remove-node.yml exits unexpectedly with error: 'docker_bin_dir' is undefined

[minhdanh]

Is this a BUG REPORT or FEATURE REQUEST? (choose one): BUG REPORT

Environment:

• Cloud provider or hardware configuration: Digital Ocean

• OS (printf "$(uname -srm)\n$(cat /etc/os-release)\n"):

NAME="Ubuntu"
VERSION="16.04.4 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.4 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

• Version of Ansible (ansible --version): 2.5.0

Kubespray version (commit) (git rev-parse --short HEAD): d1b4ea5

Network plugin used: calico

Copy of your inventory file:

master1 ansible_host=x.x.x.x ip=10.130.83.129 ansible_user=root
master2 ansible_host=x.x.x.x ip=10.130.83.127 ansible_user=root
master3 ansible_host=x.x.x.x ip=10.130.83.128 ansible_user=root
etcd1 ansible_host=x.x.x.x ip=10.130.83.29 ansible_user=root
etcd2 ansible_host=x.x.x.x ip=10.130.83.30 ansible_user=root
etcd3 ansible_host=x.x.x.x ip=10.130.83.32 ansible_user=root
node1 ansible_host=x.x.x.x ip=10.130.83.136 ansible_user=root
node2 ansible_host=x.x.x.x ip=10.130.83.137 ansible_user=root
node3 ansible_host=x.x.x.x ip=10.130.83.133 ansible_user=root
node4 ansible_host=x.x.x.x ip=10.130.85.33 ansible_user=root

# ## configure a bastion host if your nodes are not directly reachable
# bastion ansible_host=x.x.x.x ansible_user=some_user

[kube-master]
master1
master2
master3

[etcd]
etcd1
etcd2
etcd3

[kube-node]
node4

# [kube-ingress]
# node2
# node3

[k8s-cluster:children]
kube-master
kube-node
# kube-ingress

Command used to invoke ansible: ansible-playbook -v -i inventory/mycluster/hosts.ini remove-node.yml

Output of ansible run: https://gist.github.com/minhdanh/c4c1fd44b69e80cafee4412956148ffc

Anything else do we need to know:
The ansible-playbook command to run remove-node.yml ends up with error: 'docker_bin_dir' is undefined

[riverzhang]

'docker_bin_dir' is undefined? The log 'bin_dir' is undefined.

[minhdanh]

Oh, those errors were being ignored, as you can see:

fatal: [master1]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'bin_dir' is undefined\n\nThe error appears to have been in 'kubespray/roles/remove-node/pre-remove/tasks/main.yml': line 3, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: remove-node | Drain node except daemonsets resource\n  ^ here\n"}
...ignoring

The error that caused ansible-playbook to exit was:

TASK [reset : reset | remove all containers] ********************************************************
Tuesday 24 April 2018  17:10:09 +0700 (0:00:00.043)       0:00:14.365 *********
fatal: [node4]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'docker_bin_dir' is undefined\n\nThe error appears to have been in 'kubespray/roles/reset/tasks/main.yml': line 46, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: reset | remove all containers\n  ^ here\n"}
        to retry, use: --limit @kubespray/remove-node.retry