RHEL 7 Kubernetes Server Bootstrap Notes

RHEL7-Kubernetes-Setup-Notes

# Created By: glenn wolfe
# Email: wolfe.t.glenn@gmail.com

This gist pertains to some idiosyncracies of bootrapping your RHEL 7 server instance with a single or multi-cluster kubernetes network. 

The goal here was to simply aggregate the documentations resources you will need (including debugging) that will be required to get started. 

RHEL 7 - kubernetes startup 

Installing docker:

https://kubernetes.io/docs/setup/cri/#docker

Caviats:

(Error: Requires: container-selinux >= 2.9)

https://stackoverflow.com/questions/45272827/docker-ce-on-rhel-requires-container-selinux-2-9
- need to run  `subscription-manager repos --enable=rhel-7-server-extras-rpms` 
- Then, `yum update`

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Kubernets setup: 

https://kubernetes.io/docs/setup/independent/install-kubeadm/

Errors - disable swap: 
- `https://github.com/kubernetes/kubeadm/issues/610`
- `swapoff -a`


Init w/ Calico network Policy: 

- Need CRI (error)
- https://github.com/kubernetes/kubernetes/issues/54918
https://docs.projectcalico.org/v3.6/getting-started/kubernetes/


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Prometheus + Graphana (easy way) : 

https://github.com/giantswarm/prometheus

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Multinode Cluster: 

Joining remote master:
https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-token/#cmd-token-create

Errors: 

Assigning nodes to pods in YAML: 
https://kubernetes.io/docs/tasks/configure-pod-container/assign-pods-nodes/

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Label Nodes: 

Ex: https://stackoverflow.com/questions/48854905/how-to-add-roles-to-nodes-in-kubernetes

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Important Things to Note: 

Selinux Permissive Security Flaw! : (required for kubernetes)
https://docs.oracle.com/cd/E52668_01/E88884/html/requirements-selinux.html
https://access.redhat.com/security/cve/cve-2019-5736