Little bits of information someone might find useful, or not
The recent 1.6 release of Kubernetes strongly encourages switching etcd to etcd3. However, if you have an existing etcd2 cluster, the documentation CoreOS provides on upgrading it is less than helpful. Although it documents the upgrade procedure, it doesn’t tell you how to actually switch from running etcd2 to etcd3 – simply saying to drop in the new etcd3 binary in...
Containers are great, up until you need to persist storage beyond the potential lifetime of the container. In a single Dockerised setup, this might be easily solved through the use of host volumes but that’s not really a feasible method on larger orchestrated container setups such as Kubernetes. Luckily though, this is easily solved through the use of remote persistent volumes....
Whilst looking to spin up a new CoreOS VM to run Docker containers in, I noticed that they had added support for configuring cloud-config via VMware’s Guestinfo interface. In short, instead of putting your cloud-config in to an ISO an attaching it to the VM, you can embed it within the VM’s configuration file. To me, this seems like a far cleaner...
An easy fix here – assign more RAM to your VM! 512MB wasn’t enough for me, 1024MB was.
