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_preflight.md (#17280)

* add zh /docs/reference/glossary/cgroup.md (#17291)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_apiserver-kubelet-client.md (#17288)

* improve zh trans of command in /kubeadm/generated/kubeadm_init_phase_.* files (#17297)

* improve zh command translation /kubeadm/generated/kubeadm_init_.* files (#17298)

* update zh trans in /kubeadm/generated/kubeadm_.* files (#17306)

* add zh trans /reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-healthcheck-client.md、/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-peer.md、/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubeconfig.md (#17308)

* Improve previously translated documents (#17327)

Signed-off-by: yuxiaobo <yuxiaobogo@163.com>

* zh-trans: docs/setup/production-environment/turnkey/aws.md (#17320)

* Update zh.toml

* update zh trans /generated/kubeadm_join_phase_.* files (#17301)

* Update zh.toml

* add zh /docs/reference/glossary/pod-disruption-budget.md (#17344)

* pr_release-1.16_config-aggregation-layer (#17197)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_controller-manager.conf.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_scheduler.conf.md (#17390)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubeconfig_scheduler.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_control-plane.md (#17381)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_apiserver-kubelet-client.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-join_mark-control-plane.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_kubelet-start.md (#17380)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon_coredns.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_bootstrap-token.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_apiserver.md (#17383)

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Issue available at https://kubernetes.io/zh/docs/concepts/containers/runtime-class/
and introduced by original English documentation (see #17543)

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Co-Authored-By: Qiming <tengqim@cn.ibm.com>

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---
title: 标签和选择器
content_template: templates/concept
weight: 40
---
<!--
---
reviewers:
- mikedanese
title: Labels and Selectors
content_template: templates/concept
weight: 40
---
-->
{{% capture overview %}}
<!--
_Labels_ are key/value pairs that are attached to objects, such as pods.
Labels are intended to be used to specify identifying attributes of objects that are meaningful and relevant to users, but do not directly imply semantics to the core system.
Labels can be used to organize and to select subsets of objects. Labels can be attached to objects at creation time and subsequently added and modified at any time.
Each object can have a set of key/value labels defined. Each Key must be unique for a given object.
-->
_标签_ 是附加到 Kubernetes 对象（比如 Pods）上的键值对。
标签旨在用于指定对用户有意义且相关的对象的标识属性，但不直接对核心系统有语义含义。
标签可以用于组织和选择对象的子集。标签可以在创建时附加到对象，随后可以随时添加和修改。
每个对象都可以定义一组键/值标签。每个键对于给定对象必须是唯一的。
```json
"metadata": {
"labels": {
"key1" : "value1",
"key2" : "value2"
}
}
```
<!--
We'll eventually index and reverse-index labels for efficient queries and watches, use them to sort and group in UIs and CLIs, etc. We don't want to pollute labels with non-identifying, especially large and/or structured, data. Non-identifying information should be recorded using [annotations](/docs/concepts/overview/working-with-objects/annotations/).
-->
我们最终将标签索引和反向索引，用于高效查询和监视，使用它们在 UI 和 CLI 中进行排序和分组等。我们不希望将非标识性的、尤其是大型或结构化数据用作标签，给后者带来污染。应使用 [注解](/docs/concepts/overview/working-with-objects/annotations/) 记录非识别信息
{{% /capture %}}
{{% capture body %}}
<!--
## Motivation
-->
## 动机
<!--
Labels enable users to map their own organizational structures onto system objects in a loosely coupled fashion, without requiring clients to store these mappings.
-->
标签使用户能够以松散耦合的方式将他们自己的组织结构映射到系统对象，而无需客户端存储这些映射。
<!--
Service deployments and batch processing pipelines are often multi-dimensional entities (e.g., multiple partitions or deployments, multiple release tracks, multiple tiers, multiple micro-services per tier). Management often requires cross-cutting operations, which breaks encapsulation of strictly hierarchical representations, especially rigid hierarchies determined by the infrastructure rather than by users.
-->
服务部署和批处理流水线通常是多维实体（例如，多个分区或部署、多个发行序列、多个层，每层多个微服务）。管理通常需要交叉操作，这打破了严格的层次表示的封装，特别是由基础设施而不是用户确定的严格的层次结构。
<!--
Example labels:
-->
示例标签：
* `"release" : "stable"`, `"release" : "canary"`
* `"environment" : "dev"`, `"environment" : "qa"`, `"environment" : "production"`
* `"tier" : "frontend"`, `"tier" : "backend"`, `"tier" : "cache"`
* `"partition" : "customerA"`, `"partition" : "customerB"`
* `"track" : "daily"`, `"track" : "weekly"`
<!--
These are just examples of commonly used labels; you are free to develop your own conventions. Keep in mind that label Key must be unique for a given object.
-->
这些只是常用标签的例子; 您可以任意制定自己的约定。请记住，对于给定对象标签的键必须是唯一的。
<!--
## Syntax and character set
-->
## 语法和字符集
<!--
_Labels_ are key/value pairs. Valid label keys have two segments: an optional prefix and name, separated by a slash (`/`). The name segment is required and must be 63 characters or less, beginning and ending with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between. The prefix is optional. If specified, the prefix must be a DNS subdomain: a series of DNS labels separated by dots (`.`), not longer than 253 characters in total, followed by a slash (`/`).
If the prefix is omitted, the label Key is presumed to be private to the user. Automated system components (e.g. `kube-scheduler`, `kube-controller-manager`, `kube-apiserver`, `kubectl`, or other third-party automation) which add labels to end-user objects must specify a prefix. The `kubernetes.io/` prefix is reserved for Kubernetes core components.
-->
_标签_ 是键值对。有效的标签键有两个段：可选的前缀和名称，用斜杠（`/`）分隔。名称段是必需的，必须小于等于 63 个字符，以字母数字字符（`[a-z0-9A-Z]`）开头和结尾，带有破折号（`-`），下划线（`_`），点（ `.`）和之间的字母数字。前缀是可选的。如果指定，前缀必须是 DNS 子域：由点（`.`）分隔的一系列 DNS 标签，总共不超过 253 个字符，后跟斜杠（`/`）。
如果省略前缀，则假定标签键对用户是私有的。 向最终用户对象添加标签的自动系统组件（例如 `kube-scheduler`，`kube-controller-manager`，`kube-apiserver`，`kubectl` 或其他第三方自动化）必须指定前缀。`kubernetes.io/` 前缀是为 Kubernetes 核心组件保留的。
<!--
Valid label values must be 63 characters or less and must be empty or begin and end with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between.
-->
有效标签值必须为 63 个字符或更少，并且必须为空或以字母数字字符（`[a-z0-9A-Z]`）开头和结尾，中间可以包含破折号（`-`）、下划线（`_`）、点（`.`）和字母或数字。
<!--
## Label selectors
-->
## 标签选择器
<!--
Unlike [names and UIDs](/docs/user-guide/identifiers), labels do not provide uniqueness. In general, we expect many objects to carry the same label(s).
-->
与 [名称和 UID](/docs/user-guide/identifiers) 不同，标签不提供唯一性。通常，我们希望许多对象携带相同的标签。
<!--
Via a _label selector_, the client/user can identify a set of objects. The label selector is the core grouping primitive in Kubernetes.
-->
通过 _标签选择器_，客户端/用户可以识别一组对象。标签选择器是 Kubernetes 中的核心分组原语。
<!--
The API currently supports two types of selectors: _equality-based_ and _set-based_.
A label selector can be made of multiple _requirements_ which are comma-separated. In the case of multiple requirements, all must be satisfied so the comma separator acts as a logical _AND_ (`&&`) operator.
-->
API 目前支持两种类型的选择器：_基于相等性的_ 和 _基于集合的_。
标签选择器可以由逗号分隔的多个 _需求_ 组成。在多个需求的情况下，必须满足所有要求，因此逗号分隔符充当逻辑 _与_（`&&`）运算符。
<!--
An empty label selector (that is, one with zero requirements) selects every object in the collection.
-->
空标签选择器（即，需求为零的选择器）选择集合中的每个对象。
<!--
A null label selector (which is only possible for optional selector fields) selects no objects.
-->
null 值的标签选择器（仅可用于可选选择器字段）不选择任何对象
{{< note >}}
<!--
**Note**: the label selectors of two controllers must not overlap within a namespace, otherwise they will fight with each other.
-->
**注意**：两个控制器的标签选择器不得在命名空间内重叠，否则它们将互相冲突。
{{< /note >}}
<!--
### _Equality-based_ requirement
-->
### _基于相等性的_ 需求
<!--
_Equality-_ or _inequality-based_ requirements allow filtering by label keys and values. Matching objects must satisfy all of the specified label constraints, though they may have additional labels as well.
Three kinds of operators are admitted `=`,`==`,`!=`. The first two represent _equality_ (and are simply synonyms), while the latter represents _inequality_. For example:
-->
_基于相等性_ 或 _不相等_ 的需求允许按标签键和值进行过滤。匹配对象必须满足所有指定的标签约束，尽管它们也可能具有其他标签。
可接受的运算符有`=`、`==` 和 `！=` 三种。 前两个表示 _相等_（并且只是同义词），而后者表示 _不相等_。 例如：
```
environment = production
tier != frontend
```
<!--
The former selects all resources with key equal to `environment` and value equal to `production`.
The latter selects all resources with key equal to `tier` and value distinct from `frontend`, and all resources with no labels with the `tier` key.
One could filter for resources in `production` excluding `frontend` using the comma operator: `environment=production,tier!=frontend`
-->
前者选择所有资源，其键名等于 `environment`，值等于 `production`。
后者选择所有资源，其键名等于 `tier`，值不同于 `frontend`，所有资源都没有带有 `tier` 键的标签。
可以使用逗号运算符来过滤 `production` 环境中的非 `frontend` 层资源：`environment=production,tier!=frontend`。
<!--
One usage scenario for equality-based label requirement is for Pods to specify
node selection criteria. For example, the sample Pod below selects nodes with
the label "`accelerator=nvidia-tesla-p100`".
-->
基于相等性的标签要求的一种使用场景是 Pods 要指定节点选择标准。例如，下面的示例 Pod 选择带有标签 "`accelerator=nvidia-tesla-p100`"。
```yaml
apiVersion: v1
kind: Pod
metadata:
name: cuda-test
spec:
containers:
- name: cuda-test
image: "k8s.gcr.io/cuda-vector-add:v0.1"
resources:
limits:
nvidia.com/gpu: 1
nodeSelector:
accelerator: nvidia-tesla-p100
```
<!--
### _Set-based_ requirement
-->
### _基于集合_ 的需求
<!--
_Set-based_ label requirements allow filtering keys according to a set of values. Three kinds of operators are supported: `in`,`notin` and `exists` (only the key identifier). For example:
-->
_基于集合_ 的标签需求允许您通过一组值来过滤键。支持三种操作符：`in`,`notin` and `exists` (只可以用在键标识符上)。例如：
```
environment in (production, qa)
tier notin (frontend, backend)
partition
!partition
```
<!--
The first example selects all resources with key equal to `environment` and value equal to `production` or `qa`.
-->
第一个示例选择了所有键等于 `environment` 并且值等于 `production` 或者 `qa` 的资源。
<!--
The second example selects all resources with key equal to `tier` and values other than `frontend` and `backend`, and all resources with no labels with the `tier` key.
-->
第二个示例选择了所有键等于 `tier` 并且值不等于 `frontend` 或者 `backend` 的资源，以及所有没有 `tier` 键标签的资源。
<!--
The third example selects all resources including a label with key `partition`; no values are checked.
--->
第三个示例选择了所有包含了有 `partition` 标签的资源；没有校验它的值。
<!--
The fourth example selects all resources without a label with key `partition`; no values are checked.
-->
第三个示例选择了所有没有 `partition` 标签的资源；没有校验它的值。
<!--
Similarly the comma separator acts as an _AND_ operator. So filtering resources with a `partition` key (no matter the value) and with `environment` different than  `qa` can be achieved using `partition,environment notin (qa)`.
-->
类似地，逗号分隔符充当 _AND_ 运算符。因此，使用 `partition` 键（无论为何值）和 `environment` 不同于 `qa` 来过滤资源可以使用 `partition，environment notin（qa)` 来实现。
<!--
The _set-based_ label selector is a general form of equality since `environment=production` is equivalent to `environment in (production)`; similarly for `!=` and `notin`.
-->
_基于集合_ 的标签选择器是相等标签选择器的一般形式，因为 `environment = production` 等同于 `environment in（production）`;`！=` 和 `notin` 也是类似的。
<!--
_Set-based_ requirements can be mixed with _equality-based_ requirements. For example: `partition in (customerA, customerB),environment!=qa`.
-->
_基于集合_ 的要求可以与基于 _相等_ 的要求混合使用。例如：`partition in (customerA, customerB),environment!=qa`。
## API
<!--
### LIST and WATCH filtering
-->
### LIST 和 WATCH 过滤
<!--
LIST and WATCH operations may specify label selectors to filter the sets of objects returned using a query parameter. Both requirements are permitted (presented here as they would appear in a URL query string):
-->
LIST and WATCH 操作可以使用查询参数指定标签选择器过滤一组对象。两种需求都是允许的。（这里显示的是它们出现在 URL 查询字符串中）
<!--
* _equality-based_ requirements: `?labelSelector=environment%3Dproduction,tier%3Dfrontend`
* _set-based_ requirements: `?labelSelector=environment+in+%28production%2Cqa%29%2Ctier+in+%28frontend%29`
-->
* _基于相等性_ 的需求: `?labelSelector=environment%3Dproduction,tier%3Dfrontend`
* _基于集合_ 的需求: `?labelSelector=environment+in+%28production%2Cqa%29%2Ctier+in+%28frontend%29`
<!--
Both label selector styles can be used to list or watch resources via a REST client. For example, targeting `apiserver` with `kubectl` and using _equality-based_ one may write:
-->
两种标签选择器都可以通过 REST 客户端用于 list 或者 watch 资源。例如，使用 `kubectl` 定位 `apiserver`，可以使用 _基于相等性_ 的标签选择器可以这么写：
```shell
$ kubectl get pods -l environment=production,tier=frontend
```
<!--
or using _set-based_ requirements:
-->
或者使用 _基于集合的_ 需求：
```shell
$ kubectl get pods -l 'environment in (production),tier in (frontend)'
```
<!--
As already mentioned _set-based_ requirements are more expressive.  For instance, they can implement the _OR_ operator on values:
-->
正如刚才提到的，_基于集合_ 的需求更具有表达力。例如，它们可以实现值的 _或_ 操作：
```shell
$ kubectl get pods -l 'environment in (production, qa)'
```
<!--
or restricting negative matching via _exists_ operator:
-->
或者通过 _exists_ 运算符限制不匹配：
```shell
$ kubectl get pods -l 'environment,environment notin (frontend)'
```
<!--
### Set references in API objects
Some Kubernetes objects, such as [`services`](/docs/user-guide/services) and [`replicationcontrollers`](/docs/user-guide/replication-controller), also use label selectors to specify sets of other resources, such as [pods](/docs/user-guide/pods).
-->
### 在 API 对象上设置引用
一些 Kubernetes 对象，例如 [`services`](/docs/user-guide/services) 和 [`replicationcontrollers`](/docs/user-guide/replication-controller) ，也使用了标签选择器去指定了其他资源的集合，例如 [pods](/docs/user-guide/pods)。
<!--
#### Service and ReplicationController
The set of pods that a `service` targets is defined with a label selector. Similarly, the population of pods that a `replicationcontroller` should manage is also defined with a label selector.
Labels selectors for both objects are defined in `json` or `yaml` files using maps, and only _equality-based_ requirement selectors are supported:
-->
#### Service 和 ReplicationController
一个 `Service` 指向的一组 pods 是由标签选择器定义的。同样，一个 `ReplicationController` 应该管理的 pods 的数量也是由标签选择器定义的。
两个对象的标签选择器都是在 `json` 或者 `yaml` 文件中使用映射定义的，并且只支持 _基于相等性_ 需求的选择器：
```json
"selector": {
"component" : "redis",
}
```
<!--
or
-->
或者
```yaml
selector:
component: redis
```
<!---
this selector (respectively in `json` or `yaml` format) is equivalent to `component=redis` or `component in (redis)`.
-->
这个选择器(分别在 `json` 或者 `yaml` 格式中) 等价于 `component=redis` 或 `component in (redis)` 。
<!--
#### Resources that support set-based requirements
Newer resources, such as [`Job`](/docs/concepts/jobs/run-to-completion-finite-workloads/), [`Deployment`](/docs/concepts/workloads/controllers/deployment/), [`Replica Set`](/docs/concepts/workloads/controllers/replicaset/), and [`Daemon Set`](/docs/concepts/workloads/controllers/daemonset/), support _set-based_ requirements as well.
-->
#### 支持基于集合需求的资源
比较新的资源，例如 [`Job`](/docs/concepts/jobs/run-to-completion-finite-workloads/)、[`Deployment`](/docs/concepts/workloads/controllers/deployment/)、[`Replica Set`](/docs/concepts/workloads/controllers/replicaset/) 和[`Daemon Set`](/docs/concepts/workloads/controllers/daemonset/) ,也支持 _基于集合的_ 需求。
```yaml
selector:
matchLabels:
component: redis
matchExpressions:
- {key: tier, operator: In, values: [cache]}
- {key: environment, operator: NotIn, values: [dev]}
```
<!--
`matchLabels` is a map of `{key,value}` pairs. A single `{key,value}` in the `matchLabels` map is equivalent to an element of `matchExpressions`, whose `key` field is "key", the `operator` is "In", and the `values` array contains only "value". `matchExpressions` is a list of pod selector requirements. Valid operators include In, NotIn, Exists, and DoesNotExist. The values set must be non-empty in the case of In and NotIn. All of the requirements, from both `matchLabels` and `matchExpressions` are ANDed together -- they must all be satisfied in order to match.
-->
`matchLabels` 是由 `{key，value}` 对组成的映射。`matchLabels` 映射中的单个 `{key，value }` 等同于 `matchExpressions` 的元素，其 `key`字段为 "key"，`operator` 为 "In"，而 `values` 数组仅包含 "value"。`matchExpressions` 是 pod 选择器要求的列表。有效的运算符包括 In，NotIn，Exists 和 DoesNotExist。在 In 和 NotIn 的情况下，设置的值必须是非空的。来自 `matchLabels` 和 `matchExpressions` 的所有要求都是合在一起 -- 它们必须都满足才能匹配。
<!--
#### Selecting sets of nodes
-->
#### 选择节点集
<!--
One use case for selecting over labels is to constrain the set of nodes onto which a pod can schedule.
See the documentation on [node selection](/docs/concepts/configuration/assign-pod-node/) for more information.
-->
通过标签进行选择的一个用例是确定节点集，方便 pod 调度。
有关更多信息，请参阅 [选择节点](/docs/concepts/configuration/assign-pod-node/) 上的文档。
{{% /capture %}}