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Installation
The Random provider is available as a package in all Pulumi languages:
- JavaScript/TypeScript:
@pulumi/random - Python:
pulumi-random - Go:
github.com/pulumi/pulumi-random/sdk/v4/go/random - .NET:
Pulumi.Random - Java:
com.pulumi/random
Overview
The “random” provider allows the use of randomness within Pulumi configurations. This is a logical provider, which means that it works entirely within Pulumi’s logic, and doesn’t interact with any other services.
Unconstrained randomness within a Pulumi configuration would not be very useful, since Pulumi’s goal is to converge on a fixed configuration by applying a diff. Because of this, the “random” provider provides an idea of managed randomness: it provides resources that generate random values during their creation and then hold those values steady until the inputs are changed.
Even with these resources, it is advisable to keep the use of randomness within Pulumi configuration to a minimum, and retain it for special cases only; Pulumi works best when the configuration is well-defined, since its behavior can then be more readily predicted.
Unless otherwise stated within the documentation of a specific resource, this provider’s results are not sufficiently random for cryptographic use.
For more information on the specific resources available, see the links in the navigation bar. Read on for information on the general patterns that apply to this provider’s resources.
Resource “Keepers”
As noted above, the random resources generate randomness only when they are created; the results produced are stored in the Pulumi state and re-used until the inputs change, prompting the resource to be recreated.
The resources all provide a map argument called keepers that can be populated
with arbitrary key/value pairs that should be selected such that they remain
the same until new random values are desired.
For example:
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";
import * as random from "@pulumi/random";
const server = new random.RandomId("server", {
keepers: {
ami_id: amiId,
},
byteLength: 8,
});
const serverInstance = new aws.ec2.Instance("server", {
tags: {
Name: pulumi.interpolate`web-server ${server.hex}`,
},
ami: server.keepers.apply(keepers => keepers?.amiId),
});
import pulumi
import pulumi_aws as aws
import pulumi_random as random
server = random.RandomId("server",
keepers={
"ami_id": ami_id,
},
byte_length=8)
server_instance = aws.ec2.Instance("server",
tags={
"Name": server.hex.apply(lambda hex: f"web-server {hex}"),
},
ami=server.keepers["amiId"])
using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Aws = Pulumi.Aws;
using Random = Pulumi.Random;
return await Deployment.RunAsync(() =>
{
var server = new Random.RandomId("server", new()
{
Keepers =
{
{ "ami_id", amiId },
},
ByteLength = 8,
});
var serverInstance = new Aws.Ec2.Instance("server", new()
{
Tags =
{
{ "Name", server.Hex.Apply(hex => $"web-server {hex}") },
},
Ami = server.Keepers.Apply(keepers => keepers?.AmiId),
});
});
package main
import (
"fmt"
"github.com/pulumi/pulumi-aws/sdk/v6/go/aws/ec2"
"github.com/pulumi/pulumi-random/sdk/v4/go/random"
"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)
func main() {
pulumi.Run(func(ctx *pulumi.Context) error {
server, err := random.NewRandomId(ctx, "server", &random.RandomIdArgs{
Keepers: pulumi.StringMap{
"ami_id": pulumi.Any(amiId),
},
ByteLength: pulumi.Int(8),
})
if err != nil {
return err
}
_, err = ec2.NewInstance(ctx, "server", &ec2.InstanceArgs{
Tags: pulumi.StringMap{
"Name": server.Hex.ApplyT(func(hex string) (string, error) {
return fmt.Sprintf("web-server %v", hex), nil
}).(pulumi.StringOutput),
},
Ami: pulumi.String(server.Keepers.ApplyT(func(keepers map[string]string) (*string, error) {
return &keepers.AmiId, nil
}).(pulumi.StringPtrOutput)),
})
if err != nil {
return err
}
return nil
})
}
resources:
server:
type: random:RandomId
properties:
keepers:
ami_id: ${amiId}
byteLength: 8
serverInstance:
type: aws:ec2:Instance
name: server
properties:
tags:
Name: web-server ${server.hex}
ami: ${server.keepers.amiId}
package generated_program;
import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.random.RandomId;
import com.pulumi.random.RandomIdArgs;
import com.pulumi.aws.ec2.Instance;
import com.pulumi.aws.ec2.InstanceArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
public class App {
public static void main(String[] args) {
Pulumi.run(App::stack);
}
public static void stack(Context ctx) {
var server = new RandomId("server", RandomIdArgs.builder()
.keepers(Map.of("ami_id", amiId))
.byteLength(8)
.build());
var serverInstance = new Instance("serverInstance", InstanceArgs.builder()
.tags(Map.of("Name", server.hex().applyValue(hex -> String.format("web-server %s", hex))))
.ami(server.keepers().applyValue(keepers -> keepers.amiId()))
.build());
}
}
Resource “keepers” are optional. The other arguments to each resource must also remain constant in order to retain a random result.
keepers are not treated as sensitive attributes; a value used for keepers will be displayed in Pulumi UI output as plaintext.