Running Traefik - HTTP Reverse Proxy and Load Balancer - in Docker

Full steps can be found at https://i12bretro.github.io/tutorials/0758.html

What is Traefik?

Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components [...] and configures itself automatically and dynamically. Pointing Traefik at your orchestrator should be the only configuration step you need. - https://github.com/traefik/traefik

Installing Docker

   01. Log into the Linux based device    02. Run the following commands in the terminal          # install prerequisites          sudo apt install apt-transport-https ca-certificates curl software-properties-common gnupg-agent -y          # add docker gpg key          curl -fsSL https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release)/gpg | sudo apt-key add -          # add docker software repository          sudo add-apt-repository "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/$(awk -F'=' '/^ID=/{ print $NF }' /etc/os-release) $(lsb_release -cs) stable"          # install docker          sudo apt install docker-ce docker-compose containerd.io -y          # enable and start docker service          sudo systemctl enable docker && sudo systemctl start docker          # add the current user to the docker group          sudo usermod -aG docker $USER          # reauthenticate for the new group membership to take effect          su - $USER

Running Traefik

   01. Continue with the following commands in a terminal window          # create a working directory          mkdir ~/docker/traefik -p          # create and edit config file          nano ~/docker/traefik/traefik.yml    02. Paste the following default configuration into traefik.yml, replacing the hostname with the docker host          ## traefik.yml          # Docker configuration backend          providers:          docker:          defaultRule: "Host({{ trimPrefix / .Name }}.≪% dockerhost.fqdn %≫)"          # API and dashboard configuration          api:          insecure: true    03. Press CTRL+O, Enter, CTRL+X to write the changes    04. Continue with the following commands in a terminal window          # start the traefik container          docker run -d --name=traefik -p 8080:8080 -p 80:80 -v ~/docker/traefik/traefik.yml:/etc/traefik/traefik.yml -v /var/run/docker.sock:/var/run/docker.sock traefik    05. Open a web browser and navigate to http://DNSorIP:8080    06. Welcome to the Traefik web dashboard

Dynamic Container Ingress Testing

   01. Continue with the following commands in a terminal window          # start a basic whoami web service          docker run -d --name whoami -p 40001:80 traefik/whoami    02. Back in the web browser, navigate to whoami.≪% docker host %≫    03. The Apache HTTPD server response should be displayed    04. Back in the Traefik dashboard the new whoami HTTP router should display    05. Let's try one more test          # create an apache2 working directory          mkdir ~/docker/apache2/htdocs -p          # create a test html file          echo '≪html≫≪body≫≪h1≫Hello world≪/h1≫≪h3≫Have you subscribed yet?≪/h3≫≪/body≫≪/html≫' ≫ ~/docker/apache2/htdocs/index.html          # start a basic apache httpd server          docker run -d --name httpd -p 40002:80 -v ~/docker/apache2/htdocs:/usr/local/apache2/htdocs/ httpd    06. Back in the web browser, navigate to httpd.≪% docker host %≫    07. The Apache HTTPD server response should be displayed    08. Back in the Traefik dashboard the new httpd HTTP router should display   Documentation:  https://doc.traefik.io/traefik/  

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