Veritas Cluster Server Bundled Agents Reference Guide
Veritas⢠Cluster Server Bundled Agents Reference Guide - Symantec Veritas⢠Cluster Server Bundled Agents Reference Guide - Symantec
158 VCS infrastructure and support agents RemoteGroup agent ■ ■ ■ The remote cluster is a two-node cluster, where remote1 and remote2 are the names of the two remote nodes. LocGrp is the local service group that contains the WebRes resource (for example: Apache, etc.) configured for the Web-server that runs in the local cluster. RemGrp is the remote service group that contains the DBRes resource (for example: MySQL or Oracle, etc.) configured for the database in the remote cluster. The database resource (DBRes) needs to come online before the Web server resource (WebRes) comes online. You can use the RemoteGroup agent to establish this inter-cluster application dependency. To configure the remotegroup agent for this setup 1 Create a RemoteGroup resource (RGRes) in the local service group (LocGrp) for monitoring or managing the DBRes resource in the remote cluster. 2 Link the resources such that the WebRes resource depends on the RGRes resource. 3 Set the attributes for the RemoteGroup resource (RGRes) as follows: ■ ■ ■ ■ ■ ■ IpAddress—Set to the IP address or DNS name of a node in the remote cluster. For this example, the value is remote1. You can also set this value as remote2 (second node in the remote cluster). The RemoteGroup agent keeps a list of remote nodes (remote1, remote2) on the local node. The IP address that you specify should be reachable the first time the RemoteGroup agent tries to communicate to the remote cluster. In case the specified IP address is not reachable after the first communication, the RemoteGroup agent talks to the second remote node to retrieve the state of RemGrp. GroupName—Set the value to RemGrp (the remote service group). VCSSysName—Set appropriate values so as to establish a one-to-one mapping between the systems in the local and remote clusters. RGRes will completely manage the remote service group (RemGrp) that contains the DBRes resource. Make this a local attribute for the RGRes. ControlMode—Set the value to OnOff. Username—Set the value to user_admin. The user needs to have administrative privileges for RemGrp. Password—Password for user_admin. You must encrypt the password using the VCS Encrypt command. See the VCS Administrator's Guide for more information on the VCS Encrypt utility.
VCS infrastructure and support agents RemoteGroup agent 159 ■ ■ VCSSysName@local1—Set this value to remote1. VCSSysName@local2—Set this value to remote2. You have to set the value of BrokerIp for a remote cluster that has the Symantec Product Authentication Service enabled. 4 Set the value of the AutoFailover attribute of the RemGrp to 0. This avoids unnecessary online or offline of the remote service group in case of a fail over. If the value of the VCSSysName attribute is ANY, then the value of the AutoFailover attribute of RemGrp should be 1. Service group behavior Consider the following actions to better understand the service group behavior in this configuration. ■ ■ ■ Bringing the LocGrp local service group online The Online functions of all the resources in LocGrp (local service group) are called starting from the lower-most resource on local1. In this configuration, WebRes depends on RGRes. The RGRes Online function is called before the WebRes Online function. In the Online function, the RemoteGroup agent communicates to the remote cluster and authenticates the specified user. The RemoteGroup agent brings RemGrp online on remote1. RemGrp is in an ONLINE state on remote1 and RGRes is in an ONLINE state on local1. The Online function of WebRes is then called. WebRes is now in an ONLINE state. Thus, you have established an application-level dependency across two different VCS clusters. The WebRes does not go online before the RGRes goes online. RGRes does not go online before the RemGrp goes online. An unexpected offline of the RemGrp remote service group LocGrp is online on the local1. WebRes and RGRes are both online on local1. RemGrp is online on remote1. If RemGrp faults on remote1, RGRes detects that RemGrp has gone OFFLINE or has FAULTED on remote1 and goes into a FAULTED state. All the resources in LocGrp are taken offline on local1. LocGrp now fails over to local2. All the resources including WebRes and RGRes go into an ONLINE state on local2. As part of the fail over of LocGrp on local2, RemGrp goes online on remote2. LocGrp shows ONLINE on node local2 and OFFLINE OR FAULTED on local1. Taking the LocGrp service group offline on local1 LocGrp is online on local1 and RemGrp is online on remote1. If you take LocGrp offline, all the resources dependent on RGRes are taken offline. First, the WebRes resource goes offline and then the offline for RGRes is called. As the ControlMode is OnOff, the RemoteGroup agent communicates to the remote cluster and issues an offline command for RemGrp. Once RemGrp has gone
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VCS infrastructure and support agents<br />
RemoteGroup agent<br />
159<br />
■<br />
■<br />
VCSSysName@local1—Set this value to remote1.<br />
VCSSysName@local2—Set this value to remote2.<br />
You have to set the value of BrokerIp for a remote cluster that has the<br />
Symantec Product Authentication Service enabled.<br />
4 Set the value of the AutoFailover attribute of the RemGrp to 0. This avoids<br />
unnecessary online or offline of the remote service group in case of a fail<br />
over. If the value of the VCSSysName attribute is ANY, then the value of the<br />
AutoFailover attribute of RemGrp should be 1.<br />
Service group behavior<br />
Consider the following actions to better understand the service group behavior<br />
in this configuration.<br />
■<br />
■<br />
■<br />
Bringing the LocGrp local service group online<br />
The Online functions of all the resources in LocGrp (local service group) are<br />
called starting from the lower-most resource on local1. In this configuration,<br />
WebRes depends on RGRes. The RGRes Online function is called before the<br />
WebRes Online function. In the Online function, the RemoteGroup agent<br />
communicates to the remote cluster and authenticates the specified user. The<br />
RemoteGroup agent brings RemGrp online on remote1. RemGrp is in an ONLINE<br />
state on remote1 and RGRes is in an ONLINE state on local1. The Online function<br />
of WebRes is then called. WebRes is now in an ONLINE state.<br />
Thus, you have established an application-level dependency across two different<br />
VCS clusters. The WebRes does not go online before the RGRes goes online.<br />
RGRes does not go online before the RemGrp goes online.<br />
An unexpected offline of the RemGrp remote service group<br />
LocGrp is online on the local1. WebRes and RGRes are both online on local1.<br />
RemGrp is online on remote1. If RemGrp faults on remote1, RGRes detects<br />
that RemGrp has gone OFFLINE or has FAULTED on remote1 and goes into a<br />
FAULTED state. All the resources in LocGrp are taken offline on local1. LocGrp<br />
now fails over to local2. All the resources including WebRes and RGRes go into<br />
an ONLINE state on local2. As part of the fail over of LocGrp on local2, RemGrp<br />
goes online on remote2. LocGrp shows ONLINE on node local2 and OFFLINE OR<br />
FAULTED on local1.<br />
Taking the LocGrp service group offline on local1<br />
LocGrp is online on local1 and RemGrp is online on remote1. If you take LocGrp<br />
offline, all the resources dependent on RGRes are taken offline. First, the<br />
WebRes resource goes offline and then the offline for RGRes is called. As the<br />
ControlMode is OnOff, the RemoteGroup agent communicates to the remote<br />
cluster and issues an offline command for RemGrp. Once RemGrp has gone
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