Consul ACL Templated Policy Preview

Command: consul acl templated-policy preview

Corresponding HTTP API Endpoint: [POST] /v1/acl/templated-policy/preview/:name

Use the acl templated-policy preview command to preview the policy generated from a templated policy.

You must provide an ACL token with acl:read permissions to use the consul all templated-policy preview command.

The command does not support blocking queries and agent caching.

Usage

Usage: consul acl templated-policy preview [options] [args]

Command Options

-name: String value that specifies the templated policy name. Use -var flag to specify variables when required.
var: String value that specifies templated policy variables. Must be used in combination with -name flag to specify required variables. You can use the flag multiple times with different variables. Format is VariableName:Value
-file: String value that specifies the path to a file containing templated policies and variables.
-format: Specifies the output format. You can specify either pretty or json The default value is pretty.

Enterprise options

-partition=<string> - Enterprise Specifies the admin partition to query. If not provided, the partition is inferred from the request's ACL token, or defaults to the default partition.

-namespace=<string> - Specifies the namespace to query. If not provided, the namespace will be inferred from the request's ACL token, or will default to the default namespace. Namespaces are a Consul Enterprise feature added in v1.7.0.

API options

-ca-file=<value> - Path to a CA file to use for TLS when communicating with Consul. This can also be specified via the CONSUL_CACERT environment variable.
-ca-path=<value> - Path to a directory of CA certificates to use for TLS when communicating with Consul. This can also be specified via the CONSUL_CAPATH environment variable.
-client-cert=<value> - Path to a client cert file to use for TLS when verify_incoming is enabled. This can also be specified via the CONSUL_CLIENT_CERT environment variable.
-client-key=<value> - Path to a client key file to use for TLS when verify_incoming is enabled. This can also be specified via the CONSUL_CLIENT_KEY environment variable.
-http-addr=<addr> - Address of the Consul agent with the port. This can be an IP address or DNS address, but it must include the port. This can also be specified via the CONSUL_HTTP_ADDR environment variable. In Consul 0.8 and later, the default value is http://127.0.0.1:8500, and https can optionally be used instead. The scheme can also be set to HTTPS by setting the environment variable CONSUL_HTTP_SSL=true. This may be a unix domain socket using unix:///path/to/socket if the agent is configured to listen that way.
-tls-server-name=<value> - The server name to use as the SNI host when connecting via TLS. This can also be specified via the CONSUL_TLS_SERVER_NAME environment variable.
-token=<value> - ACL token to use in the request. This can also be specified via the CONSUL_HTTP_TOKEN environment variable. If unspecified, the query will default to the token of the Consul agent at the HTTP address.
-token-file=<value> - File containing the ACL token to use in the request instead of one specified via the -token argument or CONSUL_HTTP_TOKEN environment variable. This can also be specified via the CONSUL_HTTP_TOKEN_FILE environment variable.

-datacenter=<name> - Name of the datacenter to query. If unspecified, the query will default to the datacenter of the Consul agent at the HTTP address.
-stale - Permit any Consul server (non-leader) to respond to this request. This allows for lower latency and higher throughput, but can result in stale data. This option has no effect on non-read operations. The default value is false.

Examples

The following examples demonstrate common patterns for using the acl templated-policy preview command.

Preview a templated policy with no required variables

consul acl templated-policy preview -name "builtin/dns"
ID:           0a6e6f64655f70726566697...
Name:         synthetic-policy-0a6e6f...
Description:  synthetic policy generated from templated policy: builtin/dns
Datacenters:
Rules:
node_prefix "" {
    policy = "read"
}
service_prefix "" {
    policy = "read"
}
query_prefix "" {
    policy = "read"
}

Preview a templated policy with required variables

In the following example, Consul prints a preview of the policy generated from the builtin/service templated policy for the service name api.

consul acl templated-policy preview -name "builtin/service" -var "name:api"
ID:           0a736572766963652022617...
Name:         synthetic-policy-0a7365...
Description:  synthetic policy generated from templated policy: builtin/service
Datacenters:
Rules:
service "api" {
    policy = "write"
}
service "api-sidecar-proxy" {
    policy = "write"
}
service_prefix "" {
    policy = "read"
}
node_prefix "" {
    policy = "read"
}

Preview a templated policy using a file:

The following example shows a payload request to preview of the policy generated from the builtin/service templated policy. The payload includes a variable named web, which Consul uses as the service name.

Sample payload

TemplatedPolicy "builtin/service" {
  Name = "web"
}

$ consul acl templated-policy -file templated-policy.hcl
ID:           0a736572766963652022776...
Name:         synthetic-policy-0a7365...
Description:  synthetic policy generated from templated policy: builtin/service
Datacenters:
Rules:
service "web" {
    policy = "write"
}
service "web-sidecar-proxy" {
    policy = "write"
}
service_prefix "" {
    policy = "read"
}
node_prefix "" {
    policy = "read"
}