10.Send the certificate files to your z/OS instance via SSH by using the command in  Example 6-20. Note:  Consider this background information before you complete this step: GLYPH<SM590000> Our z/OS instance is  wtsc74.pbm.ihost.com  (not the zCX instance). GLYPH<SM590000> Our target folder under UNIX System Services (USS) is  /global/zcx/cfg/properties/ GLYPH<SM590000> Our z/OS privileged user is  zcxprv2 , which was defined earlier in this publication. Example 6-20 Sending certificate files to our z/OS instance mylinux:/tmp/certs #  scp docker_sc74cn03.pbm.ihost.com.*  zcxprv2@wtsc74.pbm.ihost.com:/global/zcx/cfg/properties/ The authenticity of host 'wtsc74.pbm.ihost.com (129.40.23.1)' can't be  established. RSA key fingerprint is SHA256:v27XurOE1iV0hnVzzsL4a3X97F9bH0McumDxFpE3Ogc. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'wtsc74.pbm.ihost.com,129.40.23.1' (RSA) to the list of  known hosts. zcxprv2@wtsc74.pbm.ihost.com's password:  docker_sc74cn03.pbm.ihost.com.crt 100% 2143 2.1KB/s 00:00 docker_sc74cn03.pbm.ihost.com.key 100% 3268 3.2KB/s 00:00 11.As a best practice for a private registry, we run the following commands to create a  persistent storage for  /var/lib/registry  and  /certs  folders: docker volume create certs_volume docker volume create registry_volume Note:  Chapter 10, “Persistent data” on page 233 gi ves an overview of concepts regarding  persistent data. 12.The next step is to upload the certificate files from Linux server to the zCX instance. Note:  Remember to use the private SSH key to access your zCX instance while using  admin user ID. We use the  id_rsa  key file that was created in Step 6, which is located in  /tmp/docker_images . Example 6-21 Sending certificate files to our zCX instance # Creating /home/admin/certs directory in your zCX instance mylinux:/tmp/certs #  ssh -p 8022 -i /tmp/docker_images/id_rsa admin@129.40.23.70  mkdir -p /home/admin/certs/ # Uploading images to the zCX instance mylinux:/tmp/certs #  scp -P 8022 -i /tmp/docker_images/id_rsa  /tmp/certs/docker_sc74cn03.pbm.ihost.com.* admin@129.40.23.70:/home/admin/certs/ docker_sc74cn03.pbm.ihost.com.crt 100% 2143 2.1KB/s 00:00 docker_sc74cn03.pbm.ihost.com.key 100% 3268 3.2KB/s 00:00 130  Getting started with z/OS Container Extensions