1<a id="Service-apply-for-example"></a>Working with Apply for rules - tcp ports example 2============================================== 3 4This example wants to show you how to make use of `Apply For` rule for services. 5 6First you need to define a `tcp_ports` data field of type `Array` assigned to a `Host Template`. 7Refer to [Working with fields](14-Fields-example-interfaces-array.md) section to setup a data field. 8You also need to define a `tcp_port` data field of type `String`, we will associate it to a 9`Service Template` later. 10 11Then, please go to the `Dashboard` and choose the `Monitored services` dashlet: 12 13 14 15Then create a new `Service template` with check command `tcp`: 16 17 18 19Then associate the data field `tcp_port` to this `Service template`: 20 21 22 23Then create a new `apply-rule` for the `Service template`: 24 25 26 27Now define the `Apply For` property, select the previously defined field `tcp_ports` associated to 28the host template. `Apply For` rule define a variable `config` that can be used as `$config$`, it 29corresponds to the item of the array it will iterate on. 30 31Set the `Tcp port` property to `$config$`: 32 33 34 35(Side note: if you can't see your `tcp_ports` property in `Apply For` dropdown, try to create one 36host with a non-empty `tcp_ports` value.) 37 38That's it, now all your hosts defining a `tcp_ports` variable will be assigned the `Tcp Check` 39service. 40 41Have a look at the config preview, it will show you how `Apply For` services will look like once 42deployed: 43 44 45
