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kube shields flask frontend.

Project description

# Kube-shields

Redirection service to for inside a Kubernetes cluster. Uses the Kubernetes API with the service account token and ca.crt injected to /var/run/secrets/ in the running container.

# Configuration


Kube-shields can be run with public access or without. This is dictated by whether or not the OTHER_SHIELDS environment variable is set. You can enable public access to the all endpoints by setting this value to a DNS name or IP address of another kube-shield in another cluster. If you only have one cluster and you want it to have public access, set the value to “None”. If a kube-shields server does not have the OTHER_SHIELDS env var set, it will only communicate to other kube-shields servers sharing the same secret key.


The SHIELD_SITE_NAME is only used for the / route, and thus only required if the OTHER_SHIELDS variable is also set. It will be displayed in the main html as the page title, and used for the shields’ hovertext.


This must be set on all kube-shield servers. The default is to use part of the python package itself, which is in no way secure. You should generate a file to be used as your shared secret and update the INTRA_SECRET env var to it’s filepath. If your intra-shield traffic is captured unencrypted it is possible given enough time to brute force your secret key. This can be mitigated by using a lengthy key and/or rotating them regularly.

# Automatic Discovery

Any Kubernetes Pod running in the same cluster as the kube-shield service and also created automatically via some other object such as a ReplicationController or DaemonSet will be found and have a health check generated for it. The check is relatively simple, only returning the number of ready containers vs total, with any discrepancy resulting in a red result instead of green. It also checks each pod to see if it has restarted more than once every other day. If so, the result will be yellow.

# Custom Checks

Making a custom check should be simple. You can create a python file with the name of the pod you would like to apply the check to. In that file, create all the helper functions you need, but be sure to prefix them with a _. The functions that don’t begin with an underscore will be used as custom checks for that pod. The return format can either be a raw value, or you can return a dict with the keys label, status, and color.

Caveat: do not name a custom check named health, it will be inaccessible.


## /

/ is available only if OTHER_SHIELDS is set. / will return HTML with a list of all the service and their checks in all the clusters. There is no caching anywhere in kube-shields though, keep that in mind.

## /_/<pod>/<check>/

The _ endpoint is for retrieving a specific pod and check’s result shield. The automatically generated check is available under the check name health. Your custom checks are available under their function names.

## /a/<name>/<check>/

The a endpoint is used to aggregate similarly named pods, as long as they have the check, into the same shield result. The name section is the leading part of pod name. For instance, the endpoint /a/foo/health/ can be used to combine the output for the pods foo-bar, foo-baz, and foo into a single shield.

## /services/

Typically only used with intra-shield traffic, returns a JSON list of all discovered services. Requires intra-shield authentication if OTHER_SHIELDS is not set.

## /services/<name>/

Also typically only used in intra-shield communication, this returns a JSON list of all checks available for the named service, or 404.

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