Difference between revisions of "Machine/bender"

Revision as of 22:22, 7 November 2021

Hostnames

bender.sugarlabs.org

Hardware

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

Info

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.

Admins

Alex Perez, MrBIOS on #sugar Libera.chat IRC network
Bernie Innocenti, bernie on #sugar Libera.chat IRC network

Network configuration

Network configuration is managed via netplan. To modify, do:

vi /etc/netplan/bender.yaml
netplan generate
netplan apply

Bender is globally accessible through a public, static IPv4 address. IPv6 configuration is being discussed with Sonic net admins.

The br0 bridge is created libvirt on startup with /etc/libvirt/qemu/networks/default.xml. This is a NAT interface and is not meant for VMs directly

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

@@ Line 27: / Line 27: @@
 == Network configuration ==
-Develer has a 10mbit up/downlink and asks to limit bandwidth usage from hosted services.
+Network configuration is managed via [https://netplan.io/ netplan]. To modify, do:
-There is a traffic shaper, but it may have trouble shaping 6to4 traffic.
-Bender is globally accessible through public, static IPv4 address.
+ vi /etc/netplan/bender.yaml
+ netplan generate
+ netplan apply
-The virbr0 bridge is created by libvirt on startup with <code>/etc/libvirt/qemu/networks/default.xml</code>.
+Bender is globally accessible through a public, static IPv4 address.
-Libvirt does not yet support assigning IPv6 addresses to bridges, therefore we do this in <code>/etc/rc.local</code>:
+IPv6 configuration is being discussed with Sonic net admins.
- 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
+The br0 bridge is created  libvirt on startup with <code>/etc/libvirt/qemu/networks/default.xml</code>. This is a NAT interface and is not meant for VMs directly
-daemon. The contents of <code>/etc/radvd.conf</code> 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"