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diff --git a/content/blog/tailscale-docker-https.org b/content/blog/tailscale-docker-https.org new file mode 100644 index 0000000..14e4cf1 --- /dev/null +++ b/content/blog/tailscale-docker-https.org @@ -0,0 +1,121 @@ +#+TITLE: Tailscale, Docker and HTTPS +#+TAGS[]: docker tailscale traefik +#+DATE: <2021-12-29 Wed> + +I run a number of services in my home network. For the majority of these services, I don't want to make them available on the internet, I want to only be able to access them when I'm on my home network. However, sometimes I'm not at home and I still want to access them. So far I've been using plain [[https://www.wireguard.com/][wireguard]] to achieve this. While the initial configuration for wireguard is pretty simple, it starts to be a bit more cumbersome as I add more hosts/containers. It's also not easy to share keys with other folks if I want to give access to some of the machines or services. For that reason I decided to give a look at [[https://tailscale.com/][tailscale]]. + +There's already a lot of articles about tailscale and how to use and configure it. Their [[https://tailscale.com/kb/][documentation]] is also pretty good, so I won't cover the initial setup. + +As stated above, I want to access some of my services that are running as docker containers from anywhere. For web services, I want to use them through HTTPS, with a valid certificate, and without having to remember on which port the service it's listening. I also don't want to setup a PKI in my home lab for that (and I'm also not interested in configuring split DNS), and instead I prefer to use [[https://letsencrypt.org/][let's encrypt]] with a proper subdomain that is unique for each service. + +The [[https://tailscale.com/kb/1054/dns/][tailscale documentation]] has two suggestions for this: +- use their magicDNS feature / split DNS +- setup a subdomain on a public domain + +Since I already have a public domain that I use for my home network, I decided to go with the second option (I'm also uncertain how to achieve my goal using magicDNS without running tailscale inside the container). + +The public domain I'm using is managed through [[https://cloud.google.com/dns/docs/tutorials/create-domain-tutorial][Google Cloud Domain]]. I create a new record for the services I want to run (for example, ~dash~ for my instance of grafana), using the IP address from the tailscale node the service runs on (e.g. 100.83.51.12). + +For routing the traffic I use [[https://traefik.io/][traefik]]. The configuration for traefik looks like this: +#+begin_src yaml +global: + sendAnonymousUsage: false +providers: + docker: + exposedByDefault: false +entryPoints: + http: + address: ":80" + https: + address: ":443" +certificatesResolvers: + dash: + acme: + email: franck@fcuny.net + storage: acme.json + dnsChallenge: + provider: gcloud +#+end_src + +The important bit here is the ~certificatesResolvers~ part. I'll be using the [[https://doc.traefik.io/traefik/user-guides/docker-compose/acme-dns/][dnsChallenge]] instead of the [[https://doc.traefik.io/traefik/user-guides/docker-compose/acme-http/][httpChallenge]] to obtain the certificate from let's encrypt. For this to work, I need to specify the ~provider~ to be [[https://go-acme.github.io/lego/dns/gcloud/][gcloud]]. I'll also need a service account (see [[https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application][this doc]] to create it). I run ~traefik~ in a docker container, and the ~systemd~ unit file is below. The required bits for using the ~dnsChallenge~ with ~gcloud~ are: +- the environment variable ~GCP_SERVICE_ACCOUNT_FILE~: it contains the credentials so that ~traefik~ can update the DNS record for the challenge +- the environment variable ~GCP_PROJECT~: the name of the GCP project +- mounting the service account file inside the container (I store it on the host under ~/data/containers/traefik/config/sa.json~) + +#+begin_src systemd +[Unit] +Description=traefik proxy +Documentation=https://doc.traefik.io/traefik/ +After=docker.service +Requires=docker.service + +[Service] +Restart=on-failure +ExecStartPre=-/usr/bin/docker kill traefik +ExecStartPre=-/usr/bin/docker rm traefik +ExecStartPre=/usr/bin/docker pull traefik:latest + +ExecStart=/usr/bin/docker run \ + -p 80:80 \ + -p 9080:8080 \ + -p 443:443 \ + --name=traefik \ + -e GCE_SERVICE_ACCOUNT_FILE=/var/run/gcp-service-account.json \ + -e GCE_PROJECT= gcp-super-project \ + --volume=/data/containers/traefik/config/acme.json:/acme.json \ + --volume=/data/containers/traefik/config/traefik.yml:/etc/traefik/traefik.yml:ro \ + --volume=/data/containers/traefik/config/sa.json:/var/run/gcp-service-account.json \ + --volume=/var/run/docker.sock:/var/run/docker.sock:ro \ + traefik:latest +ExecStop=/usr/bin/docker stop traefik + +[Install] +WantedBy=multi-user.target +#+end_src + +As an example, I run [[https://grafana.com/][grafana]] on my home network to view metrics from the various containers / hosts. Let's pretend I use ~example.net~ as my domain. I want to be able to access ~grafana~ via https://dash.example.net. Here's the ~systemd~ unit configuration I use for this: + +#+begin_src systemd +[Unit] +Description=Grafana in a docker container +Documentation=https://grafana.com/docs/ +After=docker.service +Requires=docker.service + +[Service] +Restart=on-failure +RuntimeDirectory=grafana +ExecStartPre=-/usr/bin/docker kill grafana-server +ExecStartPre=-/usr/bin/docker rm grafana-server +ExecStartPre=-/usr/bin/docker pull grafana/grafana:latest + +ExecStart=/usr/bin/docker run \ + -p 3000:3000 \ + -e TZ='America/Los_Angeles' \ + --name grafana-server \ + -v /data/containers/grafana/etc/grafana:/etc/grafana \ + -v /data/containers/grafana/var/lib/grafana:/var/lib/grafana \ + -v /data/containers/grafana/var/log/grafana:/var/log/grafana \ + --user=grafana \ + --label traefik.enable=true \ + --label traefik.http.middlewares.grafana-https-redirect.redirectscheme.scheme=https \ + --label traefik.http.middlewares.grafana-https-redirect.redirectscheme.permanent=true \ + --label traefik.http.routers.grafana-http.rule=Host(`dash.example.net`) \ + --label traefik.http.routers.grafana-http.entrypoints=http \ + --label traefik.http.routers.grafana-http.service=grafana-svc \ + --label traefik.http.routers.grafana-http.middlewares=grafana-https-redirect \ + --label traefik.http.routers.grafana-https.rule=Host(`dash.example.net`) \ + --label traefik.http.routers.grafana-https.entrypoints=https \ + --label traefik.http.routers.grafana-https.tls=true \ + --label traefik.http.routers.grafana-https.tls.certresolver=dash \ + --label traefik.http.routers.grafana-https.service=grafana-svc \ + --label traefik.http.services.grafana-svc.loadbalancer.server.port=3000 \ + grafana/grafana:latest + +ExecStop=/usr/bin/docker stop unifi-controller + +[Install] +WantedBy=multi-user.target +#+end_src + +Now I can access my grafana instance via HTTPS (and http://dash.example.net would redirect to HTTPS) while my tailscale interface is up on the machine I'm using (e.g. my desktop or my phone). |