code: func nodeHostsFileContent(hostsFilePath string, hostAliases []v1.HostAlias) ([]byte, error) {
  	hostsFileContent, err := ioutil.ReadFile(hostsFilePath)
  	if err != nil {
  		return nil, err
  	}
  	var buffer bytes.Buffer
  	buffer.WriteString(managedHostsHeaderWithHostNetwork)
  	buffer.Write(hostsFileContent)
  	buffer.Write(hostsEntriesFromHostAliases(hostAliases))
  	return buffer.Bytes(), nil
  }
docs: // nodeHostsFileContent reads the content of node's hosts file.