Busk: Created page with "To sync your SSH configuration and keys across your LXD cluster (the Ubuntu 24.04 node and your older 22.04 nodes), you can use a combination of LXD's built-in file push a..."

2026-03-20T03:26:12Z

Created page with "To sync your SSH configuration and keys across your LXD cluster (the Ubuntu 24.04 node and your older 22.04 nodes), you can use a combination of **LXD's built-in file push** a..."

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To sync your SSH configuration and keys across your LXD cluster (the Ubuntu 24.04 node and your older 22.04 nodes), you can use a combination of **LXD's built-in file push** and a simple **Bash alias**.

Since your 6-disk ZFS mirror is likely your "main" node, we’ll use it as the source of truth.

### 1. The Manual Sync (Quickest)
LXD allows you to push files directly into a container or across nodes if they are part of the same cluster. If you want to push your updated `config` to a specific container:

```bash
lxc file push ~/.ssh/config my-alpine-container/root/.ssh/config
```

### 2. The Cluster-Wide Sync Script
If you want to ensure every node in your cluster has the same SSH shortcuts, you can run this loop from your primary node. It iterates through all nodes and updates their local `~/.ssh/config`.

```bash
for node in $(lxc cluster list --format csv -c Name); do
scp ~/.ssh/config $node:~/.ssh/config
done
```

---

### 3. Using "SSH Agent Forwarding" (Recommended)
Instead of copying your **Private Keys** to every node (which is a security risk), you should use **Agent Forwarding**. This allows you to keep your keys on your local machine but "lend" them to the cluster nodes as you jump between them.

**Update your `~/.ssh/config` on your local machine:**
```text
Host lxd-cluster-*
ForwardAgent yes
User busk
IdentityFile ~/.ssh/id_ed25519_personal
```

**How it works:**
1. You SSH into Node A.
2. From Node A, you want to `git clone` or SSH into Node B.
3. Node A "asks" your local machine to sign the request using your key.
4. **The private key never leaves your laptop.**

---

### 4. Syncing via a Git "Dotfiles" Repo
Since we just set up your Git SSH access, the most professional way to manage this is to create a private **"dotfiles"** repository.

1. **Create a private repo** on GitHub called `dotfiles`.
2. **Push your config:** ```bash
git add ~/.ssh/config
git commit -m "update ssh config"
git push
```
3. **Pull on other nodes:** On any new node in your cluster, just `git pull` to get your latest shortcuts and host definitions.

---

### 5. Security Warning for ZFS Pools
If you are syncing these files to a directory on your `tank` pool, ensure the ZFS dataset permissions are restricted. SSH will fail to work if the permissions are too "open" (e.g., if a group has write access).

```bash
# Ensure the ZFS mount for your home dir is strict
sudo chmod 700 /home/busk/.ssh
```

---

### Summary Checklist
| Method | Best For... | Security Level |
| :--- | :--- | :--- |
| **Agent Forwarding** | Jumping between nodes | **High** (Keys stay local) |
| **LXC File Push** | Quick fixes to containers | **Medium** |
| **Git Dotfiles** | Long-term cluster management | **High** (If repo is private) |

**Would you like me to show you how to automate the "Git Pull" of your config files every time you log into a node?**

LXD security luks ssh sync - Revision history

Busk: Created page with "To sync your SSH configuration and keys across your LXD cluster (the Ubuntu 24.04 node and your older 22.04 nodes), you can use a combination of **LXD's built-in file push** a..."

Busk: Created page with "To sync your SSH configuration and keys across your LXD cluster (the Ubuntu 24.04 node and your older 22.04 nodes), you can use a combination of LXD's built-in file push a..."