AWS Fargate monitoring

To deploy OneAgent on AWS Fargate, read the instructions provided below.

Prerequisites

Create an API token in your Dynatrace environment and enable the following permissions:
- Access problem and event feed, metrics, and topology (API v1)
- PaaS integration - Installer download
Review the list of supported applications and versions.

Integrate OneAgent into your application image

There are three ways to integrate OneAgent with AWS Fargate applications.

Automatic injection EKS

With automatic injection you can manage upgrades and lifecycle.

Kubernetes version 1.20+

On AWS Fargate, only the applicationMonitoring deployment without the CSI driver is supported.

Before you start installation, make sure you have a running AWS Fargate cluster. For details, see Getting started with AWS Fargate using Amazon EKS.

Add a Fargate profile to define the Dynatrace Operator deployment.

Be sure it matches the dynatrace namespace where Dynatrace Operator will be deployed.
Create a dynatrace namespace.
```
kubectl create namespace dynatrace
```

Install Dynatrace Operator.

kubectl apply -f https://github.com/Dynatrace/dynatrace-operator/releases/download/v1.4.0/kubernetes.yaml

Create the secret holding the API token for authentication to the Dynatrace cluster.

Be sure to replace <API_TOKEN> with your own value.
```
kubectl -n dynatrace create secret generic dynakube --from-literal="apiToken=<API_TOKEN>"
```
Download the preconfigured DynaKube custom resource sample file from GitHub.
Review the available parameters, and adapt the DynaKube custom resource according to your requirements.

Apply the DynaKube custom resource.

kubectl apply -f applicationMonitoring.yaml

Build-time injection EKS and ECS

With build-time injection you can embed OneAgent into your container image.

To use this option you need:

Docker version 17.05+
OneAgent version 1.155+

Sign in to Docker with your Dynatrace environment ID as username and PaaS token as password.
```
docker login -u <your-environment-id> <your-environment-url>
```

Replace <your-environment-url> with the URL or IP address of your environment or of your ActiveGate.
- Dynatrace SaaS {your-environment-id}.live.dynatrace.com¹
- Dynatrace Managed {your-domain}/e/{your-environment-id}¹
  
  ¹
  If you use your own environment ActiveGate, use the <ip-address>:9999 or <hostname>:9999 format.

Add two additional lines of code to the application image, after the last FROM command:

COPY --from=<your-environment-url>/linux/oneagent-codemodules:<technology> / /
ENV LD_PRELOAD /opt/dynatrace/oneagent/agent/lib64/liboneagentproc.so

Replace <technology> with the code module required for your application. Valid options are all, java, apache, nginx, nodejs, dotnet, php, sdk, and go. You can specify several code modules, separated by hyphen (-), for example java-go. Including specific technology-support options, rather than support for all technology options, results in a smaller OneAgent package.

What if my Docker image is based on Alpine Linux?

Dynatrace OneAgent supports Alpine Linux based environments. Use this syntax:

COPY --from=<your-activegate>/linux/oneagent-codemodules-musl:<technology> / /
ENV LD_PRELOAD /opt/dynatrace/oneagent/agent/lib64/liboneagentproc.so

Valid options here are all, go, java, apache, nginx, and nodejs.

Build your application image.

Build the Docker image from your dockerfile to use it in your Kubernetes environment:
```
docker build -t yourapp .
```
You can monitor your application containers with a different Dynatrace environment. To do this, read the instructions below:

For OneAgent version 1.139+, if you have an existing application image where you've already added the OneAgent code modules for a specific Dynatrace environment, you can have the OneAgent report to another Dynatrace environment without rebuilding your application image.

For this you need to make a call to the REST endpoint of your second Dynatrace environment. Make sure to adapt the respective placeholders <your-environment-id> and <your-paas-token>.
```
curl "https://<your-environment-id>.live.dynatrace.com/api/v1/deployment/installer/agent/connectioninfo?Api-Token=<your-paas-token>"
```
In return, you get a JSON object that covers the required information that needs to be passed as an environment variable to the application container. Make sure you set the environment variables of the application container as described below:
- DT_TENANT: equals tenantUUID
- DT_TENANTTOKEN: equals tenantToken
- DT_CONNECTION_POINT: semi-colon separated list of communicationEndpoints

To utilize distroless images (stripped-down versions of regular Docker images containing the only essentials required to run an application), OneAgent needs to be called in an executable form using the command instruction CMD, instead of ENTRYPOINT.

Add the following commands to your current Dockerfile to integrate OneAgent and activate instrumentation of your application. Define variables with optional default values using ARG instructions.
```
ARG DT_API_URL="https://<your-environment-id>.live.dynatrace.com/api"
ARG DT_API_TOKEN="<your-paas-token>"
ARG DT_ONEAGENT_OPTIONS="flavor=default&include=<technology1>&include=<technology2>"
ENV DT_HOME="/opt/dynatrace/oneagent"
RUN mkdir -p "$DT_HOME" && \
    wget -O "$DT_HOME/oneagent.zip" "$DT_API_URL/v1/deployment/installer/agent/unix/paas/latest?Api-Token=$DT_API_TOKEN&$DT_ONEAGENT_OPTIONS" && \
    unzip -d "$DT_HOME" "$DT_HOME/oneagent.zip" && \
    rm "$DT_HOME/oneagent.zip"
ENTRYPOINT [ "/opt/dynatrace/oneagent/dynatrace-agent64.sh" ]
CMD [ "executable", "param1", "param2" ] # the command of your application, for example, Java
```
The commands above that use wget and unzip might fail if they aren't provided by the base image.

Replace <your-environment-id> with your Dynatrace environment ID. If you're using Dynatrace Managed, you need to provide your Dynatrace Cluster URL (https://<YourDynatraceServerURL>/e/<your-environment-id>/api).

Replace <your-paas-token> with your PaaS token.

DT_ONEAGENT_OPTIONS - this is the flavor (valid options are default or musl for Alpine images) and the technology (code module).

Syntax for default is flavor=default&include=all.
Syntax for musl is flavor=musl&include=all.
What if my Docker image is based on Alpine Linux?
Dynatrace OneAgent supports the flavor musl for Alpine Linux based environments. Valid options for flavor=musl are all, go, java, apache, nginx, and nodejs.
Build your application image.

Build the Docker image from your dockerfile to use it in your Kubernetes environment:
```
docker build -t yourapp .
```
You can monitor your application containers with a different Dynatrace environment. To do this, read the instructions below:

For OneAgent version 1.139+, if you have an existing application image where you've already added the OneAgent code modules for a specific Dynatrace environment, you can have the OneAgent report to another Dynatrace environment without rebuilding your application image.

For this you need to make a call to the REST endpoint of your second Dynatrace environment. Make sure to adapt the respective placeholders <your-environment-id> and <your-paas-token>.
```
curl "https://<your-environment-id>.live.dynatrace.com/api/v1/deployment/installer/agent/connectioninfo?Api-Token=<your-paas-token>"
```
In return, you get a JSON object that covers the required information that needs to be passed as an environment variable to the application container. Make sure you set the environment variables of the application container as described below:
- DT_TENANT: equals tenantUUID
- DT_TENANTTOKEN: equals tenantToken
- DT_CONNECTION_POINT: semi-colon separated list of communicationEndpoints

Runtime injection ECS

With runtime injection you can pull OneAgent when the container starts. To install Dynatrace OneAgent at runtime, you must deploy your application using a task with two container definitions. One is for downloading and unzipping the OneAgent to a shared volume, the other is your application container, which must mount the same volume.

For the runtime injection, follow the steps below.

Go to Fargate Task Definition > Create New Task Definition > select Fargate > click Next Step.
Name the task, optionally set roles and sizes, then scroll down to Volumes > Add volume. Add a volume of type Bind Mount named oneagent.

You must create a volume before creating container definitions in order to set the shared volume in each container.
Scroll up to Container Definition > choose Add container, and in the Standard subsection, add a container named install-oneagent, set the image to Alpine version 3.8+ ("alpine:3"), and select the memory limits.

There are two types of memory limits: soft and hard. ECS requires that you define the limit for at least one type of memory. We recommend using the default setting (soft limit of 128 MiBs), as it's less restrictive, but you can adjust it as needed.
Scroll to Environment and do the following:
- Uncheck the Essential parameter.
- In the Entry point field, enter /bin/sh,-c.
- In the Command field, enter ARCHIVE=$(mktemp) && wget -O $ARCHIVE "$DT_API_URL/v1/deployment/installer/agent/unix/paas/latest?Api-Token=$DT_PAAS_TOKEN&$DT_ONEAGENT_OPTIONS" && unzip -o -d /opt/dynatrace/oneagent $ARCHIVE && rm -f $ARCHIVE.
In the Environment variables subsection, define:
- DT_API_URL - this is the API URL for your Dynatrace environment.
  - For SaaS: https://<your-environment-id>.live.dynatrace.com/api
  - For Managed: https://<cluster>/e/<your-environment-id>/api
  - For ActiveGate: https://<your-active-gate-IP-or-hostname>:9999/e/<your-environment-id>/api.
- DT_ONEAGENT_OPTIONS- this is the flavor (valid options are default or musl for Alpine images) and the technology (code module).
  - Syntax for default is flavor=default&include=all.
  - Syntax for musl is flavor=musl&include=all.
- DT_PAAS_TOKEN - this is your PaaS token to download the OneAgent code modules.
Scroll to Storage and logging to define the mount point with the source volume oneagent and the container path /opt/dynatrace/oneagent.
Click Add to create the container definition.
Choose Add container again, this time to define your application, and complete the fields in the Standard subsection according to your application requirements.
Scroll to Environment, and in Environment variable, define LD_PRELOAD with the value /opt/dynatrace/oneagent/agent/lib64/liboneagentproc.so.
Scroll to Startup Dependency Ordering and enter the container name install-oneagent and the condition Complete.
Scroll to Storage and logging to define the mount point with the source volume oneagent and the container path /opt/dynatrace/oneagent.
Select Update to update your container definition.
Deploy the new version of your task definition on your ECS cluster.

Check the Logs tab

For the install-oneagent container, you can see the code modules' ZIP file being downloaded by wget and being unzipped.
For your application workload container, you can see the code module being loaded by the process.

In Dynatrace, your Fargate application workload container will show up in the Hosts section. The instrumented process will show up in Processes as a typical Docker container.

Fargate

The runtime approach requires Fargate version 1.3+. For earlier versions, select the build-time approach.

Configure network zones optional

You can configure network zones as an environment variable:

DT_NETWORK_ZONE: equals your.network.zone

See network zones for more information.

Monitoring consumption

For AWS Fargate, monitoring consumption is based on host units. To learn how host units are calculated for Dynatrace application and infrastructure monitoring, see Application and Infrastructure Monitoring (Host Units).

Troubleshoot

Application image OneAgent integration problems