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# Desgin | ||
koffloader 是一个将多个集群网络进行连通的组件,将多个 cilium 集群或 submariner 集群的网络进行打通,并将按照需求将多集群内的 service 进行暴露,以达到应用跨多个集群的网络负载功能。 | ||
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koffloader 可以单独运行在多集群的管理集群上,也可以运行在组网集群中的一个子集群中。 | ||
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# 架构 | ||
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<div style="text-align:center"> | ||
<img src="../images/arch.png" alt="Your Image Description"> | ||
</div> | ||
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* koffloader crd 资源: | ||
* KCluster:集群信息配置,用于存放集群信息,管理多个集群。 | ||
* ServiceExportPolicy:服务暴露策略,用于配置多集群内的 service 的暴露方式。 | ||
* KClusterGroup:多集群组网配置,将多个 KCluster 集群组成一个网络。 | ||
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# 功能 | ||
1. 多集群连通:将多个 cilium 集群或 submariner 集群进行组网。 | ||
* cilium: | ||
* 用户需要将需要组网的集群部署好 cilium,然后将集群的信息配置到 KCluster 资源中。 | ||
* 将需要组网 KCluster 资源,引用到 KClusterGroup 中,koffloader 通过 watch KClusterGroup,将各个集群组网,开启 clustermesh 功能。 | ||
* submariner: | ||
* 用户需要将需要组网的集群部署好 submariner,然后将集群的信息配置到 KCluster 资源中。 | ||
* 将需要组网 KCluster 资源,引用到 KClusterGroup 中,因在部署 submariner 时,多集群的网络已经组成,koffloader 不会再进行组网操作。 | ||
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2. 多集群 service 暴露:将子集群的 service 暴露给其他子集群,供其他子集群访问,并带有负载功能。cilium 集群与 submariner 集群对于服务暴露的方式不同,因此,存在以下功能。 | ||
* cilium: | ||
* a. 可通过 global 开关,管理 service 是否被暴露给组网集群,该 service 可以在各个子集群中可以被访问。 | ||
* a. 在开启 global 开关后,可通过 share 开关,管理 service 是否可以被其他子集群访问,此开关意义为当前集群可以访问其他子集群 service,但其他子集群不可以访问当前集群。 | ||
* b. 可通过 servicer affinity 管理 service 负载优先级,分别为 remote 优先负载远端、local 优先负载本地、none 轮巡方式负载。 | ||
* submariner: | ||
* a. 只有一种负载优先级,轮巡负载。 | ||
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3. 多集群流量调度:当外部流量进入到集群 service 后,将各集群的南北向流量打通,并进行负载均衡。 | ||
* 通过多集群 service 暴露将 service 进行负载,通过对 service 进行流量入口的配置,以达到多集群 service 的负载功能。 | ||
* 此功能不由 koffloader 管理,koffloader 同步完 service,由用户自行创建 ingress 或 gateway api。 | ||
<div style="text-align:center"> | ||
<img src="../images/koffloader.png" alt="Your Image Description"> | ||
</div> |
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# KCluster | ||
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kcluster crd 表示 koffloader 的 cluster 集群资源,存储集群的 kubeconfig 连接信息以及打通集群连接的配置信息。 | ||
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## Sample YAML | ||
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```yaml | ||
apiVersion: koffloader.io/koffloader/v1beta1 | ||
kind: KCluster | ||
metadata: | ||
name: cluster1 | ||
spec: | ||
clusterConnector: | ||
type: cilium/submariner | ||
ciliumNamespace: kube-system | ||
kubeconfig: | ||
secretName: cluster1 | ||
secretNamespace: koffloader-system | ||
status: | ||
kmulticluster: koffloader-clusters | ||
clusterConnector: cilium | ||
``` | ||
## KCluster definition | ||
### Metadata | ||
| Field | Description | Schema | Validation | | ||
|-------|-----------------|---------|------------| | ||
| name | kcluster 资源名称 | string | required | | ||
### Spec | ||
| Field | Description | Schema | Validation | Values | Default | | ||
|------------------|----------------------------------------|-----------------------------------------------------------------------------------|------------|-----------|---------| | ||
| clusterConnector | 指定使用哪种方式打通集群的连通性(cilium 或 submariner) | [koffloaderClusterConnector](./crd-kcluster-zh_CN.md#koffloaderClusterConnector) | required | | | | ||
| kubeconfig | 集群 kubeconfig 连接信息存储 | [koffloaderClusterConfig](./crd-kcluster-zh_CN.md#koffloaderClusterConfig) | required | | | | ||
#### koffloaderClusterConnector | ||
| Field | Description | Schema | Validation | Values | | ||
|-----------------|----------------|--------|------------|-------------------| | ||
| type | 指定打通多集群连通性的方式 | string | required | cilium、submariner | | ||
| ciliumNamespace | cilium 所在的命名空间 | string | optional | | | ||
#### koffloaderClusterConfig | ||
| Field | Description | Schema | Validation | Values | | ||
|-----------------|-------------------------------|--------|------------|----------| | ||
| secretName | 集群 kubeconfig 存储的 secret 名称 | string | required | | | ||
| secretNamespace | 集群 kubeconfig 存储的 secret 命名空间 | string | required | | | ||
### Status (subresource) | ||
| Field | Description | Schema | | ||
|----------------------|-------------------------|----------| | ||
| kmulticluster | 所属 kmulticluster 资源名称 | string | | ||
| clusterConnector | 集群连通器类型 | string | |
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# KClusterGroup | ||
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KClusterGroup crd 表示多集群连通的配置。 | ||
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## Sample YAML | ||
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```yaml | ||
apiVersion: koffloader.io/koffloader/v1beta1 | ||
kind: KClusterGroup | ||
metadata: | ||
name: koffloader-cluster1 | ||
spec: | ||
clusterConnectorType: cilium/submariner | ||
ciliumClusterMeshServiceType: nodeport | ||
kclusterSelector: | ||
matchLabels: | ||
app: test | ||
status: | ||
matchKCluster: | ||
- cluster1 | ||
- cluster2 | ||
clusterConnector: cilium | ||
``` | ||
## KClusterGroup definition | ||
### Metadata | ||
| Field | Description | Schema | Validation | | ||
|-------|---------------------|----------|--------------| | ||
| name | KMultiCluster 资源名称 | string | required | | ||
### Spec | ||
| Field | Description | Schema | Validation | Values | Default | | ||
|------------------------------|------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|------------|---------------------------------|---------| | ||
| kclusterSelector | 指定哪些 kcluster 组成 KMultiCluster 多集群连通 | [labelSelector](https://github.com/kubernetes/kubernetes/blob/v1.29.0/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/types.go#L1213) | required | | | | ||
| clusterConnectorType | 指定打通多集群连通性的方式 | string | required | | | | ||
| ciliumClusterMeshServiceType | 指定 cilium clustermesh apiserver 的 service 类型 | string | required | NodePort、ClusterIP、LoadBalancer | | | ||
### Status (subresource) | ||
| Field | Description | Schema | | ||
|--------------------------|---------------------------------|-------------| | ||
| clusterConnector | 多集群连通性类型 | string | | ||
| matchKCluster | 哪些 kcluster 资源组成 KMultiCluster | string 数组 | |
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# ServiceExportPolicy | ||
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ServiceExportPolicy crd 表示 koffloader 的 service 发现策略。 | ||
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## Sample YAML | ||
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```yaml | ||
apiVersion: koffloader.io/koffloader/v1beta1 | ||
kind: ServiceExportPolicy | ||
metadata: | ||
name: service-policy | ||
spec: | ||
serviceSelector: | ||
matchLabels: | ||
app: test | ||
ciliumServiceFeature: | ||
share: ture | ||
affinity: remote | ||
global: true | ||
kclusterSelector: | ||
matchLabels: | ||
app: test | ||
status: | ||
matchService: | ||
- name: test | ||
namespace: default | ||
matchKCluster: | ||
- cluster1 | ||
- cluster2 | ||
``` | ||
## ServiceExportPolicy definition | ||
### Metadata | ||
| Field | Description | Schema | Validation | | ||
|-------|-------------------------------|---------|------------| | ||
| name | ServiceExportPolicy 资源名称 | string | required | | ||
### Spec | ||
| Field | Description | Schema | Validation | Values | Default | | ||
|----------------------|------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------|------------|-----------|---------| | ||
| serviceSelector | 指定哪些 service 需要发现 | [labelSelector](https://github.com/kubernetes/kubernetes/blob/v1.29.0/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/types.go#L1213) | required | | | | ||
| kclusterSelector | 指定哪些 kcluster 生效该策略 | [labelSelector](https://github.com/kubernetes/kubernetes/blob/v1.29.0/staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/types.go#L1213) | required | | | | ||
| ciliumServiceFeature | 使用 cilium 进行多集群连通时,service 的发现策略配置 | [ciliumServiceFeature](./crd-kcluster-zh_CN.md#koffloaderClusterConfig) | optional | | | | ||
#### ciliumServiceFeature | ||
| Field | Description | Schema | Validation | Values | | ||
|----------|---------------------------|--------|------------|-------------------| | ||
| share | service 是否可以被其他集群发现 | bool | optional | | | ||
| affinity | service 负载的优先级 | string | optional | local,remote,none | | ||
| global | service 是否作为多集群全局 service | bool | optional | | | ||
### Status (subresource) | ||
| Field | Description | Schema | | ||
|---------------------|--------------------|-----------------------------------------------------------| | ||
| matchService | 策略生效在哪些 service | [matchService](./crd-kcluster-zh_CN.md#matchService) 数组 | | ||
| matchKCluster | 策略生效在哪些 kcluster | string 数组 | | ||
#### matchService | ||
| Field | Description | Schema | | ||
|-----------|-------------------|-----------| | ||
| name | service 名称 | string | | ||
| namespace | service 命名空间 | string | |