A CLI tool to perform a pre-change validation on Nexus Dashboard Insights. It can either work with provided JSON file(s) or a terraform plan output from a Nexus as Code project. It waits for the analysis to complete and evaluates the results.
$ nexus-pcv -h
Usage: nexus-pcv [OPTIONS]
A CLI tool to perform a pre-change validation on Nexus Dashboard Insights.
Options:
--version Show the version and exit.
-v, --verbosity LVL Either CRITICAL, ERROR, WARNING, INFO or DEBUG.
-i, --hostname-ip TEXT ND hostname or IP (required, env:
PCV_HOSTNAME_IP).
-u, --username TEXT ND username (required, env: PCV_USERNAME).
-p, --password TEXT ND password (required, env: PCV_PASSWORD).
-d, --domain TEXT ND login domain (optional, default: 'local', env:
PCV_DOMAIN).
-g, --group TEXT NDI insights group name (optional, default:
'default', env: PCV_GROUP).
-s, --site TEXT NDI site or fabric name (required, env:
PCV_SITE).
-n, --name TEXT NDI pre-change validation name (optional, env:
PCV_NAME).
--suppress-events TEXT NDI comma-separated list of events to suppress
(optional, default: 'APP_EPG_NOT_DEPLOYED,APP_EPG
_HAS_NO_CONTRACT_IN_ENFORCED_VRF', env:
PCV_SUPPRESS_EVENTS).
--timeout INTEGER NDI pre-change validation timeout in minutes
(optional, default: 15, env: PCV_TIMEOUT).
-f, --file FILE NDI proposed change JSON file (optional, env:
PCV_FILE).
-t, --nac-tf-plan FILE NDI proposed change Terraform plan output
(optional, env: PCV_NAC_TF_PLAN).
-o, --output-summary FILE NDI summary of new events/anomalies written to a
file (optional, env: PCV_OUTPUT_SUMMARY).
-r, --output-url FILE NDI link (URL) to pre-change validation results
written to a file (optional, env:
PCV_OUTPUT_URL).
-h, --help Show this message and exit.
Python 3.7+ is required to install nexus-pcv. Don't have Python 3.7 or later? See Python 3 Installation & Setup Guide.
nexus-pcv can be installed in a virtual environment using pip:
pip install nexus-pcv
The tool can easily be integrated with CI/CD workflows. Arguments can either be provided via command line or environment variables. The tool will exit with a non-zero exit code in case of an error or non-suppressed events being discovered during the pre-change analysis. The --output-summary and --output-url arguments can be used to write a summary and/or a link (URL) to a file, which can then be embedded into notifications (e.g., Webex).
Nexus as Code allows users to instantiate network fabrics in minutes using an easy to use, opinionated data model. More information about Nexus as Code can be found here. A planned change can be validated before applying it to a production environment by running a terraform plan operation first and then providing the output to nexus-pcv to trigger a pre-change validation.
export PCV_HOSTNAME_IP=10.1.1.1
export PCV_USERNAME=admin
export PCV_PASSWORD=Cisco123
export PCV_GROUP=LAB
export PCV_SITE=LAB1
terraform plan -out=plan.tfplan
terraform show -json plan.tfplan > plan.json
nexus-pcv --name "PCV1" --nac-tf-plan plan.json
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