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k8s.go
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k8s.go
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//go:build !debug
// +build !debug
/*
* Copyright 2018-2023, CS Systemes d'Information, http://csgroup.eu
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package k8s
import (
"context"
"fmt"
"strconv"
"strings"
"github.com/CS-SI/SafeScale/v22/lib/utils/data"
"github.com/sirupsen/logrus"
"github.com/CS-SI/SafeScale/v22/lib/backend/resources"
"github.com/CS-SI/SafeScale/v22/lib/backend/resources/abstract"
"github.com/CS-SI/SafeScale/v22/lib/backend/resources/enums/clustercomplexity"
"github.com/CS-SI/SafeScale/v22/lib/backend/resources/operations/clusterflavors"
"github.com/CS-SI/SafeScale/v22/lib/backend/resources/operations/consts"
"github.com/CS-SI/SafeScale/v22/lib/utils/cli/enums/outputs"
"github.com/CS-SI/SafeScale/v22/lib/utils/fail"
)
var (
// Makers initializes a control.Makers struct to construct a BOH Cluster
Makers = clusterflavors.Makers{
MinimumRequiredServers: minimumRequiredServers,
DefaultGatewaySizing: gatewaySizing,
DefaultMasterSizing: nodeSizing,
DefaultNodeSizing: nodeSizing,
DefaultImage: defaultImage,
ConfigureCluster: configureCluster,
LeaveNodeFromCluster: leaveNodeFromCluster,
}
)
func minimumRequiredServers(ctx context.Context, clusterIdentity abstract.ClusterIdentity) (uint, uint, uint, fail.Error) {
var masterCount uint
var privateNodeCount uint
var publicNodeCount uint
switch clusterIdentity.Complexity {
case clustercomplexity.Small:
masterCount = 1
privateNodeCount = 1
case clustercomplexity.Normal:
masterCount = 3
privateNodeCount = 3
case clustercomplexity.Large:
masterCount = 5
privateNodeCount = 6
}
return masterCount, privateNodeCount, publicNodeCount, nil
}
func gatewaySizing(ctx context.Context, _ resources.Cluster) abstract.HostSizingRequirements {
return abstract.HostSizingRequirements{
MinCores: 2,
MaxCores: 4,
MinRAMSize: 7.0,
MaxRAMSize: 16.0,
MinDiskSize: 50,
MinGPU: -1,
}
}
func nodeSizing(ctx context.Context, _ resources.Cluster) abstract.HostSizingRequirements {
return abstract.HostSizingRequirements{
MinCores: 4,
MaxCores: 8,
MinRAMSize: 15.0,
MaxRAMSize: 32.0,
MinDiskSize: 80,
MinGPU: -1,
}
}
func defaultImage(ctx context.Context, _ resources.Cluster) string {
return consts.DEFAULTOS
}
func kubernetesIsRunning(ctx context.Context, c resources.Cluster, params data.Map) fail.Error {
if c == nil {
return fail.InvalidParameterCannotBeNilError("clusterInstance")
}
sm, xerr := c.FindAvailableMaster(ctx)
if xerr != nil {
return xerr
}
// sudo -u cladm kubectl get nodes | tail -n +2 | wc -l
cmd := fmt.Sprintf("sudo -u cladm kubectl get nodes | tail -n +2 | wc -l")
timings, xerr := c.Service().Timings()
if xerr != nil {
return xerr
}
retcode, stdout, stderr, xerr := sm.Run(ctx, cmd, outputs.COLLECT, timings.ConnectionTimeout(), timings.ExecutionTimeout())
if xerr != nil {
return fail.Wrap(xerr, "failed to get number of nodes '%s'", c.GetName())
}
switch retcode {
case 0:
break
default:
xerr := fail.ExecutionError(nil, "failed to get number of nodes '%s'", c.GetName())
xerr.Annotate("retcode", retcode)
xerr.Annotate("stdout", stdout)
xerr.Annotate("stderr", stderr)
return xerr
}
first := stdout
// sudo -u cladm kubectl get nodes | tail -n +2 | wc -l
cmd = fmt.Sprintf("sudo -u cladm kubectl get nodes | tail -n +2 | grep Ready | wc -l")
timings, xerr = c.Service().Timings()
if xerr != nil {
return xerr
}
retcode, stdout, stderr, xerr = sm.Run(ctx, cmd, outputs.COLLECT, timings.ConnectionTimeout(), timings.ExecutionTimeout())
if xerr != nil {
return fail.Wrap(xerr, "failed to get number of nodes '%s'", c.GetName())
}
switch retcode {
case 0:
break
default:
xerr := fail.ExecutionError(nil, "failed to get number of nodes '%s'", c.GetName())
xerr.Annotate("retcode", retcode)
xerr.Annotate("stdout", stdout)
xerr.Annotate("stderr", stderr)
return xerr
}
second := stdout
if first != second {
return fail.NewError("not all k8s nodes are Ready")
}
lm, xerr := c.ListMasters(ctx)
if xerr != nil {
return xerr
}
ln, xerr := c.ListNodes(ctx)
if xerr != nil {
return xerr
}
numMachines := len(lm) + len(ln)
bar := strings.Trim(first, "\n")
bar = strings.Trim(bar, " ")
running, err := strconv.Atoi(bar)
if err != nil {
return fail.ConvertError(err)
}
if running <= numMachines {
return fail.NewError("not all k8s nodes are Ready")
}
return nil
}
func configureCluster(ctx context.Context, c resources.Cluster, params data.Map, b bool) fail.Error {
clusterName := c.GetName()
logrus.Println(fmt.Sprintf("[cluster %s] adding feature 'kubernetes'...", clusterName))
results, xerr := c.AddFeature(ctx, "kubernetes", params, resources.FeatureSettings{
AddUnconditionally: b,
})
if xerr != nil {
return fail.Wrap(xerr, "[cluster %s] failed to add feature 'kubernetes'", clusterName)
}
if !results.Successful() {
xerr = fail.NewError(fmt.Errorf(results.AllErrorMessages()), nil, "failed to add feature 'kubernetes' to cluster '%s'", clusterName)
logrus.WithContext(ctx).Errorf("[cluster %s] failed to add feature 'kubernetes': %s", clusterName, xerr.Error())
return xerr
}
results, xerr = c.AddFeature(ctx, "helm3", params, resources.FeatureSettings{
AddUnconditionally: b,
})
if xerr != nil {
return fail.Wrap(xerr, "[cluster %s] failed to add feature 'helm3'", clusterName)
}
if !results.Successful() {
xerr = fail.NewError(fmt.Errorf(results.AllErrorMessages()), nil, "failed to add feature 'helm3' to cluster '%s'", clusterName)
logrus.WithContext(ctx).Errorf("[cluster %s] failed to add feature 'helm3': %s", clusterName, xerr.Error())
return xerr
}
xerr = kubernetesIsRunning(ctx, c, params)
if xerr != nil {
return fail.Wrap(xerr, "[cluster %s] failed to verify all nodes are running", clusterName)
}
logrus.WithContext(ctx).Infof("[cluster %s] feature 'kubernetes' addition successful.", clusterName)
return nil
}
// This function is called to remove a node from a Cluster
func leaveNodeFromCluster(
ctx context.Context, clusterInstance resources.Cluster, node resources.Host, selectedMaster resources.Host,
) (ferr fail.Error) {
if clusterInstance == nil {
return fail.InvalidParameterCannotBeNilError("clusterInstance")
}
if node == nil {
return fail.InvalidParameterCannotBeNilError("node")
}
if selectedMaster == nil {
var xerr fail.Error
selectedMaster, xerr = clusterInstance.FindAvailableMaster(ctx)
if xerr != nil {
return xerr
}
}
// Drain pods from node
// cmd := fmt.Sprintf("sudo -u cladm -i kubectl drain %s --ignore-daemonsets --delete-emptydir-data", node.GetName())
cmd := fmt.Sprintf("sudo -u cladm -i kubectl drain %s --ignore-daemonsets", node.GetName())
timings, xerr := clusterInstance.Service().Timings()
if xerr != nil {
return xerr
}
retcode, stdout, stderr, xerr := selectedMaster.Run(ctx, cmd, outputs.COLLECT, timings.ConnectionTimeout(), timings.ExecutionTimeout())
if xerr != nil {
return fail.Wrap(xerr, "failed to execute pod drain from node '%s'", node.GetName())
}
switch retcode {
case 0:
break
case 1:
if strings.Contains(stderr, "(NotFound)") {
break
}
fallthrough
default:
xerr := fail.ExecutionError(nil, "failed to drain pods from node '%s'", node.GetName())
xerr.Annotate("retcode", retcode)
xerr.Annotate("stdout", stdout)
xerr.Annotate("stderr", stderr)
return xerr
}
// delete node from Kubernetes
cmd = fmt.Sprintf("sudo -u cladm -i kubectl delete node %s", node.GetName())
retcode, stdout, stderr, xerr = selectedMaster.Run(ctx, cmd, outputs.COLLECT, timings.ConnectionTimeout(), timings.ExecutionTimeout())
if xerr != nil {
return fail.Wrap(xerr, "failed to execute node deletion '%s' from cluster '%s'", node.GetName(), clusterInstance.GetName())
}
switch retcode {
case 0:
break
case 1:
if strings.Contains(stderr, "(NotFound)") {
break
}
fallthrough
default:
xerr := fail.ExecutionError(nil, "failed to delete node '%s' from cluster '%s'", node.GetName(), clusterInstance.GetName())
xerr.Annotate("retcode", retcode)
xerr.Annotate("stdout", stdout)
xerr.Annotate("stderr", stderr)
return xerr
}
// Finally, reset kubernetes configuration of node
retcode, stdout, stderr, xerr = node.Run(ctx, "sudo kubeadm reset -f", outputs.COLLECT, timings.ConnectionTimeout(), timings.ExecutionTimeout())
if xerr != nil {
return fail.Wrap(xerr, "failed to execute reset of kubernetes configuration on Host '%s'", node.GetName())
}
switch retcode {
case 0:
break
case 1:
if strings.Contains(stderr, "command not found") {
break
}
fallthrough
default:
xerr := fail.ExecutionError(nil, "failed to reset kubernetes configuration on Host '%s'", node.GetName())
xerr.Annotate("retcode", retcode)
xerr.Annotate("stdout", stdout)
xerr.Annotate("stderr", stderr)
return xerr
}
return nil
}