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cloud_hypervisor.md

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Cloud Hypervisor Integration

OPS works well with Cloud Hypervisor starting from v32.0. OPS doesn't currently interact with the Cloud Hypervisor api but can produce disk images for you to use with it.

To run:

You should replace the kernel.img file with the location of your kernel and the my_img.img with the unikernel disk image of choice:

./cloud-hypervisor \
  --cpus "boot=1,max=2" \
  --memory size=256M \
  --rng "src=/dev/urandom" \
  --console off \
  --serial tty \
  --disk path=/Users/bob/.ops/images/my_img.img \
  --kernel /Users/bob/.ops/0.1.45/kernel.img \
  --net tap=tap0,mac=AA:C6:00:00:00:01 \
  --api-socket /tmp/ch-api.socket

Note: you can use --serial file=/tmp/ch-serial.log instead of --serial tty

You should have dhcp listen on your tap:

sudo apt-get install isc-dhcp-server

Create a tap device:

sudo ip tuntap add dev tap0 mode tap
sudo ip addr add 10.0.2.1/24 dev tap0
sudo ip link set tap0 up

Sample dhcp config:


option domain-name "example.org";
option domain-name-servers ns1.example.org, ns2.example.org;

default-lease-time 600;
max-lease-time 7200;

ddns-update-style none;

INTERFACES="tap0";

subnet 10.0.2.0 netmask 255.255.255.0 {
    option routers 10.0.2.1;
    range 10.0.2.10 10.0.2.255;
}

dhcpd -f -d tap0

If this is setup correctly you should see some arp requests fly by:

bob@box:/home/eyberg~ dhcpd -f -d tap0
Internet Systems Consortium DHCP Server 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Config file: /etc/dhcp/dhcpd.conf
Database file: /var/lib/dhcp/dhcpd.leases
PID file: /var/run/dhcpd.pid
lease 10.0.2.0: no subnet.
Wrote 0 leases to leases file.
Listening on LPF/tap0/96:ea:ca:e0:76:63/10.0.2.0/24
Sending on   LPF/tap0/96:ea:ca:e0:76:63/10.0.2.0/24
Sending on   Socket/fallback/fallback-net
Server starting service.
DHCPDISCOVER from aa:c6:00:00:00:01 via tap0
DHCPOFFER on 10.0.2.10 to aa:c6:00:00:00:01 via tap0
DHCPREQUEST for 10.0.2.10 (10.0.2.1) from aa:c6:00:00:00:01 via tap0
DHCPACK on 10.0.2.10 to aa:c6:00:00:00:01 (uniboot) via tap0
DHCPREQUEST for 10.0.2.10 from aa:c6:00:00:00:01 (uniboot) via tap0
DHCPACK on 10.0.2.10 to aa:c6:00:00:00:01 (uniboot) via tap0
DHCPREQUEST for 10.0.2.10 from aa:c6:00:00:00:01 (uniboot) via tap0
DHCPACK on 10.0.2.10 to aa:c6:00:00:00:01 (uniboot) via tap0
DHCPREQUEST for 10.0.2.10 from aa:c6:00:00:00:01 (uniboot) via tap0
DHCPACK on 10.0.2.10 to aa:c6:00:00:00:01 (uniboot) via tap0

and you should see the unikernel snag an ip:

Server started on port 8080
assigned: 10.0.2.10
assigned: 0.0.0.0