(New) Managing Host Groups

Host groups allow you to configure host data ingestion efficiently. You can add multiple hosts to a host group and associate the host group with ingestion configurations. The ingestion configurations will then be applied to all the hosts in the host group. When there is a new host, simply add it to a host group and the host will automatically inherit the log ingestion configurations associated with the host group.

You can create host groups of the IP address and custom identifier types.

Host Group Type set to IP: Select hosts of the IP address type and add them to the host group.
Host Group Type set to Custom Identifier: You need to create identifiers for each host group and host. Hosts with an identifier will automatically be included in the corresponding host group sharing that identifier.

Constraints

To use the new host group management function, switch to the new access center. To go to the old host group management page, choose Access Center > Access Center in the navigation pane on the left and then click Back to Old Version in the upper right corner. The host group function (new) is not generally available. To use it, submit a service ticket.

Creating a Host Group (IP Address)

Log in to the AOM 2.0 console.
In the navigation pane, choose Settings > Global Settings.
On the Global Settings page, choose Collection Settings > Host Groups and click Create Host Group in the upper left corner.

On the displayed page, set the host group parameters.

**Table 1** Parameters
Parameter	Description	Example
Host Group	Name of a host group. Enter 1 to 64 characters. Do not start with a period (.) or underscore (_) or end with a period. Only letters, digits, hyphens (-), underscores, and periods are allowed.	IPHostGroup1
Host Group Type	Type of the host group. Options: IP and Custom Identifier. In this example, select IP.	IP
Host Type	Host type. Default: Linux.	Linux
Remark	Host group remarks. Enter up to 1,024 characters.	-

Figure 1 Creating an IP address host group

In the host list, select one or more hosts to add to the group and click OK.
- You can filter hosts by host name/ID or private IP address. You can also click and enter multiple host IP addresses in the displayed search box to search.
- If your desired hosts are not in the list, click Install UniAgent. On the displayed page, install UniAgents on the hosts as prompted. For details, see (New) Installing UniAgents.
- When the selected hosts do not have UniAgent installed but have an earlier version of ICAgent installed, an upgrade prompt appears. To enable automatic UniAgent installation later, click Upgrade to first upgrade ICAgent to the latest version.
- If the selected hosts do not have both UniAgent and ICAgent installed (either UniAgent or ICAgent is in the Not installed state), click OK. A dialog box will pop up, indicating the missing UniAgent or ICAgent and the number of hosts without UniAgent or ICAgent installed.
  - When selecting an ECS, click OK in the dialog box. The system will then issue a task for automatically installing either UniAgent or ICAgent. Otherwise, the host cannot be added to the host group.
  - When selecting a host of the Other type, manually install UniAgent and ICAgent first. Otherwise, the host cannot be added to the host group. For details, see (New) Installing UniAgents.
- Click in the upper right corner of the host list to manually refresh the list.

Creating a Host Group (Custom Identifier)

Log in to the AOM 2.0 console.
In the navigation pane on the left, choose Settings > Global Settings. On the displayed page, choose Collection Settings > Host Groups and click Create Host Group in the upper left corner.

On the displayed page, set the host group parameters.

**Table 2** Parameters
Parameter	Description	Example
Host Group	Name of a host group. Enter 1 to 64 characters. Do not start with a period (.) or underscore (_) or end with a period. Only letters, digits, hyphens (-), underscores, and periods are allowed.	HostGroup
Host Group Type	Type of the host group. Options: IP and Custom Identifier. In this example, select Custom Identifier.	Custom Identifier
Host Type	Host type. Default: Linux.	Linux
Remark	Host group remarks. Enter up to 1,024 characters.	-
Custom Identifier	Click Add to add a custom identifier. Max.: 128 characters. Only letters, digits, underscores (_), and hyphens (-) are allowed. Up to 10 custom identifiers can be added.	aom

Figure 2 Creating a custom identifier host group

Click OK. After the host group is created, add hosts to it by referring to 5.

Log in to the host and perform the following operations as the root user to create the custom_tag file for storing host tags.

Run the cd /opt/cloud command.
- If the /opt/cloud directory already exists, navigate to it and run the mkdir lts command to create the lts directory in it.
- If the /opt/cloud directory does not exist, run the mkdir /opt/cloud/ command to create it and enter it, and then run the mkdir lts command to create the lts directory.
Run the chmod 750 lts command to modify the permission on the lts directory.
Run the touch custom_tag command in the lts directory to create the custom_tag file.
Run the chmod 640 custom_tag;vi custom_tag command to modify the custom_tag file permission and open the file.
Press i to enter the insert mode, enter a custom identifier, press Esc, enter :wq!, save the modification and exit.

Use either of the following methods to add a host to the custom identifier host group:

**Table 3** Methods
Type	Method 1 (Recommended)	Method 2
Linux host	View the host identifier in the custom_tag file under the /opt/cloud/lts directory of the host. On the host group configuration page, add the host identifier as the custom identifier for the host group to include the host in that group. For example, in the custom_tag file of the /opt/cloud/lts directory on the host, the identifier of the host is test1, and the custom identifier of the host group is set to test1. In this way, the host is added to the host group.	Configure a custom identifier before creating a host group. Add the custom identifier to the custom_tag file in the /opt/cloud/lts directory of the host. The host can then be added to the specified host group. For example, if the custom identifier of the host group is set to test during host group creation, enter test in the custom_tag file to add the host to the host group. If multiple custom identifiers are added, enter any custom identifier in the custom_tag file of the /opt/cloud/lts directory on the host to add the host to the host group.

Other Operations

You can change a created host group, add hosts to or remove hosts from a host group, or associate a host group with log ingestion configurations.

**Table 4** Operations on host groups
Operation	Procedure
Changing a host group	Locate the target host group and click in the Operation column. On the displayed dialog box, modify the information such as the host group name, custom identifier, and remark. Click OK.
Adding hosts to a host group	Click next to the target IP address host group. Click Add Host. In the displayed slide-out panel, all hosts that are not in the host group and run the selected OS type are displayed. Select the hosts to be added to the host group. For details, see 5. You can filter hosts by host name/ID or private IP address. You can also click and enter multiple host IP addresses in the displayed search box to search. If your desired hosts are not in the list, click Install UniAgent. On the displayed page, install UniAgents on the hosts as prompted. For details, see (New) Installing UniAgents. Click OK. This operation is not supported for hosts in a custom identifier host group. To add hosts to a custom identifier host group, refer to 5.
Removing a host from a host group	Click next to the target IP address host group. Locate the target host and click Remove in the Operation column. In the displayed dialog box, click OK. This operation is not supported for hosts in a custom identifier host group.
Removing hosts in batches	Locate the target host group and click next to it. Select the target hosts and click Remove above the list. Click OK. This operation is not supported for hosts in a custom identifier host group.
Viewing log ingestion rules	Locate the target host group and click next to it. Click the Associated Ingestion Configurations tab to view the log ingestion rules configured for the host group. For how to configure log ingestion rules for the host group, see Managing Metric and Log Ingestion.
Viewing metric access rules	Locate the target host group and click next to it. Click the Metric Access Rules tab to view the metric access rules configured for the host group. For how to configure metric ingestion rules for the host group, see Managing Metric and Log Ingestion.
Associating a host group with an ingestion configuration	Locate the target host group and click next to it. Click the Associated Ingestion Configurations tab and then click Associate. In the displayed slide-out panel, select the target ingestion configuration. Click OK. The associated ingestion configuration is displayed in the list.
Disassociating a host group from an ingestion configuration	Click the Associated Ingestion Configurations tab, locate the target ingestion configuration, and then click Disassociate in the Operation column. Click OK.
Disassociating a host group from multiple ingestion configurations	Click the Associated Ingestion Configurations tab, select target ingestion configurations, and then click Disassociate above the list. Click OK.
Copying host group information	Hover your cursor over a host group name to copy a host group ID.
Deleting a host group	Locate the target host group and click in the Operation column. In the displayed dialog box, click OK.
Deleting host groups in batches	Select multiple host groups to be deleted and click Delete above the list. In the displayed dialog box, click OK.
Managing tags	Tag log groups as required. Locate the target host group and click in the Operation column. On the displayed page, enter a tag key and value. Precautions: To add more tags, repeat the preceding step. To delete a tag, locate the target host group and click in the Operation column. On the displayed page, locate the target tag and click in the Operation column. A tag key can contain up to 128 characters, and a tag value can contain up to 255 characters. A tag key must be unique.