A simple daemon to send notifications based on Consul health checks.
- Consul 0.4+. Get it here.
- Configured
GOPATH.
Stable release are here.
Latest release are found here:
$ go get github.com/AcalephStorage/consul-alerts
$ go install
This should install consul-alerts to $GOPATH/bin
or pull the image from docker:
$ docker pull acaleph/consul-alerts
$ consul-alerts start
or using docker:
$ docker run acaleph/consul-alerts start
By default, this runs the daemon and API at localhost:9000 and connects to the local consul agent (localhost:8500) and default datacenter (dc1). These can be overriden by the following flags:
$ consul-alerts start --alert-addr=localhost:9000 --consul-addr=localhost:8500 --consul-dc=dc1
Note: Don't change --alert-addr when using the docker container.
Once the daemon is running, it can act as a handler for consul watches. At the moment only checks and events are supported.
$ consul watch -type checks consul-alerts watch checks [--alert-addr=localhost:9000]
$ consul watch -type event consul-alerts watch event [--alert-addr=localhost:9000]
or run the watchers on the agent the daemon connects by adding the following flags during consul-alerts run:
$ consul-alerts start --watch-events --watch-checks
All configurations are stored in consul's KV with the prefix: consul-alerts/config/. The daemon is using default values and the KV entries will only override the defaults.
Health checking is enabled by default. This also triggers the notification when a check has changed status for a configured duration. Health checks can be disabled by setting the kvconsul-alerts/config/checks/enabled to false.
To prevent flapping, notifications are only sent when a check status has been stable for a specific time in seconds (60 by default). this value can be changed by adding/changing the kv consul-alerts/config/checks/change-threshold to an integer greater than and divisible by 10.
eg. consul-alerts/config/checks/change-threshold = 30
There are four ways to enable/disable health check notifications: mark them by node, serviceID, checkID, or mark individually by node/serviceID/checkID. This is done by adding a KV entry in consul-alerts/config/checks/blacklist/.... Removing the entry will re-enable the check notifications.
Add a KV entry with the key consul-alerts/config/checks/blacklist/nodes/{{ nodeName }}. This will disable notifications for the specified nodeName.
Add a KV entry with the key consul-alerts/config/checks/blacklist/services/{{ serviceId }}. This will disable notifications for the specified serviceId.
Add a KV entry with the key consul-alerts/config/checks/blacklist/checks/{{ checkId }}. This will disable notifications for the specified checkId.
Add a KV entry with the key consul-alerts/config/checks/blacklist/single/{{ node }}/{{ serviceId }}/{{ checkId }}. This will disable the specific health check. If the health check is not associated with a service, use the _ as the serviceId.
Event handling is enabled by default. This delegates any consul event received by the agent to the list of handlers configured. To disable event handling, set consul-alerts/config/events/enabled to false.
Handlers can be configured by adding them to consul-alerts/config/events/handlers. This should be a JSON array of string. Each string should point to any executable. The event data should be read from stdin.
There are four builtin notifiers. Only the Log notifier is enabled by default. It is also possible to add custom notifiers similar to custom event handlers. Custom notifiers can be added in consul-alerts/config/notifiers/custom.
This logs any health check notification to a file. To disable this notifier, set consul-alerts/config/notifiers/log/enabled to false.
The log file is set to /tmp/consul-notifications.log by default. This can be changed by changing consul-alerts/config/notifiers/log/path.
This emails the health notifications. To enable this, set consul-alerts/config/notifiers/email/enabled to true.
The email and smtp details needs to be configured:
prefix: consul-alerts/config/notifiers/email/
| key | description |
|---|---|
| enabled | Enable the email notifier. [Default: false] |
| cluster-name | The name of the cluster. [Default: "Consul Alerts"] |
| url | The SMTP server url |
| port | The SMTP server port |
| username | The SMTP username |
| password | The SMTP password |
| sender-alias | The sender alias. [Default: "Consul Alerts"] |
| sender-email | The sender email |
| receivers | The emails of the receivers. JSON array of string |
| template | Path to custom email template. [Default: internal template] |
The template can be any go html template. An EmailData instance will be passed to the template.
This sends the notifications as series points in influxdb. Set consul-alerts/config/notifiers/influxdb/enabled to true to enabled. InfluxDB details need to be set too.
prefix: consul-alerts/config/notifiers/influxdb/
| key | description |
|---|---|
| enabled | Enable the influxdb notifier. [Default: false] |
| host | The influxdb host. (eg. localhost:8086) |
| username | The influxdb username |
| password | The influxdb password |
| database | The influxdb database name |
| series-name | The series name for the points |
Slack integration is also supported. To enable, set
consul-alerts/config/notifiers/slack/enabled to true. Slack details needs to
be configured.
prefix: consul-alerts/config/notifiers/slack/
| key | description |
|---|---|
| enabled | Enable the Slack notifier. [Default: false] |
| cluster-name | The name of the cluster. [Default: "Consul Alerts"] |
| url | The incoming-webhook url (mandatory) |
| channel | The channel to post the notification (mandatory) |
| username | The username to appear on the post |
| icon-url | URL of a custom image for the notification |
| icon-emoji | Emoji (if not using icon-url) for the notification |
In order to enable slack integration, you have to create a new Incoming WebHooks. Then use the token created by the previous action.
To enable PagerDuty built-in notifier, set consul-alerts/config/notifiers/pagerduty/enabled to true. This is disabled by default. Service key and client details also needs to be configured.
prefix: consul-alerts/config/notifiers/pagerduty/
| key | description |
|---|---|
| enabled | Enable the PagerDuty notifier. [Default: false] |
| service-key | Service key to access PagerDuty |
| client-name | The monitoring client name |
| client-url | The monitoring client url |
Health status can also be queried via the API. This can be used for compatibility with nagios, sensu, or other monitoring tools. To get the status of a specific check, use the following entrypoint.
http://consul-alerts:9000/v1/health?node=<node>&service=<serviceId>&check=<checkId>
This will return the output of the check and the following HTTP codes:
| Status | Code |
|---|---|
| passing | 200 |
| warning | 503 |
| critical | 503 |
| unknown | 404 |
PRs are more than welcome. Just fork, create a feature branch, and open a PR. We love PRs. :)
This is a port from a tool we developed recently, there are still a few things missing like loading a custom configuration via command/api instead of manually editing consul's KV. Also need to set up a reminder feature. Needs better doc and some cleanup too. :)