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kubernetes.go
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kubernetes.go
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package drainmanager
import (
"errors"
"fmt"
"os"
"os/exec"
"go.uber.org/zap"
"go.uber.org/zap/zapio"
"github.com/webdevops/azure-scheduledevents-manager/azuremetadata"
"github.com/webdevops/azure-scheduledevents-manager/config"
)
type DrainManagerKubernetes struct {
DrainManager
Conf config.Opts
Logger *zap.SugaredLogger
nodeName string
}
func (m *DrainManagerKubernetes) SetInstanceName(name string) {
m.nodeName = name
}
func (m *DrainManagerKubernetes) InstanceName() string {
return m.nodeName
}
func (m *DrainManagerKubernetes) Test() error {
if !m.execGet("node", m.nodeName) {
return errors.New(`unable to get node from kubernetes api`)
}
return nil
}
func (m *DrainManagerKubernetes) Drain(event *azuremetadata.AzureScheduledEvent) bool {
// Label
m.Logger.Infof(fmt.Sprintf("label node %v", m.nodeName))
if !m.exec("label", "node", m.nodeName, "--overwrite=true", fmt.Sprintf("webdevops.io/azure-scheduledevents-manager=%v", m.nodeName)) {
return false
}
// DRAIN
m.Logger.Infof(fmt.Sprintf("drain node %v", m.nodeName))
kubectlDrainOpts := []string{"drain", m.nodeName}
kubectlDrainOpts = append(kubectlDrainOpts, m.Conf.Kubernetes.Drain.Args...)
return m.exec(kubectlDrainOpts...)
}
func (m *DrainManagerKubernetes) Uncordon() bool {
m.Logger.Infof(fmt.Sprintf("uncordon node %v", m.nodeName))
if !m.exec("uncordon", "-l", fmt.Sprintf("webdevops.io/azure-scheduledevents-manager=%v", m.nodeName)) {
return false
}
m.Logger.Infof(fmt.Sprintf("remove label node %v", m.nodeName))
return m.exec("label", "node", m.nodeName, "--overwrite=true", "webdevops.io/azure-scheduledevents-manager-")
}
func (m *DrainManagerKubernetes) execGet(resourceType string, args ...string) bool {
kubectlArgs := []string{
"get",
"--no-headers=true",
resourceType,
}
kubectlArgs = append(kubectlArgs, args...)
return m.runComand(exec.Command("kubectl", kubectlArgs...)) // #nosec G204
}
func (m *DrainManagerKubernetes) exec(args ...string) bool {
if m.Conf.Kubernetes.Drain.DryRun {
args = append(args, "--dry-run")
}
return m.runComand(exec.Command("/kubectl", args...))
}
func (m *DrainManagerKubernetes) runComand(cmd *exec.Cmd) bool {
cmd.Env = os.Environ()
cmdLogger := m.Logger.With(zap.String("command", "kubectl")).Desugar()
cmdLogger = cmdLogger.WithOptions(zap.AddStacktrace(zap.PanicLevel), zap.WithCaller(false))
m.Logger.Debugf("EXEC: %v", cmd.String())
stdOutWriter := &zapio.Writer{Log: cmdLogger, Level: zap.InfoLevel}
defer stdOutWriter.Close()
stdErrWriter := &zapio.Writer{Log: cmdLogger, Level: zap.ErrorLevel}
defer stdErrWriter.Close()
cmd.Stdout = stdOutWriter
cmd.Stderr = stdErrWriter
err := cmd.Run()
if err != nil {
cmdLogger.Error(err.Error())
return false
}
return true
}