Merge pull request #2 from manthang/patch-1

Add etcd upgrade lesson learned
cuongnv23 · Jul 6, 2018 · 1b223ec · 1b223ec
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diff --git a/README.md b/README.md
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 ## Lessons learned/problems/incidents when running Kubernetes
 
+- 2018 - Gravitational - The Horrors of Upgrading Etcd Beneath Kubernetes - https://gravitational.com/blog/kubernetes-and-offline-etcd-upgrades/
 
 ### Write-up