# Scan Running Images

To automatically trigger scans of running images, install a node-based image analyzer alongside the agent. Alternatively, you can scan individual images manually from the UI.

## Auto-Scan with the Image Analyzer

### What is the Image Analyzer?

The (node) image analyzer (NIA) provides the capability to scan images as soon as they start running on hosts where the analyzer is installed. It is typically installed alongside the Sysdig agent container.

On container start-up, the analyzer scans all pre-existing running images present in the node. Additionally, it will scan any new image that enters a running state in the node. It will scan each image once, then forward the results to the Sysdig Secure scanning backend. Image metadata and the full scan report is then available in the Sysdig Secure UI.

The analyzer performs the image analysis directly on the local host. This poses several benefits:

• Automation: Every image executed on your environments will be automatically scanned and checked against the vulnerability databases and configured scanning policies, without requiring any manual intervention

• Privacy: Using local analysis, only image metadata is sent to the Sysdig backend, as opposed to pulling the entire image to be evaluated with backend scanning, which provides improved privacy

• Improved registry security: Since the Sysdig backend will not pull the image from a registry, there is no need to configure registry credentials on the Sysdig-side, nor open up the registry endpoints to be accessed over public networks

If the node image analyzer is installed, there is no longer any need to manually trigger running image scans.

### Note

If you have run the single line agent install with the --image-analyzer flag, then this component is already running in your infrastructure.

The feature is available for Kubernetes environments in Sysdig Secure SaaS and in On-Premises version 3.5.1+.

Otherwise, the Image Analyzer is now deployed as a part of the Node Analyzer: Multi-Feature Installation.

## Manually Scan an Image

If the node image analyzer is not installed, then when a new image is added to a running environment it may need to be scanned manually. This can be done from either the Runtime tab, or the Scan Results tab.

### From the Runtime Tab

To manually scan an image from the Runtime tab:

1. From the Scanning module, choose the Runtime tab.

2. Sort by Unscanned and select an image from the list of unscanned images.

3. Click Scan Now if the option is displayed. You may be prompted to install the Image Analyzer if the digest could not be detected.

### From the Image Results Tab

1. From the Scanning module, choose the Image Results tab.

2. Click Scan Image

3. Define the path to the image, and click Scan.