kubeadm init preflight check: kubeadm and etcd version mismatch
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$ kubeadm init --config tmp/master-configuration.yml
[init] Using Kubernetes version: v1.13.4
[preflight] Running pre-flight checks
[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 18.09.2. Latest validated version: 18.06
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
[ERROR ExternalEtcdVersion]: this version of kubeadm only supports external etcd version >= 3.2.18. Current version: 3.2.13
To update, it seems that simply installing the latest version of etcd has had no issues so far.
export ETCD_VERSION="v3.3.12"
I'm currently working on changes for Kubernetes v1.14.x. Expect an update within the next hour.
Changes: b8add28