IBM Cloud Private 3.1.0 - "Failed to connect to the host via ssh: Permission denied (publickey,password)."

During the installation of the most recent version of IBM Cloud Private (ICP), namely 3.1.0, I ran the main setup/installation command: -

sudo docker run --net=host -t -e LICENSE=accept -v "$(pwd)":/installer/cluster ibmcom/icp-inception-amd64:3.1.0-ee install

which immediately failed with: -

...

PLAY [Checking Python interpreter] *******************************************************************************************************************************************************************************

TASK [Checking Python interpreter] *******************************************************************************************************************************************************************************
fatal: [192.168.1.122]: UNREACHABLE! => changed=false 
  msg: |-
    Failed to connect to the host via ssh: Permission denied (publickey,password).
  unreachable: true
fatal: [192.168.1.121]: UNREACHABLE! => changed=false 
  msg: |-
    Failed to connect to the host via ssh: Permission denied (publickey,password).
  unreachable: true
fatal: [192.168.1.123]: UNREACHABLE! => changed=false 
  msg: |-
    Failed to connect to the host via ssh: Permission denied (publickey,password).
  unreachable: true

NO MORE HOSTS LEFT ***********************************************************************************************************************************************************************************************

NO MORE HOSTS LEFT ***********************************************************************************************************************************************************************************************

PLAY RECAP *******************************************************************************************************************************************************************************************************
192.168.1.121              : ok=0    changed=0    unreachable=1    failed=0   
192.168.1.122              : ok=0    changed=0    unreachable=1    failed=0   
192.168.1.123              : ok=0    changed=0    unreachable=1    failed=0   

Playbook run took 0 days, 0 hours, 0 minutes, 0 seconds
…

I'm using this: -

Installing IBM® Cloud Private either Cloud Native or Enterprise

and this: -

Customizing your installation

and this: -

Customizing the cluster with the config.yaml file

for inspiration.

For the record, I'm running the installation as a non-root user - hayd - but the installation does leverage the sudo command, which is fine.

Also, I had previously exchanged SSL keys between the three VMs that make up my cluster - master, worker and proxy - and was able to do "password-less" login between each of them: -

ssh hayd@icpmaster

ssh hayd@icpworker

ssh hayd@icpproxy

and yet the issue appeared to be permissions-related: -

…

    Failed to connect to the host via ssh: Permission denied (publickey,password).

...

specifically with this file: -

-r-------- 1 root root 3243 Oct 26 12:25 /opt/ibm-cloud-private-3.1.0/cluster/ssh_key

I even tried hacking the permissions: -

chmod 777 /opt/ibm-cloud-private-3.1.0/cluster/ssh_key

( don't hate me, this is my own private VM, running on Beast in my home lab )

but to no avail.

I then focused further upon the documentation, specifically this: -

Customizing the cluster with the config.yaml file

and tried setting the ansible_user etc.

ansible_user: hayd
ansible_become: true
ansible_become_password: passw0rd

This seems to defeat the point of the password-less login, so I need to think about this more BUT it works.

For now at least …...