## 4.10 Log on to the zCX instance 

This section describes how to log on to the zCX instance where you can use ssh. Here is the procedure that we followed: 

1. Log on to the USS environment of z/OS using the RACF administrator user ID that you created in 4.2.5, “Create RACF user IDs” on page 52. We logged on to USS by using ZCXADM1. 

2. Enter this command to log on to the zCXinstance: ssh admin@sc74cn01.pbm.ihost.com -p 8022 

For this first logon, you get the response shown in Example 4-20. 

The authenticity of host '[sc74cn01.pbm.ihost.com]:8022 ([129.40.23.68]:8022)' can't be established. ECDSA key fingerprint is SHA256:IA5Sw4oNK7wODhFGkH4ayyJNvT73m1uvQprHjqOC41M. Are you sure you want to continue connecting (yes/no)? 

You can disregard the warning message about the authenticity of the host, as this is expected ssh behavior. Respond ‘yes’ to the prompt, and press Enter . The logon should be complete and shows output similar to that in Example 4-21. 

FOTS2274 Warning: Permanently added '[sc74cn01.pbm.ihost.com]:8022,[129.40.23.68]:8022' (ECDSA) to the list of known hosts. Welcome to the IBM z/OS Container Extensions (IBM zCX) shell that provides access to Docker commands. For more information on how to use this shell to execute Docker commands refer to "IBM z/OS Container Extensions Guide". Sudo only permits specific User Management functions. See additional documentation for details. admin@d377e12aa94b:~$ id uid=1001(admin) gid=1001(admin) groups=1001(admin),27(sudo),109(docker) 

3. Issue the id command to confirm that the user ID we have logged in to the zCX instance as is called admin . This was the value that we set for the property ZCX_DOCKER_ADMIN as described in 4.7.1, “Customizing the properties file” on page 60. 

Now that you are logged in to the zCX instance, you can follow the steps in Chapter 5., “Your first running Docker container in zCX” on page 97 to create and run your first Docker containers. 

## 4.11 Reconfiguring a zCX instance 

In this section, we describe how to reconfigure an existing zCX instance to change settings such as number of virtual CPs and memory size. 

