Linking templates to hosts

Now we'd like to link this template to our very first host, A test host. First, let's compare item lists between the freshly-created template and that host:

1. Open Configuration | Hosts in one browser window or tab and Configuration | Templates in another.
2. In the first window, choose Linux servers in the Group drop-down, then click on Items next to A test host.

3. In the other one, select Custom templates in the Group drop-down, then click on Items next to C_Template_Linux. Place the windows next to each other and compare the listings:

We can see that the template has three more items than the host. Looking at the lists on the left side of the screenshot and the right, we can see that items available on the template (right) but not on the host (left) are both SNMP-related items that we added later, experimental SNMP trap and snmptraps, the local time item, and also the check for a file, Testfile, exists. If the template has four items that the host is missing, but in total...