Kubernetes

How to access Pods externally

• http://alesnosek.com/blog/2017/02/14/accessing-kubernetes-pods-from-outside-of-the-cluster/

Disable some RBD features (or k8s will fail to launch pod)

• fast-diff
• object-map
• deep-flatten

must all be disabled

rbd feature disable ssd/elasticsearch-data-01 fast-diff object-map deep-flatten

RBD inside kubernetes

• https://github.com/kubernetes/examples/tree/master/staging/volumes/rbd

Spent some time toying around with it but couldn't get it to work - it is a must to add the secret as described here: https://github.com/kubernetes/examples/tree/master/staging/volumes/rbd#use-ceph-authentication-secret and also add that part to the manifest:

...
            user: admin
            keyring: /etc/ceph/ceph.client.admin.keyring
            secretRef:
              name: ceph-secret
...

Link to example rbd manifest: https://github.com/kubernetes/examples/blob/master/staging/volumes/rbd/rbd.yaml

Kube-dns - stub local DNS-servers with ip and zones

apiVersion: v1
kind: ConfigMap
metadata:
    name: kube-dns
    namespace: kube-system
data:
    stubDomains: |
        {"hq.skytech.dk": ["192.168.0.24", "10.0.0.24"]}