[SOLVED] failed to install snap into LXC: "Failed to send reload request: No such file or directory"

[neur0mancer]

Disclaimer: I'm referring to this post:

https://forum.proxmox.com/threads/cant-install-snap-in-lxc-container.68708/

Peopel solved the problem there, but I still stuck with installation of Firefox into an LXC using apt/snap. So, here we go again

~~~

I tried installing firefox on a Ubuntu container (latest updates/upgrades done). Those are the steps:

sudo apt install squashfuse fuse snapd -y \
sudo mkdir /lib/modules

sudo apt install firefox

I also tried

sudo snap install firefox

Also, as recommended at some places, I tried issuing the commands again.

The Container is also prepared as recommended:

mandatory reboots are done, FUSE box in options is active, container is "unprivileged" and the following options are set:

lxc.mount.entry = /dev/fuse dev/fuse none bind,create=file,optional
lxc.mount.auto=cgroup:rw

I have to mention, though I think it does not make any difference: I run the container as a clone of a custom-template, because I got sick preparing the naked container again for every new try - I tried it with dozens containers now to find the issue.

However, I always end up with this error as mentioned above:

- Setup snap "firefox" (3416) security profiles (cannot setup udev for snap "firefox": cannot reload udev rules: exit status 1
udev output:
Failed to send reload request: No such file or directory
)
- Setup snap "firefox" (3416) security profiles (cannot reload udev rules: exit status 1
udev output:
Failed to send reload request: No such file or directory
)
- Setup snap "firefox" (3416) security profiles for auto-connections (cannot reload udev rules: exit status 1
udev output:
Failed to send reload request: No such file or directory
)

According to this post in the snap-board, it's not possible at all in a LXC container? I cannot believ that, actually - because a lot of people seem to be able to solve it:

https://forum.snapcraft.io/t/unable-to-install-snap-from-store-or-locally/4629

I am apparantly not the only one, it seems like this problem pops up again in the last weeks, months, like here:

https://forum.proxmox.com/threads/snap-fehler-in-einem-lcx-container.72228/

 

[neur0mancer]

OK, it can be nailed down to udev, apparently. systemctl status udev reveals, that the service is not running:

* systemd-udevd.service - Rule-based Manager for Device Events and Files
     Loaded: loaded (/lib/systemd/system/systemd-udevd.service; static)
    Drop-In: /usr/lib/systemd/system/systemd-udevd.service.d
             `-syscall-architecture.conf
     Active: inactive (dead)
TriggeredBy: * systemd-udevd-control.socket
             * systemd-udevd-kernel.socket
  Condition: start condition failed at Fri 2023-12-01 15:51:30 UTC; 6min ago
             `- ConditionPathIsReadWrite=/sys was not met
       Docs: man:systemd-udevd.service(8)
             man:udev(7)

Dec 01 15:51:30 firefox systemd[1]: systemd-udevd.service - Rule-based Manager for Device Events and Files was skipped because of an unmet condition check (Con>

I'm trying to wrap my head around it, so let's check the configuration for the service under /lib/systemd/system/systemd-udevd.service;

[Unit]
Description=Rule-based Manager for Device Events and Files
Documentation=man:systemd-udevd.service(8) man:udev(7)
DefaultDependencies=no
After=systemd-sysusers.service systemd-hwdb-update.service
Before=sysinit.target
ConditionPathIsReadWrite=/sys

Let's manually reload the configuration via udevadm control --reload or udevadm control --reload-rules

Failed to send reload request: No such file or directory

Strange things happen. At some point I also got this error message returned (I cannot reproduce it yet)

Failed to send reload request: Connection refused

 

[neur0mancer]

OK, what a ride.. I started udev manually via

/lib/systemd/systemd-udevd --daemon

Now I was able to install firefox:

sudo snap install firefox

So, for some reason the udev is not properly implemented into the cotainer (it's the latest Ubuntu version). Manually running UDEV solves it.

 

[cvhideki]

Proxmox host, edit the config file at /etc/pve/lxc/<CTID>.conf

#nano /etc/pve/lxc/<CTID>.conf
features: mount=fuse,nesting=1
lxc.mount.entry: /dev/fuse dev/fuse none bind,create=file,optional
lxc.mount.auto: cgroup:rw

Next step open lxc container, install app, after switch off
also can create folder

sudo mkdir /lib/modules

sudo apt install squashfuse fuse
sudo poweroff

After run lxc and try install snapd, and snap install --classic certbot

sudo apt-get update -y
sudo apt install snapd -y
sudo snap install core; snap refresh core
sudo snap install --classic certbot

 

[neur0mancer]

I did everything of that, except

sudo snap install core; snap refresh core
sudo snap install --classic certbot

Will try later on a fresh machine! Thanks!