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Retry creating dynamic networks if not found

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In cases there are failures in task start, swarmkit might be trying to
restart the task again in the same node which might keep failing. This
creates a race where when a failed task is getting removed it might
remove the associated network while another task for the same service
or a different service but connected to the same network is proceeding
with starting the container knowing that the network is still
present. Fix this by reacting to `ErrNoSuchNetwork` error during
container start by trying to recreate the managed networks. If they
have been removed it will be recreated. If they are already present
nothing bad will happen.

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
This commit is contained in:
Jana Radhakrishnan 2016-08-09 13:37:11 -07:00
parent eb28dde01f
commit 117cef5e97
1 changed files with 18 additions and 2 deletions
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20
daemon/cluster/executor/container/controller.go
View file

@ -7,6 +7,7 @@ import (
executorpkg "github.com/docker/docker/daemon/cluster/executor"
"github.com/docker/engine-api/types"
"github.com/docker/engine-api/types/events"
"github.com/docker/libnetwork"
"github.com/docker/swarmkit/agent/exec"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/log"
@ -163,8 +164,23 @@ func (r *controller) Start(ctx context.Context) error {
return exec.ErrTaskStarted
}
if err := r.adapter.start(ctx); err != nil {
return errors.Wrap(err, "starting container failed")
for {
if err := r.adapter.start(ctx); err != nil {
if _, ok := err.(libnetwork.ErrNoSuchNetwork); ok {
// Retry network creation again if we
// failed because some of the networks
// were not found.
if err := r.adapter.createNetworks(ctx); err != nil {
return err
}
continue
}
return errors.Wrap(err, "starting container failed")
}
break
}
// no health check