Proposal patch
** Also affects: linux (Ubuntu Bionic)
Importance: Medium
Status: Triaged
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Patch added: "UBUNTU-Debian-hyper-v-Ensure-that-hv-kvp-daemon.serv.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1739107/+attachment/5025785/+files/0001-UBUNTU-Debian-hyper-v-Ensure-that-hv-kvp-daemon.serv.patch
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https://bugs.launchpad.net/bugs/1739107
Title:
linux-cloud-tools-common: Ensure hv-kvp-daemon.service starts before
walinuxagent.service
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
New
Status in linux source package in Zesty:
New
Status in linux source package in Artful:
New
Status in linux source package in Bionic:
Triaged
Bug description:
This is a request to make a change in the hv-kvp-daemon systemd
service which is part of the linux-cloud-tools-common package to
ensure the hv-kvp-daemon service starts before the walinuxagent
service. The default dependencies make hv-kvp-daemon wait until the
whole system is up before it can start.
Currently the /lib/systemd/system/hv-kvp-daemon.service file looks
like this:
====================
# On Azure/Hyper-V systems start the hv_kvp_daemon
#
# author "Andy Whitcroft <[email protected]>"
[Unit]
Description=Hyper-V KVP Protocol Daemon
ConditionVirtualization=microsoft
[Service]
ExecStart=/usr/sbin/hv_kvp_daemon -n
[Install]
WantedBy=multi-user.target
====================
The suggested modification is to make the [Unit] section look like
this:
[Unit]
Description=Hyper-V KVP Protocol Daemon
ConditionVirtualization=microsoft
DefaultDependencies=no
After=systemd-remount-fs.service
Before=shutdown.target cloud-init-local.service walinuxagent.service
Conflicts=shutdown.target
RequiresMountsFor=/var/lib/hyperv
The hv-kvp-daemon service is not currently part of the critical-chain:
$ systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@"
character.
The time the unit takes to start is printed after the "+" character.
graphical.target @10.809s
└─multi-user.target @10.723s
└─ephemeral-disk-warning.service @10.538s +31ms
└─cloud-config.service @8.249s +2.252s
└─basic.target @8.044s
└─sockets.target @8.019s
└─snapd.socket @7.692s +264ms
└─sysinit.target @6.719s
└─cloud-init.service @5.803s +842ms
└─networking.service @5.137s +612ms
└─network-pre.target @5.074s
└─cloud-init-local.service @2.257s +2.783s
└─systemd-remount-fs.service @1.368s +656ms
└─systemd-journald.socket @1.218s
└─-.mount @649ms
└─system.slice @653ms
└─-.slice @649ms
In an Azure VM, the current startup time of my test is:
$ systemd-analyze
Startup finished in 10.375s (kernel) + 12.352s (userspace) = 22.728s
After making the suggested change, the startup time is similar:
$ systemd-analyze
Startup finished in 9.759s (kernel) + 11.867s (userspace) = 21.627s
And the service is now in the critical-chain:
$ systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@"
character.
The time the unit takes to start is printed after the "+" character.
graphical.target @10.666s
└─multi-user.target @10.636s
└─ephemeral-disk-warning.service @10.556s +36ms
└─cloud-config.service @8.423s +2.095s
└─basic.target @8.124s
└─sockets.target @8.101s
└─lxd.socket @7.677s +326ms
└─sysinit.target @6.755s
└─cloud-init.service @5.814s +908ms
└─networking.service @5.111s +651ms
└─network-pre.target @5.087s
└─cloud-init-local.service @2.345s +2.707s
└─hv-kvp-daemon.service @2.316s
└─systemd-remount-fs.service @1.253s +680ms
└─system.slice @1.225s
└─-.slice @650ms
The ConditionVirtualization=microsoft line makes it so that this
doesn't affect non microsoft virtualization environments (ie. qemu,
kvm, vmware, xen, etc.)
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