# Mapping Hostnames to a Group

# Introduction

Configure license-host-mapping to map hostnames to a group.

Apply the configurations shown in the Open iT server.

Open license-host-mapping in the Configuration directory, which is by default in C:\Program Files\OpeniT\Core\Configuration.

Notice that it contains instructions on how to edit the file.
Specify host names with the following syntax:
```
MAP: HostGroupName
Hostname1
Hostname2
```
Empty lines are allowed — any line beginning with # as the first non-white character is considered a comment. Globbing is also supported. You can use several globbing patterns, but keep in mind that they are slower than exact matches.

In the mapping file, entries are case-insensitive. This means that variations in capitalization, such as 'Host' and 'host', will be recognized as identical. Also, both leading and trailing spaces are removed from entries.

Each host can be a member of only one group. A host that appears in multiple mappings will always be mapped to its first occurrence in the file.
Example
```
MAP: HostGroup1    
Host1028
Host0232
```
This example maps Host1028 and Host0232 to HostGroup1.
Save the changes.

The mapping file will only affect the data collected after configuring. To apply the mapping for historical data, you need to regenerate that data. This process will help ensure that all your information is aligned and accurate.

Open license-host-mapping in the etc directory, which is by default in /var/opt/openit/etc.

Notice that it contains instructions on how to edit the file.
Specify host names with the following syntax:
```
MAP: HostGroupName
Hostname1
Hostname2
```
Empty lines are allowed — any line beginning with # as the first non-white character is considered a comment. Globbing is also supported. You can use several globbing patterns, but keep in mind that they are slower than exact matches.

In the mapping file, entries are case-insensitive. This means that variations in capitalization, such as 'Host' and 'host', will be recognized as identical. Also, both leading and trailing spaces are removed from entries.

Each host can be a member of only one group. A host that appears in multiple mappings will always be mapped to its first occurrence in the file.
Example
```
MAP: HostGroup1    
Host1028
Host0232
```
This example maps Host1028 and Host0232 to HostGroup1.
Save the changes.

The mapping file will only affect the data collected after configuring. To apply the mapping for historical data, you need to regenerate that data. This process will help ensure that all your information is aligned and accurate.

Proceed with data regeneration after configuring all the necessary mapping files to apply the changes in the historical reports: