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Update README.md (#810)
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@@ -1176,7 +1176,7 @@ $ trivy image --skip-dirs "/usr/lib/ruby/gems,/etc" fluent/fluentd:edge
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### Skip update of vulnerability DB
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`Trivy` always updates its vulnerability database when it starts operating. This is usually fast, as it is a different update. But if you want to skip even that, use the `--skip-update` option.
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`Trivy` downloads its vulnerability database every 12 hours when it starts operating. This is usually fast, as the size of the DB is only 10~30MB. But if you want to skip even that, use the `--skip-update` option.
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```
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$ trivy image --skip-update python:3.4-alpine3.9
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