• 2 Posts
  • 29 Comments
Joined 2 years ago
Cake day: July 14th, 2024
  • buedi@feddit.orgtoSelfhosted@lemmy.world•Docker networking help (vlans)English
    1·
    2 months ago

    The .10 or .20 just advises Docker to create that specific Subinterface automatically. In my example ip link will show new interfaces called br0.10 and br0.20 after creating the macvlan networks for VLAN IDs 10 and 20. You do not need to adjust your Netplan config when doing it like that. I would even assume that you are not allowed to define VLAN ID 10 and 20 in that particular case also in Netplan. I would expect that this will cause issues. Also see https://docs.docker.com/engine/network/drivers/macvlan/ in the 802.1Q trunk bridge mode section.

    There are probably multiple ways to do all of this, but this is how I did it and it works for me since a few years without touching it again. All VLANs are separated from each other and no VLAN has access to the LAN side. Everything is forced to go through tagged VLANs via the switch to the Firewall, where I then create rules to allow / deny traffic from / to all my networks and the Internet.

    For me, this setup is very simple to re-implement should my Host go down. No special configuration in Netplan is needed. Only create the Docker Networks and start up my stacks again.

  • buedi@feddit.orgtoSelfhosted@lemmy.world•Docker networking help (vlans)English
    4·
    2 months ago

    I can’t see your full setup / config from here, but a) you are not overengineering that. Using VLANs to segment networks is a very good practice. And although Docker (nor Podman) allow macvlan when running rootless, my gutfeeling tells me that segmenting my network takes priority over running rootless, because I think that attack vectors by traversing networks are much more common that breaking out of a container into the host. But this is just my gutfeeling. b) I think I run here what you want to achieve, so I try to explain what I did.

    My Setup is similar to yours. OPNsense (OpenWRT before that), a Switch that is capable of VLAN and a Ubuntu Server with a single NIC that hosts all the Compose stacks.

    1. You already configured your VLANs in OPNsense, so I will just mention that I created mine via Interface -> Devices -> VLAN on the LAN Interface of my OPNsense and then used the Assignments to finally make them available. On the OPNSense each one gets a static IP from the respective Network I defined for the VLAN.
    2. On the Docker Host, in Netplan I configured the single NIC I have as a Bridge. I cannot remember if that was necessary or if I just planned ahead, should I add a 2nd NIC later on, to prevent that I need to reconfigure the whole networking again. Of course that Bridge sits in my LAN and the Netplan Config looks like this:
    network:
  ethernets:
    eno1:
      dhcp4: no
  version: 2
  bridges:
    br0:
      addresses:
      - 192.x.x.3/24
      nameservers:
        addresses:
        - 192.x.x.x
        search:
        - my.lan
        - local
      routes:
      - to: default
        via: 192.x.x.1
      interfaces:
        - eno1
    1. Now that the Docker Containers can use the VLANs, I had to create Docker Networks as macvlan like this:
    docker network create -d macvlan --subnet=192.x.10.0/24 --gateway=192.x.10.1 -o parent=br0.10 vlan10
docker network create -d macvlan --subnet=192.x.20.0/24 --gateway=192.x.20.1 -o parent=br0.20 vlan20
    1. Now for a Container to make use of those Networks, you have to define them as External in the Compose Stack like this:
    services:
  my-service:
    image: blah
    ...
    networks:
      vlan10:

networks:
  vlan10:
    name: vlan10
    external: true

    In 4. you have the option to not define an ipv4_address in the networks section. Then Docker will just pick its own addresses when the containers start. Letting OPNsense assign IP addresses dynamically in such a VLAN is something that did not work for me. So either you let Docker pick the IPs when starting a stack, or you define your IP addresses in the stack. If you do the latter, you have to do it for every stack that ever joins that VLAN, otherwise Docker might pick an IP that you already assigned manually and that stack will not start.

    I also wanted to have some services running directly in the LAN via Docker. This setup is a bit more involved and requires you to create a SHIM Network, otherwise the Docker Host itself will not be capable of accessing Containers running in the LAN Network. This was the case for my Pi-Hole for example, that I wanted to have an IP in my LAN Network and had to be reachable by the Docker Host itself too. There is a very good post about Macvlan and SHIM Networks in this blog: https://blog.oddbit.com/post/2018-03-12-using-docker-macvlan-networks/

    I hope this helps. Do not give up. Segmenting your Networks is important, especially if you plan to publish some services over the Internet.

  • buedi@feddit.orgtohomeassistant@lemmy.world•Dashboard - What functions/information turned out to be helpful?English
    3·
    3 months ago

    Just a thought about the Switch. Maybe you could plug it into a Powersocket that is monitored in HA, like a NOUS A1-T? If power draw goes up, the Switch is on. This could easily be “hacked” by the kids by plugging the switch into another Powersocket. But if the Switch has a reliable Standby power draw, that could be monitored too. If that is zero, the someone is cheating :-)

    Monitoring the Switch when not docked, could maybe done via WiFi? Check if the MAC (or the IP if fixed via DHCP) is online or not. Of course this also helps if the Switch is always Online when used. I do not have one, so I do not know.

  • buedi@feddit.orgtoSelfhosted@lemmy.world•Self hosting Signal serverEnglish
    31·
    9 months ago

    Thanks for pointing out Simplex Chat, I did not know that it exists. It looks very interesting, but reading more about it, they will have to implement some kind of business model in the future. My fear is, that even when self-hosting, some features will be behind a paywall in the future, so it is not a solution I would switch to… switching to a new messenger is a long-term endeavour. It is hard to convince friends to move over too, let alone switching to a new one every few years. That’s near impossible. But the technology of Simplex looks really interesting and reading through the Docs it makes the impression that it is very polished.

  • buedi@feddit.orgtoFree and Open Source Software@beehaw.org•Is there a good OSS grocery list?
    2·
    1 year ago

    Back on my PC and a few more words about https://davideshay.github.io/groceries/ (Specifically Clementines).

    Why do we use it and why do we think it is the best?

    • You have list groups under which you have your stores that fit to your list groups (like food, gardening…). Items you create belong to a list group and can be shown in various lists (shops) under this group. Did not get your favourite Cheese in Shop A? Item will stay on the list for Shop B. Found it in Shop A already? The item is gone on the list for Shop B.
    • For each list, you can create aisles and sort them like they are in that particular shop. This makes it possible to run through the shop in one line and get everything I need in the quickest time possible. No distractions or backtracking.
    • It has real-time sync. We both go shopping in 2 shops for the same lists? Items get ticked off in real-time. Partner puts something on the list? I see it immediately.
    • It has offline functionality. No cell reception in the shop? You shop offline. Cell reception back? It syncs automatically.
    • It has a native Android app and a responsive Web UI, whatever fits to you. And both support offline usage.
    • You can add pictures to items. Partner wants THAT particular cheese and then you stand in front of the 1km long cheese shelf and have no idea how that thing looks? Just add a picture to an item, problem fixed.
    • You ticked off an item by accident from the list and you have no idea what it was? Ticked off items stay on the list ticked off and you can bring them easily back. You are done with shopping? You can then fully clear the list of all ticked off items if you want to clean it up.

    The only downside is: It is a bit difficult to set up, but this is true for all services that use CouchDB as a database I ever set up. But it is worth it. This solution is super stable and the live sync was super usefull so many times.

    We use it for more than just shopping now. It also works great for a packing list when you go on vacation for example or basically everything else you need to “tick off a list”.

  • buedi@feddit.orgOPtoSelfhosted@lemmy.world•Performance comparison between various HypervisorsEnglish
    1·
    1 year ago

    Thank you very much. I spent another two hours yesterday reading up on that and creating other VMs and Templates, but I was not able yet to attach the Boot disk to a SCSI controller and make it boot. I would really liked to see if this change would bring it on-par with Proxmox (I wonder now what the defaults for Proxmox are), but even then, it would still be much slower than with Hyper-V or XCP-ng. If I find time, I will look into this again.

  • buedi@feddit.orgOPtoSelfhosted@lemmy.world•Performance comparison between various HypervisorsEnglish
    1·
    1 year ago

    I am neither working professionally in that field. To answer your question: Of course I would use whatever gives me the best performance. Why it is set like this is beyond my knowledge. What you basically do in Apache Cloudstack when you do not have a Template yet is: You upload an ISO and in this process you have to tell ACS what it is (Windows Server 2022, Ubuntu 24 etc.). From my understanding, those pre-defined OS you can select and “attach” to an ISO seem to include the specifics for when you create a new Instance (VM) in ACS. And it seems to set the Controller to SATA. Why? I do not know. I tried to pick another OS (I think it was called Windows SCSI), but in the end it ended up still being a VM with the disks bound to the SATA controller, despite the VM having an additional SCSI controller that was not attached to anything.

    This can probably be fixed on the commandline, but I was not able to figure this out yesterday when I had a bit spare time to tinker with it again. I would like to see if this makes a big difference in that specific workload.

  • buedi@feddit.orgOPtoSelfhosted@lemmy.world•Performance comparison between various HypervisorsEnglish
    5·
    1 year ago

    That’s a very good question. The testsystem is running Apache Cloudstack with KVM at the moment and I have yet to figure out how to see which Disk / Controller mode the VM is using. I will dig a bit to see if I can find out. Would be interesting if it is not SCSI to re-run the tests.

    Edit: I did a ‘virsh dumpxml <vmname>’ and the Disk Part looks like this:

      <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/mnt/0b89f7ac-67a7-3790-9f49-ad66af4319c5/8d68ee83-940d-4b68-8b28-3cc952b45cb6' index='2'/>
      <backingStore/>
      <target dev='sda' bus='sata'/>
      <serial>8d68ee83940d4b688b28</serial>
      <alias name='sata0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>

    It is SATA… now I need to figure out how to change that configuration ;-)