https://github.com/zackbradys/rgs-demo-app
Rancher Government Solutions Demo App
https://github.com/zackbradys/rgs-demo-app
Last synced: about 1 year ago
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Rancher Government Solutions Demo App
- Host: GitHub
- URL: https://github.com/zackbradys/rgs-demo-app
- Owner: zackbradys
- License: mit
- Created: 2023-10-13T03:57:16.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-01-13T04:04:56.000Z (over 2 years ago)
- Last Synced: 2025-04-09T13:23:11.690Z (about 1 year ago)
- Language: Go
- Size: 1.12 MB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
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README
# Rancher/Kubernetes Demo Application
This is a Go demo application used for demonstrating Kubernetes and load balancing.
It will create a colored icon for each replica within a ReplicaSet and indicate which one
most recently served a response. Replicas which haven't been heard from will begin to fade
out, until after a configurable number of seconds they will disappear. This is useful for
demonstrating scaling up/down or in the case of an application like [Rio](https://rio.io),
for showing scale-in of an upgraded application.
## Environment Variables
- `TITLE`: sets title in demo app
- `SHOW_VERSION`: show version of app in ui (`VERSION` env var)
- `REFRESH_INTERVAL`: interval in milliseconds for page to refresh (default: 1000)
- `EXPIRE_INTERVAL`: how long a replica can go without being seen before we remove it from the display (default: 10s)
- `REMOVE_INTERVAL`: how long after `EXPIRE_INTERVAL` until we remove the icon (default: 20s)
- `SKIP_ERRORS`: set this to prevent errors from counting (useful on janky load balancers)
- `METADATA`: extra text at bottom of info area
- `COW_COLOR`: what color the cow background should be (default: black). Valid options are any color from the CSS pallete, including:
- red
- orange
- yellow
- olive
- green
- teal
- blue
- violet
- purple
- pink
- black
## Build
`docker build -t monachus/rancher-demo .`
## Paths
By default the loaded page will reach back to `/demo` every `REFRESH_INTERVAL` and use the returned information to update the display. Other paths are:
- `/info` - returns some additional information about the replica serving the request
- `/load` - adds a 2s delay to the response from `/info` - use this for putting artificial load on the system and watching the replicas scale
## Ports
The container will listen for traffic on port 8080.
## Running
1. Edit `base/configs/source-vars.yaml` and set the following:
- `MY_NAMESPACE`: the namespace into which the app will be deployed (default: `rancher-demo`). This will be created if it does not already exist.
- `URL_HOST`: the hostname portion of the URL that the ingress will answer on (default: `rancher-demo.home.monach.us`)
2. Run `kubectl apply -k base` to deploy the application.