# k8s

This folder holds all the services required for my private infrastructure. Following contraints apply:

* Order of implementation is top down.
* Every namespace has a subfolder within this subdirectory.
* helm3

# Operations

Cleanup `Error` pods.

```sh
kubectl get pods | grep Error | cut -d' ' -f 1 | xargs kubectl delete pod
```

Redeploy a deployment:

```sh
DEPLOYMENT="rstudio"
NAMESPACE="datalab"
kubectl patch deployment $DEPLOYMENT -n $NAMESPACE -p "{\"spec\": {\"template\": {\"metadata\": { \"labels\": {  \"redeploy\": \"$( date +%s )\"}}}}}"
```

# Deployment

## namespaces

DEPRECATED. Namespaces shall be created for the specific service.

```sh
namespaces="flux cert-manager nginx-ingress infrapuzzle kuard auth nextcloud datalab web development tt-rss backup monitoring nextcloud mailu"
for i in $( echo $NAMESPACES ) ; do
  k create ns $i
done
```

## helm repositories


DEPRECATED. Helm repo will be listed for the individual apps.

```sh
helm repo add stable https://kubernetes-charts.storage.googleapis.com
helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo add k8s-land https://charts.k8s.land
helm repo add mailu https://mailu.github.io/helm-charts/
helm repo update
```

## [ingress-controller](https://github.com/helm/charts/tree/master/stable/nginx-ingress)

Apply with helm:

```bash
helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update
helm upgrade --install --create-namespace ingress-nginx ingress-nginx/ingress-nginx -n ingress-nginx -f ingress-nginx/ingress-nginx.yaml
```

## [cert-manager](https://cert-manager.io/docs/tutorials/acme/ingress/)

Apply with helm. [See chart.](https://github.com/jetstack/cert-manager):

```bash
helm repo add jetstack https://charts.jetstack.io
helm repo update
helm upgrade --install --create-namespace cert-manager jetstack/cert-manager -n cert-manager -f cert-manager/cert-manager.yaml
# this is required:
kubectl apply -f cert-manager/staging-issuer.yaml
kubectl apply -f cert-manager/production-issuer.yaml
```

To test all this you may use the kuaard demo project:

```sh
$ kubectl apply -f kuard
# checkout: https://kuard.haumdaucher.de
$ kubectl delete -f kuard
```

## openebs

Update with the follwoing command. Chart can be found [here](https://github.com/openebs/charts/tree/master/charts/openebs).

```sh
helm repo add openebs https://openebs.github.io/charts
helm repo update
helm upgrade --install -f openebs/openebs.yml openebs --namespace openebs openebs/openebs
```

## minio

See [chart on GitHub](https://github.com/minio/charts/tree/master/minio).

```sh
helm repo add minio https://helm.min.io/
helm repo update
helm upgrade --install -f minio/minio.secret.yaml --namespace minio --create-namespace minio minio/minio
# #
helm delete minio -n minio
kubectl delete ns minio
```

## velero

Backup tool. See chart [README](https://github.com/vmware-tanzu/helm-charts/blob/main/charts/velero/README.md).

```sh
helm repo add vmware-tanzu https://vmware-tanzu.github.io/helm-charts
helm repo update
helm upgrade --install --create-namespace --namespace velero -f ./velero/velero.secret.yaml velero vmware-tanzu/velero
# #
helm delete velero -n velero
kubectl delete ns velero
```

A backup may be created using:

```sh
velero backup create full-backup --default-volumes-to-restic --include-namespaces datalab,development,nextcloud,tt-rss,zebrium --wait
```

## Add private docker registry

```sh
# create secret base64 encoded and put it in htpasswd helm chart
USER='moritz'
PASSWORD='xxx'
docker run --entrypoint htpasswd --rm registry:2 -Bbn $USER $PASSWORD
# #
helm upgrade --install docker-registry stable/docker-registry -n development -f development/registry.secret.yaml
##kubectl apply -f development/registry.secret.yaml
```

### creating docker-pull-secret

Create credentials secret [according to docu](https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/#create-a-secret-by-providing-credentials-on-the-command-line):

```sh
namespaces="datalab"
for i in $( echo $namespaces ) ; do
  kubectl create secret docker-registry registry-haumdaucher-de \
    -n $i \
    --docker-server=registry.haumdaucher.de \
    --docker-username=moritz \
    --docker-password='xxx' \
    --docker-email=moritz@moritzgraf.de \
    --dry-run -o yaml > ./${i}/docker-pull.yaml.secret
done
# apply
for i in $( echo $namespaces ) ; do
  kubectl apply -f ${i}/docker-pull.yaml.secret
done
```

## networking with calico

Install calicoctl in cluster

```sh
kubectl apply -n kube-system -f https://docs.projectcalico.org/manifests/calicoctl.yaml
```

Then you may send commands like:

```sh
kubectl exec -ti -n kube-system calicoctl -- /calicoctl get workloadendpoints -n mailu
```

Or on the server directly:

```sh
sudo -E /usr/local/bin/calicoctl node checksystem
```

### metrics

See this [documentation](https://docs.projectcalico.org/maintenance/monitor-component-metrics).

```sh
kubectl exec -ti -n kube-system calicoctl -- /calicoctl patch felixConfiguration default  --patch '{"spec":{"prometheusMetricsEnabled": true}}'
kubectl apply -n kube-system -f - <<EOF
apiVersion: v1
kind: Service
metadata:
  name: felix-metrics-svc
  namespace: kube-system
spec:
  selector:
    k8s-app: calico-node
  ports:
  - port: 9091
    targetPort: 9091
EOF

```

## metrics-server

```sh
helm upgrade --install -f kube-system/metrics-server.yaml metrics-server -n kube-system stable/metrics-server
```

## rstudio

Currently only for one user:

```sh
kubectl apply -f datalab/rstudio.yaml
```

## tt-rss

Includes *persistent data* from mariadb table `tt-rss`.

```sh
helm upgrade --install tt-rss-mariadb bitnami/mariadb -n tt-rss -f tt-rss/tt-rss-mariadb.secret.yml
helm upgrade --install tt-rss-phpmyadmin bitnami/phpmyadmin -n tt-rss -f tt-rss/tt-rss-phpmyadmin.yml
kubectl apply -f tt-rss/
```

## monitoring

The prometheus-operator, now called [kube-prometheus-stack](https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack) is used.

```sh
kubectl create ns monitoring
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update
helm upgrade --install prometheus-operator prometheus-community/kube-prometheus-stack -n monitoring -f monitoring/prometheus-operator.secret.yml
```

## gitea

In case my PRs have been accepted this is no longer necessary:

```sh
git clone git@github.com:iptizer/gitea-chart.git
```

```sh
# from chart repo
helm upgrade --install gitea k8s-land/gitea -n development -f development/gitea.secret.yml
# from local folder
helm upgrade --install gitea ./gitea-chart -n development -f development/gitea.secret.yml

# phpmyadmin
helm upgrade --install gitea-phpmyadmin bitnami/phpmyadmin -n development -f development/gitea-phpmyadmin.yml
```

### backup & restore

See the backup cronjob in the `/backup/` folder.

For backup & restore see [gitea documentation](https://docs.gitea.io/en-us/backup-and-restore/).

Download the `gitea-dump` locally and proceed with the following commands:

```sh
❯ mkdir gitea_restore
❯ mv gitea-dump-1587901016.zip gitea_restore
❯ cd gitea_restore
❯ unzip gitea-dump-1587901016.zip
Archive:  gitea-dump-1587901016.zip
  inflating: gitea-repo.zip          
   creating: custom/
[...]
```

Import of sql may be done via phpmyadmin.

Copy to remote pod:

```sh
kubectl cp ./gitea-repo.zip gitea-gitea-69cd9bc59b-q2b2f:/data/git/
```

And finally unzip inside shell on pod:

```sh
cd /data/git/
unzip gitea-repo.zip
mv repositories/ gitea-repositories/
chown -R git. ./gitea-repositories/
```

Then login to git.moritzgraf.de and proceed with default values, or adjust them.

## nextcloud

```sh
helm upgrade --install nextcloud stable/nextcloud -n nextcloud -f nextcloud/nextcloud.secret.yml
helm upgrade --install nextcloud-phpmyadmin bitnami/phpmyadmin -n nextcloud -f nextcloud/nextcloud-phpmyadmin.yml
```

### backup & restore

#TODO

## Jupyter

Using the project [zero-to-jupyterhub](https://zero-to-jupyterhub.readthedocs.io/en/latest/setup-jupyterhub/setup-jupyterhub.html). Helm chart can be found [here](https://github.com/jupyterhub/zero-to-jupyterhub-k8s/tree/master/jupyterhub).

```sh
helm repo add jupyterhub https://jupyterhub.github.io/helm-chart/
helm upgrade --cleanup-on-fail --install jupyter jupyterhub/jupyterhub --namespace datalab --values datalab/jupyter-values.yaml

```

## mailu

Using the [mailu helm chart](https://github.com/Mailu/helm-charts/tree/master/mailu).

```sh
helm repo add mailu https://mailu.github.io/helm-charts/
helm repo update
helm upgrade --install mailu mailu/mailu -n mailu -f mailu/mailu.secret.yml
helm upgrade --install mailu ../../mailu-helm-charts/mailu/ -n mailu -f mailu/mailu.secret.yml
helm template mailu ../../mailu-helm-charts/mailu/ -n mailu -f mailu/mailu.secret.yml
```

### troubleshooting

Test imap from console:

```sh
openssl s_client -crlf -connect moritzgraf.de:993
```

### migrate

```sh
# backup on moritzgraf.de
ssh moritzgraf.de "sudo su - docker -c 'cd /home/docker/mailu && docker-compose stop' && sudo su - root -c 'cd /home/docker && tar czvf mailu.tar.gz ./mailu && mv mailu.tar.gz /home/moritz/ && chown moritz. /home/moritz/mailu.tar.gz' && scp mailu.tar.gz haumdaucher.de:/home/moritz/"
# terraform change
cd ../terraform && terraform apply
# helm apply
cd ../k8s
helm upgrade --install mailu mailu/mailu -n mailu -f mailu/mailu.secret.yml
# apply mailu and scale all to 0
kc mailu
k scale --replicas=0 --all=true deploy
# apply restore pod
k apply -f mailu/restore.yaml
# copy tar gz
ssh one
k cp mailu.tar.gz restore:/data/
# exec to pod and arrange persistence
k exec -it restore -- bash
cd /data
tar xzvf mailu.tar.gz
mv mailu/data/* ./admin/
mv mailu/dkim/* ./dkim/
mv mailu/mail/* ./dovecotmail/
chown -R mail:man ./dovecotmail
# scale up
k scale --replicas=1 --all=true deploy
```

Checks:
* browser mail.moritzgraf.de & login
* browser mail.moritzgraf.de/admin

## Add mopbot & corona & corona-api

```sh
kubectl apply -f datalab/
```

## zebrium

[zebrium.io](https://zebrium.io) hat "AI powered" troubleshooting. This is a test use-case for my cluster. It was installed using the following command:

```sh
kubectl create namespace zebrium
helm install zlog-collector zlog-collector --namespace zebrium --repo https://raw.githubusercontent.com/zebrium/ze-kubernetes-collector/master/charts --set zebrium.collectorUrl=https://zapi03.zebrium.com,zebrium.authToken=4CFDFC1B806869D78185776AD7D940B0B16254AC,zebrium.deployment=iptizer-zebrium-deploy,zebrium.timezone=Europe/Berlin
helm install zstats-collector zstats --namespace zebrium --repo https://raw.githubusercontent.com/zebrium/ze-stats/master/charts --set zebrium.collectorUrl=https://zapi03.zebrium.com/stats/api/v1/zstats,zebrium.authToken=4CFDFC1B806869D78185776AD7D940B0B16254AC,zebrium.deployment=iptizer-zebrium-deploy
```

## Benchmark with dbench

Should be usually uncommented, but dbbench may be executed to check speed of local filesystem:

```sh
k create ns dbench
k apply -f dbench/
k delete -f dbench
```

## Web

```sh
kubectl apply -f web/
```