ONgDB集群测试

ONgDB项目是neo4j企业版的一个开源分支。另外ONgDB的发起组织也在快速更新。目前最新是3.6.0版本，与企业版neo4j-3.6.0版本功能基本一致。目前企业版neo4j已经更新到4.0版本，最大的特点是支持分库操作，ONgDB还不支持分库操作。

一、安装虚拟机

使用VMware虚拟机安装CentOS7，搭建三个节点的集群。

CentOS7是服务器常用的常用的操作系统，一般安装好系统之后JDK8默认就安装了。三台机器用户名均为ongdb，密码123456。虚拟机装好之后继续操作。
1、配置hosts

vim /etc/hosts
# 新增如下内容
192.168.91.128  node-1
192.168.91.129  node-2
192.168.91.130  node-3

2、配置可打开文件数

vim /etc/security/limits.conf
# 新增如下内容
neo4j soft nofile 40000
neo4j hard nofile 40000

二、关闭防火墙

# 查看防火墙状态
systemctl status firewalld.service
# 关闭防火墙
systemctl disable firewalld.service

三、配置互信

1、修改SSH配置文件

vim /etc/ssh/sshd_config 
# 找到下列行 去掉注释井号#
 RSAAuthentication yes //字面意思..允许RSA认证
 PubkeyAuthentication yes //允许公钥认证
 AuthorizedKeysFile .ssh/authorized_keys //公钥存放在.ssh/au..文件中
# 保存退出。
# 修改后需要重启ssh
systemctl restart sshd      
# 分别在host1，host2和host3上执行上述命令。

2、生成密码对

ssh-keygen -t rsa     
# 直接回车几次，可在默认路径~/.ssh/下生成私钥idrsa公钥idrsa.pub。
# 分别在host1，host2和host3上执行上述命令

3、生成authorized_keys

# 将host2、host3的公钥传到host1上。
# 在host2上输入
scp /home/ongdb/.ssh/id_rsa.pub ongdb@host1:~/.ssh/id_rsa.pub.host2

# 在host3上输入
scp /home/ongdb/.ssh/id_rsa.pub ongdb@host1:~/.ssh/id_rsa.pub.host3

# 以上命令目前还需要输入目标机用户密码。
# 在host1上输入
cd ~/.ssh/  
ls  

# 查看idrsa.pub.host2、idrsa.pub.host3是否已经传输过来。
$ cat id_rsa.pub >> authorized_keys
$ cat id_rsa.pub.host2 >> authorized_keys 
$ cat id_rsa.pub.host3 >> authorized_keys     

# 生成authorized_keys。
# 给authorized_keys修改权限
chmod 644 authorized_keys 

# 利用scp把该文件传送到host2、host3的.ssh/下
scp authorized_keys hadoop@host2:~/.ssh/
scp authorized_keys hadoop@host3:~/.ssh/

4、验证

# 测试在host1下输入
$ssh host2   
$exit
$ssh host3   
$exit  
# 应该都不需要密码。 这三个互联都应该不需要密码。

四、节点修改密码

节点在启动之后必须要先进shell修改密码，首次进入默认的用户密码都是neo4j。

[ongdb@node-1 ongdb-node-1]$ bin/cypher-shell 
username: neo4j
password: *****
Connected to Neo4j 3.5.16 at bolt://localhost: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.
neo4j> CALL dbms.changePassword('123456');
0 rows available after 320 ms, consumed after another 2 ms
neo4j>

五、配置两个CORE节点

ongdb-node-1配置

#*****************************************************************
# Network connector configuration
#*****************************************************************

dbms.connectors.default_listen_address=0.0.0.0
dbms.connectors.default_advertised_address=node-1

# Bolt connector
dbms.connector.bolt.enabled=true
#dbms.connector.bolt.tls_level=OPTIONAL
dbms.connector.bolt.listen_address=:7687

# HTTP Connector. There can be zero or one HTTP connectors.
dbms.connector.http.enabled=true
dbms.connector.http.listen_address=:7474

# HTTPS Connector. There can be zero or one HTTPS connectors.
dbms.connector.https.enabled=true
dbms.connector.https.listen_address=:7473

#*****************************************************************
# Causal Clustering Configuration
#*****************************************************************
dbms.mode=CORE

causal_clustering.minimum_core_cluster_size_at_formation=2
causal_clustering.minimum_core_cluster_size_at_runtime=2
causal_clustering.initial_discovery_members=node-1:5000,node-2:5001
causal_clustering.discovery_listen_address=:5000

# Remote debugging
dbms.jvm.additional=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005

# algo|apoc|* plugins
dbms.security.procedures.unrestricted=algo.*,apoc.*,*
apoc.export.file.enabled=true
apoc.import.file.enabled=true

#********************************************************************
# Prometheus monitor
#********************************************************************
# Enable the Prometheus endpoint. Default is 'false'.
metrics.prometheus.enabled=true
# The default is localhost:2004.
metrics.prometheus.endpoint=localhost:2004

ongdb-node-2配置

#*****************************************************************
# Network connector configuration
#*****************************************************************

dbms.connectors.default_listen_address=0.0.0.0
dbms.connectors.default_advertised_address=node-2

# Bolt connector
dbms.connector.bolt.enabled=true
#dbms.connector.bolt.tls_level=OPTIONAL
dbms.connector.bolt.listen_address=:7687

# HTTP Connector. There can be zero or one HTTP connectors.
dbms.connector.http.enabled=true
dbms.connector.http.listen_address=:7474

# HTTPS Connector. There can be zero or one HTTPS connectors.
dbms.connector.https.enabled=true
dbms.connector.https.listen_address=:7473

#*****************************************************************
# Causal Clustering Configuration
#*****************************************************************
dbms.mode=CORE

causal_clustering.minimum_core_cluster_size_at_formation=2
causal_clustering.minimum_core_cluster_size_at_runtime=2
causal_clustering.initial_discovery_members=node-1:5000,node-2:5001
causal_clustering.discovery_listen_address=:5000

# Remote debugging
dbms.jvm.additional=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005

# algo|apoc|* plugins
dbms.security.procedures.unrestricted=algo.*,apoc.*,*
apoc.export.file.enabled=true
apoc.import.file.enabled=true

#********************************************************************
# Prometheus monitor
#********************************************************************
# Enable the Prometheus endpoint. Default is 'false'.
metrics.prometheus.enabled=true
# The default is localhost:2004.
metrics.prometheus.endpoint=localhost:2004

六、增加一个只读READ_REPLICA节点

ongdb-node-3配置

#*****************************************************************
# Network connector configuration
#*****************************************************************

dbms.connectors.default_listen_address=0.0.0.0
dbms.connectors.default_advertised_address=node-3

# Bolt connector
dbms.connector.bolt.enabled=true
#dbms.connector.bolt.tls_level=OPTIONAL
dbms.connector.bolt.listen_address=:7687

# HTTP Connector. There can be zero or one HTTP connectors.
dbms.connector.http.enabled=true
dbms.connector.http.listen_address=:7474

# HTTPS Connector. There can be zero or one HTTPS connectors.
dbms.connector.https.enabled=true
dbms.connector.https.listen_address=:7473

#*****************************************************************
# Causal Clustering Configuration
#*****************************************************************
dbms.mode=READ_REPLICA

causal_clustering.minimum_core_cluster_size_at_formation=2
causal_clustering.minimum_core_cluster_size_at_runtime=2
causal_clustering.initial_discovery_members=node-1:5000,node-2:5001,node-3:5002
causal_clustering.discovery_listen_address=:5002

# Remote debugging
dbms.jvm.additional=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005

# algo|apoc|* plugins
dbms.security.procedures.unrestricted=algo.*,apoc.*,*
apoc.export.file.enabled=true
apoc.import.file.enabled=true

#********************************************************************
# Prometheus monitor
#********************************************************************
# Enable the Prometheus endpoint. Default is 'false'.
metrics.prometheus.enabled=true
# The default is localhost:2004.
metrics.prometheus.endpoint=localhost:2004

七、检验apoc和algo插件

CALL algo.list()
CALL apoc.config.list()

八、查看集群成员角色

CALL dbms.cluster.overview()
CALL dbms.cluster.role()

kill掉节点2，之后再看一下：

一、安装虚拟机

二、关闭防火墙

三、配置互信

四、节点修改密码

五、配置两个CORE节点

六、增加一个只读READ_REPLICA节点

七、检验apoc和algo插件

八、查看集群成员角色

九、更多信息

ONgDB集羣測試

Neo4j有哪些版本？

Neo4j 4.0有什麼新特性？

Neo4j圖數據庫包含哪些功能和組件？

Neo4j因果集羣讀寫分離

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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