/dev/stderr tutorials/tech blog on linux,aws, storage, and more

ZFS Listing Snapshots

ZFS Listing Pools ZFS has been amazing - the ability to snapshot, rollback, clone and create incremental updates is amazing! When you're using ZFS, you may want to look at and sort your snapshots. But first, you may need to know what pools you have zpool list. ZFS Listing Datasets

ARCH VM resize root partition

First of all - back up your data!!! While we hope not to destroy your data, a single typo could nuke the VM. Of if there's an error in the instructions, etc. While this worked great for me several times, I can provide no guarantees that this will work nor

Truenas Keybindings

Being used to Ubuntu keybindings, I'm used to navigating the a line in the terminal with CTRL+LEFT and CTRL+RIGHT - but instead of the cursor moving left or right by one word at a time I see ;5D;5D;3D;3D appear in where my cursor is! And

proxmox

Mac VM disk resize

I have a MacOS VM running on Proxmox installed by using the instructions from Nicholas Sherlock Installing macOS 12 “Monterey” on Proxmox 7 – Nicholas SherlockNicholas Sherlock Menu and widgetsNicholas Sherlock I ran out of disk space for the VM and needed to add more. 1. Shutdown the MacOS VM 2.

proxmox

LXC Won't Start Debugging - (NFS disconnect)

On Proxmox I recent updated a debian container - and when I rebooted it it wouldn't start! In the browser I could see an error but no details. So I tried launching from the browser as pct start 103 Only to receive the error Failed to run lxc.hook.pre-start

arch

Proxmox Arch VM install

For security I wanted to expose a VM on Proxmox to the web rather than a container. Ubuntu is rather heavy, so I settled on an Arch Linux VM. Easiest way to install Arch - a prebuilt qcow2 file! This takes a just a couple minutes and requires minimal thought

OPNsense

Recover from OPNsense GUI lockout

Somehow a gateway change locked me out of my OPNsense GUI. I still have the Anti-Lockout Rule enabled in the firewall so this shouldn't have been possible, but alas... While I didn't have GUI access, I could still SSH. It turns out, OPNsense's main configuration file is /conf/config.xml.

proxmox

OpenVPN client in LXC

I followed the directions in https://pve.proxmox.com/wiki/OpenVPN_in_LXC but on any network load OpenVPN causes the connection to cut out... I had much better luck running a pfSense VM with OpenVPN installed on it and setting that pfSense instance as the gateway for my VM.

proxmox

Expand rpool Partition in Proxmox

My main Proxmox hard drive was filling up recently... NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH rpool 451G 396G 55G - - 32% 89% 1.00x ONLINE but I realized the partition was only half the size of the disk! (Proxmox was originally installed on a smaller

zfs

ZFS Finding Datasets with the most snapshots

Following up on Removing old ZFS snapshots, I had way too many snapshots... These commands will find all snapshots within the pool tank and count them by dataset.

wireguard

Wireguard returns "RTNETLINK answers: No such device" error -> low MTU

I use a Wireguard VPN to tunnel my traffic when on public wifi - but I couldn't use Wireguard from a recent network! This specific network was causing Wireguard to fail with the error message "RTNETLINK answers: No such device." I hadn't changed any configurations, so I was very confused

zfs

Removing old ZFS snapshots

I back up multiple computers to my Truenas instance hourly, but these snapshots hang around without an easy way to prune them (computers I back up include Ubuntu [http://www.devstderr.com/ubuntu-syncoid/] and Proxmox [https://www.devstderr.com/backup-proxmox-syncoid/]). But over a couple years one of my datasets seemed

proxmox

Proxmox - Clone VM/Container with NFS/CIFS mount

I have a NAS with storage I need to access from a VM. Proxmox requires this to be mounted directed in Proxmox and passed to the VM/Container as a mount point. This worked great until... I wanted to clone my VM. Well, it turns out Proxmox can't because of

proxmox

Backup Proxmox (single node, but including VM's!) with sanoid/syncoid on a schedule

First of all, I only use a one node Proxmox server meaning all my data is in a single pool. If you use multiple nodes this is probably more complex... I already backup my Ubuntu computer running ZFS using sanoid/syncoid so the most efficient way for me to back

systemd

systemd for persistent SOCKS proxy

I'd like one browser to connect through a VPN but my main internet connection (and other browsers) to go through my ISP. I already have a VPN running on a VM on Proxmox and figured I could use it as a proxy. But if the SSH connection dies the proxy

dns

DNS not resolving local IP

My ISP doesn't allow hairpinning and drops packets that I try to send to myself. So if I own example.com for the sake of routing to my network I can only use it externally (assuming I have a DNS record of pointing at my IP (say, 23.45.56.

DNS on Wireguard through wrong interface

On my client, DNS would work until I enabled Wireguard. It should have routed through the Wireguard tunnel (10.5.0.1 below) but it wasn't - or it was and it was hitting a dead end! So I ssh'd into the Wirgeuard server and checked the DNS resolution routes.

Wireguard VPN Endpoint with Anonymous Outgoing Traffic

I wanted a VPN endpoint that would allow me to: * access my network (say, my home network or my VPC) * browse the internet anonymously (such as through a commercial VPN like ExpressVPN, CyberGhost, PIA, or Mullvad) That way when traveling I didn't have to choose between accessing my internal network

arch

Arch on Proxmox using a prebuilt image

I needed a lightweight VM on proxmox (needed to be a VM, not a KVM for extra security) and I used to be familiar with arch. It was a VM to experiment with so I didn't want to take the time of a full set up and working through the

Dell Poweredge T340 - 128GB of RAM?

I came across the Dell T340 and between the small size, 8x3.5" bays, and a good used deal I found I thought it would be great as a NAS! I've been running Proxmox and a virtualized Truenas on it, but with 4 sticks of 16GB ECC Ram thought I

truenas

Nextcloud on Truenas - updating version 20 to version 23

How to update Nextcloud version 20 to version 23 on Truenas. Nexcloud is hosted in an iocage on Truenas

ghost

Ghost log location

Ghost is an amazing blogging platform used to host this blog! Bitnami even has a prebuilt AMI [https://bitnami.com/stack/ghost/cloud/aws/amis] to make it easy to get going with minimal setup. However, after a configuration change I ran into issues with Ghost [https://ghost.org/] not

ubuntu

Ubuntu ZFS bpool size

Preventing bpool space issues with Ubuntu running on ZFS.

freenas

Backup with Ubuntu (on ZFS) + sanoid/syncoid on a schedule

Managing Ubuntu backups with Sanoid/Syncoid is simple and can be automated in a crontab!

Sharing NFS with another linux computer

Before configuring the truenas console, create the directory and change the owner to nobody:nobody. (To prevent privilege elevation risks, it's safest for NFS to treat the NFS connection user as "nobody." sudo mkdir /mnt/nas/Share/nfs sudo chown -R nobody:nobody /mnt/nas/Share/nfs Follow the instructions