Air-Gapped Environment

Trivy can be used in air-gapped environments.

Download the vulnerability database

At first, you need to download the vulnerability database for use in air-gapped environments. Go to trivy-db and download trivy-offline.db.tgz in the latest release. If you download trivy-light-offline.db.tgz, you have to run Trivy with --light option.

$ wget https://github.com/aquasecurity/trivy-db/releases/latest/download/trivy-offline.db.tgz

Transfer the DB file into the air-gapped environment

The way of transfer depends on the environment.

$ rsync -av -e ssh /path/to/trivy-offline.db.tgz [user]@[host]:dst

Put the DB file in Trivy’s cache directory

You have to know where to put the DB file. The following command shows the default cache directory.

$ ssh user@host
$ trivy -h | grep cache
   --cache-dir value  cache directory (default: "/home/myuser/.cache/trivy") [$TRIVY_CACHE_DIR]

Put the DB file in the cache directory + /db.

$ mkdir -p /home/myuser/.cache/trivy/db
$ cd /home/myuser/.cache/trivy/db
$ mv /path/to/trivy-offline.db.tgz .

Then, decompress it. trivy-offline.db.tgz file includes two files, trivy.db and metadata.json.

$ tar xvf trivy-offline.db.tgz
x trivy.db
x metadata.json
$ rm trivy-offline.db.tgz

In an air-gapped environment it is your responsibility to update the Trivy database on a regular basis, so that the scanner can detect recently-identified vulnerabilities.

Run Trivy with —skip-update option

In an air-gapped environment, specify --skip-update so that Trivy doesn’t attempt to download the latest database file.

$ trivy image --skip-update alpine:3.12