I know this is the preferred way to do it now, but I sometimes worry that abstracting where things are configured in an is that configures everything in a file.

You used to only have to check two places to change a hostname.

Oldmanyellsatsky.jpg

Cgroups is not a really a security feature (from what I understand). It is about controlling process priority, hierarchy, and resources limiting (among other things).

With respect, I think you misunderstand what gvisor does and containerization in general. cgroups2 is the isolation mechanism used by most modern Linux containers, including docker and lxc both. It is similar to the jail concept in BSD, and loosely to chroot. It limits child process access to files, devices, memory, and is the basis for how subprocesses are secured against accessing host resources without the permission to do so.

Gvisor adds more layers of control over this system by adding a syscall control plane to prevent a container from accessing functions in the host’s kernel that might not be protected by cgroups2 policy. This lessens the security risk of the host running a cutting-edge or custom kernel with more predictable results, but it comes with caveats.

Gvisor is not a universally “better” option, especially for homelab, where environment workloads vary a lot. Gvisor comes with an IO performance penalty, incompatibility with selinux, and its very strength can prevent containers from accessing newer syscalls on a cutting edge host kernel.

My original comment was that ultimately, there is no blanket answer for “how secure is my virtualization stack”, because such a decision should be made on a case-by-case basis. And any choice made by a homelabber or anyone else should involve some understanding of the differences between each type.

Subjective to security practice. There are more appropriate factors than blanket statements on a technology’s inherent “security” when deciding the format and shape of virtual software spaces.

in a memory safe language

Ultimately, the implementation is more important than the underlying code when it comes to containers. cgroups2 works the same for gvisor as it does for LXC.

I’ve tried it. It performs poorly.

For context, I’ve also been using ZFS since Solaris.

I was wrong about compression on datasets vs pools, my apologies.

By “almost no impact” (for compression), I meant well under 1% penalty for zstd, and almost unmeasurable for lz4 fast, with compression efficiency being roughly the same for both lz4 and zstd. Here is some data on that.

Lz4 compression on modern (post-haswell) CPUs is actually so fast, that lz4 can beat non-compressed writes in some workloads (see this). And that is from 2015.

Today, there is no reason to turn off compression.

I will definitely look into the NFS integrations for ZFS, I use NFS (exports and mounts) extensively, I wonder what I’ve been missing.

Anyway, thanks for this.

The BGW320-500 has no “soft” factory reset. If this is required it is always requested by a tech for the user to carry out using reset switch or they send a tech to do it.

They are lying to you.

With respect, most of this comment is wrong.

• Both lz4 and zstd have almost no performance impact on modern hardware.
• compression acts on blocks in ZFS, therefore it is enabled at the pool level
• ZFS does indeed need to allocate some space at the front and end of a pool for slop, metaslab, and metadata. I think you are confusing filesystem and datasets.

Also remember that many permissions like nfs export settings are done on a per filesystem basis

• I’m not sure what you’re trying to say about NFS and ZFS, here but this is completely false, even if you mean datasets.

OK, well it’s not harming anything, so if you’re game to learn, by all means.

When you look at traffic on a public interface, besides learning what to filter out that is just normal (probes, crawls, etc from legit sources), but you also will run into badly-formed TCP traffic:

Martian packets: https://en.wikipedia.org/wiki/Martian_packet IP spoofing: https://en.wikipedia.org/wiki/IP_address_spoofing (I used to have a better resource for this,I’ll try to find it)

How RPC works: https://pentest.co.uk/labs/research/researching-remote-procedure-call-rpc-vulnerabilities/

That should help clarify a lot of what you’ll see in traffic on your segment.

You may also want to briefly read about how CDNs work, you’ll see a lot of akamai and cloudflare traffic too.

Running suricata on your wan interface is just generating a ton of noise and will be really confusing for you if you haven’t reviewed packet inspection alerts before. Not a lot of value in it unless you have many users “phoning home”.

Just run it on the lan interface.

Your approach of deny all until something complains is pretty much the most solid way to get a grip on security.

I assess and recommend security practices for a living, and I would say the most important first step is understanding where your data lives and where it goes. Once you know that, the rest is relatively easy with the tools available to us.

Op is running suricata

Caliber web isn’t two separate applications, it’s a calibre-compatible database served via http. There is no desktop “calibre” involved.

There is integrated koreader sync, though.

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I also find value in this.

Lately I get a lot of flack for running Debian with xfce but it looks and acts the same every time.

I’ve been through my various stages of customizing and living on the bleeding edge. But now that i have my wish and I work in linux daily, I just want the os to stay out of the way.

You can process these with bash string manipulation alone, but sed and awk will do this pretty easy.

That’s still true, but performance has changed a lot since Jim Salter wrote that. There was a time When 2x mirrored vdevs (the equivalent to raid 10) would have been preferable to raidz2, but performance of both ZFS and disks themselves has improved enough that there wouldn’t be much of a difference in performance between these two in a home lab.

Personally, I agree with you in that mirrors are preferable, mostly because I don’t really need high availability as much as I want an easier time restoring if a disk fails.

just like ssh -X

No, that’s not what’s happening. X11 forwarding is telling the server to treat a TCP socket as a display, and after passing xauth, the frames are just shoveled into an ssh session. Waypipe is serializing Wayland messages so they can be redirected to multiple portals, specifically over a socket. They don’t really work the same at all.

I didn’t know XFCE supported Wayland

Some parts of xfce do, xfwm4 does not.

so I casually ran vncserver, which launched xfce4-session

This is because your vnc is configured to do so.

except that it attached itself to the Wayland display (proxied to my local machine) rather than X display of TigerVNC. And here come the full XFCE right to my local machine (which is running Plasma).

This part doesn’t make a lot of sense.

If invoking xfce4-session works, it means you are doing so over vnc, not waypipe.

I’ll ask your mom.

Most fiber services register the sfp/sfp+ module. it is much cheaper, easier and usually not against the terms of service to just use the isp-provided sfp in your own routing device instead of messing with OLT settingw and custom firmware on a $160 WAS.

The logo is bad. “Dogshit” is appropriate here.

All of this produces a feeling of anguish… Maybe I cannot stand knowing that this could be the standard everywhere.

I have similar feelings about the lack of alcohol taxation and the low rate of rice cooker adoption in the west.

You are struggling to accept the imperfect world as it is. You should stop introspecting on the symptoms and try to figure out why you are unhappy with other people’s choices.