从 Kubernetes 外部访问 Neo4j 集群
Enterprise Edition

默认情况下，服务器端路由用于从 Kubernetes 外部访问 Neo4j 集群。

使用负载均衡器和 Cypher Shell 访问 Neo4j 集群

创建 LoadBalancer 服务以从 Kubernetes 外部访问 Neo4j 集群。

  1. 使用安装时使用的 neo4j.name 检查 LoadBalancer 服务是否可用

    export NEO4J_NAME=my-cluster
kubectl get service ${NEO4J_NAME}-lb-neo4j
    NAME                  TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)                                        AGE
my-cluster-lb-neo4j   LoadBalancer   10.28.12.119   82.21.42.42      7474:32169/TCP,7473:32145/TCP,7687:32624/TCP   2m1s

  2. 使用 kubectl describe service 查看服务详细信息

    kubectl describe service ${NEO4J_NAME}-lb-neo4j
    Name:                     my-cluster-lb-neo4j
Namespace:                neo4j
Labels:                   app=my-cluster
                          app.kubernetes.io/managed-by=Helm
                          helm.neo4j.com/neo4j.name=my-cluster
                          helm.neo4j.com/service=neo4j
Annotations:              cloud.google.com/neg: {"ingress":true}
                          meta.helm.sh/release-name: server-1
                          meta.helm.sh/release-namespace: neo4j
Selector:                 app=my-cluster,helm.neo4j.com/clustering=true,helm.neo4j.com/neo4j.loadbalancer=include
Type:                     LoadBalancer
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.28.12.119
IPs:                      10.28.12.119
LoadBalancer Ingress:     82.21.42.42
Port:                     http  7474/TCP
TargetPort:               7474/TCP
NodePort:                 http  32169/TCP
Endpoints:                10.24.0.131:7474,10.24.1.3:7474,10.24.1.67:7474
Port:                     https  7473/TCP
TargetPort:               7473/TCP
NodePort:                 https  32145/TCP
Endpoints:                10.24.0.131:7473,10.24.1.3:7473,10.24.1.67:7473
Port:                     tcp-bolt  7687/TCP
TargetPort:               7687/TCP
NodePort:                 tcp-bolt  32624/TCP
Endpoints:                10.24.0.131:7687,10.24.1.3:7687,10.24.1.67:7687
Session Affinity:         None
External Traffic Policy:  Local
HealthCheck NodePort:     30621
Events:
  Type    Reason                Age    From                Message
  ----    ------                ----   ----                -------
  Normal  EnsuringLoadBalancer  3m11s  service-controller  Ensuring load balancer
  Normal  EnsuredLoadBalancer   2m36s  service-controller  Ensured load balancer

    负载均衡器服务可以向所有集群服务器发送请求。

  3. 从本地机器运行 cypher-shell 并连接到 LoadBalancer Ingress 地址，在本例中为 82.21.42.42

    ./cypher-shell -a neo4j://82.21.42.42 -u neo4j -p my-password
    If you don't see a command prompt, try pressing enter.
Connected to Neo4j using Bolt protocol version 5 at neo4j://82.21.42.42:7687 as user neo4j.
Type :help for a list of available commands or :exit to exit the shell.
Note that Cypher queries must end with a semicolon.

  4. 运行 Cypher 命令 SHOW DATABASES 以验证所有集群成员是否在线

    SHOW DATABASES;
    +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name     | type       | aliases | access       | address                                 | role      | writer | requestedStatus | currentStatus | statusMessage | default | home  | constituents |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| "neo4j"  | "standard" | []      | "read-write" | "server-3.neo4j.svc.cluster.local:7687" | "primary" | TRUE   | "online"        | "online"      | ""            | TRUE    | TRUE  | []           |
| "neo4j"  | "standard" | []      | "read-write" | "server-2.neo4j.svc.cluster.local:7687" | "primary" | FALSE  | "online"        | "online"      | ""            | TRUE    | TRUE  | []           |
| "neo4j"  | "standard" | []      | "read-write" | "server-1.neo4j.svc.cluster.local:7687" | "primary" | FALSE  | "online"        | "online"      | ""            | TRUE    | TRUE  | []           |
| "system" | "system"   | []      | "read-write" | "server-3.neo4j.svc.cluster.local:7687" | "primary" | FALSE  | "online"        | "online"      | ""            | FALSE   | FALSE | []           |
| "system" | "system"   | []      | "read-write" | "server-2.neo4j.svc.cluster.local:7687" | "primary" | FALSE  | "online"        | "online"      | ""            | FALSE   | FALSE | []           |
| "system" | "system"   | []      | "read-write" | "server-1.neo4j.svc.cluster.local:7687" | "primary" | TRUE   | "online"        | "online"      | ""            | FALSE   | FALSE | []           |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

6 rows
ready to start consuming query after 110 ms, results consumed after another 109 ms

  5. 运行 Cypher 命令 SHOW SERVERS 以验证所有集群成员是否已启用

    SHOW SERVERS;
    +----------------------------------------------------------------------------------------------------------------------------------+
| name                                   | address                                 | state     | health      | hosting             |
+----------------------------------------------------------------------------------------------------------------------------------+
| "ad5c3cf1-541a-44f8-a19b-28bc36030914" | "server-3.neo4j.svc.cluster.local:7687" | "Enabled" | "Available" | ["system", "neo4j"] |
| "cbdebc59-64c2-4542-a041-24a1f051e64f" | "server-1.neo4j.svc.cluster.local:7687" | "Enabled" | "Available" | ["system", "neo4j"] |
| "f37e98a7-15ec-4dc4-a6bf-df9e418a7488" | "server-2.neo4j.svc.cluster.local:7687" | "Enabled" | "Available" | ["system", "neo4j"] |
+----------------------------------------------------------------------------------------------------------------------------------+

3 rows
ready to start consuming query after 27 ms, results consumed after another 363 ms

    您可以看到节点正在公布其内部地址，但由于您未使用内部地址进行连接，因此您使用服务器端路由。

使用负载均衡器和 Neo4j 浏览器访问 Neo4j 集群

  1. 打开 Web 浏览器并将其指向 LoadBalancer Ingress 地址和端口 7474，在本例中为 http://82.21.42.42:7474/browser。

  2. 连接后，使用浏览器编辑器中的 :sysinfo 验证所有数据库是否已启动并正在运行

    :sysinfo

    helm sysinfo