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forgejo-docs/docs/developer/infrastructure.md
Earl Warren 8058edc2a0
developer: infrastructure: IP & port forwarding
2023-12-10 14:48:45 +01:00

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title license
Hardware infrastructure CC-BY-SA-4.0

Codeberg

Codeberg provides a LXC container with 48GB RAM, 24 threads and SSD drive to be used for the CI. A Forgejo Runner is installed in /opt/runner and registered with a token obtained from https://codeberg.org/forgejo. It does not allow running privileged containers or LXC containers for security reasons. The runner is intended to be used for pull requests, for instance in https://codeberg.org/forgejo/forgejo.

Octopuce

Octopuce provides hardware managed by the devops team. It can be accessed via a VPN which provides a DNS for the octopuce.forgejo.org internal domain.

The VPN is deployed and upgraded using the following Enough command line:

$ mkdir -p ~/.enough
$ git clone https://forgejo.octopuce.forgejo.org/forgejo/enough-octopuce ~/.enough/octopuce.forgejo.org
$ enough --domain octopuce.forgejo.org service create openvpn

Hetzner

All hardware is running Debian GNU/linux bookworm.

hetzner01

https://hetzner01.forgejo.org runs on an EX101 Hetzner hardware.

There is no backup, no redundancy and is dedicated to Forgejo runner instances. If the hardware reboots, the runners do not restart automatically, they have to be restarted manually.

It hosts LXC containers setup with lxc-helpers:

The runners are installed with something like:

sudo wget -O /usr/local/bin/forgejo-runner-3.2.0 https://code.forgejo.org/forgejo/runner/releases/download/v3.2.0/forgejo-runner-3.2.0-linux-amd64
sudo chmod +x /usr/local/bin/forgejo-runner-3.2.0

hetzner{02,03}

https://hetzner02.forgejo.org & https://hetzner03.forgejo.org run on EX44 Hetzner hardware.

A vSwitch is assigned via the Robot console on both servers and configured in /etc/network/interfaces for each of them with something like:

auto enp5s0.4000
iface enp5s0.4000 inet static
  address 10.53.100.2
  netmask 255.255.255.0
  vlan-raw-device enp5s0
  mtu 1400

DRBD

DRBD is configured with hetzner02 as the primary and hetzner03 as the secondary:

resource r0 {
    net {
        # A : write completion is determined when data is written to the local disk and the local TCP transmission buffer
        # B : write completion is determined when data is written to the local disk and remote buffer cache
        # C : write completion is determined when data is written to both the local disk and the remote disk
        protocol C;
        cram-hmac-alg sha1;
        # any secret key for authentication among nodes
        shared-secret "***";
    }
    disk {
        resync-rate 1000M;
    }
    on hetzner02 {
        address 10.53.100.2:7788;
        volume 0 {
            # device name
            device /dev/drbd0;
            # specify disk to be used for devide above
            disk /dev/nvme0n1p5;
            # where to create metadata
            # specify the block device name when using a different disk
            meta-disk internal;
        }
    }
    on hetzner03 {
        address 10.53.100.3:7788;
        volume 0 {
            device /dev/drbd0;
            disk /dev/nvme1n1p5;
            meta-disk internal;
        }
    }
}

The DRBD device is mounted on /var/lib/lxc.

In /etc/fstab there is a noauto line:

/dev/drbd0 /var/lib/lxc ext4 noauto,defaults 0 0

To prevent split brain situations a manual step is required at boot time, on the machine that is going to be the primary, which is hetzner02 in a normal situation.

sudo drbdsetup status
sudo drbdadm primary r0
sudo mount /var/lib/lxc
sudo lxc-autostart start
sudo lxc-ls -f
sudo drbdsetup status

Fast storage on /srv

The second disk on each node is mounted on /srv and can be used when fast storage is needed and there is no need for backups, such as Forgejo runners.

LXC

LXC is setup with lxc-helpers.

The /etc/default/lxc-net file is the same on both machines:

USE_LXC_BRIDGE="true"
LXC_ADDR="10.6.83.1"
LXC_NETMASK="255.255.255.0"
LXC_NETWORK="10.6.83.0/24"
LXC_DHCP_RANGE="10.6.83.2,10.6.83.254"
LXC_DHCP_MAX="253"
LXC_IPV6_ADDR="fc16::216:3eff:fe00:1"
LXC_IPV6_MASK="64"
LXC_IPV6_NETWORK="fc16::/64"
LXC_IPV6_NAT="true"

Public IP addresses

The public IP addresses attached to the hosts are not failover IPs that can be moved from one host to the next. The DNS entry needs to be updated if the primary hosts changes.

When additional IP addresses are attached to the server, they are added to /etc/network/interfaces like 65.21.67.71 and 2a01:4f9:3081:51ec::102 below.

auto enp5s0
iface enp5s0 inet static
  address 65.21.67.73
  netmask 255.255.255.192
  gateway 65.21.67.65
  # route 65.21.67.64/26 via 65.21.67.65
  up route add -net 65.21.67.64 netmask 255.255.255.192 gw 65.21.67.65 dev enp5s0
  # BEGIN code.forgejo.org
  up ip addr add 65.21.67.71/32 dev enp5s0
  up nft -f /home/debian/code.nftables
  down ip addr del 65.21.67.71/32 dev enp5s0
  # END code.forgejo.org

iface enp5s0 inet6 static
  address 2a01:4f9:3081:51ec::2
  netmask 64
  gateway fe80::1
  # BEGIN code.forgejo.org
  up ip -6 addr add 2a01:4f9:3081:51ec::102/64 dev enp5s0
  down ip -6 addr del 2a01:4f9:3081:51ec::102/64 dev enp5s0
  # END code.forgejo.org

Port forwarding

Forwarding a port to an LXC container can be done with /home/debian/code.nftables for the public IP of code.forgejo.org (65.21.67.71) to the private IP of the code LXC container:

add table ip code;
flush table ip code;
add chain ip code prerouting {
  type nat hook prerouting priority 0;
  policy accept;
  ip daddr 65.21.67.71 tcp dport { ssh } dnat to 10.6.83.195;
};

with nft -f /root/code.nftables.

Reverse proxy

The reverse proxy forwards to the designated LXC container with something like the following in /etc/nginx/sites-enabled/code.forgejo.org, where 10.6.83.195 is the IP allocated to the LXC container running the web service:

server {

    server_name code.forgejo.org;

    location / {
        proxy_pass http://10.6.83.195:8080/;
        client_max_body_size 2G;
	#
	# http://nginx.org/en/docs/http/websocket.html
	#
        proxy_set_header Connection $http_connection;
        proxy_set_header Upgrade $http_upgrade;
        include proxy_params;
    }
}

The LE certificate is obtained once and automatically renewed with:

sudo certbot -n --agree-tos --email contact@forgejo.org -d code.forgejo.org --nginx

Containers

It hosts LXC containers setup with lxc-helpers.

  • code on hetzner02

    Dedicated to https://code.forgejo.org

    Upgrades checklist:

    • change the image= in /home/debian/run-forgejo.sh
    • docker stop forgejo
    • sudo rsync -av --numeric-ids --delete --progress /srv/forgejo/ /root/forgejo-backup/
    • docker rm forgejo
    • bash -x /home/debian/run-forgejo.sh
    • docker logs -n 200 -f forgejo

  • runner-forgejo-helm on hetzner03

    Dedicated to https://codeberg.org/forgejo-contrib/forgejo-helm and running from an ephemral disk

Uberspace

The website https://forgejo.org is hosted at https://uberspace.de/. The https://codeberg.org/forgejo/website/ CI has credentials to push HTML pages there.

Installing Forgejo runners

Preparing the LXC hypervisor

git clone https://code.forgejo.org/forgejo/lxc-helpers/

lxc-helpers.sh lxc_prepare_environment
sudo lxc-helpers.sh lxc_install_lxc_inside 10.120.13

Creating an LXC container

lxc-helpers.sh lxc_container_create forgejo-runners
lxc-helpers.sh lxc_container_start forgejo-runners
lxc-helpers.sh lxc_container_user_install forgejo-runners $(id -u) $USER
lxc-helpers.sh lxc_container_run forgejo-runners -- sudo --user debian bash
sudo apt-get update
sudo apt-get install -y wget docker.io emacs-nox
sudo usermod -aG docker $USER # exit & enter again for the group to be active
lxc-helpers.sh lxc_prepare_environment
sudo wget -O /usr/local/bin/forgejo-runner https://code.forgejo.org/forgejo/runner/releases/download/v2.0.4/forgejo-runner-amd64
sudo chmod +x /usr/local/bin/forgejo-runner
echo 'export TERM=vt100' >> .bashrc

Creating a runner

Multiple runners can co-exist on the same machine. To keep things organized they are located in a directtory that is the same as the url from which the token is obtained. For instance DIR=codeberg.org/forgejo-integration means that the token was obtained from the https://codeberg.org/forgejo-integration organization.

If a runner only provides unprivileged docker containers, the labels should be LABELS=docker:docker://node:16-bullseye,ubuntu-latest:docker://node:16-bullseye.

If a runner provides LXC containers and unprivileged docker containers, the labels should be LABELS=docker:docker://node:16-bullseye,self-hosted.

mkdir -p $DIR ; cd $DIR
forgejo-runner generate-config > config.yml
## edit config.yml
## Obtain a $TOKEN from https://$DIR
forgejo-runner register --no-interactive --token $TOKEN --name runner --instance https://codeberg.org --labels $LABELS
forgejo-runner --config config.yml daemon |& cat -v > runner.log &

codeberg.org config.yml

  • fetch_timeout: 30s # because it can be slow at times
  • fetch_interval: 60s # because there is throttling and 429 replies will mess up the runner
  • cache enabled: false # because codeberg.org is still v1.19