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docs: Update instructions to create custom ClearLinux image

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Based on recent update of the cloudguest image used by Cloud Hypervisor,
we identified some missing or incorrect details in the instructions.
This patch is here to fix those.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-10-17 22:06:49 -07:00 committed by Samuel Ortiz
parent defc33927f
commit 5822969afa
1 changed files with 11 additions and 2 deletions
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13
docs/custom-image.md
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@ -14,11 +14,19 @@ the custom image we want.
IMG_VERSION=$(curl https://download.clearlinux.org/latest)
# Get latest clear-kvm image:
wget -P $HOME/workloads/ https://download.clearlinux.org/current/clear-${IMG_VERSION}-kvm.img.xz
# Extract the image
unxz $HOME/workloads/clear-${IMG_VERSION}-kvm.img.xz
# Make sure cloud-hypervisor binary has CAP_NET_ADMIN capability set
sudo setcap cap_net_admin+ep cloud-hypervisor
# Boot cloud-hypervisor VM with the downloaded image
./cloud-hypervisor -v --kernel $HOME/workloads/vmlinux --disk path=clear-30970-kvm.img --cmdline "console=ttyS0 console=hvc0 reboot=k panic=1 nomodules root=/dev/vda3" --cpus 1 --memory size=1G --net tap=,mac=
./cloud-hypervisor -v --kernel $HOME/workloads/vmlinux --disk path=clear-${IMG_VERSION}-kvm.img --cmdline "console=ttyS0 console=hvc0 reboot=k panic=1 nomodules root=/dev/vda3 rw" --cpus 1 --memory size=4G --net tap=,mac=
# Setup connectivity
# First make sure to enable IP forwarding (disabled on Linux by default)
sudo bash -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
# Retrieve the interface name and the gateway IP
IFACE=$(ip route | grep default | awk -F 'dev' '{print $2}' | awk -F ' ' '{print $1}')
GW=$(ip route | grep vmtap0 | awk -F ' ' '{print $1}')
# Create a new masquerade rule to tag the packets going out
sudo iptables -t nat -A POSTROUTING -s ${GW} -o ${IFACE} -j MASQUERADE
```
@ -37,6 +45,7 @@ sudo swupd bundle-add os-installer
wget https://download.clearlinux.org/current/config/image/cloudguest.yaml
sed -i '/size: \"864M\"/d' cloudguest.yaml
sed -i 's/\"800M\"/\"2G\"/g' cloudguest.yaml
sed -i 's/bootloader,/bootloader,\n iperf,/g' cloudguest.yaml
sed -i 's/systemd-networkd-autostart/sysadmin-basic,\n systemd-networkd-autostart/g' cloudguest.yaml
# Create the custom cloudguest image
clr-installer -c cloudguest.yaml
@ -81,7 +90,7 @@ Proceed as follow to determine this UUID:
# Mount the image
sudo mount -o loop,offset=$((2048 * 512)) clear-cloudguest-raw.img /mnt/
# Identify UUID
cat mount_dir/loader/entries/Clear-linux-kvm-*.conf | grep "root=PARTUUID="
sudo cat /mnt/loader/entries/Clear-linux-kvm-*.conf | grep "root=PARTUUID="
# Unmount the image
sudo umount /mnt
```