Frequently Asked Questions
Q: How do I get help with Tilt?
You can also file an issue in our GitHub repo.
For help with private issues (like security vulnerabilities or just concerning non-public code), please email firstname.lastname@example.org.
Common Error Messages
Q: When I run
tilt version, I see “template engine not found for: version”. What do I do?
There is another project called Tilt for developing Ruby templates.
You’re accidentally running that Tilt instead.
Common fixes include deleting the other Tilt, always using an absolute path, or
renaming Tilt to
tlt to avoid the conflict. Tilt is a static binary so it is OK to
Q: I immediately get error messages like “WARNING: Image not used in any deploy config”. What does this mean?
To start your app, Tilt needs both:
1) Instructions on how to build an image (like a
2) Instructions on how to run your image (like a
This error message means that your Tiltfile has instructions for building an image, but no instructions for how to run it. It’s like an “unused variable” warning.
Did you forget the Kubernetes YAML? Or did you just misspell the image name?
Q: I’m getting push errors like “unauthorized: You don’t have the needed permissions”. What do I do?
If Tilt is trying to do a push, that means it thinks you wanted to deploy to a remote cluster. See below on how to configure for a local cluster.
Q: Tilt fails with “Unable to connect to cluster” errors. What do I do?
The Kubernetes server that you’re trying to deploy to is misbehaving.
Two common things to try are:
Turn it off and turn it back on again (really!).
Reset the cluster state.
But the specific way to do these depend on your environment.
If you’re using Docker For Mac, click the Docker icon in the upper-right hand corner of your screen. Choose “Preferences…” to open a dialog. The “Kubernetes” tab has a button that allows you to enable/disable Kubernetes. The “Reset” tab has a button that allows you to reset the cluster state.
If you’re using Minikube,
minikube stop and
minikube start will restart the
minikube delete will reset the cluster state.
How do I…?
Q: How do I configure my app dynamically?
The Tiltfile API has several built-in functions for reading configuration:
- Read an environment variable with
- Read a file with
- Read a JSON or YAML file with
local()to run local shell commands.
You can even define your own flags to
tilt up with the config api.
Q: Tilt says it’s building images. But I can’t find them with the Docker CLI. What’s going on?
If you are using Minikube or MicroK8s, Tilt will automatically connect to the Docker server inside the cluster. This helps performance because Tilt doesn’t need to waste time copying Docker images around.
To check which Docker server Tilt is connecting to, run:
Tilt will print the Docker host. You can then run commands against that Docker host:
DOCKER_HOST=tcp://my-url/ docker images
Q: All the Tilt examples store the image at
gcr.io. Isn’t it really slow to push images up to Google’s remote repository for local development?
You’re right, that would be slow!
Most local Kubernetes development solutions let you build images directly inside the cluster. There’s no need to push the image to a remote repository.
When you’re using Docker for Mac, Minikube, or MicroK8s, Tilt will automatically build the images in-cluster. When it detects this case, it will even modify your Kubernetes configs to set ImageNeverPull, so that Kubernetes will emit an error if it even tries to pull an image from a remote server.
Q: Docker BuildKit is cool! How do I use it?
BuildKit is a new build engine in Docker for building container images.
Tilt will automatically enable BuildKit if your local Docker installation supports it.
BuildKit is supported on Docker v18.06 when Experimental mode is enabled, and on Docker v18.09+
If you want to disable BuildKit manually, set
Q: How do I tell Tilt to build my images with a remote Docker server?
Tilt reads the same environment variables as the
docker command for choosing a
DOCKER_HOST: Set the url to the docker server.
DOCKER_API_VERSION: Set the version of the API.
DOCKER_CERT_PATH: Set the path to load the TLS certificates from.
DOCKER_TLS_VERIFY: To enable or disable TLS verification when using
DOCKER_CERT_PATH, off by default.
This is helpful if you have a more powerful machine in the cloud that you want to build your images.
Q: How do I change what Kubernetes cluster Tilt uses?
Tilt uses the default Kubernetes cluster configured in
To see what cluster
kubectl uses, run:
kubectl config current-context
To see what clusters are available, run:
kubectl config get-contexts
To change the cluster you’re deploying to, run:
kubectl config use-context docker-desktop
The most common options we see in local development are
docker-desktop (Docker For Mac stable), and
docker-for-desktop (older Docker for Mac versions).
Q: What local Kubernetes solution should I choose?
Check out our Guide to Choosing a Local Cluster.