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  • HPE ProLiant DL360 Gen10 1RU server
    • Dual socket, current configuration has one CPU
  • Xeon Gold 5218R
    • 20 cores/40 threads
    • 2.1GHz base frequency, 4.0GHz max turbo frequency
    • 27.5MB of cache
  • 64GB RAM
  • 2TB NVMe SSD
  • Ubuntu 20.04.2 LTS


Owned by Sugar Labs, Inc. Hosted by Sonic in Santa Rosa, CA

Bender and Papert are two twin KVM hosts bought by Sugar Labs in 2021.


Network configuration

Develer has a 10mbit up/downlink and asks to limit bandwidth usage from hosted services. There is a traffic shaper, but it may have trouble shaping 6to4 traffic.

Bender is globally accessible through public, static IPv4 address.

The virbr0 bridge is created by libvirt on startup with /etc/libvirt/qemu/networks/default.xml. Libvirt does not yet support assigning IPv6 addresses to bridges, therefore we do this in /etc/rc.local:

ip addr add 2002:5395:9edc:1::1/64 dev virbr0

To automatically configure network and on the guests, Bender also runs radvd, the IPv6 Routing Advertisement daemon. The contents of /etc/radvd.conf are:

interface virbr0
       IgnoreIfMissing on;
       AdvSendAdvert on;
       MinRtrAdvInterval 30;
       MaxRtrAdvInterval 100;
       AdvDefaultPreference low;
       AdvHomeAgentFlag off;
       #bernie: subnet 1 of our /48 6to4 on Develer Consiagnet
       prefix 2002:5395:9edc:1::1/64
               AdvOnLink on;
               AdvAutonomous on;

Guests simply need to be configured to accept IPv6 routing advertisements. The DNS must be assigned manually.

Hosted VMs

All buildslaves currently run off bender as KVM virtual machines managed by libvirtd.

The machines are not globally addressable on IPv4 and are only reachable by IPv6. The IPv6 address is dynamically configured by radvd to a subnet of the public 6to4 net.

All the VMs are in /srv/images. See the README in the same directory.

They have been created with

virt-install --name buildslave-name --ram 512 \
--disk path=/srv/images/buildslave-name.img,size=10
--network network:default \
--location "mirror-http-address" \
--extra-args="console=tty0 console=ttyS0,115200n8 serial"