Questions about IPMI driver workflow and retry intervals

huy123 · 22 May 2026 03:48

Quick question about the IPMI power driver and how it uses ipmipower (from freeipmi-tools). Just want to make sure I have the exact workflow straight:

1. Temporal grabs the task, figures out the right worker group, and routes the power-on action to the Go Agent worker queue for that node’s VLAN.

2. The Go code handles this inside PowerOn(), maps out the driver arguments (swapping underscores for dashes, like --power-address), and kicks off the shell command.

github.com/canonical/maas

src/provisioningserver/drivers/power/ipmi.py

3.5.4

# Copyright 2015-2021 Canonical Ltd.  This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).

"""IPMI Power Driver."""


import enum
import re
from tempfile import NamedTemporaryFile

from provisioningserver.drivers import (
    make_ip_extractor,
    make_setting_field,
    SETTING_SCOPE,
)
from provisioningserver.drivers.power import (
    is_power_parameter_set,
    PowerAuthError,
    PowerConnError,
    PowerDriver,

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github.com/canonical/maas

src/maasagent/internal/power/service.go

3.5.4

package power

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"reflect"
	"strings"
	"time"

	"go.temporal.io/sdk/activity"
	tworker "go.temporal.io/sdk/worker"
	tworkflow "go.temporal.io/sdk/workflow"
	"maas.io/core/src/maasagent/internal/workflow/log/tag"
	"maas.io/core/src/maasagent/internal/workflow/worker"
)

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We’re hitting an issue with some of our servers because they are unable to boot up after 2 or 3 successful deployments. The logs show the error: “unable to control BMC. Please check credential”.

Because of this, I wanted to ask:

1. How many times does this sequence actually get called?

2. Is there any wait time between retries if a server is slow to spin up?

We’re currenly running MAAS 3.5.4

r00ta · 23 May 2026 06:09

are you deploying the machine or are you making simple power operations (power-on, power-off)?

huy123 · 23 May 2026 15:44

deploying machine so I think its power-cycle option ? with –cycle –on-if-off