func (h *NodeHealer) tryHealingNode(node provision.Node, reason string, lastCheck *NodeChecks) error {
_, hasIaas := node.Metadata()["iaas"]
if !hasIaas {
log.Debugf("node %q doesn't have IaaS information, healing (%s) won't run on it.", node.Address(), reason)
return nil
}
poolName := node.Metadata()[poolMetadataName]
evt, err := event.NewInternal(&event.Opts{
Target: event.Target{Type: event.TargetTypeNode, Value: node.Address()},
InternalKind: "healer",
CustomData: NodeHealerCustomData{
Node: provision.NodeToSpec(node),
Reason: reason,
LastCheck: lastCheck,
},
Allowed: event.Allowed(permission.PermPoolReadEvents, permission.Context(permission.CtxPool, poolName)),
})
if err != nil {
if _, ok := err.(event.ErrEventLocked); ok {
// Healing in progress.
return nil
}
return errors.Wrap(err, "Error trying to insert node healing event, healing aborted")
}
var createdNode *provision.NodeSpec
var evtErr error
defer func() {
var updateErr error
if evtErr == nil && createdNode == nil {
updateErr = evt.Abort()
} else {
updateErr = evt.DoneCustomData(evtErr, createdNode)
}
if updateErr != nil {
log.Errorf("error trying to update healing event: %s", updateErr)
}
}()
_, err = node.Provisioner().GetNode(node.Address())
if err != nil {
if err == provision.ErrNodeNotFound {
return nil
}
evtErr = errors.Wrap(err, "unable to check if node still exists")
return evtErr
}
shouldHeal, err := h.shouldHealNode(node)
if err != nil {
evtErr = errors.Wrap(err, "unable to check if node should be healed")
return evtErr
}
if !shouldHeal {
return nil
}
log.Errorf("initiating healing process for node %q due to: %s", node.Address(), reason)
createdNode, evtErr = h.healNode(node)
return evtErr
}
func (h *NodeHealer) healNode(node provision.Node) (*provision.NodeSpec, error) {
failingAddr := node.Address()
// Copy metadata to ensure underlying data structure is not modified.
newNodeMetadata := map[string]string{}
for k, v := range node.Metadata() {
newNodeMetadata[k] = v
}
failingHost := net.URLToHost(failingAddr)
healthNode, isHealthNode := node.(provision.NodeHealthChecker)
failures := 0
if isHealthNode {
failures = healthNode.FailureCount()
}
machine, err := iaas.CreateMachineForIaaS(newNodeMetadata["iaas"], newNodeMetadata)
if err != nil {
if isHealthNode {
healthNode.ResetFailures()
}
return nil, errors.Wrapf(err, "Can't auto-heal after %d failures for node %s: error creating new machine", failures, failingHost)
}
err = node.Provisioner().UpdateNode(provision.UpdateNodeOptions{
Address: failingAddr,
Disable: true,
})
if err != nil {
machine.Destroy()
return nil, errors.Wrapf(err, "Can't auto-heal after %d failures for node %s: error unregistering old node", failures, failingHost)
}
newAddr := machine.FormatNodeAddress()
log.Debugf("New machine created during healing process: %s - Waiting for docker to start...", newAddr)
createOpts := provision.AddNodeOptions{
Address: newAddr,
Metadata: newNodeMetadata,
WaitTO: h.waitTimeNewMachine,
CaCert: machine.CaCert,
ClientCert: machine.ClientCert,
ClientKey: machine.ClientKey,
}
err = node.Provisioner().AddNode(createOpts)
if err != nil {
if isHealthNode {
healthNode.ResetFailures()
}
node.Provisioner().UpdateNode(provision.UpdateNodeOptions{Address: failingAddr, Enable: true})
machine.Destroy()
return nil, errors.Wrapf(err, "Can't auto-heal after %d failures for node %s: error registering new node", failures, failingHost)
}
nodeSpec := provision.NodeToSpec(node)
nodeSpec.Address = newAddr
nodeSpec.Metadata = newNodeMetadata
var buf bytes.Buffer
err = node.Provisioner().RemoveNode(provision.RemoveNodeOptions{
Address: failingAddr,
Rebalance: true,
Writer: &buf,
})
if err != nil {
log.Errorf("Unable to move containers, skipping containers healing %q -> %q: %s: %s", failingHost, machine.Address, err, buf.String())
}
failingMachine, err := iaas.FindMachineByIdOrAddress(node.Metadata()["iaas-id"], failingHost)
if err != nil {
return &nodeSpec, errors.Wrapf(err, "Unable to find failing machine %s in IaaS", failingHost)
}
err = failingMachine.Destroy()
if err != nil {
return &nodeSpec, errors.Wrapf(err, "Unable to destroy machine %s from IaaS", failingHost)
}
log.Debugf("Done auto-healing node %q, node %q created in its place.", failingHost, machine.Address)
return &nodeSpec, nil
}