diff --git a/.vuepress/config.js b/.vuepress/config.js index 740a95e..437bb39 100644 --- a/.vuepress/config.js +++ b/.vuepress/config.js @@ -491,6 +491,7 @@ module.exports = { children: [ 'k8s-advanced/policy/rq', 'k8s-advanced/policy/rq_types', + 'k8s-advanced/policy/rq_scope', ] }, ] diff --git a/.vuepress/public/statics/learning/policy/rq-scope-high-priority-pod.yaml b/.vuepress/public/statics/learning/policy/rq-scope-high-priority-pod.yaml new file mode 100644 index 0000000..b2731ad --- /dev/null +++ b/.vuepress/public/statics/learning/policy/rq-scope-high-priority-pod.yaml @@ -0,0 +1,18 @@ +apiVersion: v1 +kind: Pod +metadata: + name: high-priority +spec: + containers: + - name: high-priority + image: ubuntu + command: ["/bin/sh"] + args: ["-c", "while true; do echo hello; sleep 10;done"] + resources: + requests: + memory: "10Gi" + cpu: "500m" + limits: + memory: "10Gi" + cpu: "500m" + priorityClassName: high diff --git a/.vuepress/public/statics/learning/policy/rq-scope-quota.yaml b/.vuepress/public/statics/learning/policy/rq-scope-quota.yaml new file mode 100644 index 0000000..83bff90 --- /dev/null +++ b/.vuepress/public/statics/learning/policy/rq-scope-quota.yaml @@ -0,0 +1,45 @@ +apiVersion: v1 +kind: List +items: +- apiVersion: v1 + kind: ResourceQuota + metadata: + name: pods-high + spec: + hard: + cpu: "1000" + memory: 200Gi + pods: "10" + scopeSelector: + matchExpressions: + - operator : In + scopeName: PriorityClass + values: ["high"] +- apiVersion: v1 + kind: ResourceQuota + metadata: + name: pods-medium + spec: + hard: + cpu: "10" + memory: 20Gi + pods: "10" + scopeSelector: + matchExpressions: + - operator : In + scopeName: PriorityClass + values: ["medium"] +- apiVersion: v1 + kind: ResourceQuota + metadata: + name: pods-low + spec: + hard: + cpu: "5" + memory: 10Gi + pods: "10" + scopeSelector: + matchExpressions: + - operator : In + scopeName: PriorityClass + values: ["low"] diff --git a/learning/k8s-advanced/policy/lr.md b/learning/k8s-advanced/policy/lr.md index b817897..be27c44 100644 --- a/learning/k8s-advanced/policy/lr.md +++ b/learning/k8s-advanced/policy/lr.md @@ -5,7 +5,7 @@ layout: LearningLayout description: Kubernetes教程_默认情况下_容器在 Kubernetes 集群上运行时_不受计算资源的限制_使用Resourcequota集群管理员可以针对名称空间限定资源的使用情况 meta: - name: keywords - content: Kubernetes + content: Kubernetes教程, LimitRange, Kubernetes Limit Range --- # 概述 diff --git a/learning/k8s-advanced/policy/lr_container.md b/learning/k8s-advanced/policy/lr_container.md index a5760f0..f8dda01 100644 --- a/learning/k8s-advanced/policy/lr_container.md +++ b/learning/k8s-advanced/policy/lr_container.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_本文讨论了如何在容器级别创建 LimitRange。假设有一个 Pod 包含 4个容器，每个容器都定义了 spec.resource，此时 LimitRanger 管理控制器在处理该 Pod 中的 4个容器是，处理方式是不一样的。 meta: - name: keywords - content: Kubernetes + content: Kubernetes教程, LimitRange, Kubernetes Limit Range --- # 限定容器的计算资源 diff --git a/learning/k8s-advanced/policy/lr_pod.md b/learning/k8s-advanced/policy/lr_pod.md index 6bc3089..79e53c1 100644 --- a/learning/k8s-advanced/policy/lr_pod.md +++ b/learning/k8s-advanced/policy/lr_pod.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_本文讨论了如何使用LimitRange_在Pod级别限定资源的使用_下面是一个用于限定Pod资源使用的LimitRange对象。 meta: - name: keywords - content: Kubernetes + content: Kubernetes教程, LimitRange, Kubernetes Limit Range --- # 限定Pod的计算资源 diff --git a/learning/k8s-advanced/policy/lr_ratio.md b/learning/k8s-advanced/policy/lr_ratio.md index 3d399e0..3429ed2 100644 --- a/learning/k8s-advanced/policy/lr_ratio.md +++ b/learning/k8s-advanced/policy/lr_ratio.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_本文讨论了如何使用LimitRange在名称空间中限制Limits/Requests的比例_如果指定了LimitRange对象的spec.limits.maxLimitRequestRatio字段_名称空间中的Pod/容器的request和limit都不能为0_且limit除以request的结果必须小于或等于LimitRange的spec.limits.maxLimitRequestRatio meta: - name: keywords - content: Kubernetes + content: Kubernetes教程, LimitRange, Kubernetes Limit Range --- # 限定 Limit/Request 比例 diff --git a/learning/k8s-advanced/policy/lr_storage.md b/learning/k8s-advanced/policy/lr_storage.md index 63024d1..0c5ee71 100644 --- a/learning/k8s-advanced/policy/lr_storage.md +++ b/learning/k8s-advanced/policy/lr_storage.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_本文讨论了如何使用LimitRange_名称空间中限制存储资源的使用_通过LimitRange对象_集群管理员可以限定名称空间中每个PersistentVolumeClaim存储卷声明可以使用的最小最大存储空间 meta: - name: keywords - content: Kubernetes + content: Kubernetes教程, LimitRange, Kubernetes Limit Range --- # 限定存储资源 diff --git a/learning/k8s-advanced/policy/rq.md b/learning/k8s-advanced/policy/rq.md index 3d8f281..4a04146 100644 --- a/learning/k8s-advanced/policy/rq.md +++ b/learning/k8s-advanced/policy/rq.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_当多个用户或团队共享一个节点数量有限的集群时_如何在多个用户或团队之间分配集群的资源就会变得非常重要_Resource_quota的用途便在于此 meta: - name: keywords - content: Kubernetes + content: Kubernetes 教程,Resource Quota,ResourceQuota --- # 概述 diff --git a/learning/k8s-advanced/policy/rq_scope.md b/learning/k8s-advanced/policy/rq_scope.md new file mode 100644 index 0000000..f4241ab --- /dev/null +++ b/learning/k8s-advanced/policy/rq_scope.md @@ -0,0 +1,151 @@ +--- +vssueId: 144 +layout: LearningLayout +description: Kubernetes教程_当多个用户或团队共享一个节点数量有限的集群时_如何在多个用户或团队之间分配集群的资源就会变得非常重要_Resource_quota的用途便在于此_本文探索了可以通过ResourceQuota限定名称空间资源配额时的作用域 +meta: + - name: keywords + content: K8S 教程,Resource Quota,ResourceQuota +--- + +# 作用域 + +## 按Scope设定ResourceQuota + + + +> 参考文档：[Resource Quota](https://kubernetes.io/docs/concepts/policy/resource-quotas/) + +当多个用户（团队）共享一个节点数量有限的集群时，如何在多个用户（团队）之间分配集群的资源就会变得非常重要。Resource quota 的用途便在于此。本文主要探索通过 ResourceQuota 限定名称空间资源配额时的作用域。 + +每个 ResourceQuota 对象都可以绑定一组作用域，当 Kubernetes 对象与此 ResourceQuota 的作用域匹配（在作用域中）时，ResourceQuota 的限定才对该对象生效。 + + + + + +| Scope（作用域） | 描述 | +| --------------- | ------------------------------------------------------------ | +| Terminating | 包含所有 `.spec.activeDeadlineSeconds >= 0 ` 的 Pod | +| NotTerminating | 包含所有 `.spec.activeDeadlineSeconds is nil` 的Pod | +| BestEffort | 包含所有服务等级（quality of service）为 BestEffort 的 Pod | +| NotBestEffort | 包含所有服务等级（quality of service）为 NotBestEffort 的 Pod | + +* 带有 `BestEffort` 作用域的 ResourceQuota 关注点为: `Pod` +* 带有 `Terminating`、` NotTerminating`、 `NotBestEffort` 的作用域关注点为： + * `cpu` + * `limits.cpu` + * `limits.memory` + * `memory` + * `pods` + * `requests.cpu` + * `requests.memory` + +## 按PriorityClass设定ResourceQuota + +**FEATURE STATE** `Kubernetes 1.12` beta + +创建 Pod 时，可以指定 [priority](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#pod-priority)。使用 ResourceQuota 的 `.spec.scopeSelector` 字段将 ResourceQuota 和 Pod 的 priority 关联，进而限定 Pod 的资源消耗。 + + + +只有当 ResourceQuota 的 `.spec.scopeSelector` 字段与 Pod 的 priorty 字段匹配时，ResourceQuota 才生效。 + +下面的例子创建了一个通过 priority 限定特定 Pod 的 ResourceQuota 对象，该例子的工作方式如下： +* 假设集群中的 Pod 可以被指定三种 priority class： `low`、`medium`、`high` +* 集群中为每个 Priority 都创建了一个 ResourceQuota 对象 + +定义 ResourceQuota 对象的文件如下所示： + +<<< @/.vuepress/public/statics/learning/policy/rq-scope-quota.yaml + +执行命令以创建 ResourceQuota： +``` sh +kubectl create -f https://kuboard.cn/statics/learning/policy/rq-scope-quota.yaml +``` +输出结果如下所示 +``` +resourcequota/pods-high created +resourcequota/pods-medium created +resourcequota/pods-low created +``` +执行如下命令验证 quota 的使用为 `0`： +```sh +kubectl describe quota +``` +输出结果如下所示： +``` +Name: pods-high +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 0 1k +memory 0 200Gi +pods 0 10 + + +Name: pods-low +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 0 5 +memory 0 10Gi +pods 0 10 + + +Name: pods-medium +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 0 10 +memory 0 20Gi +pods 0 10 +``` +创建 “high” priority Pod，YAML 文件如下所示： + +<<< @/.vuepress/public/statics/learning/policy/rq-scope-high-priority-pod.yaml + +执行命令以创建 +```sh +kubectl create -f https://kuboard.cn/statics/learning/policy/rq-scope-high-priority-pod.yaml +``` + +验证 "high" priority 对应的 ResourceQuota `pods-high` 的 `Used` 统计结果，可以发现 `pods-heigh` 的配额已经被使用，而其他两个的配额则没有被使用。 + +执行命令 +``` sh +kubectl describe quota +``` +输出结果如下所示： +``` +Name: pods-high +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 500m 1k +memory 10Gi 200Gi +pods 1 10 + + +Name: pods-low +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 0 5 +memory 0 10Gi +pods 0 10 + + +Name: pods-medium +Namespace: default +Resource Used Hard +-------- ---- ---- +cpu 0 10 +memory 0 20Gi +pods 0 10 +``` + +`scopeSelector.matchExpressions.operator` 字段中，可以使用如下几种取值： +* In +* NotIn +* Exist +* DoesNotExist diff --git a/learning/k8s-advanced/policy/rq_types.md b/learning/k8s-advanced/policy/rq_types.md index 30ec0ed..641831c 100644 --- a/learning/k8s-advanced/policy/rq_types.md +++ b/learning/k8s-advanced/policy/rq_types.md @@ -4,7 +4,7 @@ layout: LearningLayout description: Kubernetes教程_当多个用户或团队共享一个节点数量有限的集群时_如何在多个用户或团队之间分配集群的资源就会变得非常重要_Resource_quota的用途便在于此_本文探索了可以通过ResourceQuota限定的资源类型。 meta: - name: keywords - content: Kubernetes + content: K8S 教程,Resource Quota,ResourceQuota --- # 资源类型