mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-23 12:31:07 +01:00
015f0b0424
Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Signed-off-by: f41gh7 <nik@victoriametrics.com>
328 lines
13 KiB
Markdown
328 lines
13 KiB
Markdown
---
|
|
weight: 3
|
|
title: VMAlertmanager
|
|
menu:
|
|
docs:
|
|
identifier: operator-cr-vmalertmanager
|
|
parent: operator-cr
|
|
weight: 3
|
|
aliases:
|
|
- /operator/resources/vmalertmanager/
|
|
- /operator/resources/vmalertmanager/index.html
|
|
---
|
|
`VMAlertmanager` - represents [alertmanager](https://prometheus.io/docs/alerting/latest/alertmanager/) configuration.
|
|
|
|
The `VMAlertmanager` CRD declaratively defines a desired Alertmanager setup to run in a Kubernetes cluster.
|
|
It provides options to configure replication and persistent storage.
|
|
|
|
For each `Alertmanager` resource, the Operator deploys a properly configured `StatefulSet` in the same namespace.
|
|
The Alertmanager pods are configured to include a `Secret` called `<alertmanager-name>` which holds the used
|
|
configuration file in the key `alertmanager.yaml`.
|
|
|
|
When there are two or more configured replicas the Operator runs the Alertmanager instances in high availability mode.
|
|
|
|
## Specification
|
|
|
|
You can see the full actual specification of the `VMAlertmanager` resource in the **[API docs -> VMAlertManager](https://docs.victoriametrics.com/operator/api#vmalertmanager)**.
|
|
|
|
If you can't find necessary field in the specification of the custom resource,
|
|
see [Extra arguments section](./#extra-arguments).
|
|
|
|
Also, you can check out the [examples](#examples) section.
|
|
|
|
## Configuration
|
|
|
|
The operator generates a configuration file for `VMAlertmanager` based on user input at the definition of `CRD`.
|
|
|
|
Generated config stored at `Secret` created by the operator, it has the following name template `vmalertmanager-CRD_NAME-config`.
|
|
|
|
This configuration file is mounted at `VMAlertmanager` `Pod`. A special side-car container tracks its changes and sends config-reload signals to `alertmanager` container.
|
|
|
|
The operator generates default configuration with `blackhole` root route. It needs to properly start alertmanager container with empty configuration.
|
|
|
|
### Using secret
|
|
|
|
Basically, you can use the global configuration defined at manually created `Secret`. This `Secret` must be created before `VMAlertmanager`.
|
|
|
|
Name of the `Secret` must be defined at `VMAlertmanager` `spec.configSecret` option:
|
|
|
|
```yaml
|
|
apiVersion: v1
|
|
kind: Secret
|
|
metadata:
|
|
name: alertmanager-config
|
|
labels:
|
|
app: vm-operator
|
|
type: Opaque
|
|
stringData:
|
|
alertmanager.yaml: |
|
|
global:
|
|
resolve_timeout: 5m
|
|
route:
|
|
receiver: 'webhook'
|
|
receivers:
|
|
- name: 'webhook'
|
|
webhook_configs:
|
|
- url: 'http://alertmanagerwh:30500/'
|
|
|
|
---
|
|
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: example-alertmanager
|
|
spec:
|
|
replicaCount: 2
|
|
configSecret: alertmanager-config
|
|
```
|
|
|
|
### Using inline raw config
|
|
|
|
Also, if there is no secret data at configuration, or you just want to redefine some global variables for `alertmanager`.
|
|
You can define configuration at `spec.configRawYaml` section of `VMAlertmanager` configuration:
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: example-alertmanager
|
|
spec:
|
|
replicaCount: 2
|
|
configRawYaml: |
|
|
global:
|
|
resolve_timeout: 5m
|
|
route:
|
|
receiver: 'default'
|
|
group_interval: 5m
|
|
repeat_interval: 12h
|
|
receivers:
|
|
- name: 'default'
|
|
```
|
|
|
|
If both `configSecret` and `configRawYaml` are defined, only configuration from `configRawYaml` will be used. Values from `configSecret` will be ignored.
|
|
|
|
### Using VMAlertmanagerConfig
|
|
|
|
See details at [VMAlertmanagerConfig](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig).
|
|
|
|
The CRD specifies which `VMAlertmanagerConfig`s should be covered by the deployed `VMAlertmanager` instances based on label selection.
|
|
The Operator then generates a configuration based on the included `VMAlertmanagerConfig`s and updates the `Secret` containing
|
|
the configuration. It continuously does so for all changes that are made to `VMAlertmanagerConfig`s or to the `VMAlertmanager` resource itself.
|
|
|
|
Main goal of operator - generate safe configuration for alertmanager. In case of any of misconfiguration at `VMAlertmanagerConfig` operator skips it from config generation and updates `VMAlertmanagerConfig` `Status` field with error cause.
|
|
|
|
Configs are filtered by selectors `configNamespaceSelector` and `configSelector` in `VMAlertmanager` CRD definition.
|
|
For selecting rules from all namespaces you must specify it to empty value:
|
|
|
|
```yaml
|
|
spec:
|
|
configSelector: {}
|
|
configNamespaceSelector: {}
|
|
```
|
|
|
|
[VMAlertmanagerConfig](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig) objects are
|
|
generates part of [VMAlertmanager](https://docs.victoriametrics.com/operator/resources/vmalertmanager) configuration.
|
|
|
|
For filtering rules `VMAlertmanager` uses selectors `configNamespaceSelector` and `configSelector`.
|
|
It allows configuring rules access control across namespaces and different environments.
|
|
Specification of selectors you can see in [this doc](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#labelselector-v1-meta).
|
|
|
|
In addition to the above selectors, the filtering of objects in a cluster is affected by the field `selectAllByDefault`
|
|
of `VMAlertmanager` spec and environment variable `WATCH_NAMESPACE` for operator.
|
|
|
|
Following rules are applied:
|
|
|
|
- If `configNamespaceSelector` and `configSelector` both undefined, then by default select nothing. With option set - `spec.selectAllByDefault: true`, select all vmalertmanagerconfigs.
|
|
- If `configNamespaceSelector` defined, `configSelector` undefined, then all vmalertmanagerconfigs are matching at namespaces for given `configNamespaceSelector`.
|
|
- If `configNamespaceSelector` undefined, `configSelector` defined, then all vmalertmanagerconfigs at `VMAlertmanager`'s namespaces are matching for given `configSelector`.
|
|
- If `configNamespaceSelector` and `configSelector` both defined, then only vmalertmanagerconfigs at namespaces matched `configNamespaceSelector` for given `configSelector` are matching.
|
|
|
|
Here's a more visual and more detailed view:
|
|
|
|
| `configNamespaceSelector` | `configSelector` | `selectAllByDefault` | `WATCH_NAMESPACE` | Selected rules |
|
|
| ------------------------- | ---------------- | -------------------- | ----------------- | ---------------------------------------------------------------------------------------------------------------------- |
|
|
| undefined | undefined | false | undefined | nothing |
|
|
| undefined | undefined | **true** | undefined | all vmalertmanagerconfigs in the cluster |
|
|
| **defined** | undefined | *any* | undefined | all vmalertmanagerconfigs are matching at namespaces for given `configNamespaceSelector` |
|
|
| undefined | **defined** | *any* | undefined | all vmalertmanagerconfigs only at `VMAlertmanager`'s namespace are matching for given `ruleSelector` |
|
|
| **defined** | **defined** | *any* | undefined | all vmalertmanagerconfigs only at namespaces matched `configNamespaceSelector` for given `configSelector` are matching |
|
|
| *any* | undefined | *any* | **defined** | all vmalertmanagerconfigs only at `VMAlertmanager`'s namespace |
|
|
| *any* | **defined** | *any* | **defined** | all vmalertmanagerconfigs only at `VMAlertmanager`'s namespace for given `configSelector` are matching |
|
|
|
|
More details about `WATCH_NAMESPACE` variable you can read in [this doc](https://docs.victoriametrics.com/operator/configuration#namespaced-mode).
|
|
|
|
Here are some examples of `VMAlertmanager` configuration with selectors:
|
|
|
|
```yaml
|
|
# select all config objects in the cluster
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: vmalertmanager-select-all
|
|
spec:
|
|
# ...
|
|
selectAllByDefault: true
|
|
|
|
---
|
|
|
|
# select all config objects in specific namespace (my-namespace)
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: vmalertmanager-select-ns
|
|
spec:
|
|
# ...
|
|
configNamespaceSelector:
|
|
matchLabels:
|
|
kubernetes.io/metadata.name: my-namespace
|
|
```
|
|
|
|
### Extra configuration files
|
|
|
|
`VMAlertmanager` specification has the following fields, that can be used to configure without editing raw configuration file:
|
|
|
|
- `spec.templates` - list of keys in `ConfigMaps`, that contains template files for `alertmanager`, e.g.:
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: example-alertmanager
|
|
spec:
|
|
replicaCount: 2
|
|
templates:
|
|
- name: alertmanager-templates
|
|
key: my-template-1.tmpl
|
|
- name: alertmanager-templates
|
|
key: my-template-2.tmpl
|
|
---
|
|
apiVersion: v1
|
|
kind: ConfigMap
|
|
metadata:
|
|
name: alertmanager-templates
|
|
data:
|
|
my-template-1.tmpl: |
|
|
{{ define "hello" -}}
|
|
hello, Victoria!
|
|
{{- end }}
|
|
my-template-2.tmpl: """
|
|
```
|
|
|
|
These templates will be automatically added to `VMAlertmanager` configuration and will be automatically reloaded on changes in source `ConfigMap`.
|
|
|
|
- `spec.configMaps` - list of `ConfigMap` names (in the same namespace) that will be mounted at `VMAlertmanager`
|
|
workload and will be automatically reloaded on changes in source `ConfigMap`. Mount path is `/etc/vm/configs/<configmap-name>`.
|
|
|
|
### Behavior without provided config
|
|
|
|
If no configuration is provided, operator configures stub configuration with blackhole route.
|
|
|
|
## High Availability
|
|
|
|
The final step of the high availability scheme is Alertmanager, when an alert triggers, actually fire alerts against *all* instances of an Alertmanager cluster.
|
|
|
|
The Alertmanager, starting with the `v0.5.0` release, ships with a high availability mode.
|
|
It implements a gossip protocol to synchronize instances of an Alertmanager cluster
|
|
regarding notifications that have been sent out, to prevent duplicate notifications.
|
|
It is an AP (available and partition tolerant) system. Being an AP system means that notifications are guaranteed to be sent at least once.
|
|
|
|
The Victoria Metrics Operator ensures that Alertmanager clusters are properly configured to run highly available on Kubernetes.
|
|
|
|
## Version management
|
|
|
|
To set `VMAlertmanager` version add `spec.image.tag` name from [releases](https://github.com/VictoriaMetrics/VictoriaMetrics/releases)
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: example-vmalertmanager
|
|
spec:
|
|
image:
|
|
repository: prom/alertmanager
|
|
tag: v0.25.0
|
|
pullPolicy: Always
|
|
# ...
|
|
```
|
|
|
|
Also, you can specify `imagePullSecrets` if you are pulling images from private repo:
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: example-vmalertmanager
|
|
spec:
|
|
image:
|
|
repository: prom/alertmanager
|
|
tag: v0.25.0
|
|
pullPolicy: Always
|
|
imagePullSecrets:
|
|
- name: my-repo-secret
|
|
# ...
|
|
```
|
|
|
|
## Resource management
|
|
|
|
You can specify resources for each `VMAlertManager` resource in the `spec` section of the `VMAlertManager` CRD.
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertManager
|
|
metadata:
|
|
name: vmalertmanager-resources-example
|
|
spec:
|
|
# ...
|
|
resources:
|
|
requests:
|
|
memory: "64Mi"
|
|
cpu: "250m"
|
|
limits:
|
|
memory: "128Mi"
|
|
cpu: "500m"
|
|
# ...
|
|
```
|
|
|
|
If these parameters are not specified, then,
|
|
by default all `VMAlertManager` pods have resource requests and limits from the default values of the following [operator parameters](https://docs.victoriametrics.com/operator/configuration):
|
|
|
|
- `VM_VMALERTMANAGER_RESOURCE_LIMIT_MEM` - default memory limit for `VMAlertManager` pods,
|
|
- `VM_VMALERTMANAGER_RESOURCE_LIMIT_CPU` - default memory limit for `VMAlertManager` pods,
|
|
- `VM_VMALERTMANAGER_RESOURCE_REQUEST_MEM` - default memory limit for `VMAlertManager` pods,
|
|
- `VM_VMALERTMANAGER_RESOURCE_REQUEST_CPU` - default memory limit for `VMAlertManager` pods.
|
|
|
|
These default parameters will be used if:
|
|
|
|
- `VM_VMALERTMANAGER_USEDEFAULTRESOURCES` is set to `true` (default value),
|
|
- `VMAlertManager` CR doesn't have `resources` field in `spec` section.
|
|
|
|
Field `resources` in `VMAlertManager` spec have higher priority than operator parameters.
|
|
|
|
If you set `VM_VMALERTMANAGER_USEDEFAULTRESOURCES` to `false` and don't specify `resources` in `VMAlertManager` CRD,
|
|
then `VMAlertManager` pods will be created without resource requests and limits.
|
|
|
|
Also, you can specify requests without limits - in this case default values for limits will not be used.
|
|
|
|
## Examples
|
|
|
|
```yaml
|
|
apiVersion: operator.victoriametrics.com/v1beta1
|
|
kind: VMAlertmanager
|
|
metadata:
|
|
name: vmalertmanager-example
|
|
spec:
|
|
replicaCount: 1
|
|
configRawYaml: |
|
|
global:
|
|
resolve_timeout: 5m
|
|
route:
|
|
group_wait: 30s
|
|
group_interval: 5m
|
|
repeat_interval: 12h
|
|
receiver: 'webhook'
|
|
receivers:
|
|
- name: 'webhook'
|
|
webhook_configs:
|
|
- url: 'http://localhost:30502/'
|
|
```
|