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Installing Sematext Agent on Docker

Installing Sematext Agent can be done by using Docker, Docker Compose, and Docker Swarm / Enterprise.

Docker¶

To deploy the Sematext Agent as a container, run the following command on each host:

docker run -d  --restart always --privileged -P --name st-agent \
-v /:/hostfs:ro \
-v /sys/:/hostfs/sys:ro \
-v /var/run/:/var/run/ \
-v /sys/kernel/debug:/sys/kernel/debug \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
-e INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE> \
-e REGION=<US or EU> \
sematext/agent:latest

Read more about why Sematext Agent needs access to host files and directories.

Besides providing several bind mounts for Docker socket, procfs and journal directory, App tokens are required to ship data to the appropriate Monitoring Apps. Sematext Agent will gather data about running processes on the system, basic operating system metrics, machine/instance-related information, and ship it to the Infra App token. It will also detect active containers and start collecting different container metrics such as memory usage, network I/O statistics, disk throughput, etc.

By default, the US region receiver endpoints are used to ship data to Sematext Cloud. You can override receiver addresses by either passing SERVER_BASE_URL for metrics receivers, LOGS_RECEIVER_URL and EVENTS_RECEIVER_URL for log and event receivers respectively, or specify an alternative (EU) region via the REGION environment variable.

Note that if any of the *_URL environment variables are set, region-specific receiver endpoints are ignored.

Updating/Upgrading Sematext Agent on Docker¶

To update or upgrade the Sematext Agent to the latest version, you can pull the latest image and recreate the container:

docker pull sematext/agent:latest
docker rm -f st-agent
docker run -d  --restart always --privileged -P --name st-agent \
-v /:/hostfs:ro \
-v /sys/:/hostfs/sys:ro \
-v /var/run/:/var/run/ \
-v /sys/kernel/debug:/sys/kernel/debug \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
-e INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE> \
-e REGION=<US or EU> \
sematext/agent:latest

Uninstalling Sematext Agent on Docker¶

To remove the Sematext Agent container from a Docker host, run the following command:

docker ps -a --format '{{.Names}}' | grep -E "sematext-agent|st-agent" | xargs -r docker rm -f

This command will find and force-remove any containers named sematext-agent or st-agent from the host.

Docker for OSX¶

To deploy the Sematext Agent on Docker for OSX, run the following command:

docker run -d  --restart always --privileged -P --name st-agent \
-v /:/hostfs:ro \
-v /sys/:/hostfs/sys:ro \
-v /var/run/:/var/run/ \
-v /sys/kernel/debug:/sys/kernel/debug \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
-v /var/run/docker.sock:/var/run/docker.sock:ro \
-e INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE> \
-e REGION=<US or EU> \
sematext/agent:latest

Docker on OSX relies on virtualization capabilities to spawn the containers inside the VM. The side effect is that Sematext Agent will report the OS metrics of the VM box and not the bare-metal machine where OSX is running.

Updating/Upgrading Sematext Agent on Docker for OSX¶

To update the Sematext Agent on Docker for OSX, follow the same steps as for Docker:

docker pull sematext/agent:latest
docker rm -f st-agent
docker run -d  --restart always --privileged -P --name st-agent \
-v /:/hostfs:ro \
-v /sys/:/hostfs/sys:ro \
-v /var/run/:/var/run/ \
-v /sys/kernel/debug:/sys/kernel/debug \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
-v /var/run/docker.sock:/var/run/docker.sock:ro \
-e INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE> \
-e REGION=<US or EU> \
sematext/agent:latest

Uninstalling Sematext Agent on Docker for OSX¶

To remove the Sematext Agent container on Docker for OSX, use the following command:

docker ps -a --format '{{.Names}}' | grep -E "sematext-agent|st-agent" | xargs -r docker rm -f

Run Sematext Agent with a Config File¶

Mount the configuration file into the container and set the path to the configuration file -v /opt/st-agent/st-agent.yml:/opt/st-agent/st-agent.yml via CONFIG_FILE environment variable.

$ docker run -d  --restart always --privileged -P --name st-agent \
-v /:/hostfs:ro \
-v /sys/:/hostfs/sys:ro \
-v /var/run/:/var/run/ \
-v /sys/kernel/debug:/sys/kernel/debug \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
-v /dev:/hostfs/dev:ro \
-e INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE> \
-e REGION=<US or EU> \
sematext/agent:latest

Docker Compose¶

For the deployments that are orchestrated by Docker Compose, you can use the following manifest:

# docker-compose.yml
version: '3'
services:
  sematext-agent:
    image: 'sematext/agent:latest'
    environment:
      - affinity:container!=*sematext-agent*
      - INFRA_TOKEN=<YOUR_INFRA_APP_TOKEN_HERE>
      - REGION=<US or EU>
      - LOGGING_WRITE_EVENTS=false
      - LOGGING_REQUEST_TRACKING=false
      - LOGGING_LEVEL=info
      - NODE_NAME=$HOSTNAME
      - CONTAINER_SKIP_BY_IMAGE=sematext
    cap_add:
      - SYS_ADMIN
    restart: always
    volumes:
      - '/:/hostfs:ro'
      - '/etc/passwd:/etc/passwd:ro'
      - '/etc/group:/etc/group:ro'
      - '/var/run/:/var/run/'
      - '/sys/kernel/debug:/sys/kernel/debug'
      - '/sys:/host/sys:ro'
      - '/dev:/hostfs/dev:ro'

Updating/Upgrading Sematext Agent using Docker Compose¶

To update the Sematext Agent using Docker Compose, follow these steps:

docker-compose pull sematext-agent
docker-compose down
docker-compose up -d

This process will pull the latest version of the agent, stop the current container, and start the updated version.

Uninstalling Sematext Agent using Docker Compose¶

To remove the Sematext Agent using Docker Compose, run:

docker-compose down

This will stop and remove the Sematext Agent container managed by Docker Compose.

Docker Swarm / Enterprise¶

Create an Infra Monitoring App in Sematext and follow the Docker Swarm instructions in the UI.

The following docker-compose.yml file provides a working configuration that can be used with docker stack. However, for convenience, a version pre-filled with INFRA_TOKEN and REGION can be found in the installation instructions in the UI.

# docker-compose.yml
version: '3'
services:
  sematext-agent:
    image: 'sematext/agent:latest'
    environment:
      - INFRA_TOKEN: <YOUR_INFRA_APP_TOKEN_HERE>
      - REGION: <US or EU>
    cap_add:
      - SYS_ADMIN
    restart: always
    volumes:
      - '/:/hostfs:ro'
      - '/etc/passwd:/etc/passwd:ro'
      - '/etc/group:/etc/group:ro'
      - '/var/run/:/var/run/'
      - '/sys/kernel/debug:/sys/kernel/debug'
      - '/sys:/host/sys:ro'
      - '/dev:/hostfs/dev:ro'
      - '/var/run/docker.sock:/var/run/docker.sock:ro'
    networks:
      - st-agent-net
networks:
  st-agent-net:
    driver: overlay
    attachable: true

Then you run:

docker stack deploy -c docker-compose.yml <my_app>

Read more about why Sematext Agent needs access to host files and directories.

Updating/Upgrading Sematext Agent on Docker Swarm / Enterprise¶

To update the Sematext Agent on Docker Swarm, follow these steps:

docker service update --image sematext/agent:latest sematext-agent

This command will update the Sematext Agent service to the latest image.

Uninstalling Sematext Agent on Docker Swarm / Enterprise¶

To remove the Sematext Agent deployed via Docker Swarm, run:

docker service rm sematext-agent-docker sematext-agent st-agent
docker network rm st-agent-net

This will remove the Sematext Agent services and network from your Docker Swarm environment.