Linux installation documentation update

docs/running-headscale-linux.md

@@ -24,7 +24,13 @@ configuration (`/etc/headscale/config.yaml`).
 
     ```shell
     HEADSCALE_VERSION="" # See above URL for latest version, e.g. "X.Y.Z" (NOTE: do not add the "v" prefix!)
+    # Or you can use the following bash one liner
+    # HEADSCALE_VERSION="$(curl -v https://github.com/juanfont/headscale/releases/latest 2>&1 |grep location | awk -F'/' '{print $NF}' | sed -e 's/v//' | |tr -d '\r')"
+
     HEADSCALE_ARCH="" # Your system architecture, e.g. "amd64"
+    # Or you can use:
+    # HEADSCALE_ARCH="$(dpkg --print-architecture)"
+
     wget --output-document=headscale.deb \
       "https://github.com/juanfont/headscale/releases/download/v${HEADSCALE_VERSION}/headscale_${HEADSCALE_VERSION}_linux_${HEADSCALE_ARCH}.deb"
     ```
@@ -95,3 +101,107 @@ connect a node to `headscale` during the `tailscale` command:
 ```shell
 tailscale up --login-server <YOUR_HEADSCALE_URL> --authkey <YOUR_AUTH_KEY>
 ```
+
+# Sample config.yml
+
+A sane config.yml might look like this
+
+```yaml
+---
+
+# Remember to punch a hole in your firewall for this port
+server_url: https://headscale.example.com:28000
+
+listen_addr: 0.0.0.0:28000
+
+metrics_listen_addr: 127.0.0.1:9090
+
+grpc_listen_addr: 127.0.0.1:50443
+
+grpc_allow_insecure: false
+
+private_key_path: /var/lib/headscale/private.key
+
+noise:
+  private_key_path: /var/lib/headscale/noise_private.key
+
+ip_prefixes:
+  - fd7a:115c:a1e0::/48
+  - 100.64.0.0/10
+
+derp:
+  server:
+    enabled: false
+
+    region_id: 999
+
+    region_code: "headscale"
+    region_name: "Headscale Embedded DERP"
+
+    stun_listen_addr: "0.0.0.0:3478"
+
+  urls:
+    - https://controlplane.tailscale.com/derpmap/default
+
+  paths: []
+
+  auto_update_enabled: true
+
+  update_frequency: 24h
+
+disable_check_updates: false
+
+ephemeral_node_inactivity_timeout: 30m
+
+node_update_check_interval: 10s
+
+db_type: sqlite3
+
+db_path: /var/lib/headscale/db.sqlite
+
+
+
+acme_url: https://acme-v02.api.letsencrypt.org/directory
+
+acme_email: "contact@example.com"
+
+
+tls_letsencrypt_cache_dir: /var/lib/headscale/cache
+
+tls_letsencrypt_challenge_type: HTTP-01
+tls_letsencrypt_listen: ":http"
+
+# Provisioned via certbot
+tls_cert_path: "/etc/letsencrypt/live/headscale.example.com/fullchain.pem"
+tls_key_path: "/etc/letsencrypt/live/headscale.example.com/privkey.pem"
+
+log:
+  format: text
+  level: info
+
+acl_policy_path: ""
+
+dns_config:
+  override_local_dns: true
+
+  nameservers:
+    - 9.9.9.9
+    - 1.1.1.1
+
+
+
+  domains: []
+
+
+  magic_dns: true
+
+  base_domain: example.com
+
+unix_socket: /var/run/headscale/headscale.sock
+unix_socket_permission: "0770"
+
+logtail:
+  enabled: false
+
+randomize_client_port: false
+```