클러스터는 페일오버 그룹, 병렬그룹등 다양한 리소스 그룹이 복수개 구성된 하나의 집합입니다.
클러스터는 MCCS 구성의 최상위이며 각 그룹들을 포함합니다. MCCS의 기본적인 설정값들을 관리하고 있습니다.

이 페이지의 주요 내용

Cluster Configuration

Two node Clsuter

Support Failover Group

Failover group is including the resources that can be run on only one node at a time.
Application will be switch over to standby node at critical reource is failed in a failover group. The resources that included group are online only available node.
For example, user would like to run backup software on both nodes and be managed by the MCCS, backup software should be online on both nodes at the same time. You can use parallel group instead of failover group for this.

Support Parallel Group

Parallel group is a group of resources that are taken online on more than two nodes at the same time. Parallel group cannot failover.
The opposition of this is Failover Group. The group can be online on a node in a cluster within a failover group. However, when configured through parallel group, specified application can be online, monitored and terminated on the multiple nodes at the same time in a cluster.
For example, user would like to run backup software on both nodes and be managed by the MCCS, backup software should be online on both nodes at the same time. You can use parallel group instead of failover group for this.

Support Single Node Group

한개의 노드에서 실행 될 수 있는 리소스로 구성된 그룹을 싱글 노드 그룹이라고 합니다. 싱글노드 그룹은 페일오버 하지 않습니다.
싱글노드 그룹은 포함된 리소스에 장애가 감지 되었을 경우 지정된 횟수 만큼 온라인을 시도합니다.

SingleNode Cluster

한개의 노드에서 실행 될 수 있는 리소스로 구성된 클러스터를 싱글 노드 클러스터라고 합니다. 싱글노드 클러스터는 페일오버 하지 않습니다.
싱글노드 클러스터에서는 오직 싱글노드 그룹만 지원합니다.

Cluster Attribute

Cluster attribute can be identified from clsuter Attributes view. From the group management view of MCCS web console, select the cluster, then select ‘Cluster Attributes’ tab located on the top of detailed information panel.

The values of gray colored are read only. They just contain and show the information of cluster state. The values of white colored are configurable by user definition. Below is description of some of them.

[Figure] Cluster Attribute View

Attribute	Description	Type	Defaults	Edit	Note
ClusterName	It is the name of the cluster. It is defined during the first time configuring the heartbeat.	NAME		X
GroupLimit	It is a maximum number of groups that can be added.	INTEGER	32ea	X
HBInterval	It is an interval for checking whether to receive heartbeat data, Heartbeat data is transferred at an interval 1/10 of this time.	INTEGER	2000ms	O
HBPort	It indicated the heartbeat server port.	PORT	14321	X
HBTimeout	It is ICMP test timeout for heartbeat network. If heartbeat data is disconnected, Timeout will take place, and the ICMP test will be conducted.	INTEGER	3sec	O
IsolationTestTmeout	It sets up the ICMP test timeout during the node isolation (SPLIT) test. For the test IP address, please refer to 'Isolation TestAddress' from Node Attribute of this chapter.	INTEGER	3sec	O
LogBackupCount	It indicates the limit of backuped log file count.	INTEGER	3ea	O
LogFileSize	It is the size of the log file. Minimum size is 64KB. while the maximum size is 10,000MB. If the size of the log file is greater than this, it will be backed up to mccs.log.1	INTEGER	1000Kb	O
LogLevel	It is the standard level of the log recorded in the log file. The log levels include DEBUG, INFO, WARN, ERROR and FATAL, and only those logs above this level will be recorded in the file.	LOG LEVEL	Info	O
NodeFaultDetectionTime	It is the time for detecting node failures. If the time from initial hearbeat disconnection to the disconnection of all heartbeats exceeds this time, it will be regarded as SPLIT, and if smaller, it will be considered a node failure.	INTEGER	30sec	O
PingRetryTime	Time to determine ping test failure. If the heartbeat data disconnects, it will try to ping during this time. If ping does not work after the time is exceed, it is determine as failure.	INTEGER	0sec	O
ResourceLimit	It is a maximum number of resources that can be added.	INTEGER	500ea	X
RMIConnectionTimeout	It is RMI connection timeout.	INTEGER	2sec	O
SingleNodeCluster	It is a cluster consist of a node.	BOOLEAN	false	X
SysLogLevel	It indicated the log level to be recorded in the Windows system log. Only those logs above this level will be recorded in the system log.	LOG LEVEL	Error	O

CLI 사용 (mccluster 명령)

MCCS 클러스터의 속성값을 수정 할 때 사용합니다. CLI를 사용하여 사용자가 원하는 속성 값을 수정 할 수 있습니다.

MCCS 는 설치 시 최초 사용자 계정으로 id 가 'admin' 암호가 'password'인 계정을 생성합니다.
CLI 명령을 실행 시 id 와 password를 입력하지 않으면 , 위의 최초 사용자 계정의 id와 암호로 실행됩니다.
따라서 최초 사용자의 패스워드 변경 시, 필수적으로 CLI 명령에 id와 password를 옵션으로 입력해야하만 합니다.

Syntax

mccluster [-u userid -pw password] [-c clusterName] [-a attributeName] attrVal

Options

옵션	설명
-h	도움말을 출력합니다.
-u	사용자 ID를 지정합니다.
-pw	-u 옵션의 사용자 Password를 지정합니다.
-c	명령을 실행하기 위해 접근할 클러스터를 지정합니다.
-a	수정하기 위한 속성값 이름을 지정합니다.

Example

modify

testCluster의 클러스터 속성을 수정합니다.

mccluster -u admin -pw password -modify -c testCluster -a attribute value

list

클러스터 상태를 출력합니다.

mccluster -u admin -pw password -list

3. Cluster