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HOWTO.md

File metadata and controls

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HOWTOs

A bunch of things I don't wanna have to look up later

Login to the dashboard

  1. ssh -L 10443:127.0.0.1:10443 piserver
  2. token=$(microk8s kubectl -n kube-system get secret | grep default-token | cut -d " " -f1)
  3. microk8s kubectl -n kube-system describe secret $token
  4. microk8s kubectl port-forward -n kube-system service/kubernetes-dashboard 10443:443
  5. open https://127.0.0.1:10443 in browser
  6. enter the token found therein

use etcdctl

Largely from https://github.com/coreos/etcd-operator/blob/master/doc/user/client_service.md

  1. kubectl -n etcd run --rm -i --tty etcdctl-test --image docker.io/library/etcd:v3.4.9 --restart=Never -- /bin/sh (note this is the LOCAL etcd image we created and added on each node)
  2. ETCDCTL_API=3 etcdctl --endpoints http://etcd-client:2379 <your etcd commands
  3. So for example: 
    ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 put foo bar
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client:2379 get foo
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client:2379 del foo
  4. OR if you want to use etcd from another namespace (this example should be apropos of coredns' service endpoint: 
    # note this is no longer in the etcd namespace
kubectl run --rm -i --tty fun --image docker.io/library/etcd:v3.4.9 --restart=Never -- /bin/sh
# now see the new url. The form is http://<cluster-name>-client.<cluster-namespace>.svc.cluster.local:2379
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 put foo bar
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 get foo
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 del foo

check on etcd entries for home

```
kubectl run --rm -i --tty fun --image docker.io/library/etcd:v3.4.9 --restart=Never -- /bin/sh
ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 get /skydns/com/example --prefix
```

add a non-kubernetes domain into coredns

Note: there's an error message about this in the logs that I need to figure out. I think "owner" needs to be added as well?

  1. connect to etcdctl.
  2. put json map with "host and ttl values in under a key /skydns/com/example/subdomain/host, i.e.: ETCDCTL_API=3 etcdctl --endpoints http://etcd-client.etcd.svc.cluster.local:2379 put /skydns/com/example/k8s/plex '{"host":"192.168.1.7","ttl":60}'

verify yoru postgres, or connect to it

  1. export POSTGRES_PASSWORD=<the password you used>
  2. kubectl run pgsql-postgresql-client --rm --tty -i --restart='Never' --namespace wiki --image arm64v8/postgres:12 --env="PGPASSWORD=$POSTGRES_PASSWORD" --command -- psql testdb --host postgres -U wiki -d wiki -p 5432