inspec/docs/resources/host.md.erb
hannah-radish 9cfc86d2ab Resource documentation update (#2207)
Light formatting changes, change order of example and matchers, slight
color changes

Signed-off-by: hannah-radish <hmaddy@chef.io>
2017-10-03 17:35:10 -04:00

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---
title: About the host Resource
---
# host
Use the `host` InSpec audit resource to test the name used to refer to a specific host and its availability, including the Internet protocols and ports over which that host name should be available.
<br>
## Syntax
A `host` resource block declares a host name, and then (depending on what is to be tested) a port and/or a protocol:
.. code-block:: ruby
describe host('example.com', port: 80, protocol: 'tcp') do
it { should be_reachable }
it { should be_resolvable }
its('ipaddress') { should include '12.34.56.78' }
end
where
* `host()` must specify a host name and may specify a port number and/or a protocol
* `'example.com'` is the host name
* `port:` is the port number
* `protocol: 'name'` is the Internet protocol: TCP (`protocol: 'tcp'`), UDP (`protocol: 'udp'` or ICMP (`protocol: 'icmp'`))
<br>
## Examples
The following examples show how to use this InSpec audit resource.
### Verify host name is reachable over a specific protocol and port number
describe host('example.com', port: 80, protocol: 'tcp') do
it { should be_reachable }
end
### Verify that a specific IP address can be resolved
describe host('example.com') do
it { should be_resolvable }
its('ipaddress') { should include '192.168.1.1' }
end
### Review the connection setup and socket contents when checking reachability
describe host('example.com', port: 12345, protocol: 'tcp') do
it { should be_reachable }
its('connection') { should_not match /connection refused/ }
its('socket') { should match /STATUS_OK/ }
end
<br>
## Matchers
This InSpec audit resource has the following matchers. For a full list of available matchers please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
### be_reachable
The `be_reachable` matcher tests if the host name is available:
it { should be_reachable }
### be_resolvable
The `be_resolvable` matcher tests for host name resolution, i.e. "resolvable to an IP address":
it { should be_resolvable }
### ipaddress
The `ipaddress` matcher tests if a host name is resolvable to a specific IP address:
its('ipaddress') { should include '93.184.216.34' }