Services¶
Every App needs to be exposed to something, either an UI, API or other containers.However with Kubernetes we don't directly connect to the containers running the App, because those might be on another node or there might be multiple "high available" containers for the App. Instead we use what is called Services. Services are simply put "Internal Load-Balancers", they also guaranteed to be reachable by (internal!) DNS name and (in some cases) prevent traffic from reaching your App when the healthcheck isn't finished yet (or is failing).
Two kinds of services¶
Main Service¶
Every App is required to have a main service, the primary thing that users (or other Apps!) connect with. No mater if it's a webUI, an API, a database connection or something totally else, A service is always required.
Please keep in mind that every App is different, some just have one service (which ALWAYS has to be called main) and others need more (which each has to have an unique name). Every App also uses different ports, so please alter accordingly.
- variable: service
group: "Networking"
label: "Configure Service(s)"
schema:
type: dict
attrs:
- variable: main
label: "Main Service"
description: "The Primary service on which the healthcheck runs, often the webUI"
schema:
type: dict
attrs:
- variable: enabled
label: "Enable the service"
schema:
type: boolean
default: true
hidden: true
- variable: type
label: "Service Type"
description: "ClusterIP's are only internally available, nodePorts expose the container to the host node System, Loadbalancer exposes the service using the system loadbalancer"
schema:
type: string
default: "NodePort"
enum:
- value: "NodePort"
description: "NodePort"
- value: "ClusterIP"
description: "ClusterIP"
- value: "LoadBalancer"
description: "LoadBalancer"
- variable: loadBalancerIP
label: "LoadBalancer IP"
description: "LoadBalancerIP"
schema:
show_if: [["type", "=", "LoadBalancer"]]
type: string
default: ""
required: true
- variable: exetrnalIPs
label: "External IP's"
description: "External IP's"
schema:
show_if: [["type", "=", "LoadBalancer"]]
type: list
default: []
items:
- variable: externalIP
label: "External IP"
required: true
schema:
type: string
- variable: ports
label: "Service's Port(s) Configuration"
schema:
type: dict
attrs:
- variable: main
label: "Main Service Port Configuration"
schema:
type: dict
attrs:
- variable: enabled
label: "Enable the port"
schema:
type: boolean
default: true
hidden: true
- variable: protocol
label: "Port Type"
schema:
type: string
default: "HTTP"
hidden: false
enum:
- value: HTTP
description: "HTTP"
- value: "HTTPS"
description: "HTTPS"
- value: TCP
description: "TCP"
- value: "UDP"
description: "UDP"
- variable: port
label: "Container Port"
schema:
type: int
default: 5076
editable: false
hidden: true
- variable: targetport
label: "Target Port"
description: "This port exposes the container port on the service"
schema:
type: int
default: 5076
editable: true
hidden: false
required: true
- variable: nodePort
label: "Node Port (Optional)"
description: "This port gets exposed to the node. Only considered when service type is NodePort"
schema:
type: int
min: 9000
max: 65535
default: 36041
required: true