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Using LAVA V2 for advanced KVM testing
Riku Voipio <riku.voipio@linaro.org>
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Background
● LAVA supports KVM testing using vmgroups feature
● Easy to use, but rather restricted
○ Hardcoded qemu command line
○ Can’t use for xen/libvirt/kvmtool for virtualization testing
○ Images need to be tailored for testing
● LAVA V2, aka pipeline to rescue
○ Explicit control of everything
○ After some bugs fixing, finally there!
● LAVA v2 Training session LAS16-TR05 wednesday 3pm
ENGINEERS
AND DEVICES
WORKING
TOGETHER
● Test that armv8 host boots an armv7 guest
● http://people.linaro.org/~riku.voipio/kvm-pipeline.yaml
● Interesting sections
○ Deploy: host
■ The kernel and nfsroot to use for test
○ Boot: host
■ Boot host using u-boot and wait for prompt
○ Boot: guest
■ Wait for guest IP to connect via SSH
○ Test: host
■ Start kvm guest with lava-test-shell definition
■ Send lava the IP of guest once guest is up
○ Test: guest
■ The tests run on guest
Basic pipeline KVM test
LAS16-211: Using LAVA V2 for advanced KVM testing
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Guest deployment steps
1. Download Guest OS using parameters
○ OS, UEFI firmware, possibly kernel
2. Configure Guest OS
○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/common/scrip
ts/kvm-cloud/cloudinit.txt
○ Install SSH keys for LAVA to log in
○ Phone home when boot is finished
3. Start QEMU
○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/common/scrip
ts/kvm-cloud/start-kvm.sh#l105
○ Uses daemonize option and saves boot log to file
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Download guest OS
● Any cloud image is good to go
○ Defined in job template
parameters:
GUEST_ARCH: armv7l
GUEST_IMAGE:
https://cloud-images.ubuntu.com/.../xenial-server-cloudimg-
armhf-disk1.img
GUEST_KERNEL:
https://cloud-images.ubuntu.com/.../xenial-server-cloudimg-
armhf-vmlinuz-lpae
ENGINEERS AND DEVICES
WORKING TOGETHER
Configure guest OS
● Supports any linux image with
cloud-init support
● https://cloudinit.readthedocs.io/en/
latest/
● Ubuntu, Debian, Fedora, CentOS
tested
#cloud-config
users:
- name: linaro
ssh-authorized-keys:
- LAVA_KEY
sudo: ['ALL=(ALL) NOPASSWD:ALL']
groups: sudo
shell: /bin/bash
runcmd:
- cp /home/linaro/.ssh/authorized_keys
/root/.ssh/authorized_keys
- chown root:root /root/.ssh/authorized_keys
phone_home:
url: http://LOCALIP:8080/
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Start Qemu
● Start-kvm.yaml
○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/ubuntu/start-k
vm.yaml
○ Install and start qemu
○ Wait for guest start and signal lava with IP
● Stop-guest.yaml
○ Signal shutdown of guest
● Against the LAVA documentation advice to inline
lava-send calls
○ See the link for the rationale:
https://validation.linaro.org/static/docs/v2/writing-multinode.html#co
ntrolling-synchronisation-from-the-test-shell
ENGINEERS AND DEVICES
WORKING TOGETHER
Bits from Multinode protocol
● Guest deploy uses lava-wait to
stand-by until read
● Host will send the IP using
lava-send
● The messages obviously need to
match
● https://validation.linaro.org/static/d
ocs/v2/writing-multinode.html
- deploy:
role:
- guest
connection: ssh
os: ubuntu
protocols:
lava-multinode:
- action: prepare-scp-overlay
request: lava-wait
messageID: ipv4
message:
ipaddr: $ipaddr
ENGINEERS AND DEVICES
WORKING TOGETHER
Viewing Results
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Tips and bits for LAVA V2
● Use unique values for each timeout
○ Helps you find out which timeout triggered!
● Use inline test-definitions while developing
● Keep lava-dispatcher codebase available...
● Try and find out!
ENGINEERS
AND DEVICES
WORKING
TOGETHER
Future directions
● Replicate this with Xen, libvirt, kvmtool
● Web frontend for results
● Selecting what tests to run
○ Previously we used only hackbench
○ With the pipeline job structure, we can choose any of the existing QA
tests
● Migration tests (more than 1 node)
● Support cloud images / cloud-init with LAVA directly?
Thank You
#LAS16
For further information: www.linaro.org
LAS16 keynotes and videos on: connect.linaro.org
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LAS16-211: Using LAVA V2 for advanced KVM testing

  • 1. Using LAVA V2 for advanced KVM testing Riku Voipio <[email protected]>
  • 2. ENGINEERS AND DEVICES WORKING TOGETHER Background ● LAVA supports KVM testing using vmgroups feature ● Easy to use, but rather restricted ○ Hardcoded qemu command line ○ Can’t use for xen/libvirt/kvmtool for virtualization testing ○ Images need to be tailored for testing ● LAVA V2, aka pipeline to rescue ○ Explicit control of everything ○ After some bugs fixing, finally there! ● LAVA v2 Training session LAS16-TR05 wednesday 3pm
  • 3. ENGINEERS AND DEVICES WORKING TOGETHER ● Test that armv8 host boots an armv7 guest ● http://people.linaro.org/~riku.voipio/kvm-pipeline.yaml ● Interesting sections ○ Deploy: host ■ The kernel and nfsroot to use for test ○ Boot: host ■ Boot host using u-boot and wait for prompt ○ Boot: guest ■ Wait for guest IP to connect via SSH ○ Test: host ■ Start kvm guest with lava-test-shell definition ■ Send lava the IP of guest once guest is up ○ Test: guest ■ The tests run on guest Basic pipeline KVM test
  • 5. ENGINEERS AND DEVICES WORKING TOGETHER Guest deployment steps 1. Download Guest OS using parameters ○ OS, UEFI firmware, possibly kernel 2. Configure Guest OS ○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/common/scrip ts/kvm-cloud/cloudinit.txt ○ Install SSH keys for LAVA to log in ○ Phone home when boot is finished 3. Start QEMU ○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/common/scrip ts/kvm-cloud/start-kvm.sh#l105 ○ Uses daemonize option and saves boot log to file
  • 6. ENGINEERS AND DEVICES WORKING TOGETHER Download guest OS ● Any cloud image is good to go ○ Defined in job template parameters: GUEST_ARCH: armv7l GUEST_IMAGE: https://cloud-images.ubuntu.com/.../xenial-server-cloudimg- armhf-disk1.img GUEST_KERNEL: https://cloud-images.ubuntu.com/.../xenial-server-cloudimg- armhf-vmlinuz-lpae
  • 7. ENGINEERS AND DEVICES WORKING TOGETHER Configure guest OS ● Supports any linux image with cloud-init support ● https://cloudinit.readthedocs.io/en/ latest/ ● Ubuntu, Debian, Fedora, CentOS tested #cloud-config users: - name: linaro ssh-authorized-keys: - LAVA_KEY sudo: ['ALL=(ALL) NOPASSWD:ALL'] groups: sudo shell: /bin/bash runcmd: - cp /home/linaro/.ssh/authorized_keys /root/.ssh/authorized_keys - chown root:root /root/.ssh/authorized_keys phone_home: url: http://LOCALIP:8080/
  • 8. ENGINEERS AND DEVICES WORKING TOGETHER Start Qemu ● Start-kvm.yaml ○ https://git.linaro.org/qa/test-definitions.git/blob/HEAD:/ubuntu/start-k vm.yaml ○ Install and start qemu ○ Wait for guest start and signal lava with IP ● Stop-guest.yaml ○ Signal shutdown of guest ● Against the LAVA documentation advice to inline lava-send calls ○ See the link for the rationale: https://validation.linaro.org/static/docs/v2/writing-multinode.html#co ntrolling-synchronisation-from-the-test-shell
  • 9. ENGINEERS AND DEVICES WORKING TOGETHER Bits from Multinode protocol ● Guest deploy uses lava-wait to stand-by until read ● Host will send the IP using lava-send ● The messages obviously need to match ● https://validation.linaro.org/static/d ocs/v2/writing-multinode.html - deploy: role: - guest connection: ssh os: ubuntu protocols: lava-multinode: - action: prepare-scp-overlay request: lava-wait messageID: ipv4 message: ipaddr: $ipaddr
  • 10. ENGINEERS AND DEVICES WORKING TOGETHER Viewing Results
  • 11. ENGINEERS AND DEVICES WORKING TOGETHER Tips and bits for LAVA V2 ● Use unique values for each timeout ○ Helps you find out which timeout triggered! ● Use inline test-definitions while developing ● Keep lava-dispatcher codebase available... ● Try and find out!
  • 12. ENGINEERS AND DEVICES WORKING TOGETHER Future directions ● Replicate this with Xen, libvirt, kvmtool ● Web frontend for results ● Selecting what tests to run ○ Previously we used only hackbench ○ With the pipeline job structure, we can choose any of the existing QA tests ● Migration tests (more than 1 node) ● Support cloud images / cloud-init with LAVA directly?
  • 13. Thank You #LAS16 For further information: www.linaro.org LAS16 keynotes and videos on: connect.linaro.org