GBase 8a提供了gcadmin 命令可以返回集群节点的IP地址/主机名，以及各个服务的状态，如果用户要循环每个IP做一些操作，需要解析该输出。本文提供一种采用grep，快捷的获得coordinator和gnode的IP地址的方法。
环境
2节点集群，1个调度节点，2个数据节点。集群版本8.5.2.43
[root@rh6-1 ~]# gcadmin
CLUSTER STATE: ACTIVE
CLUSTER MODE: NORMAL
=================================================================
| GBASE COORDINATOR CLUSTER INFORMATION |
=================================================================
| NodeName | IpAddress |gcware |gcluster |DataState |
-----------------------------------------------------------------
| coordinator1 | 10.0.2.201 | OPEN | OPEN | 0 |
-----------------------------------------------------------------
=============================================================
| GBASE DATA CLUSTER INFORMATION |
=============================================================
|NodeName | IpAddress |gnode |syncserver |DataState |
-------------------------------------------------------------
| node1 | 10.0.2.201 | OPEN | OPEN | 0 |
-------------------------------------------------------------
| node2 | 10.0.2.202 |CLOSE | CLOSE | 1 |
-------------------------------------------------------------
[root@rh6-1 ~]#
获得调度节点coordinator的所有IP或主机名
获得coordinator的XML格式的信息
root@rh6-1 ~]# gcadmin showcluster c f
<?xml version='1.0' encoding="utf-8"?>
<ClusterInfo>
<ClusterState>ACTIVE</ClusterState>
<ClusterMode>NORMAL</ClusterMode>
<CoordinatorNodes>
<CoordinatorNode>
<NodeName>coordinator1</NodeName>
<IpAddress>10.0.2.201</IpAddress>
<gcware>OPEN</gcware>
<gcluster>OPEN</gcluster>
<DataState>0</DataState>
</CoordinatorNode>
</CoordinatorNodes>
</ClusterInfo>
用grep解析XML格式获得coordinator的IP信息
只需要grep,而且对于一行有多个IP的也能解析出来。
[root@rh6-1 ~]# gcadmin showcluster c f | grep -oP '(?<=<IpAddress>)(.+?)(?=</IpAddress>)'
10.0.2.201
获得数据节点coordinator的所有IP或主机名
获得数据节点的XML格式的信息
[root@rh6-1 ~]# gcadmin showcluster d f
<?xml version='1.0' encoding="utf-8"?>
<ClusterInfo>
<ClusterState>ACTIVE</ClusterState>
<ClusterMode>NORMAL</ClusterMode>
<DataserverNodes>
<DataServerNode>
<NodeName>node1</NodeName>
<IpAddress>10.0.2.201</IpAddress>
<gnode>OPEN</gnode>
<syncserver>OPEN</syncserver>
<DataState>0</DataState>
</DataServerNode>
<DataServerNode>
<NodeName>node2</NodeName>
<IpAddress>10.0.2.202</IpAddress>
<gnode>CLOSE</gnode>
<syncserver>CLOSE</syncserver>
<DataState>1</DataState>
</DataServerNode>
</DataserverNodes>
</ClusterInfo>
用grep解析数据节点的XML信息获得IP
[root@rh6-1 ~]# gcadmin showcluster d f | grep -oP '(?<=<IpAddress>)(.+?)(?=</IpAddress>)'
10.0.2.201
10.0.2.202
获得集群所有节点的IP信息
由于端口不同，除非是操作系统级操作需要每个集群IP信息。
[root@rh6-1 ~]# gcadmin showcluster f | grep -oP '(?<=<IpAddress>)(.+?)(?=</IpAddress>)'
10.0.2.201
10.0.2.201
10.0.2.202
因为有复合节点，要排序后去重一下sort+uniq
[root@rh6-1 ~]# gcadmin showcluster f | grep -oP '(?<=<IpAddress>)(.+?)(?=</IpAddress>)' | sort | uniq
10.0.2.201
10.0.2.202
[root@rh6-1 ~]#
