Traefik Ingress Operator for Kubernetes
- Canonical Observability
Channel | Revision | Published | Runs on |
---|---|---|---|
latest/stable | 194 | 01 Aug 2024 | |
latest/candidate | 199 | 28 Jun 2024 | |
latest/beta | 203 | 01 Aug 2024 | |
latest/edge | 213 | 18 Oct 2024 | |
1.0/stable | 164 | 16 Feb 2024 | |
1.0/candidate | 164 | 22 Nov 2023 | |
1.0/beta | 164 | 22 Nov 2023 | |
1.0/edge | 164 | 22 Nov 2023 |
juju deploy traefik-k8s
Deploy Kubernetes operators easily with Juju, the Universal Operator Lifecycle Manager. Need a Kubernetes cluster? Install MicroK8s to create a full CNCF-certified Kubernetes system in under 60 seconds.
Platform:
Whenever Traefik is used to ingress your Kubernetes workloads, you risk encountering the dreaded “Gateway Address Unavailable” message. In this article, we’ll go through what you can do to remediate it.
Checklist
- The metallb microk8s addon is enabled.
- Traefik’s service type is
LoadBalancer
. - An external IP address is assigned to traefik.
The metallb addon isn’t enabled
Check with:
microk8s status -a metallb
If it is disabled, you can enable it with:
IPADDR=$(ip -4 -j route get 2.2.2.2 | jq -r '.[] | .prefsrc')
microk8s enable metallb:$IPADDR-$IPADDR
This command will fetch the IPv4 address assigned to your host, and hand it to MetalLB as an assignable IP. If the address range you want to hand to MetalLB differs from your host ip, alter the $IPADDR
variable to instead specify the range you want to assign, for instance IPADDR=10.0.0.1-10.0.0.100
.
No external IP address is assigned to the traefik service
Does the traefik service have an external IP assigned to it? Check with:
JUJU_APP_NAME="traefik"
kubectl get svc -A -o wide | grep -E "^NAMESPACE|$JUJU_APP_NAME"
No available IP in address pool
This frequently happens when:
- Metallb has only one IP in its range but you deployed two instances of traefik, or traefik is forcefully removed (
--force --no-wait
) and then a new traefik app is deployed immediately after. - The
ingress
addon is enabled. It’s possible that nginx from the ingress addon has claimed the ExternalIP. Disable nginx and re-enable metallb.
Check with:
kubectl get ipaddresspool -n metallb-system -o yaml && kubectl get all -n metallb-system
You could add more IPs to the range:
FROM_IP="..."
TO_IP="..."
microk8s enable metallb:$FROM_IP-$TO_IP
Juju reverted the service type to ClusterIP
Juju controller cycling may cause the type to revert from LoadBalancer
back to ClusterIP
.
Check with:
kubectl get svc -A -o wide | grep -E "^NAMESPACE|LoadBalancer"
If traefik isn’t listed (it’s not LoadBalancer
), then recreate the pod to have it retrigger the assignment of the external IP with kubectl delete
. It should be LoadBalancer
when kubernetes brings it back.
Integration tests pass locally but fail on GitHub runners
This used to happen when the github runners were at peak usage, making the already small 2cpu7gb runners run even slower. As much of a bad answer as this is, the best response may be to increase timeouts or try to move CI jobs to internal runners.
Verification
Verify that the Traefik Kubernetes service now has been assigned an external IP:
$ microk8s.kubectl get services -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)
cos traefik LoadBalancer 10.152.183.130 10.70.43.245 80:32343/TCP,443:30698/TCP 4d3h
👆 - This one!
Verify that Traefik is functioning correctly by trying to trigger one of your ingressed paths. If you have COS Lite deployed, you may check that if works as expected using the Catalogue charm:
$ curl http://<TRAEFIKS_EXTERNAL_IP>/<YOUR_MODEL_NAME>-catalogue/
# for example...
$ curl http://10.70.43.245/cos-catalogue/
This command should return a long HTML code block if everything works as expected.