kubeadm fails at HEAD w/ Kubernetes 1.10 & 1.11: unsupported docker version: 18.09.6

[tstromberg]

HEAD now defaults to Docker 18.09. Because of this, we should turn off the Docker verification check for v1.10.x (preferred), or drop support for v1.10.x

Command:

make out/minikube; ./out/minikube start --vm-driver=virtualbox --kubernetes-version=v1.10.13

Output:

💣  Error starting cluster: kubeadm init: 
sudo /usr/bin/kubeadm init --config /var/lib/kubeadm.yaml  --ignore-preflight-errors=DirAvailable--etc-kubernetes-manifests --ignore-preflight-errors=DirAvailable--data-minikube --ignore-preflight-errors=Port-10250 --ignore-preflight-errors=FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml --ignore-preflight-errors=FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml --ignore-preflight-errors=FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml --ignore-preflight-errors=FileAvailable--etc-kubernetes-manifests-etcd.yaml --ignore-preflight-errors=Swap --ignore-preflight-errors=CRI 

[init] Using Kubernetes version: v1.10.13
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks.
[preflight] The system verification failed. Printing the output from the verification:
KERNEL_VERSION: 4.15.0
CONFIG_NAMESPACES: enabled
CONFIG_NET_NS: enabled
CONFIG_PID_NS: enabled
CONFIG_IPC_NS: enabled
CONFIG_UTS_NS: enabled
CONFIG_CGROUPS: enabled
CONFIG_CGROUP_CPUACCT: enabled
CONFIG_CGROUP_DEVICE: enabled
CONFIG_CGROUP_FREEZER: enabled
CONFIG_CGROUP_SCHED: enabled
CONFIG_CPUSETS: enabled
CONFIG_MEMCG: enabled
CONFIG_INET: enabled
CONFIG_EXT4_FS: enabled
CONFIG_PROC_FS: enabled
CONFIG_NETFILTER_XT_TARGET_REDIRECT: enabled (as module)
CONFIG_NETFILTER_XT_MATCH_COMMENT: enabled (as module)
CONFIG_OVERLAY_FS: enabled (as module)
CONFIG_AUFS_FS: not set - Required for aufs.
CONFIG_BLK_DEV_DM: enabled
DOCKER_VERSION: 18.09.6
OS: Linux
CGROUPS_CPU: enabled
CGROUPS_CPUACCT: enabled
CGROUPS_CPUSET: enabled
CGROUPS_DEVICES: enabled
CGROUPS_FREEZER: enabled
CGROUPS_MEMORY: enabled
	[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
	[WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'
Flag --admission-control has been deprecated, Use --enable-admission-plugins or --disable-admission-plugins instead. Will be removed in a future version.
[preflight] Some fatal errors occurred:
	[ERROR SystemVerification]: unsupported docker version: 18.09.6
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

Related: #4180 and #3323

[tstromberg]

Looks like v1.11.10 is also affected, so in keeping with our current policy of trying to support the last 5 minor versions, I'd rather workaround this than solve it by dropping support for older Kubernetes versions if possible.

[afbjorklund]

I saw the same thing with 1.12, --kubernetes-version=v1.12.8

The workaround was --extra-config kubeadm.ignore-preflight-errors=SystemVerification

[dpandhi-git]

can I work on it ?

[tstromberg]

@dpandhi-git - Sorry, didn't see this earlier. I've proposed a PR, do you mind taking a look at it?

Thank you for offering to help!

[dpandhi-git]

@tstromberg : Thanks Thomas for offering to check the issue . I am testing it locally to understand it better. As its closed now, I will look for another issues to contribute.