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What is Alertmanager?

The Alertmanager handles alerts sent by client applications such as the Prometheus server. It takes care of deduplicating, grouping, and routing them to the correct receiver integrations such as email, PagerDuty, or OpsGenie. It also takes care of silencing and inhibition of alerts.

https://github.com/prometheus/alertmanager

TL;DR;

$ docker run --name alertmanager bitnami/alertmanager:latest

Why use Bitnami Images?

Bitnami closely tracks upstream source changes and promptly publishes new versions of this image using our automated systems.
With Bitnami images the latest bug fixes and features are available as soon as possible.
Bitnami containers, virtual machines and cloud images use the same components and configuration approach - making it easy to switch between formats based on your project needs.
Bitnami images are built on CircleCI and automatically pushed to the Docker Hub.
All our images are based on minideb a minimalist Debian based container image which gives you a small base container image and the familiarity of a leading linux distribution.

Get this image

The recommended way to get the Bitnami Alertmanager Docker Image is to pull the prebuilt image from the Docker Hub Registry.

$ docker pull bitnami/alertmanager:latest

To use a specific version, you can pull a versioned tag. You can view the list of available versions in the Docker Hub Registry.

$ docker pull bitnami/alertmanager:[TAG]

If you wish, you can also build the image yourself.

$ docker build -t bitnami/alertmanager:latest https://github.com/bitnami/bitnami-docker-alertmanager.git

Persisting your application

If you remove the container all your data and configurations will be lost, and the next time you run the image the database will be reinitialized. To avoid this loss of data, you should mount a volume that will persist even after the container is removed.

For persistence you should mount a volume at the /opt/bitnami/data path. The above examples define a docker volume namely alertmanager_data. The Alertmanager application state will persist as long as this volume is not removed.

To avoid inadvertent removal of this volume you can mount host directories as data volumes. Alternatively you can make use of volume plugins to host the volume data.

$ docker run -v /path/to/alertmanager-persistence:/opt/bitnami/data bitnami/alertmanager:latest

Connecting to other containers

Using Docker container networking, a different server running inside a container can easily be accessed by your application containers and vice-versa.

Containers attached to the same network can communicate with each other using the container name as the hostname.

Using the Command Line

Step 1: Create a network

$ docker network create alertmanager-network --driver bridge

Step 2: Launch the Alertmanager container within your network

Use the --network <NETWORK> argument to the docker run command to attach the container to the alertmanager-network network.

$ docker run --name alertmanager-node1 --network alertmanager-network bitnami/alertmanager:latest

Step 3: Run another containers

We can launch another containers using the same flag (--network NETWORK) in the docker run command. If you also set a name to your container, you will be able to use it as hostname in your network.

Configuration

Configuration is yaml based. The full documentation of the configuration can be found here.

This file is located at /opt/bitnami/alertmanager/conf/config.yml, you can check the [Persisting your data](# Persisting your application) section to add a custom volume to modify it.

Amtool

amtool is a cli tool for interacting with the alertmanager api. It is bundled with all releases of alertmanager.

Mounting a volume

Check the [Persisting your data](# Persisting your application) section to add custom volumes to the Alertmanager container

Logging

The Bitnami alertmanager Docker image sends the container logs to the stdout. To view the logs:

$ docker logs alertmanager

You can configure the containers logging driver using the --log-driver option if you wish to consume the container logs differently. In the default configuration docker uses the json-file driver.

Maintenance

Upgrade this image

Bitnami provides up-to-date versions of alertmanager, including security patches, soon after they are made upstream. We recommend that you follow these steps to upgrade your container.

Step 1: Get the updated image

$ docker pull bitnami/alertmanager:latest

Step 2: Stop and backup the currently running container

Stop the currently running container using the command

$ docker stop alertmanager

Next, take a snapshot of the persistent volume /path/to/alertmanager-persistence using:

$ rsync -a /path/to/alertmanager-persistence /path/to/alertmanager-persistence.bkp.$(date +%Y%m%d-%H.%M.%S)

You can use this snapshot to restore the database state should the upgrade fail.

Step 3: Remove the currently running container

$ docker rm -v alertmanager

Step 4: Run the new image

Re-create your container from the new image, restoring your backup if necessary.

$ docker run --name alertmanager bitnami/alertmanager:latest

Contributing

We'd love for you to contribute to this container. You can request new features by creating an issue, or submit a pull request with your contribution.

Issues

If you encountered a problem running this container, you can file an issue. For us to provide better support, be sure to include the following information in your issue:

Host OS and version
Docker version (docker version)
Output of docker info
Version of this container
The command you used to run the container, and any relevant output you saw (masking any sensitive information)

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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