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22 changes: 18 additions & 4 deletions README.md
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Expand Up @@ -82,10 +82,12 @@ it. Optional instructions for generating a fresh key are provided at the end.

##### Single User Mode

Copy the rsa key to your ssh folder
Copy the insecure rsa key to /etc/nix
```sh
sudo mkdir -p /etc/nix
chown -R username /etc/nix
chmod 600 ssh/insecure_rsa
cp ssh/insecure_rsa ~/.ssh/docker_rsa
sudo cp ssh/insecure_rsa /etc/nix/docker_rsa
```

Add an entry for the container in your ~/.ssh/config
Expand All @@ -94,7 +96,7 @@ Host nix-docker
User root
HostName 127.0.0.1
Port 3022
IdentityFile ~/.ssh/docker_rsa
IdentityFile /etc/nix/docker_rsa
```

##### Multi User Mode (Nix Daemon)
Expand All @@ -120,7 +122,7 @@ Host nix-docker
ssh-keygen -t rsa -b 2048 -N "" -f docker_rsa
scp docker_rsa.pub nix-docker:/root/.ssh/authorized_keys
```
Then copy the key to either `/etc/nix` or `~/.ssh` depending on if you are running nix in single or multi user mode.
Then copy the key to `/etc/nix`.

#### Create a signing keypair
```sh
Expand All @@ -136,8 +138,20 @@ scp /etc/nix/signing-key.sec nix-docker:/etc/nix/signing-key.sec
sudo cp ssh/remote-build-env /etc/nix/
sudo cp ssh/machines /etc/nix/
```
Edit the `nix.conf` (Found in `~/.config/nix/nix.conf` for single user installation) and make sure that it contains this line:

```
builders = @/etc/nix/machines
```

### Build a linux derivation
```sh
nix-build -E 'with import <nixpkgs> { system = "x86_64-linux"; }; hello.overrideAttrs (drv: { REBUILD = builtins.currentTime; })'
```


### Troubleshooting

Problem: `ssh: Could not resolve hostname nix-docker: nodename nor servname provided, or n
ot known`
Solution: Add a line with `127.0.0.1 nix-docker` to `/etc/hosts`