Add contributing in hobbyfarm (#4)

Author: devpro

docs/organizations/companies/suse/archive/hobbyfarm.md

@@ -1,4 +1,4 @@
-# HobbyFarm
+# HobbyFarm
 
 > Hobbyfarm is an interactive coding platform that runs in the browser
 
@@ -11,10 +11,10 @@
 
 ### Technologies
 
-* Front-end: Angular
-* Back-end: Go
-* Documentation: Markdown
-* Website: Hugo
+- Front-end: Angular
+- Back-end: Go
+- Documentation: Markdown
+- Website: Hugo
 
 ### Code repositories
 
@@ -30,16 +30,194 @@ Name                                                                    | Conten
 
 ### Local setup
 
-* Start [Gargantua](https://github.com/hobbyfarm/gargantua/blob/master/CONTRIBUTING.md)
-* Start Admin UI
-* TODO
+- Start [Gargantua](https://github.com/hobbyfarm/gargantua/blob/master/CONTRIBUTING.md)
+- Start Admin UI
+- TODO
 
 ## Operations
 
 ### Installation
 
-* [Documentation](https://hobbyfarm.github.io/docs/setup/installation/)
+- [Documentation](https://hobbyfarm.github.io/docs/setup/installation/)
 
 ## References
 
-* [Amazon EC2](https://aws.amazon.com/ec2/)
+- [Amazon EC2](https://aws.amazon.com/ec2/)
+
+## Contributing
+
+### Code logic
+
+The application processing starts with `main.go` file at the root of the source files. All the other go code is located in `pkg` folder.
+
+How it works:
+
+- _Clients_ are TODO
+- _Controllers_ are TODO
+- _Servers_ define the REST API entry points (route,method -> action)
+  - `AuthServer`
+  - `CourseServer`
+  - `EnvironmentServer`
+  - `ProgressServer`
+  - `RbacServer`
+  - `ScenarioServer`
+  - `ScheduleEventServer`
+  - `SessionServer`
+  - `UserServer`
+  - `VmServer`
+  - `VmSetServer`
+  - `VmTemplateServer`
+
+### Local Development
+
+- Go 1.19 must be installed
+
+```bash
+go version
+```
+
+- Build the application
+
+```bash
+go build
+```
+
+- Start local Kubernetes cluster
+
+```bash
+k3d cluster create hobbyfarm --api-port 6550 -p "8081:80@loadbalancer" -p "8082:443@loadbalancer" --agents 1
+```
+
+- Create manifest files:
+
+```yaml
+---
+# rolebindings.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: hobbyfarm-admin-rolebinding
+subjects:
+  - kind: User
+    name: admin
+    apiGroup: rbac.authorization.k8s.io
+roleRef:
+  kind: Role
+  name: hobbyfarm-admin
+  apiGroup: rbac.authorization.k8s.io
+---
+# roles.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: hobbyfarm-admin
+rules:
+  - apiGroups: ["hobbyfarm.io"]
+    resources: ["*"]
+    verbs: ["*"]
+  - apiGroups: ["rbac.authorization.k8s.io"]
+    resources: ["roles", "rolebindings"]
+    verbs: ["*"]
+---
+# users.yaml
+apiVersion: hobbyfarm.io/v1
+kind: User
+metadata:
+  name: admin
+spec:
+  id: admin
+  email: admin
+  password: $2a$10$33fQs0G.lHQdDAsdoECgA.8iYvNtyJ2XC2AmvR5x6ZkzxSuKXyfFm
+  access_codes:
+    - training
+  settings:
+    ctr_enabled: "true"
+    ctxAccessCode: example-access-code
+    terminal_fontSize: "16"
+    terminal_theme: Solarized_Dark_Higher_Contrast
+```
+
+- Define Kubernetes objects needed by HobbyFarm
+
+```bash
+kubectl create ns hobbyfarm
+kubectl apply -f samples/kubernetes/roles.yaml -n hobbyfarm
+kubectl apply -f samples/kubernetes/users.yaml -n hobbyfarm
+kubectl apply -f samples/kubernetes/rolebindings.yaml -n hobbyfarm
+```
+
+- Create CA and TLS files (see [How To Create CA and Generate SSL/TLS Certificates & Keys](https://scriptcrunch.com/create-ca-tls-ssl-certificates-keys/))
+
+```bash
+cd .ssl/
+openssl genrsa -out ca.key 2048
+openssl req -x509 -new -nodes \
+      -key ca.key -subj "/CN=hobbyfarm/C=US/L=CALIFORNIA" \
+      -days 1825 -out ca.crt
+openssl genrsa -out server.key 2048
+cat > csr.conf <<EOF
+[ req ]
+default_bits = 2048
+prompt = no
+default_md = sha256
+req_extensions = req_ext
+distinguished_name = dn
+
+[ dn ]
+C = US
+ST = California
+L = San Fransisco
+O = HobbyFarm
+OU = HobbyFarm Dev
+CN = hobbyfarm.github.io
+
+[ req_ext ]
+subjectAltName = @alt_names
+
+[ alt_names ]
+DNS.1 = hobbyfarm
+DNS.2 = hobbyfarm.dev.local
+EOF
+openssl req -new -key server.key -out server.csr -config csr.conf
+openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key \
+  -CAcreateserial -out server.crt -days 10000 \
+  -extfile csr.conf
+cd ..
+```
+
+- Run the application
+
+```bash
+go run . --kubeconfig=%userprofile%\.kube\config --webhook-tls-cert=.ssl/server.crt --webhook-tls-key=.ssl/server.key -webhook-tls-ca=.ssl/ca.crt -logtostderr -v=9 -nowebwookcall=true
+```
+
+### Local Development via docker-compose
+
+First, start the docker-compose stack in [hobbyfarm/hobbyfarm](https://github.com/hobbyfarm/hobbyfarm) to provide a local [kind](https://github.com/kubernetes-sigs/kind) cluster for CRDs.
+
+Next, run:
+
+```bash
+# create or start stack
+./compose.sh up
+
+# -- or --
+# start the stack, building changes to local dev container
+# only needed if a file in ./cicd/docker-local has changed
+./compose.sh up --build
+
+# stop stack
+./compose.sh stop
+
+# destroy stack
+./compose.sh destroy
+```
+
+The script `./compose-up.sh` does the following:
+
+- connects to the external docker network `hobbyfarm-dev`
+- mounts the external volume for kube service account credentials called `hobbyfarm-kube-sa`
+- calls `docker-compose up`
+  - creates or starts the `hf-garg` container, which runs a watch loop on golang files, re-builds on change, and listens on [localhost:16210](http://localhost:16210)
+
+To modify docker-compose variables for your local environment, copy `.env.example` to `.env` and update variables as needed.