open-consul/website/content/commands/tls/ca.mdx

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---
layout: commands
page_title: 'Commands: TLS CA Create'
sidebar_title: ca
---
# Consul TLS CA Create
Command: `consul tls ca create`
This command create a self signed CA to be used for Consul TLS setup.
## Example
Create CA:
```shell-session
$ consul tls ca create
==> Saved consul-ca.pem
==> Saved consul-ca-key.pem
```
## Usage
Usage: `consul tls ca create [filename-prefix] [options]`
#### TLS CA Create Options
- `-additional-name-constraint=<value>` - Add name constraints for the CA.
Results in rejecting certificates for other DNS than specified. Can be used
multiple times. Only used in combination with `-name-constraint`.
- `-days=<int>` - Provide number of days the CA is valid for from now on, defaults to 5 years.
- `-domain=<string>` - Domain of consul cluster. Only used in combination with
`-name-constraint`. Defaults to `consul`.
- `-name-constraint` - Add name constraints for the CA. Results in rejecting
certificates for other DNS than specified. If turned on localhost and -domain
will be added to the allowed DNS. If the UI is going to be served over HTTPS
its DNS has to be added with `-additional-constraint`. It is not possible to
add that after the fact! Defaults to false.