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e6f5450dee4c930d2b78132b4eb4050f8f08a2da
kuboard-press/docs/assets/js/8.b3f9cb6b.js
huanqing.shao e6f5450dee k8s-core-concepts
2019-07-31 10:46:33 +08:00

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"),s("p",[s("img",{attrs:{src:r(341),alt:"image-20190722165648180"}})]),e._v(" "),s("p",[e._v("上图中各概念与 Kuboard 工作负载编辑器界面的映射关系如下：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(342),alt:"image-20190722162249531"}})]),e._v(" "),s("h3",{attrs:{id:"_1-基本信息"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_1-基本信息","aria-hidden":"true"}},[e._v("#")]),e._v(" 1. 基本信息")]),e._v(" "),s("p",[e._v("基本信息对应到 Kubernetes 的 Workload Controller，当前 Kuboard 工作负载编辑器已经支持了使用频率最高的几类 Workload Controller ：")]),e._v(" "),s("ul",[s("li",[e._v("Deployment")]),e._v(" "),s("li",[e._v("StatefulSet")]),e._v(" "),s("li",[e._v("DaemonSet")])]),e._v(" "),s("blockquote",[s("p",[e._v("Kuboard 将陆续支持其他低频使用的 Controller: Garbage Collection, TTL Controller, Jobs, Cron Job。")])]),e._v(" "),s("p",[e._v("Kubernetes Workload Controller 主要用于：")]),e._v(" "),s("ul",[s("li",[e._v("根据容器组模板的定义，创建和管理多个容器组")]),e._v(" "),s("li",[e._v("处理容器组的复制和上线")]),e._v(" "),s("li",[e._v("在集群范围内提供自修复能力")])]),e._v(" "),s("blockquote",[s("p",[e._v("例如：Workload Controller 起初在节点 A 上创建并运行了一个容器组 pod_a，当节点 A 出现故障不能正常工作时，Workload Controller 可以自动地在其他可用的节点上运行一个完全相同的容器组实例 pod_a' 以替代 pod_a。")]),e._v(" "),s("p",[e._v("不同类型的 Workload Controller 在处理容器组时，会有各自不同的行为。")])]),e._v(" "),s("blockquote",[s("p",[e._v("请参考 https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/#pods-and-controllers")])]),e._v(" "),s("p",[e._v("基本信息编辑器的界面如下图所示：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(343),alt:"image-20190722172356943"}})]),e._v(" "),s("table",[s("thead",[s("tr",[s("th",[e._v("字段名称")]),e._v(" "),s("th",[e._v("字段描述")])])]),e._v(" "),s("tbody",[s("tr",[s("td",[e._v("服务类型")]),e._v(" "),s("td",[e._v("即工作负载类型，"),s("br"),e._v("当前支持： Deployment、StatefulSet、DaemonSet")])]),e._v(" "),s("tr",[s("td",[e._v("服务分层")]),e._v(" "),s("td",[e._v("决定了 Kuboard 将该工作负载展示在哪一个分层，同时，也确定了该工作负载名称的前缀，可选项有："),s("br"),e._v("* 展现层 web、网关层 gateway、服务层 svc、持久层 db、中间件层 cloud、监控层 monitor；"),s("br"),e._v("* 默认层当前不可选择")])]),e._v(" "),s("tr",[s("td",[e._v("标签")]),e._v(" "),s("td",[e._v("用于确定 Service 的 labelSelector、Controller 的 labels、容器组的 labels")])]),e._v(" "),s("tr",[s("td",[e._v("服务描述")]),e._v(" "),s("td",[e._v("展示在 Kuboard 界面上的一段描述信息")])]),e._v(" "),s("tr",[s("td",[e._v("副本数量")]),e._v(" "),s("td",[e._v("对于 Deployment 和 StatefulSet 可以填写，决定了该控制器应该维持的容器组副本的数量")])])])]),e._v(" "),s("h3",{attrs:{id:"_2-数据卷"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_2-数据卷","aria-hidden":"true"}},[e._v("#")]),e._v(" 2. 数据卷")]),e._v(" "),s("p",[e._v("​\t\t容器每次启动时，从镜像中初始化所有文件，后续对文件系统的修改、新增、删除操作的结果都是不能持久化的。当容器崩溃时， kubelet 重启该容器，但是原容器已经做的修改将丢失，因为每次启动容器，都是从镜像中初始化；此外，多个容器运行在同一个容器组中时，通常伴随着在不同容器之间共享文件的需求。")]),e._v(" "),s("p",[e._v("​\t\tKubernetes的抽象出了数据卷 Volume 的概念，以解决上述的问题。")]),e._v(" "),s("p",[e._v("​\t\t"),s("strong",[e._v("Kuboard 目前支持如下类型的数据卷：")])]),e._v(" "),s("ul",[s("li",[e._v("NFS")]),e._v(" "),s("li",[e._v("存储卷声明")]),e._v(" "),s("li",[e._v("emptyDir")]),e._v(" "),s("li",[e._v("配置 ConfigMap")]),e._v(" "),s("li",[e._v("Secrets")])]),e._v(" "),s("blockquote",[s("p",[e._v("Kubernetes 支持的数据卷类型，请参考：https://kubernetes.io/docs/concepts/storage/volumes/#types-of-volumes")]),e._v(" "),s("p",[e._v("Kuboard 认为当前支持的数据卷类型已经满足绝大多数应用场景，目前正在添加对更多类型数据卷的支持。")])]),e._v(" "),s("p",[e._v("​\t\t容器组中的不同容器都可以通过挂载点引用该容器组加载的数据卷。Kuboard 工作负载编辑中，使用如下界面定义数据卷：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(344),alt:"image-20190722182005060"}})]),e._v(" "),s("table",[s("thead",[s("tr",[s("th",[e._v("字段名称")]),e._v(" "),s("th",[e._v("说明")])])]),e._v(" "),s("tbody",[s("tr",[s("td",[e._v("数据卷名称")]),e._v(" "),s("td",[e._v("如图中的 "),s("em",[s("strong",[e._v("example-data")])]),e._v(" 、 "),s("em",[s("strong",[e._v("empty-dir")])])])]),e._v(" "),s("tr",[s("td",[e._v("数据卷类型")]),e._v(" "),s("td")]),e._v(" "),s("tr",[s("td",[e._v("数据卷详细信息")]),e._v(" "),s("td",[e._v("不同类型的数据卷需要填写的信息不尽相同，例如"),s("br"),e._v("存储卷声明，需要选择事先已经在名称空间中创建好的存储卷声明"),s("br"),e._v("NFS，需要填写 NFS Server 的地址，以及 NFS Path")])])])]),e._v(" "),s("h3",{attrs:{id:"_3-身份信息"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_3-身份信息","aria-hidden":"true"}},[e._v("#")]),e._v(" 3. 身份信息")]),e._v(" "),s("p",[e._v("身份信息区域主要为容器组定义两类信息：")]),e._v(" "),s("ul",[s("li",[e._v("imagePullSecrets，容器组调用镜像仓库接口抓取镜像时所使用的用户名密码。如果您使用了私有镜像仓库，您需要在此指定镜像仓库的用户名密码；如果您使用 docker 公共仓库，则无需填写 imagePullSecrets")]),e._v(" "),s("li",[e._v("ServiceAccount，容器组调用 kubernetes apiserver 时，所使用的身份信息")])]),e._v(" "),s("p",[e._v("Kuboard 工作负载编辑器中关于身份信息的编辑界面如下所示：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(345),alt:"image-20190722183329825"}})]),e._v(" "),s("h3",{attrs:{id:"_4-容器"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_4-容器","aria-hidden":"true"}},[e._v("#")]),e._v(" 4. 容器")]),e._v(" "),s("p",[e._v("容器是我们真正应用程序镜像被加载和运行的地方，按照 Kubernetes 的设计，一个容器组 Pod 中可以包含多个容器 Container，这些容器被分为两类：")]),e._v(" "),s("ul",[s("li",[e._v("初始化容器\n"),s("ul",[s("li",[e._v("初始化容器总是执行后结束执行")]),e._v(" "),s("li",[e._v("初始化容器按其定义的顺序执行，前一个初始化容器执行结束后，才开始后一个初始化容器的执行")]),e._v(" "),s("li",[e._v("只有初始化容器执行成功后，容器组才启动工作容器")]),e._v(" "),s("li",[e._v("请参考 https://kubernetes.io/docs/concepts/workloads/pods/init-containers/")])])]),e._v(" "),s("li",[e._v("工作容器\n"),s("ul",[s("li",[e._v("容器组可以包含一个或多个工作容器")]),e._v(" "),s("li",[e._v("https://kubernetes.io/docs/concepts/workloads/pods/pod-overview")])])])]),e._v(" "),s("p",[e._v("Kuborad中，定义容器的界面如下图所示：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(346),alt:"image-20190722183750444"}})]),e._v(" "),s("p",[s("img",{attrs:{src:r(347),alt:"image-20190722184516447"}})]),e._v(" "),s("h3",{attrs:{id:"_5-访问方式"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_5-访问方式","aria-hidden":"true"}},[e._v("#")]),e._v(" 5. 访问方式")]),e._v(" "),s("p",[e._v("​\t\t访问方式，即 Kubernetes Service。")]),e._v(" "),s("blockquote",[s("p",[e._v("请参考： https://kubernetes.io/docs/concepts/services-networking/service/")])]),e._v(" "),s("p",[e._v("​\t\tKuboard 中，支持 ClusterIP（集群内访问） 以及 NodePort（VPC 内访问） 两种 Service 访问方式，您也可以不为该工作负载定义 Service 访问方式。访问方式的界面如下所示：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(348),alt:"image-20190722184943431"}})]),e._v(" "),s("h3",{attrs:{id:"_6-互联网入口"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_6-互联网入口","aria-hidden":"true"}},[e._v("#")]),e._v(" 6. 互联网入口")]),e._v(" "),s("p",[e._v("​\t\t互联网入口，即 Kubernetes Ingress。")]),e._v(" "),s("blockquote",[s("p",[e._v("请参考： https://kubernetes.io/docs/concepts/services-networking/ingress/")])]),e._v(" "),s("p",[e._v("​\t\tKuboard 并不限定您使用何种类型的 "),s("a",{attrs:{href:"https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/",target:"_blank",rel:"noopener noreferrer"}},[e._v("Ingress Controller"),s("OutboundLink")],1),e._v("， 但是 "),s("a",{attrs:{href:"/install/install-k8s"}},[e._v("安装 Kubernetes 用于测试")]),e._v(" 文档中，推荐使用的 Ingress Controller 是 "),s("a",{attrs:{href:"https://github.com/nginxinc/kubernetes-ingress",target:"_blank",rel:"noopener noreferrer"}},[e._v("Nginx-Ingress"),s("OutboundLink")],1),e._v("。")]),e._v(" "),s("p",[e._v("​\t\t在您使用 Nginx-Ingress 的情况下，要想确保您能按照互联网入口中定义的域名访问您的服务，请确保以下两点：")]),e._v(" "),s("ul",[s("li",[e._v("域名解析指向 Kubernetes 集群中 Worker 节点对应的负载均衡的 IP 地址\n"),s("ul",[s("li",[e._v("如果是测试环境，也可以只指向其中一台 Worker 节点的 IP 地址")])])]),e._v(" "),s("li",[e._v("通过该域名，可以访问 Worker 节点的 80 端口\n"),s("ul",[s("li",[e._v("如果您启用了 HTTPS，请同时确保通过该域名可以访问 Worker 节点的 443 端口")])])])]),e._v(" "),s("p",[e._v("​\t\tKuboard 中，定义互联网入口的界面如下所示：")]),e._v(" "),s("p",[s("img",{attrs:{src:r(349),alt:"image-20190722185113938"}})])])},[],!1,null,null,null);t.default=v.exports}}]);
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