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https://github.com/fjudith/saltstack-kubernetes

Deploy the lowest-cost production ready Kubernetes cluster using terraform and saltstack.
https://github.com/fjudith/saltstack-kubernetes

cluster cncf hyperconverged kubernetes saltstack terraform

Last synced: about 1 month ago
JSON representation

Deploy the lowest-cost production ready Kubernetes cluster using terraform and saltstack.

Host: GitHub
URL: https://github.com/fjudith/saltstack-kubernetes
Owner: fjudith
License: apache-2.0
Created: 2019-05-18T12:51:19.000Z (over 5 years ago)
Default Branch: master
Last Pushed: 2024-02-01T23:08:19.000Z (9 months ago)
Last Synced: 2024-09-30T13:34:21.711Z (about 1 month ago)
Topics: cluster, cncf, hyperconverged, kubernetes, saltstack, terraform
Language: Jinja
Homepage:
Size: 16.1 MB
Stars: 70
Watchers: 6
Forks: 21
Open Issues: 0
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE

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README

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---

Saltstack-Kubernetes is an open source Kubernetes cluster deployment platform which aims to evaluate and run Cloud Native Applications like those registered in the [CNCF landscape](https://landscape.cncf.io).
Server provisionning is managed using [Terraform](https://www.terraform.io) with a primarly target on low-cost Cloud providers like [Scaleway](https://scaleway.com) and [Hetzner](https://hetzner.com/cloud).
Kubernetes cluster deployment is managed using [Saltstack](https://saltstack.com) to deploy the various software binaries, configuration files and cloud native applications required to operate.

---

## Solution design

The solution design carries the following requirements:

1. **Cloud provider agnostic**: Works similarly on any clouds
2. **Networking privacy**: All intra-cluster communications are TLS encrypted, pod network is encrypted, Firewall is enabled by default.
2. **Cluster security**: Node security and RBAC are enabled by default
4. **Public endpoint**: Leverage two servers stanting as edge gateway and allow the use of a single redudant Public IP address
5. **Secure admin network**: Establish a private Mesh VPN between all servers
6. **Composable CRI**: Support various Container Runtime Interface plugins (see: [Features](./docs/features.md))
7. **Composable CNI**: Support various Container Network Interface plugins (see: [Features](./docs/features.md))
8. **Converged Storage**: Persistent storage provided by cluster nodes
9. **API driven DNS**: DNS records are managed just-in-time during the deployment
10. **Stable**: Only leverage stable versions of software components

---

## Major components versions

Cloud provider
DNS provider
Kubernetes version
Container runtime
Container network

hetzner

scaleway

cloudflare

1.26.4

docker 19.03.13

containerd 1.6.20

cri-o 1.27.0

cni 1.2.0

calico 3.25.1

flannel 0.1.0

weave 2.6.5

cillium 1.13.2

* Default: **bold**

---

## Quick start

### Pre-requisits

Before starting check that following requirements are met:

* [ ] Register a public domain name
* [ ] Associate the domain name with [Cloudflare (Free)](https://www.cloudflare.com)
* [ ] Register with the cloud provider of your choice. Expect 100$ for a full month (i.e [Scaleway](https://scaleway.com), [Hetzner](https://hetzner.com/cloud))
* [ ] Setup the `terraform/terraform.tfvars` with your appropriate credentials and configuration using this [Example](./terraform/terraform.tfvars.example)
* [ ] Setup the `srv/pillar/cluster_config.sls` with your appropriate credentials and configuration using this [Example](./srv/pillar/cluster_config.sls.example)
* Use this [guide](./docs/password.md) to customize the various credentials.
* [ ] Install the [required tools](./docs/prerequisits.md) (i.e. terraform, jq, wireguard-tools, etc.)
* [ ] Create the SSH key required to send commands to the servers.

> **Notice**: The configuration files are recorded in the `.gitignore` file to avoid the accidental uploads on the Web.

### Server creation

Once the requirements are met, use the following command lines instanciate the server and the appropriate dns records.

```bash
cd terrafrom/
terraform init
terraform plan
terraform apply
```

14 servers are instanciated by default. Terraform task parallelism is constrained in order to contraint the load on the cloud provider API.

At the end of the process a similar output should be displayed, listing all the generated servers and associated IP adresses.

```text
Outputs:

hostnames = [
edge01,
edge02,
etcd01,
etcd02,
etcd03,
master01,
master02,
master03,
node01,
node02,
node03,
node04,
node05,
node06
]

...

vpn_ips = [
172.17.4.251,
172.17.4.252,
172.17.4.51,
172.17.4.52,
172.17.4.53,
172.17.4.101,
172.17.4.102,
172.17.4.103,
172.17.4.201,
172.17.4.202,
172.17.4.203,
172.17.4.204,
172.17.4.205,
172.17.4.206
]
```

### Kubernetes cluster deployment

The Kubernetes cluster deployment is acheived by connecting to the **salt-master** server (i.e edge01) to execute the salt states.

This can be acheived using the following one-liner...

```bash
ssh [email protected] -C "salt-run state.orchestrate _orchestrate"
```

... Or by opening first a SSH session to get benefit of the salt state output coloring.

```bash
ssh [email protected]

root@edge01 ~ # salt-run state.orchestrate _orchestrate
```

---

## Accessing

> **Replace** example.com" with the "public-domain" value from the salt pillar.

Retrieve the admin user token stored in the salt pillar (i.e /srv/pillar/cluster_config.sls).

Install [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl).

Download the Kubernetes cluster CA certificate.

```bash
export CLUSTER_DOMAIN="example.com"

mkdir -p ~/.kube/ssl/${CLUSTER_DOMAIN}
scp root@edge01.${CLUSTER_DOMAIN}:/etc/kubernetes/ssl/ca.pem ~/.kube/ssl/${CLUSTER_DOMAIN}/
```

Create the kubectl configuration file.

```bash
export CLUSTER_TOKEN=mykubernetestoken
export CLUSTER_NAME="example"
export KUBECONFIG="~/.kube/config"

kubectl config set-cluster ${CLUSTER_NAME} \
--server=https://kubernetes.${CLUSTER_DOMAIN}:6443 \
--certificate-authority=~/.kube/ssl/${CLUSTER_DOMAIN}/ca.pem

kubectl config set-credentials admin-${CLUSTER_NAME} \
--token=${CLUSTER_TOKEN}

kubectl config set-context ${CLUSTER_NAME} \
--cluster=${CLUSTER_NAME} \
--user=admin-${CLUSTER_NAME}

kubectl config use-context ${CLUSTER_NAME}
```

### Kubernetes cluster access

Check the Kubernetes cluster component health.

```bash
kubectl get componentstatus

NAME STATUS MESSAGE ERROR
etcd-2 Healthy {"health": "true"}
etcd-1 Healthy {"health": "true"}
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health": "true"}
```

Check the Kubernetes cluster nodes status.

```bash
kubectl get nodes

NAME STATUS ROLES AGE VERSION
edge01 Ready ingress,node 32d v1.26.4
edge02 Ready ingress,node 32d v1.26.4
master01 Ready master 32d v1.26.4
master02 Ready master 32d v1.26.4
master03 Ready master 32d v1.26.4
node01 Ready node 32d v1.26.4
node02 Ready node 32d v1.26.4
node03 Ready node 32d v1.26.4
node04 Ready node 32d v1.26.4
node05 Ready node 32d v1.26.4
node06 Ready node 32d v1.26.4
```

Retreive the URLs protected by the Kube-APIserver.

```bash
kubectl cluster-info

Kubernetes control plane is running at https://kubernetes.example.com:6443
Elasticsearch is running at https://kubernetes.example.com:6443/api/v1/namespaces/kube-system/services/elasticsearch-logging:db/proxy
Kibana is running at https://kubernetes.example.com:6443/api/v1/namespaces/kube-system/services/kibana-logging/proxy
CoreDNS is running at https://kubernetes.example.com:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
```

## Kubectl Proxy

The URLs returned by `kubectl cluster-info` are protected by a mutual TLS authentification. Meaning that direct access from your Web Browser is denied until you register the appropriate certificate and private key in it.

Prefer the `kubectl proxy` command which enables the access to URL protected by the Kube-APIServer.
Once launched. URLs are available from the **localhost** on the HTTP port 8001.

> e.g. http://localhost:8001/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

![Kubernetes Dashboard](./docs/media/kubernetes_dashboard.png)

---

## Credits

This project is vastly inspired by the following projects:

* [Kubernetes-Saltstack](https://github.com/valentin2105/Kubernetes-Saltstack) from [@valentin2105](https://github.com/valentin2105)
* [hobby-kube](https://github.com/hobby-kube/provisionning) from [@pstadler](https://github.com/pstadler)
* [Kubernetes The Hard Way](https://github.com/kelseyhightower/kubernetes-the-hard-way) from [@kelseyhightower](https://github.com/kelseyhightower)
* [Saltformula-Kubernetes](https://github.com/salt-formulas/salt-formula-kubernetes)
* [Kubernetes Icons](https://github.com/octo-technology/kubernetes-icons)

## License
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