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Chapter 2 23

SCR Overview

Using Tags to Simplify Node Management

As you have already noticed, conﬁguration designations are long. It is

tedious to type them over and over, and it can be easy to mistype them.

SCR allows you to replace a conﬁguration designation with an easy to

use tag. There are two types of tags in SCR, system managed and user

deﬁned.

• System managed tags (oldest and latest) are used automatically to

indicate the oldest and latest conﬁguration for each node. These tags

are managed by the system and updated for you as needed.

• User deﬁned tags are used to represent other system conﬁguration

snapshots. If you tag a conﬁguration, SCR assumes it is important to

you and does not automatically delete it when it would expire. You

can delete the conﬁguration with scrdelete when you want to. You

can remove the tag with scrtag.

Use the scrtag command to create or use tags. For example, suppose the

node elsa has frequent conﬁguration changes lately, as shown below.

# scrhist

NODE TIME ERR TAG

elsa 02/07/1999 12:05 PST oldest

04/14/1999 13:05 PDT

04/15/1999 13:05 PDT

04/17/1999 13:05 PDT

04/18/1999 13:05 PDT latest

You can use the oldest and latest tags in future commands, instead of

typing the date and time they represent (02/07/1999 12:05 PST and

04/18/1999 13:05 PDT). You can also create tags to use as labels for the

other snapshots.

The following command generates the tag, StandardConﬁg, as a label

for the time, 199904171305.:

# scrtag –a elsa StandardConfig 199904171305

Then, the scrtag command generates a report that identiﬁes current

tags, similar to the following example.

# scrtag

NODE TAG TIME

elsa StandardConfig 04/17/1999 13:05 PDT

latest 04/18/1999 13:05 PDT

oldest 02/07/1999 12:05 PST

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