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18fc512fc4
With a bond interface the state of the slave interface from the bond's point of view is reflected in `mii_status` and is independent of the link's `operstate`. When a bond is monitored with `miimon`, `mii_status` will reflect the state of the physical link as configured via the operator. When a bond is monitored via `arp_interval` the `mii_status` will reflect the results of the bond ARP checking. This means the link can be down from the bond's point of view, but up from a physical connection point of view. If a bond is not monitored via miimon or arp, the `mii_status` should likely be always `up`, however I have observed a case where this is not true and the `operstate` is `up` while `mii_status` is `down`. Kernel bond documentation stresses that a bond should not be configured without one of `mii_mon` or `arp_interval` configured however. This change results in the metric 'node_bonding_active' matching the up/down state of the bond's point of view rather than operstate. Signed-off-by: Sachi King <nakato@nakato.io>
102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nobonding
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package collector
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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type bondingCollector struct {
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slaves, active typedDesc
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}
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func init() {
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registerCollector("bonding", defaultEnabled, NewBondingCollector)
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}
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// NewBondingCollector returns a newly allocated bondingCollector.
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// It exposes the number of configured and active slave of linux bonding interfaces.
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func NewBondingCollector() (Collector, error) {
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return &bondingCollector{
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slaves: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "bonding", "slaves"),
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"Number of configured slaves per bonding interface.",
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[]string{"master"}, nil,
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), prometheus.GaugeValue},
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active: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "bonding", "active"),
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"Number of active slaves per bonding interface.",
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[]string{"master"}, nil,
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), prometheus.GaugeValue},
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}, nil
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}
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// Update reads and exposes bonding states, implements Collector interface. Caution: This works only on linux.
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func (c *bondingCollector) Update(ch chan<- prometheus.Metric) error {
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statusfile := sysFilePath("class/net")
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bondingStats, err := readBondingStats(statusfile)
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if err != nil {
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if os.IsNotExist(err) {
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log.Debugf("Not collecting bonding, file does not exist: %s", statusfile)
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return nil
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}
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return err
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}
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for master, status := range bondingStats {
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ch <- c.slaves.mustNewConstMetric(float64(status[0]), master)
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ch <- c.active.mustNewConstMetric(float64(status[1]), master)
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}
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return nil
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}
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func readBondingStats(root string) (status map[string][2]int, err error) {
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status = map[string][2]int{}
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masters, err := ioutil.ReadFile(filepath.Join(root, "bonding_masters"))
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if err != nil {
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return nil, err
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}
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for _, master := range strings.Fields(string(masters)) {
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slaves, err := ioutil.ReadFile(filepath.Join(root, master, "bonding", "slaves"))
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if err != nil {
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return nil, err
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}
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sstat := [2]int{0, 0}
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for _, slave := range strings.Fields(string(slaves)) {
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state, err := ioutil.ReadFile(filepath.Join(root, master, fmt.Sprintf("lower_%s", slave), "bonding_slave", "mii_status"))
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if os.IsNotExist(err) {
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// some older? kernels use slave_ prefix
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state, err = ioutil.ReadFile(filepath.Join(root, master, fmt.Sprintf("slave_%s", slave), "bonding_slave", "mii_status"))
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}
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if err != nil {
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return nil, err
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}
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sstat[0]++
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if strings.TrimSpace(string(state)) == "up" {
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sstat[1]++
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}
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}
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status[master] = sstat
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}
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return status, err
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}
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