Can't install kubespray

Organization Name:

Short summary about the issue/question:
fatal: [openpai-master-01 -> 172.168.3.103]: FAILED! => {"changed": false, "cmd": "/usr/bin/rsync --delay-updates -1.15.11-amd64 /usr/local/bin/kubectl", "msg": "rsync: link_stat \"/tmp/releases/hyperkube-v1.15.11-amd64\" failed: ious errors) (code 23) at main.c(1196) [sender=3.1.2]\n", "rc": 23}
Brief what process you are following:
I am following this #4614 to deploy OpenPAI on a single node (OS: Ubuntu 18.04), I use ansible-playbook -i inventory/pai/hosts.yml cluster.yml --become --become-user=root -e "@inventory/pai/openpai.yml" , and I meet some problems that I did not encounter on the computer with the OS Ubuntu16.04.

Error Log:

 [WARNING]:  * Failed to parse /home/xxx/kubespray/inventory/pai/hosts.yml with yaml plugin: 'NoneType' object is not iterable

 [WARNING]:  * Failed to parse /home/xxx/kubespray/inventory/pai/hosts.yml with ini plugin: /home/xxx/kubespray/inventory/pai/hosts.yml:4: Expected key=value host variable assignment, got: 172.168.3.103

 [WARNING]:  * Failed to parse /home/xxx/kubespray/inventory/pai/hosts.yml with auto plugin: no root 'plugin' key found, '/home/xxx/kubespray/inventory/pai/hosts.yml' is not a valid YAML inventory plugin
config file

 [WARNING]: Unable to parse /home/xxx/kubespray/inventory/pai/hosts.yml as an inventory source

 [WARNING]: No inventory was parsed, only implicit localhost is available


PLAY [localhost] *********************************************************************************************************************************************************************************************

TASK [Check ansible version >=2.7.8] *************************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.060)       0:00:00.060 ******
ok: [localhost] => {
    "changed": false,
    "msg": "All assertions passed"
}
 [WARNING]: Could not match supplied host pattern, ignoring: bastion


PLAY [bastion[0]] ********************************************************************************************************************************************************************************************
skipping: no hosts matched
 [WARNING]: Could not match supplied host pattern, ignoring: k8s-cluster

 [WARNING]: Could not match supplied host pattern, ignoring: etcd


PLAY [k8s-cluster:etcd] **************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY [k8s-cluster:etcd] **************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY [etcd] **************************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY [k8s-cluster] *******************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY [k8s-cluster] *******************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY [kube-master] *******************************************************************************************************************************************************************************************

TASK [download : prep_download | Set a few facts] ************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.128)       0:00:00.189 ******

TASK [download : Set image info command for containerd] ******************************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.059)       0:00:00.248 ******

TASK [download : Register docker images info] ****************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.059)       0:00:00.307 ******

TASK [download : prep_download | Create staging directory on remote node] ************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.060)       0:00:00.367 ******

TASK [download : prep_download | Create local cache for files and images] ************************************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.060)       0:00:00.427 ******

TASK [download : prep_download | On localhost, check if passwordless root is possible] ***********************************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.064)       0:00:00.492 ******

TASK [download : prep_download | On localhost, check if user has access to docker without using sudo] ********************************************************************************************************
Thursday 22 October 2020  15:57:39 +0800 (0:00:00.059)       0:00:00.552 ******

TASK [download : prep_download | Parse the outputs of the previous commands] *********************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.060)       0:00:00.613 ******

TASK [download : prep_download | Check that local user is in group or can become root] ***********************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.057)       0:00:00.670 ******

TASK [download : Use cri-o for cri connection] ***************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.058)       0:00:00.729 ******

TASK [download : Use containerd for cri connetion] ***********************************************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.057)       0:00:00.786 ******

TASK [download : Use docker for cri connetion] ***************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.058)       0:00:00.844 ******
ok: [openpai-master-01]

TASK [download : include_tasks] ******************************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.089)       0:00:00.933 ******

TASK [download : download | Get kubeadm binary and list of required images] **********************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.059)       0:00:00.993 ******

TASK [download : download | Download files / images] *********************************************************************************************************************************************************
Thursday 22 October 2020  15:57:40 +0800 (0:00:00.058)       0:00:01.051 ******

TASK [download : download | Sync files / images from ansible host to nodes] **********************************************************************************************************************************
Thursday 22 October 2020  15:57:41 +0800 (0:00:00.685)       0:00:01.737 ******

TASK [kubespray-defaults : Configure defaults] ***************************************************************************************************************************************************************
Thursday 22 October 2020  15:57:41 +0800 (0:00:00.608)       0:00:02.345 ******
ok: [openpai-master-01] => {
    "msg": "Check roles/kubespray-defaults/defaults/main.yml"
}

TASK [kubernetes/tokens : Check_tokens | check if the tokens have already been generated on first master] ****************************************************************************************************
Thursday 22 October 2020  15:57:41 +0800 (0:00:00.110)       0:00:02.456 ******

TASK [kubernetes/tokens : Check_tokens | Set default value for 'sync_tokens' and 'gen_tokens' to false] ******************************************************************************************************
Thursday 22 October 2020  15:57:41 +0800 (0:00:00.055)       0:00:02.511 ******

TASK [kubernetes/tokens : Check_tokens | Set 'sync_tokens' and 'gen_tokens' to true] *************************************************************************************************************************
Thursday 22 October 2020  15:57:41 +0800 (0:00:00.055)       0:00:02.566 ******

TASK [kubernetes/tokens : Check tokens | check if a cert already exists] *************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.056)       0:00:02.622 ******

TASK [kubernetes/tokens : Check_tokens | Set 'sync_tokens' to true] ******************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.057)       0:00:02.679 ******

TASK [kubernetes/tokens : Make sure the tokens directory exits] **********************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.058)       0:00:02.738 ******

TASK [kubernetes/tokens : Gen_tokens | copy tokens generation script] ****************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.093)       0:00:02.831 ******

TASK [kubernetes/tokens : Gen_tokens | generate tokens for master components] ********************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.087)       0:00:02.919 ******

TASK [kubernetes/tokens : Gen_tokens | generate tokens for node components] **********************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.093)       0:00:03.012 ******

TASK [kubernetes/tokens : Gen_tokens | Get list of tokens from first master] *********************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.093)       0:00:03.106 ******

TASK [kubernetes/tokens : Gen_tokens | Gather tokens] ********************************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.088)       0:00:03.194 ******

TASK [kubernetes/tokens : Gen_tokens | Copy tokens on masters] ***********************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.060)       0:00:03.255 ******

TASK [kubernetes/master : Pre-upgrade | Delete master manifests if etcd secrets changed] *********************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.057)       0:00:03.312 ******

TASK [kubernetes/master : Pre-upgrade | Delete master containers forcefully] *********************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.083)       0:00:03.396 ******

TASK [kubernetes/master : Make sure the users directory exits] ***********************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.084)       0:00:03.481 ******

TASK [kubernetes/master : Populate users for basic auth in API] **********************************************************************************************************************************************
Thursday 22 October 2020  15:57:42 +0800 (0:00:00.061)       0:00:03.542 ******

TASK [kubernetes/master : Create webhook token auth config] **************************************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.066)       0:00:03.609 ******

TASK [kubernetes/master : Check if secret for encrypting data at rest already exist] *************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.068)       0:00:03.678 ******

TASK [kubernetes/master : Slurp secrets_encryption file if it exists] ****************************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.063)       0:00:03.741 ******

TASK [kubernetes/master : Base 64 Decode slurped secrets_encryption.yaml file] *******************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.068)       0:00:03.809 ******

TASK [kubernetes/master : Extract secret value from secrets_encryption.yaml] *********************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.064)       0:00:03.874 ******

TASK [kubernetes/master : Set kube_encrypt_token across master nodes] ****************************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.105)       0:00:03.979 ******

TASK [kubernetes/master : Write secrets for encrypting secret data at rest] **********************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.071)       0:00:04.051 ******

TASK [kubernetes/master : Install | Copy kubectl binary from download dir] ***********************************************************************************************************************************
Thursday 22 October 2020  15:57:43 +0800 (0:00:00.106)       0:00:04.157 ******
fatal: [openpai-master-01 -> xxx.xxx.x.xxx]: FAILED! => {"changed": false, "cmd": "/usr/bin/rsync --delay-updates -F --archive --no-owner --no-group --out-format=<<CHANGED>>%i %n%L /tmp/releases/hyperkube-v1.15.11-amd64 /usr/local/bin/kubectl", "msg": "rsync: link_stat \"/tmp/releases/hyperkube-v1.15.11-amd64\" failed: No such file or directory (2)\nrsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1196) [sender=3.1.2]\n", "rc": 23}

OpenPAI Environment:

• OpenPAI version: v1.0.1
• Phyical machine
• OS (e.g. from /etc/os-release): Ubuntu 18.04.2
• Kernel (e.g. uname -a): Linux 4.18.0-15-generic x86_64
• Hardware (e.g. core number, memory size, storage size, GPU type etc.): nvidia Tesla M60