# FAQ

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<summary>Where can I find a list of environment variables that Instruqt injects?</summary>

You can find the available environment variables at `/etc/profile.d/instruqt-env.sh`

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<summary>Why are my process being killed randomly?</summary>

This is usually caused by your container or virtual machine running out of memory. Try increasing the memory and running your process again.

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<summary>Why isn't my service tab connecting to an HTTPS server?</summary>

To use services running on HTTPS (including self-signed certificates), use a port that *ends with* `443`. For example, you could use port 8443.

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<summary>Why is my track log showing SSH connection errors?</summary>

While the sandbox hosts are starting up, the Instruqt platform tries to make an SSH connection. You will see this in the logs:

`Retrying SSH connection until it is available: ssh: handshake failed`

This is expected behavior and it should not last more than 10-20 seconds until a connection is made.

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<summary>Why isn't my Custom Compute Engine machine image working?</summary>

The [track logs](https://docs.instruqt.com/tracks/manage/viewing-logs) show the cause, but most likely this is a permissions error as our service account [needs access](https://docs.instruqt.com/sandboxes/hosts/create-a-custom-vm-image#step-4-grant-permissions-to-instruqt) to use your machine image.&#x20;

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<summary>Why isn't my container starting?</summary>

Container images built using *podman* or *buildah* might not work properly. Sometimes tracks using those images won't start, and `instruqt track logs` shows a message like this one:&#x20;

`2020-12-04T12:50:31Z bii3rgpaqgcr INFO: module.hostname.kubernetes_deployment.deployment: Still creating... [1m0s elapsed]`

To resolve this issue, use the option `--format=docker` to push to the registry. The underlying problem is that the mediaType in the container image is not set properly, causing the Kubernetes pod to fail with the following error:&#x20;

`Error response from deamon: mediaType in manifest should be 'application/vnd.docker.distribution.manifest.v2+json' not ''`

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Do you still have questions? [Join our Slack ](https://join.slack.com/t/instruqt/shared_invite/zt-snkgsuwz-uhNDkG1ItdvGgMXj6ML8jg)and let us know how we can help you!
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