deploy_base

This role creates a foundation for the deployment of dockerized web apps by setting up a linux server (including security) and deploying a docker swarm containing monitoring services, an alert manager and a reverse proxy.

Also find it on Ansible Galaxy

One use of this setup is to allow you to deploy multiple apps on one server. This can help you save hosting costs. Traefik will redirect incoming requests to the right docker container. Find an instruction on how to deploy an app to this setup and how to add an automatic deploy function with Github Workflows in this repo.

This docker swarm contains:

• Traefik
• Prometheus
• CAdvisor
• Node Exporter
• Alertmanager
• Grafana

Requirements

A user with posswordless sudo privileges should be set up on the server. Personally I take care of that with a cloud config file. You need to "become" and gather facts for this role to work.

Role Variables

ansible-galaxy install jstet.deploy_base

Role Variables

A user with passwordless sudo privileges that will execute all docker tasks.

user: user

Extra packages you want to install on the server.

packages:
  - htop
  - vim
  - net-tools

Vars needed for setting up Grafana. The password for the user "admin" and the domain on which you want to reach Grafana.

GRAFANA_PW: 1234
MONITORING_DOMAIN: monitoring.localhost

The email used for administering a certificate with letsencrypt.

LETSENCRYPT_EMAIL: mail@example.com

SLACK_WEBHOOK: "{{  SLACK_WEBHOOK_VAULT }}"

Dependencies

This role uses jstet.initial_server_setup and geerlingguy.docker. Will be installed automatically with the needed parameters.

Example Playbook

---

- hosts: all
  gather_facts: yes
  become: no
  vars_files:
    - vars/vault.yml
  roles:
    - role: deploy_base
      vars:
          packages: 
              - htop
              - vim
              - net-tools
          user: user
          GRAFANA_PW: "{{ GRAFANA_PW_VAULT }}"
          LETSENCRYPT_EMAIL: example@mail,de
          MONITORING_DOMAIN: data.example.net
          TRAEFIK_USER: admin
  tasks:

License

MIT

Author Information

jstet.net

Sources

iptables and docker

• https://github.com/chaifeng/ufw-docker#solving-ufw-and-docker-issues

Prometheus

Node exporter

• https://prometheus.io/docs/guides/node-exporter/

Docker and Prometheus

• https://schroederdennis.de/allgemein/prometheus-mit-docker-installieren-und-einrichten-anleitung/
• https://github.com/vegasbrianc/prometheus/blob/master/docker-compose.yml
• https://prometheus.io/docs/guides/cadvisor/
• https://logz.io/blog/prometheus-tutorial-docker-monitoring/#systemdocker

Grafana

• https://www.howtogeek.com/devops/how-to-run-grafana-in-a-docker-container/

nginx-exporter

• https://github.com/nginxinc/nginx-prometheus-exporter/issues/30

promtail and loki

• https://blog.lrvt.de/log-visualization-with-grafana-loki-promtail/

Traefik

• https://goneuland.de/traefik-v2-reverse-proxy-fuer-docker-unter-debian-10-einrichten/

Docker Swarm

• https://gabrieltanner.org/blog/docker-swarm/
• https://dockerswarm.rocks/
• https://github.com/vegasbrianc/docker-traefik-prometheus

Alertmanager

• https://github.com/vegasbrianc/prometheus
• https://medium.com/techno101/how-to-send-a-mail-using-prometheus-alertmanager-7e880a3676db
• https://api.slack.com/messaging/webhooks
• https://prometheus.io/docs/alerting/latest/configuration/#configuration-file
• https://grafana.com/blog/2020/02/25/step-by-step-guide-to-setting-up-prometheus-alertmanager-with-slack-pagerduty-and-gmail/

Plausible

• https://plausible.io/docs/self-hosting

Misc

Testing alertmanager

docker service create --replicas 1 --name test --network=monitoring alpine/curl:3.14
docker exec -it .... sh
curl -H 'Content-Type: application/json' -d '[{"labels":{"alertname":"hallo hallo"}}]' http://alertmanager:9093/api/v1/alerts