关于云原生:Nebula-Operator-云上实践

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嗨，大家好！Nebula Operator 开源也有一段时间了，之前也有一篇相干的博客介绍，然而实际相干的博客却还没有，当初：

它来了！来了！它带着 实际 走来了！

Nebula Operator 介绍

对于 Nebula Operator 的介绍，大家能够参考之前那篇博客：一文详解云上自动化部署集群管理工具 Nebula Operator。

本文将次要侧重于实际方向，让你能很快地动手 Nebula Operator，体验图数据库的乐趣！

Nebula Operator 云上实际

到这里，开始进入正题，本文将应用阿里云进行 Nebula Operator 实际，其余云厂商相似。

装置工具

本次实际须要在操作电脑上装置如下根底工具：

  • Kubectl
  • Helm
  • Docker

以上根底工具相干的装置办法请参考对应链接。

创立云上 Kubernetes

因为 Operator 是依靠于 Kubernetes 的，所以在进行 Nebula Operator 实际之前，须要先筹备好 Kubernetes 环境。

首先进入到阿里云的控制台，而后进入到 容器服务 Kubernetes 版，再创立一个集群。此实际抉择的是 ACK 托管版，相干的创立参数请按需抉择。

留神：为了不便外网拜访 Kubernetes API Server，本次实际勾选了 应用 EIP 裸露 API Server，你能够依据本身状况抉择是否启用，如果不开启，你须要买通操作电脑与 Kubernetes 的之间网络。其余参数请按需抉择。

期待 Kubernetes 集群启动后，将集群的 连贯信息 中公网拜访 中的内容复制到计算机 $HOME/.kube/config 文件中。

而后你能够应用如下命令验证下 Kubernetes 集群：

$ kubectl get nodes
NAME                         STATUS   ROLES    AGE   VERSION
cn-beijing.192.168.250.13    Ready    <none>   51m   v1.20.4-aliyun.1
cn-beijing.192.168.250.185   Ready    <none>   51m   v1.20.4-aliyun.1
cn-beijing.192.168.250.89    Ready    <none>   51m   v1.20.4-aliyun.1

装置 Nebula Operator 依赖

在装置 Nebula Operator 之前，还须要先装置一些依赖。

装置 CertManager

# 装置 CertManager
$ helm install cert-manager cert-manager --repo https://charts.jetstack.io \
    --namespace cert-manager --create-namespace --version v1.3.1 \
    --set installCRDs=true
# 稍等一会儿，检测 CertManager 是否启动失常
$ kubectl -n cert-manager get pod
NAME                                       READY   STATUS    RESTARTS   AGE
cert-manager-7998c69865-jfw9x              1/1     Running   0          93s
cert-manager-cainjector-7b744d56fb-846w9   1/1     Running   0          93s
cert-manager-webhook-7d6d4c78bc-ssk4w      1/1     Running   0          93s

装置 OpenKruise

# 装置 OpenKruise
$ helm install kruise \
    https://github.com/openkruise/kruise/releases/download/v0.8.1/kruise-chart.tgz
# 稍等一会儿，检测 OpenKruise 是否启动失常
$ kubectl -n kruise-system get pod
NAME                                         READY   STATUS    RESTARTS   AGE
kruise-controller-manager-6797f89d9b-ppv65   1/1     Running   0          49s
kruise-controller-manager-6797f89d9b-wlkbd   1/1     Running   0          49s
kruise-daemon-7rljq                          1/1     Running   0          49s
kruise-daemon-8kd8d                          1/1     Running   0          49s
kruise-daemon-n6tdw                          1/1     Running   0          49s

增加 Nebula Operator Charts

# 增加 Nebula Operator Charts Repo
$ helm repo add nebula-operator https://vesoft-inc.github.io/nebula-operator/charts
# 更新 repo
$ helm repo update

装置 Nebula Operator

因为阿里云上无奈拉取 gcr.io 和k8s.gcr.io镜像，因而须要指定国内镜像，这里进行了如下替换：

原镜像 替换后镜像
gcr.io/kubebuilder/kube-rbac-proxy:v0.8.0 kubesphere/kube-rbac-proxy:v0.8.0
k8s.gcr.io/kube-scheduler:v1.18.8 kubesphere/kube-scheduler:v1.18.8

你能够通过如下命令查看所有能够设置的参数：

$ helm show values nebula-operator/nebula-operator

此次实际中的装置命令如下：

# 装置 Nebula Operator
$ helm install nebula-operator nebula-operator/nebula-operator \
    --namespace nebula-operator-system --create-namespace --version 0.1.0 \
    --set image.kubeRBACProxy.image=kubesphere/kube-rbac-proxy:v0.8.0 \
    --set image.kubeScheduler.image=kubesphere/kube-scheduler:v1.18.8
# 稍等一会儿，检测 Nebula Operator 是否启动失常
$ kubectl -n nebula-operator-system get pod
NAME                                                             READY   STATUS    RESTARTS   AGE
nebula-operator-controller-manager-deployment-6968547fff-k62b4   2/2     Running   0          19s
nebula-operator-controller-manager-deployment-6968547fff-lhpdx   2/2     Running   0          19s
nebula-operator-scheduler-deployment-7c5fc7945-hbkv8             2/2     Running   0          19s
nebula-operator-scheduler-deployment-7c5fc7945-sxc7w             2/2     Running   0          19s

如果你自定义了 Kubernetes 的 Cluster Domain，则须要批改装置命令，减少设置kubernetesClusterDomain，如下：

# 装置 Nebula Operator，请批改 <<YourCustomCLusterDomain>>
$ helm install nebula-operator nebula-operator/nebula-operator \
    --namespace nebula-operator-system --create-namespace --version 0.1.0 \
    --set image.kubeRBACProxy.image=kubesphere/kube-rbac-proxy:v0.8.0 \
    --set image.kubeScheduler.image=kubesphere/kube-scheduler:v1.18.8 \
    --set kubernetesClusterDomain=<<YourCustomCLusterDomain>>

部署 Nebula Cluster

至此，Nebula Operator 曾经就绪，接下来装置 Nebula Cluster 来体验图数据吧！

首先，须要获取 StorageClass，这个将会用来设置Nebula Cluster 所应用的存储。

$ kubectl get sc
NAME                       PROVISIONER                       RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
alicloud-disk-available    diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-efficiency   diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-essd         diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-ssd          diskplugin.csi.alibabacloud.com   Delete          Immediate              true                   100m
alicloud-disk-topology     diskplugin.csi.alibabacloud.com   Delete          WaitForFirstConsumer   true                   100m

从下面得悉，阿里云目前反对 5 种StorageClass。此次实际将会应用 alicloud-disk-ssd。其余云厂商会有对应的StorageClass，请依照理论状况进行抉择。
* 留神：每个云厂商可能对于申请存储的大小有范畴限度，比方阿里云对于 SSD 限度在20 Gi 到32,768 Gi，在创立 Nebula Cluster 的时候须要留神下。

你能够通过如下命令查看所有能够设置的参数：

$ helm show values nebula-operator/nebula-cluster

此次实际中的装置命令如下：

# 创立 Nebula Cluster 的名称
$ export NEBULA_CLUSTER_NAME=nebula
# 创立 Nebula Cluster 的 namespace
$ export NEBULA_CLUSTER_NAMESPACE=nebula
# 创立 Nebula Cluster 的 StorageClass 名称，这里设置为之前查找到的 alicloud-disk-ssd
$ export STORAGE_CLASS_NAME=alicloud-disk-ssd
# 创立 Nebula Cluster 中每个组建所应用存储的大小
$ export STORAGE_SIZE_GRAPHD=20Gi
$ export STORAGE_SIZE_METAD=20Gi
$ export STORAGE_SIZE_STORAGED=20Gi
# 创立 Nebula Cluster
$ helm install ${NEBULA_CLUSTER_NAME} nebula-operator/nebula-cluster \
    --namespace ${NEBULA_CLUSTER_NAMESPACE} --create-namespace --version 0.1.0 \
    --set nameOverride=${NEBULA_CLUSTER_NAME} \
    --set nebula.storageClassName="${STORAGE_CLASS_NAME}" \
    --set nebula.graphd.storage="${STORAGE_SIZE_GRAPHD}" \
    --set nebula.metad.storage="${STORAGE_SIZE_METAD}" \
    --set nebula.storaged.storage="${STORAGE_SIZE_STORAGED}"
# 稍等一会儿，检测 Nebula Cluster 是否启动失常
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get nebulacluster
NAME     GRAPHD-DESIRED   GRAPHD-READY   METAD-DESIRED   METAD-READY   STORAGED-DESIRED   STORAGED-READY   AGE
nebula   2                2              3               3             3                  3                4m10s
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get pod
NAME                READY   STATUS    RESTARTS   AGE
nebula-graphd-0     1/1     Running   0          96s
nebula-graphd-1     1/1     Running   0          96s
nebula-metad-0      1/1     Running   0          97s
nebula-metad-1      1/1     Running   0          97s
nebula-metad-2      1/1     Running   0          97s
nebula-storaged-0   1/1     Running   0          97s
nebula-storaged-1   1/1     Running   0          97s
nebula-storaged-2   1/1     Running   0          97s

当然，也能够将 Storaged 实例降级到 5 个，执行命令如下：

# 降级 Nebula Cluster
$ helm upgrade ${NEBULA_CLUSTER_NAME} nebula-operator/nebula-cluster \
    --namespace ${NEBULA_CLUSTER_NAMESPACE} --create-namespace --version 0.1.0 \
    --set nameOverride=${NEBULA_CLUSTER_NAME} \
    --set nebula.storageClassName="${STORAGE_CLASS_NAME}" \
    --set nebula.graphd.storage="${STORAGE_SIZE_GRAPHD}" \
    --set nebula.metad.storage="${STORAGE_SIZE_METAD}" \
    --set nebula.storaged.storage="${STORAGE_SIZE_STORAGED}" \
    --set nebula.storaged.replicas=5
# 稍等一会儿，检测 Nebula Cluster 是否启动失常
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get nebulacluster
NAME     GRAPHD-DESIRED   GRAPHD-READY   METAD-DESIRED   METAD-READY   STORAGED-DESIRED   STORAGED-READY   AGE
nebula   2                2              3               3             5                  5                6m12s
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get pod
NAME                READY   STATUS    RESTARTS   AGE
nebula-graphd-0     1/1     Running   0          2m30s
nebula-graphd-1     1/1     Running   0          2m30s
nebula-metad-0      1/1     Running   0          2m30s
nebula-metad-1      1/1     Running   0          2m30s
nebula-metad-2      1/1     Running   0          2m30s
nebula-storaged-0   1/1     Running   0          2m30s
nebula-storaged-1   1/1     Running   0          2m30s
nebula-storaged-2   1/1     Running   0          2m30s
nebula-storaged-3   1/1     Running   0          52s
nebula-storaged-4   1/1     Running   0          52s

具体的装置阐明请见：应用 Helm 装置 Nebula Operator。

拜访 Nebula Cluster

终于，Nebula Cluster 启动胜利了，接下来开始拜访集群吧！

Kubernetes 外部拜访

首先，在 Kubernetes 中启动一个 Nebula Graph Console，执行命令如下：

$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: nebula-console
spec:
  containers:
    - name: nebula-console
      image: vesoft/nebula-console:v2-nightly
      command:
      - sleep
      - "1000000"
EOF

而后再通过方才创立的 Nebula Graph Console 来拜访集群，如下：

$ kubectl exec -it nebula-console -- \
    nebula-console -u u -p p --addr ${NEBULA_CLUSTER_NAME}-graphd-svc.${NEBULA_CLUSTER_NAMESPACE}.svc --port 9669
2021/06/23 06:21:22 [INFO] connection pool is initialized successfully
Welcome to Nebula Graph!
(u@nebula) [(none)]> show hosts
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| Host                                                                  | Port | Status   | Leader count | Leader distribution  | Partition distribution |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-0.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-1.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-2.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-3.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-4.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "Total"                                                               |      |          | 0            |                      |                        |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
Got 4 rows (time spent 7669/9367 us)
Wed, 23 Jun 2021 06:21:26 UTC

Kubernetes 内部拜访

Kubernetes 外部的服务在集群内部要想拜访，能够应用 hostPort、hostNetwork、Ingress、LoadBalancer 等。这里利用云厂商的便利性，间接应用 LoadBalancer 来拜访集群。

留神：此办法会裸露你的 Nebula 集群，请勿在生产环境应用。

首先，将 Graphd Service 的type改成LoadBalancer，而后再查看EXTERNAL-IP。

# 将 service 的 type 改成 LoadBalancer
$ kubectl patch -n ${NEBULA_CLUSTER_NAMESPACE} svc ${NEBULA_CLUSTER_NAME}-graphd-svc \
    -p '{"spec": {"type":"LoadBalancer"}}'
# 获取 EXTERNAL-IP，如果为 pending，请稍等一会儿再重试
$ kubectl -n ${NEBULA_CLUSTER_NAMESPACE} get svc nebula-graphd-svc
NAME                TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)                                          AGE
nebula-graphd-svc   LoadBalancer   172.16.85.222   x.x.x.x         9669:31460/TCP,19669:32579/TCP,19670:31481/TCP   27m

当初，能够依据 EXTERNAL-IP 来拜访集群了，比方此处为x.x.x.x。

$ export EXTERNAL_IP=x.x.x.x
$ docker run -it --rm vesoft/nebula-console:v2-nightly -u u -p p --addr ${EXTERNAL_IP} --port 9669
2021/06/23 06:42:17 [INFO] connection pool is initialized successfully
Welcome to Nebula Graph!
(u@nebula) [(none)]> show hosts
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| Host                                                                  | Port | Status   | Leader count | Leader distribution  | Partition distribution |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-0.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-1.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-2.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-3.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "nebula-storaged-4.nebula-storaged-headless.nebula.svc.cluster.local" | 9779 | "ONLINE" | 0            | "No valid partition" | "No valid partition"   |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
| "Total"                                                               |      |          | 0            |                      |                        |
+-----------------------------------------------------------------------+------+----------+--------------+----------------------+------------------------+
Got 4 rows (time spent 3747/60433 us)
Wed, 23 Jun 2021 06:42:21 UTC

享受工夫

功败垂成！

纵情地在 Nebula Graph 中驰骋吧！

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