1．安装好与其他主机相同的操作系统，并配置好IP地址；
2．按照系统配置需求一节配置好主机名/内核参数并将其他的主机名和IP对应关系加入到
/etc/hosts中；
3．修改每台集群主机上/etc/hosts文件，将新增的主机IP地址与主机对应关系加入到/etc/hosts
文件中；
4．按照系统配置需求一节验证配置的正确性。
5．按照SequoiaDB服务器安装一节，安装SequoiaDB软件。安装时，注意配置管理服务端口与现有系统的端口保持一致。
下面对上面环境增加一台主机
1:对新安装的操作系统按照上面提到的图形界面安装或者文本安装，安装好数据库软件
2：配置IP地址为192.168.25.156
3：配置hostname，可以直接在操作系统中执行：hostname sdbserver4
4：修改host文件
vi /etch/hosts
192.168.25.156 sdbserver4 sdbserver4
192.168.25.151 sdbserver1 sdbserver1
192.168.25.152 sdbserver2 sdbserver2
192.168.25.153 sdbserver3 sdbserver3
按wq!，进行保存退出
在其他节点上同样修改host文件，保证所有的节点host文件一致。
5：在192.168.25.156中增加新的数据节点
sdbserver4:~ # /opt/sequoiadb/bin/sdb
Welcome to SequoiaDB shell!
help() for help, Ctrl+c or quit to exit
> var db = new Sdb("192.168.25.156",50000)
(nofile):0 uncaught exception: -15 ----------------报错提示不明确
Takes 0.536s.
> var db = new Sdb("192.168.25.151",50000)
Takes 0.9074s.
> var datarg = db.getRG("datagroup1")
Takes 0.2140s.
> var datarg = db.getRG("datagroup1")
Takes 0.2196s.
> node3= =datarg.createNode("sdbserver4",51000,"/opt/sequoiadb/database/data/51000")
sdbserver4:51000
Takes 0.21246s.
> node3.start()
Takes 7.26959s.
启动节点后，用shell命令查询节点情况：
> db.listReplicaGroups();
{
"Group": [
{
"dbpath": "/opt/sequoiadb/database/cata/30000",
"HostName": "sdbserver1",
"Service": [
{
"Type": 0,
"Name": "30000"
},
{
"Type": 1,
"Name": "30001"
},
{
"Type": 2,
"Name": "30002"
},
{
"Type": 3,
"Name": "30003"
}
],
"NodeID": 1
},
{
"HostName": "sdbserver2",
"dbpath": "/opt/sequoiadb/database/cata/30000",
"Service": [
{
"Type": 0,
"Name": "30000"
},
{
"Type": 1,
"Name": "30001"
},
{
"Type": 2,
"Name": "30002"
},
{
"Type": 3,
"Name": "30003"
}
],
"NodeID": 4
},
{
"HostName": "sdbserver3",
"dbpath": "/opt/sequoiadb/database/cata/30000",
"Service": [
{
"Type": 0,
"Name": "30000"
},
{
"Type": 1,
"Name": "30001"
},
{
"Type": 2,
"Name": "30002"
},
{
"Type": 3,
"Name": "30003"
}
],
"NodeID": 5
},
{
"HostName": "sdbserver4",
"dbpath": "/opt/sequoiadb/database/cata/30000",
"Service": [
{
"Type": 0,
"Name": "30000"
},
{
"Type": 1,
"Name": "30001"
},
{
"Type": 2,
"Name": "30002"
},
{
"Type": 3,
"Name": "30003"
}
],
"NodeID": 6
}
],
"GroupID": 1,
"GroupName": "SYSCatalogGroup",
"PrimaryNode": 1,
"Role": 2,
"Status": 1,
"Version": 8,
"_id": {
"$oid": "526e1ae519b8314ddc83b1f4"
}
}
{
"Group": [
{
"HostName": "sdbserver1",
"dbpath": "/opt/sequoiadb/database/data/51000",
"Service": [
{
"Type": 0,
"Name": "51000"
},
{
"Type": 1,
"Name": "51001"
},
{
"Type": 2,
"Name": "51002"
}
],
"NodeID": 1000
},
{
"HostName": "sdbserver2",
"dbpath": "/opt/sequoiadb/database/data/51000",
"Service": [
{
"Type": 0,
"Name": "51000"
},
{
"Type": 1,
"Name": "51001"
},
{
"Type": 2,
"Name": "51002"
}
],
"NodeID": 1001
},
{
"HostName": "sdbserver3",
"dbpath": "/opt/sequoiadb/database/data/51000",
"Service": [
{
"Type": 0,
"Name": "51000"
},
{
"Type": 1,
"Name": "51001"
},
{
"Type": 2,
"Name": "51002"
}
],
"NodeID": 1002
},
{
"HostName": "sdbserver4",
"dbpath": "/opt/sequoiadb/database/data/51000",
"Service": [
{
"Type": 0,
"Name": "51000"
},
{
"Type": 1,
"Name": "51001"
},
{
"Type": 2,
"Name": "51002"
}
],
"NodeID": 1003
}
],
"GroupID": 1000,
"GroupName": "datagroup1",
"PrimaryNode": 1002,
"Role": 0,
"Status": 1,
"Version": 5,
"_id": {
"$oid": "526e1d4519b8314ddc83b1f5"
}
}
Return 2 row(s).
Takes 0.3383s.
从上面Sequoiadb Shell命令行结果中，检查分区组配置情况，可以看到数据组新增了一个数据节点。
在监控页面中，我们更加清晰的看到物理设备中添加了一台sdbserver4的主机。
上面为新增加的节点信息。
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