[ovs-dev] [PATCH] rhel: make openvswitch service start return when ready

Alan Pevec alan.pevec at redhat.com
Sat Feb 11 00:03:19 UTC 2017

In OVS 2.6 openvswitch systemd service was changed to use BindsTo
instead of Requires for sub-services but also removed them from After

This made main openvswitch service return before sub-services were ready
breaking scripts which assumed everything is ready after systemctl start
e.g. in OpenStack CI infra [1] is calling ovs-vsctl immediately after
service start exposing a race in virtualized CI environment:
2017-02-09T23:11:12.498Z|00007|bridge|INFO|ovs-vswitchd (Open vSwitch) 2.6.1
but ovs-ctl tried to access it few msec too early:
2017-02-09 23:11:12.352493 | ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)

Solution is to add ordering dependencies, BindsTo/Requires do not ensure it [2]

Fixes: 84ad120 ("rhel: Improved Systemd Integration")

[1] https://github.com/openstack-infra/devstack-gate/blob/c435a724bd257b22a2e39e8e9125c11302a8c81d/functions.sh#L1057-L1078

[2] https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requires=

Signed-off-by: Alan Pevec <alan.pevec at redhat.com>
Reviewed-by: Aaron Conole <aconole at redhat.com>
 rhel/usr_lib_systemd_system_openvswitch.service | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rhel/usr_lib_systemd_system_openvswitch.service b/rhel/usr_lib_systemd_system_openvswitch.service
index e823c54..bdbceae 100644
--- a/rhel/usr_lib_systemd_system_openvswitch.service
+++ b/rhel/usr_lib_systemd_system_openvswitch.service
@@ -1,7 +1,7 @@
 Description=Open vSwitch
 Before=network.target network.service
+After=network-pre.target ovsdb-server.service ovs-vswitchd.service

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