I cannot select a host template when creating or modifying a host

Symptom

On the Configuration > Hosts > Hosts page, you are not able to select a host template when creating or modifying a host.

Possible issue #1

The plugin packs are not installed.

Solution

Follow this procedure to perform the plugin packs installation.

Possible issue #2

You have reached the maximum number of hosts that your license allows. This is the number of hosts on page Configuration > Hosts > Hosts, whether they are actually monitored or not.

Check

Follow this procedure to check how many hosts you have:

• Go to Configuration > Hosts > Hosts and check the number of hosts (the dropdown list at the top right of the page can give you the exact number).

• Log in to your Centreon server using SSH and run the following command:
  mysql -u root centreon MariaDB [centreon]> SELECT COUNT(host_id) FROM host WHERE host_register = '1';