Deploying ordering nodes Now, deploy the ordering service in your organization. 2. Confirm that the option to  Create an ordering service  is selected. Then, click  Next . 1. On the  Nodes  page, click  Add ordering service . 3. Give your ordering service a  Display name , and choose whether you want your ordering  service to have one node (sufficient for development and testing) or five nodes (good for  production). If you want to use an external CA, select it here.  Note:  To use an external CA, you must first build an MSP definition file that includes  certificates from the external CA. Then, import that file into the Organizations tab.  Click  Next . 4. On the next panel, select Ordering Service CA as your CA. Then, select the  enroll ID  for  the node identity that you created for your ordering service from the drop-down list, and  enter the associated  secret . Then, select your MSP from the drop-down list. 5. The next side panel asks for TLS CA information. When you created the CA, a TLS CA  was created alongside it. This CA is used to create certificates for the secure  communication layer for nodes. Therefore, in the drop-down list select the  enroll ID  for the  ordering service identity that you created, and enter its associated  secret . The TLS  Certificate Signing Request (CSR) hostname is an option for those who want to specify a  custom domain name that can be used to address the ordering service endpoint. Click  Next . 6. Configure resource allocation for the node. The selections that you make here are applied  to all five ordering nodes. If you want to learn more about how to allocate resources in IBM  Cloud for your node, see this topic in the IBM Knowledge Center:  https://cloud.ibm.com/docs/services/blockchain?topic=blockchain-ibp-console-gov ern#ibp-console-govern-allocate-resources 7. In the  Associate identity  step, you can choose an admin for your ordering service. Select  an admin and click  Next . 8. Review the  Summary page  and click  Add ordering service . Figure 4-36 confirms that the ordering service was successfully deployed. 184  Implementation Guide for IBM Blockchain Platform for Multicloud