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/*
Copyright (c) 2017 VMware, Inc. All Rights Reserved.
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.
*/
/*
This example program shows how to collect performance metrics from virtual machines using govmomi.
*/
package main
import (
"context"
"flag"
"fmt"
"github.com/vmware/govmomi/examples"
"github.com/vmware/govmomi/performance"
"github.com/vmware/govmomi/view"
"github.com/vmware/govmomi/vim25"
"github.com/vmware/govmomi/vim25/types"
)
var interval = flag.Int("i", 20, "Interval ID")
func main() {
examples.Run(func(ctx context.Context, c *vim25.Client) error {
// Get virtual machines references
m := view.NewManager(c)
v, err := m.CreateContainerView(ctx, c.ServiceContent.RootFolder, nil, true)
if err != nil {
return err
}
defer v.Destroy(ctx)
vmsRefs, err := v.Find(ctx, []string{"VirtualMachine"}, nil)
if err != nil {
return err
}
// Create a PerfManager
perfManager := performance.NewManager(c)
// Retrieve counters name list
counters, err := perfManager.CounterInfoByName(ctx)
if err != nil {
return err
}
var names []string
for name := range counters {
names = append(names, name)
}
// Create PerfQuerySpec
spec := types.PerfQuerySpec{
MaxSample: 1,
MetricId: []types.PerfMetricId{{Instance: "*"}},
IntervalId: int32(*interval),
}
// Query metrics
sample, err := perfManager.SampleByName(ctx, spec, names, vmsRefs)
if err != nil {
return err
}
result, err := perfManager.ToMetricSeries(ctx, sample)
if err != nil {
return err
}
// Read result
for _, metric := range result {
name := metric.Entity
for _, v := range metric.Value {
counter := counters[v.Name]
units := counter.UnitInfo.GetElementDescription().Label
instance := v.Instance
if instance == "" {
instance = "-"
}
if len(v.Value) != 0 {
fmt.Printf("%s\t%s\t%s\t%s\t%s\n",
name, instance, v.Name, v.ValueCSV(), units)
}
}
}
return nil
})
}
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