Implements automatic ballooning

This commit is contained in:
Mikhail Klementev 2018-07-12 20:00:57 +00:00
parent 1184fa3d7e
commit 2dae4eb5a3
2 changed files with 70 additions and 0 deletions

View file

@ -66,6 +66,17 @@ Default hotkey to release cursor: ctrl+alt.
$ appvm stop chromium
## Automatic ballooning
Add this command:
$ appvm autoballoon
to crontab like that:
$ crontab -l
* * * * * /home/user/dev/go/bin/appvm autoballoon
# App description
$ cat nix/chromium.nix

View file

@ -16,11 +16,13 @@ import (
"os"
"os/exec"
"path/filepath"
"strconv"
"syscall"
"time"
"github.com/digitalocean/go-libvirt"
"github.com/jollheef/go-system"
"github.com/olekukonko/tablewriter"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
@ -239,6 +241,60 @@ func drop(name string) {
os.RemoveAll(appDataPath)
}
func autoBalloon(l *libvirt.Libvirt) {
domains, err := l.Domains()
if err != nil {
log.Fatal(err)
}
const memoryMin = 512 * 1024 // 512 MiB
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Application VM", "Used memory", "Current memory", "Max memory", "New memory"})
for _, d := range domains {
if d.Name[0:5] == "appvm" {
name := d.Name[6:]
memoryUsedRaw, err := ioutil.ReadFile(os.Getenv("HOME") + "/appvm/" + name + "/.memory_used")
if err != nil {
log.Fatal(err)
}
memoryUsedMiB, err := strconv.Atoi(string(memoryUsedRaw[0 : len(memoryUsedRaw)-1]))
if err != nil {
log.Fatal(err)
}
memoryUsed := memoryUsedMiB * 1024
_, memoryMax, memoryCurrent, _, _, err := l.DomainGetInfo(d)
if err != nil {
log.Fatal(err)
}
memoryNew := uint64(float64(memoryUsed) * 1.2) // +20%
if memoryNew > memoryMax {
memoryNew = memoryMax - 1
}
if memoryNew < memoryMin {
memoryNew = memoryMin
}
err = l.DomainSetMemory(d, memoryNew)
if err != nil {
log.Fatal(err)
}
table.Append([]string{name,
fmt.Sprintf("%d", memoryUsed),
fmt.Sprintf("%d", memoryCurrent),
fmt.Sprintf("%d", memoryMax),
fmt.Sprintf("%d", memoryNew)})
}
}
table.Render()
}
func main() {
c, err := net.DialTimeout("unix", "/var/run/libvirt/libvirt-sock", time.Second)
if err != nil {
@ -252,6 +308,7 @@ func main() {
defer l.Disconnect()
kingpin.Command("list", "List applications")
kingpin.Command("autoballoon", "Automatically adjust/reduce app vm memory")
startName := kingpin.Command("start", "Start application").Arg("name", "Application name").Required().String()
stopName := kingpin.Command("stop", "Stop application").Arg("name", "Application name").Required().String()
dropName := kingpin.Command("drop", "Remove application data").Arg("name", "Application name").Required().String()
@ -265,5 +322,7 @@ func main() {
stop(l, *stopName)
case "drop":
drop(*dropName)
case "autoballoon":
autoBalloon(l)
}
}