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
Bender and Papert are two twin KVM hosts donated to Sugar Labs in 2021 and hosted by Sonic in Santa Rosa, CA
Admins
- Alex Perez, MrBIOS on #sugar Libera.chat IRC network
- Bernie Innocenti, @bernie:matrix.org on Sugar Systems
Hosting
Hosted by Sonic in Santa Rosa CA
Network configuration
Network configuration is managed via netplan. To modify, do:
vi /etc/netplan/bender.yaml netplan generate netplan apply
IPv4
Bender is globally accessible through a public, static IPv4 address
Sonic assigned a /28 network to Sugar Labs. IP assignments are managed in our DNS configuration. Search for "Sonic IP pool" in masters/sugarlabs.org.zone.
- Usable IPv4 addresses: 192.184.220.210 ~ 192.184.220.222 (13 addresses)
- Subnet Mask: 255.255.255.240
- Default Gateway: 192.184.220.209
- DNS: 8.8.8.8, 8.8.4.4
IPv6
IPv6 configuration is a bit weird.
* Public block: 2001:5a8:601:f::/64 * Sonic gateway: 2001:5a8:5:3a::15:0/127 * Transport IP: 2001:5a8:5:3a::15:1/127
The gateway is configured to route all traffic for our netblock to the transport IP, which is currently assigned to bender.
Bridges
The br0 bridge is created at startup and shared with the virtual machines hosted on Bender. It gives the VMs unfiltered access to the external network. There's no DHCP, all machines must define a static IP configuration, taking care not to stomp onto each other.
There is also a virbr0 bridge created by libvirt on startup from /etc/libvirt/qemu/networks/default.xml. This is a NAT interface and is not meant for VMs directly serving on the Internet.
Guests simply need to be configured to accept IPv6 routing advertisements. The DNS must be assigned manually.
Virtualization
Virtual machines are KVM guests managed with libvirt.
Storage
All virtual disks come from a pool backed by the main LVM VG:
virsh # pool-define-as nvme-pool logical --source-name nvme-pool Pool nvme-pool defined virsh # pool-start nvme-pool Pool nvme-pool started virsh # pool-autostart nvme-pool Pool nvme-pool marked as autostarted virsh # pool-info nvme-pool Name: nvme-pool UUID: 5812819f-b8bf-484e-98fb-2e100fe83df2 State: running Persistent: yes Autostart: yes Capacity: 1.64 TiB Allocation: 250.00 GiB Available: 1.40 TiB
Disks assigned to VMs will appear here:
virsh # vol-list nvme-pool Name Path ----------------------------------------- aslo1-root /dev/nvme-pool/aslo1-root aslo1-srv /dev/nvme-pool/aslo1-srv backup /dev/nvme-pool/backup
Disks can be created, listed and deleted using the vol-* commands:
virsh # vol-create-as nvme-pool testvm-root 20G Vol testvm-root created virsh # vol-info testvm-root --pool nvme-pool Name: testvm-root Type: block Capacity: 20.00 GiB Allocation: 20.00 GiB virsh # vol-delete testvm-root --pool nvme-pool Vol testvm-root deleted
NOTE: avoid allocating large VM volumes as image file within the host's root filesystem, as they're slow and hard to manage. It's ok to use images for test VMs.