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upgrade.go
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upgrade.go
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package kubernetes
import (
"fmt"
"github.com/pkg/errors"
v1 "k8s.io/api/core/v1"
"github.com/caos/orbos/internal/operator/common"
"github.com/caos/orbos/mntr"
)
type initializedMachines []*initializedMachine
func (c initializedMachines) Len() int { return len(c) }
func (c initializedMachines) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c initializedMachines) Less(i, j int) bool { return c[i].infra.ID() < c[j].infra.ID() }
func ensureSoftware(
monitor mntr.Monitor,
target KubernetesVersion,
k8sClient *Client,
controlplane []*initializedMachine,
workers []*initializedMachine) (bool, error) {
sortedMachines := append(controlplane, workers...)
from, to, err := findPath(monitor, sortedMachines, target)
if err != nil {
return false, err
}
monitor.WithFields(map[string]interface{}{
"currentSoftware": from,
"currentKubernetes": from.Kubelet,
"desiredSofware": to,
"desiredKubernetes": to.Kubelet,
}).Debug("Ensuring kubernetes version")
return step(k8sClient, monitor, sortedMachines, to)
}
func findPath(
monitor mntr.Monitor,
machines []*initializedMachine,
target KubernetesVersion,
) (common.Software, common.Software, error) {
var overallLowKubelet KubernetesVersion
var overallLowKubeletMinor int
zeroSW := common.Software{}
for _, machine := range machines {
id := machine.infra.ID()
if machine.node == nil {
continue
}
nodeinfoKubelet := machine.node.Status.NodeInfo.KubeletVersion
monitor.WithFields(map[string]interface{}{
"machine": id,
"kubelet": nodeinfoKubelet,
}).Debug("Found kubelet version from node info")
kubelet := ParseString(nodeinfoKubelet)
if kubelet == Unknown {
return zeroSW, zeroSW, errors.Errorf("parsing version %s from nodes %s info failed", nodeinfoKubelet, id)
}
kubeletMinor, err := kubelet.ExtractMinor(monitor)
if err != nil {
return zeroSW, zeroSW, errors.Wrapf(err, "extracting minor from kubelet version %s from nodes %s info failed", nodeinfoKubelet, id)
}
if overallLowKubelet == Unknown {
overallLowKubelet = kubelet
overallLowKubeletMinor = kubeletMinor
continue
}
kubeletPatch, err := kubelet.ExtractPatch(monitor)
if err != nil {
return zeroSW, zeroSW, errors.Wrapf(err, "extracting patch from kubelet version %s from nodes %s info failed", nodeinfoKubelet, id)
}
tmpOverallLowKubeletMinor, err := overallLowKubelet.ExtractMinor(monitor)
if err != nil {
return zeroSW, zeroSW, errors.Wrapf(err, "extracting minor from overall kubelet version %s failed", overallLowKubelet)
}
tmpOverallLowKubeletPatch, err := overallLowKubelet.ExtractPatch(monitor)
if err != nil {
return zeroSW, zeroSW, errors.Wrapf(err, "extracting patch from overall kubelet version %s failed", overallLowKubelet)
}
if kubeletMinor < tmpOverallLowKubeletMinor ||
kubeletMinor == tmpOverallLowKubeletMinor && kubeletPatch < tmpOverallLowKubeletPatch {
overallLowKubelet = kubelet
overallLowKubeletMinor = kubeletMinor
}
}
if overallLowKubelet == target || overallLowKubelet == Unknown {
target := target.DefineSoftware()
monitor.WithFields(map[string]interface{}{
"from": overallLowKubelet,
"to": target,
}).Debug("Cluster is up to date")
return target, target, nil
}
targetMinor, err := target.ExtractMinor(monitor)
if err != nil {
return zeroSW, zeroSW, errors.Wrapf(err, "extracting minor from target version %s failed", target)
}
if targetMinor < overallLowKubeletMinor {
return zeroSW, zeroSW, errors.Errorf("downgrading from %s to %s is not possible as they are on different minors", overallLowKubelet, target)
}
overallLowKubeletSoftware := overallLowKubelet.DefineSoftware()
if (targetMinor - overallLowKubeletMinor) < 2 {
monitor.WithFields(map[string]interface{}{
"from": overallLowKubelet,
"to": target,
"targetMinor": targetMinor,
"overallLowKubeletMinor": overallLowKubeletMinor,
}).Debug("Desired version can be reached directly")
return overallLowKubeletSoftware, target.DefineSoftware(), nil
}
nextHighestMinor := overallLowKubelet.NextHighestMinor()
monitor.WithFields(map[string]interface{}{
"from": overallLowKubelet,
"fromMinor": overallLowKubeletMinor,
"intermediate": nextHighestMinor,
"to": target,
"toMinor": targetMinor,
}).Debug("Desired version can be reached via an intermediate version")
return overallLowKubeletSoftware, nextHighestMinor.DefineSoftware(), nil
}
func step(
k8sClient *Client,
monitor mntr.Monitor,
sortedMachines initializedMachines,
to common.Software,
) (bool, error) {
for _, machine := range sortedMachines {
if machine.node != nil && machine.node.Spec.Unschedulable && machine.node.Labels["orbos.ch/updating"] == machine.node.Status.NodeInfo.KubeletVersion {
delete(machine.node.Labels, "orbos.ch/updating")
if err := k8sClient.Uncordon(machine.currentMachine, machine.node); err != nil {
return false, err
}
}
}
for idx, machine := range sortedMachines {
next, err := plan(k8sClient, monitor, machine, idx == 0, to)
if err != nil {
return false, errors.Wrapf(err, "planning machine %s failed", machine.infra.ID())
}
if next == nil {
continue
}
return false, next()
}
return true, nil
}
func plan(
k8sClient *Client,
monitor mntr.Monitor,
machine *initializedMachine,
isFirstControlplane bool,
to common.Software,
) (func() error, error) {
id := machine.infra.ID()
machinemonitor := monitor.WithFields(map[string]interface{}{
"machine": id,
})
awaitNodeAgent := func() error {
machinemonitor.Info("Awaiting node agent")
return nil
}
ensureSoftware := func(k8sNode *v1.Node, isControlplane bool, isFirstControlplane bool) func() error {
return func() (err error) {
defer func() {
err = errors.Wrapf(err, "ensuring software on node %s failed", machine.infra.ID())
}()
if !isControlplane {
k8sNode.Labels["orbos.ch/updating"] = to.Kubelet.Version
if err := k8sClient.Drain(machine.currentMachine, k8sNode); err != nil {
return err
}
}
upgradeAction := "node"
if isFirstControlplane {
machinemonitor.Info("Migrating first controlplane node")
upgradeAction = fmt.Sprintf("apply %s --yes", to.Kubelet.Version)
} else {
machinemonitor.Info("Migrating node")
}
_, err = machine.infra.Execute(nil, fmt.Sprintf("sudo kubeadm upgrade %s", upgradeAction))
if err != nil {
return err
}
if !softwareContains(*machine.desiredNodeagent.Software, to) {
machine.desiredNodeagent.Software.Merge(to)
machinemonitor.WithFields(map[string]interface{}{
"from": machine.currentNodeagent.Software.Kubelet.Version,
"to": to.Kubelet.Version,
}).Changed("Updated Kubernetes packages desired")
}
return nil
}
}
ensureTargetSoftware := func() error {
if !softwareContains(*machine.desiredNodeagent.Software, to) {
machine.desiredNodeagent.Software.Merge(to)
machinemonitor.WithFields(map[string]interface{}{
"current": KubernetesSoftware(machine.currentNodeagent.Software),
"desired": to,
}).Changed("Target software desired")
} else {
machinemonitor.Info("Awaiting kubernetes software")
}
return nil
}
nodeIsReady := machine.currentNodeagent.NodeIsReady
if !machine.currentMachine.Joined {
if softwareContains(machine.currentNodeagent.Software, to) {
if !nodeIsReady {
return awaitNodeAgent, nil
}
// This node needs to be joined first
return nil, nil
}
return ensureTargetSoftware, nil
}
if machine.currentNodeagent.Software.Kubeadm.Version != to.Kubeadm.Version {
return func() error {
if machine.desiredNodeagent.Software.Kubeadm.Version != to.Kubeadm.Version {
machine.desiredNodeagent.Software.Kubeadm.Version = to.Kubeadm.Version
machinemonitor.WithFields(map[string]interface{}{
"current": machine.currentNodeagent.Software.Kubeadm.Version,
"desired": to.Kubeadm.Version,
}).Changed("Kubeadm desired")
}
return nil
}, nil
}
isControlplane := machine.pool.tier == Controlplane
if machine.node.Status.NodeInfo.KubeletVersion != to.Kubelet.Version {
return ensureSoftware(machine.node, isControlplane, isFirstControlplane), nil
}
if !softwareContains(machine.currentNodeagent.Software, to) || !softwareContains(*machine.desiredNodeagent.Software, to) {
return ensureTargetSoftware, nil
}
if !nodeIsReady {
return awaitNodeAgent, nil
}
return nil, nil
}