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`import * as pulumi from "@pulumi/pulumi";`
`import * as linode from "@pulumi/linode";`
`const fs = require("fs");`
`const path = require("path");`
`let pubKey: string = fs.readFileSync(path.join(__dirname,'id_rsa.pub')).toString();`
`let pubKeys: string[] = pubKey.split("");`

`const masterInstance = new linode.Instance("nanode-master", {`
    `group: "masters",`
    `type: "g6-nanode-1",`
    `region: "ap-south",` 
    `image: "linode/alpine3.13",`
    `authorizedKeys: pubKeys,`
    `rootPass: "rootPass123!",`
    `tags: ["master node"],`
    `watchdogEnabled: true`
`});`

I'm also having issue that pulumi cannot read files outside its parent folder but within own folder. When I readFileSync from "../../secret/id_rsa.pub", it keeps saying it can't read the file. But when I placed it in the same folder with the index.ts, it is able to read.

I don't think this line is correct:
```let pubKeys: string[] = pubKey.split("");```

why wouldn't you do:
```const masterInstance = new linode.Instance("nanode-master", {
    group: "masters",
    type: "g6-nanode-1",
    region: "ap-south", 
    image: "linode/alpine3.13",
    authorizedKeys: [ pubKey ],
    rootPass: "rootPass123!",
    tags: ["master node"],
    watchdogEnabled: true
});```

Still having error "error: 1 error occurred:
        * Error creating a Linode Instance: [400] [authorized_keys] SSH Key 1 must not be multi-lined."

But my id_rsa.pub is a single line though.

I would double check what the output of `let pubKey: string = fs.readFileSync(path.join(__dirname,'id_rsa.pub')).toString();` is returning

is returning the exact content of my public key in the console.log in a single line.

is `toString()` adding a newline on the end?

my bad, there is indeed a newline on the end. sorry about that.

How about reading id_rsa in another folder outside its parent folder?

there's nothing stopping Pulumi reading files outside the parent folder, there's no sandboxing etc. It just uses a standard node interpreter, so I'd double check your path maybe?

strange though. I use the exact code inside express. it works. but the exact same code in pulumi, it gives file does not exist error

I'll try do a repro when i get a few minutes

`let pubKey: string = fs.readFileSync(path.join(__dirname,'/../secret/id_rsa.pub')).toString();`

this line works in express, console.log(pubKey) prints the public key in console. the same line in pulumi gives this error "Error: ENOENT: no such file or directory, open '/secret/id_rsa.pub'"

Ok never mind. Is the file permission problem. My bad again.

It still doesn't work even i set the permission to 777