Kubernetes webhook certificate generator and patcher
Overview
Generates a CA and leaf certificate with a long (100y) expiration, then patches Kubernetes Admission Webhooks
by setting the caBundle field with the generated CA.
Can optionally patch the hooks failurePolicy setting - useful in cases where a single Helm chart needs to provision resources
and hooks at the same time as patching.
The utility works in two parts, optimized to work better with the Helm provisioning process that leverages pre-install and post-install hooks to execute this as a Kubernetes job.
Security Considerations
This tool may not be adequate in all security environments. If a more complete solution is required, you may want to seek alternatives such as jetstack/cert-manager
Command line options
Use this to create a ca and signed certificates and patch admission webhooks to allow for quick
installation and configuration of validating and admission webhooks.
Usage:
kube-webhook-certgen [flags]
kube-webhook-certgen [command]
Available Commands:
create Generate a ca and server cert+key and store the results in a secret 'secret-name' in 'namespace'
help Help about any command
patch Patch a validatingwebhookconfiguration and mutatingwebhookconfiguration 'webhook-name' by using the ca from 'secret-name' in 'namespace'
version Prints the CLI version information
Flags:
-h, --help help for kube-webhook-certgen
--kubeconfig string Path to kubeconfig file: e.g. ~/.kube/kind-config-kind
--log-format string Log format: text|json (default "text")
--log-level string Log level: panic|fatal|error|warn|info|debug|trace (default "info")
Create
Generate a ca and server cert+key and store the results in a secret 'secret-name' in 'namespace'
Usage:
kube-webhook-certgen create [flags]
Flags:
--cert-name string Name of cert file in the secret (default "cert")
-h, --help help for create
--host string Comma-separated hostnames and IPs to generate a certificate for
--key-name string Name of key file in the secret (default "key")
--namespace string Namespace of the secret where certificate information will be written
--secret-name string Name of the secret where certificate information will be written
Global Flags:
--kubeconfig string Path to kubeconfig file: e.g. ~/.kube/kind-config-kind
--log-format string Log format: text|json (default "json")
--log-level string Log level: panic|fatal|error|warn|info|debug|trace (default "info")
Patch
Patch a validatingwebhookconfiguration and mutatingwebhookconfiguration 'webhook-name' by using the ca from 'secret-name' in 'namespace'
Usage:
kube-webhook-certgen patch [flags]
Flags:
-h, --help help for patch
--namespace string Namespace of the secret where certificate information will be read from
--patch-failure-policy string If set, patch the webhooks with this failure policy. Valid options are Ignore or Fail
--patch-mutating If true, patch mutatingwebhookconfiguration (default true)
--patch-validating If true, patch validatingwebhookconfiguration (default true)
--secret-name string Name of the secret where certificate information will be read from
--webhook-name string Name of validatingwebhookconfiguration and mutatingwebhookconfiguration that will be updated
Global Flags:
--kubeconfig string Path to kubeconfig file: e.g. ~/.kube/kind-config-kind
--log-format string Log format: text|json (default "text")
--log-level string Log level: panic|fatal|error|warn|info|debug|trace (default "info")
Known Users
- stable/prometheus-operator helm chart