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[Bug] no IPv4 or IPv6 prefix configured, minimum one prefix is required #1078

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opened 2025-12-29 02:28:09 +01:00 by adam · 2 comments
adam commented 2025-12-29 02:28:09 +01:00
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Originally created by @t0msk on GitHub (Aug 6, 2025).

Is this a support request?

  • This is not a support request

Is there an existing issue for this?

  • I have searched the existing issues

Current Behavior

I found bug, I have prefixes correctly set and I still get:

2025-08-06T07:55:57Z FTL home/runner/work/headscale/headscale/cmd/headscale/cli/serve.go:24 > Error initializing error="loading configuration: no IPv4 or IPv6 prefix configured, minimum one prefix is required"

It runs in Docker.

My config.yaml:

---
# headscale will look for a configuration file named `config.yaml` (or `config.json`) in the following order:
#
# - `/etc/headscale`
# - `~/.headscale`
# - current working directory

# The url clients will connect to.
# Typically this will be a domain like:
#
# https://myheadscale.example.com:443
#
server_url: https://headscale.internal

# Address to listen to / bind to on the server
#
# For production:
#listen_addr: 0.0.0.0:8080
# listen_addr: 127.0.0.1:8080

# Address to listen to /metrics, you may want
# to keep this endpoint private to your internal
# network
#
metrics_listen_addr: 127.0.0.1:9090

# Address to listen for gRPC.
# gRPC is used for controlling a headscale server
# remotely with the CLI
# Note: Remote access _only_ works if you have
# valid certificates.
#
# For production:
#grpc_listen_addr: 0.0.0.0:50443
grpc_listen_addr: 127.0.0.1:50443

# Allow the gRPC admin interface to run in INSECURE
# mode. This is not recommended as the traffic will
# be unencrypted. Only enable if you know what you
# are doing.
grpc_allow_insecure: false

# Private key used to encrypt the traffic between headscale
# and Tailscale clients.
# The private key file will be autogenerated if it's missing.
#
private_key_path: /var/lib/headscale/private.key

# The Noise section includes specific configuration for the
# TS2021 Noise protocol
noise:
  # The Noise private key is used to encrypt the
  # traffic between headscale and Tailscale clients when
  # using the new Noise-based protocol. It must be different
  # from the legacy private key.
  private_key_path: /etc/headscale/private.key

# List of IP prefixes to allocate tailaddresses from.
# Each prefix consists of either an IPv4 or IPv6 address,
# and the associated prefix length, delimited by a slash.
# It must be within IP ranges supported by the Tailscale
# client - i.e., subnets of 100.64.0.0/10 and fd7a:115c:a1e0::/48.
# See below:
# IPv6: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#LL81C52-L81C71
# IPv4: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#L33
# Any other range is NOT supported, and it will cause unexpected issues.
ip_prefixes:
  v4: 100.64.0.0/10 # you can change this value to any private ip range you want.
  v6: fd7a:115c:a1e0::/48

# DERP is a relay system that Tailscale uses when a direct
# connection cannot be established.
# https://tailscale.com/blog/how-tailscale-works/#encrypted-tcp-relays-derp
#
# headscale needs a list of DERP servers that can be presented
# to the clients.
derp:
  server:
    # If enabled, runs the embedded DERP server and merges it into the rest of the DERP config
    # The Headscale server_url defined above MUST be using https, DERP requires TLS to be in place
    enabled: false

    # Region ID to use for the embedded DERP server.
    # The local DERP prevails if the region ID collides with other region ID coming from
    # the regular DERP config.
    region_id: 999

    # Region code and name are displayed in the Tailscale UI to identify a DERP region
    region_code: "headscale"
    region_name: "Headscale Embedded DERP"

    # Listens over UDP at the configured address for STUN connections - to help with NAT traversal.
    # When the embedded DERP server is enabled stun_listen_addr MUST be defined.
    #
    # For more details on how this works, check this great article: https://tailscale.com/blog/how-tailscale-works/
    stun_listen_addr: "0.0.0.0:3478"

  # List of externally available DERP maps encoded in JSON
  urls:
    - https://controlplane.tailscale.com/derpmap/default

  # Locally available DERP map files encoded in YAML
  #
  # This option is mostly interesting for people hosting
  # their own DERP servers:
  # https://tailscale.com/kb/1118/custom-derp-servers/
  #
  # paths:
  #   - /etc/headscale/derp-example.yaml
  paths: []

  # If enabled, a worker will be set up to periodically
  # refresh the given sources and update the derpmap
  # will be set up.
  auto_update_enabled: true

  # How often should we check for DERP updates?
  update_frequency: 24h

# Disables the automatic check for headscale updates on startup
disable_check_updates: true

# Time before an inactive ephemeral node is deleted?
ephemeral_node_inactivity_timeout: 30m

# Period to check for node updates within the tailnet. A value too low will severely affect
# CPU consumption of Headscale. A value too high (over 60s) will cause problems
# for the nodes, as they won't get updates or keep alive messages frequently enough.
# In case of doubts, do not touch the default 10s.
node_update_check_interval: 10s

# SQLite config
db_type: sqlite3

# For production:
db_path: /var/lib/headscale/db.sqlite

# # Postgres config
# If using a Unix socket to connect to Postgres, set the socket path in the 'host' field and leave 'port' blank.
# db_type: postgres
# db_host: localhost
# db_port: 5432
# db_name: headscale
# db_user: foo
# db_pass: bar

# If other 'sslmode' is required instead of 'require(true)' and 'disabled(false)', set the 'sslmode' you need
# in the 'db_ssl' field. Refers to https://www.postgresql.org/docs/current/libpq-ssl.html Table 34.1.
# db_ssl: false

### TLS configuration
#
## Let's encrypt / ACME
#
# headscale supports automatically requesting and setting up
# TLS for a domain with Let's Encrypt.
#
# URL to ACME directory
acme_url: https://acme-v02.api.letsencrypt.org/directory

# Email to register with ACME provider
acme_email: ""

# Domain name to request a TLS certificate for:
tls_letsencrypt_hostname: ""

# Path to store certificates and metadata needed by
# letsencrypt
# For production:
tls_letsencrypt_cache_dir: /var/lib/headscale/cache

# Type of ACME challenge to use, currently supported types:
# HTTP-01 or TLS-ALPN-01
# See [docs/tls.md](docs/tls.md) for more information
tls_letsencrypt_challenge_type: HTTP-01
# When HTTP-01 challenge is chosen, letsencrypt must set up a
# verification endpoint, and it will be listening on:
# :http = port 80
tls_letsencrypt_listen: ":http"

## Use already defined certificates:
tls_cert_path: ""
tls_key_path: ""

log:
  # Output formatting for logs: text or json
  format: text
  level: info

# Path to a file containg ACL policies.
# ACLs can be defined as YAML or HUJSON.
# https://tailscale.com/kb/1018/acls/
policy:
  path: ""

## DNS
#
# headscale supports Tailscale's DNS configuration and MagicDNS.
# Please have a look to their KB to better understand the concepts:
#
# - https://tailscale.com/kb/1054/dns/
# - https://tailscale.com/kb/1081/magicdns/
# - https://tailscale.com/blog/2021-09-private-dns-with-magicdns/
#
dns:
  # Whether to prefer using Headscale provided DNS or use local.
  override_local_dns: true

  # List of DNS servers to expose to clients.
  nameservers:
    global:
      - 1.1.1.1
      - 8.8.8.8

  # NextDNS (see https://tailscale.com/kb/1218/nextdns/).
  # "abc123" is example NextDNS ID, replace with yours.
  #
  # With metadata sharing:
  # nameservers:
  #   - https://dns.nextdns.io/abc123
  #
  # Without metadata sharing:
  # nameservers:
  #   - 2a07:a8c0::ab:c123
  #   - 2a07:a8c1::ab:c123

  # Split DNS (see https://tailscale.com/kb/1054/dns/),
  # list of search domains and the DNS to query for each one.
  #
  # restricted_nameservers:
  #   foo.bar.com:
  #     - 1.1.1.1
  #   darp.headscale.net:
  #     - 1.1.1.1
  #     - 8.8.8.8

  # Search domains to inject.
  domains: []

  # Extra DNS records
  # so far only A-records are supported (on the tailscale side)
  # See https://github.com/juanfont/headscale/blob/main/docs/dns-records.md#Limitations
  # extra_records:
  #   - name: "grafana.myvpn.example.com"
  #     type: "A"
  #     value: "100.64.0.3"
  #
  #   # you can also put it in one line
  #   - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.3" }

  # Whether to use [MagicDNS](https://tailscale.com/kb/1081/magicdns/).
  # Only works if there is at least a nameserver defined.
  magic_dns: true

  # Defines the base domain to create the hostnames for MagicDNS.
  # `base_domain` must be a FQDNs, without the trailing dot.
  # The FQDN of the hosts will be
  # `hostname.user.base_domain` (e.g., _myhost.myuser.example.com_).
  base_domain: headscale.internal

# Unix socket used for the CLI to connect without authentication
# Note: for production you will want to set this to something like:
unix_socket: /run/headscale/headscale.sock
unix_socket_permission: "0770"
#
# headscale supports experimental OpenID connect support,
# it is still being tested and might have some bugs, please
# help us test it.
# OpenID Connect
# oidc:
#   only_start_if_oidc_is_available: true
#   issuer: "https://your-oidc.issuer.com/path"
#   client_id: "your-oidc-client-id"
#   client_secret: "your-oidc-client-secret"
#   # Alternatively, set `client_secret_path` to read the secret from the file.
#   # It resolves environment variables, making integration to systemd's
#   # `LoadCredential` straightforward:
#   client_secret_path: "${CREDENTIALS_DIRECTORY}/oidc_client_secret"
#   # client_secret and client_secret_path are mutually exclusive.
#
#   # The amount of time from a node is authenticated with OpenID until it
#   # expires and needs to reauthenticate.
#   # Setting the value to "0" will mean no expiry.
#   expiry: 180d
#
#   # Use the expiry from the token received from OpenID when the user logged
#   # in, this will typically lead to frequent need to reauthenticate and should
#   # only been enabled if you know what you are doing.
#   # Note: enabling this will cause `oidc.expiry` to be ignored.
#   use_expiry_from_token: false
#
#   # Customize the scopes used in the OIDC flow, defaults to "openid", "profile" and "email" and add custom query
#   # parameters to the Authorize Endpoint request. Scopes default to "openid", "profile" and "email".
#
#   scope: ["openid", "profile", "email", "custom"]
#   extra_params:
#     domain_hint: example.com
#
#   # List allowed principal domains and/or users. If an authenticated user's domain is not in this list, the
#   # authentication request will be rejected.
#
#   allowed_domains:
#     - example.com
#   # Note: Groups from keycloak have a leading '/'
#   allowed_groups:
#     - /headscale
#   allowed_users:
#     - alice@example.com
#
#   # If `strip_email_domain` is set to `true`, the domain part of the username email address will be removed.
#   # This will transform `first-name.last-name@example.com` to the user `first-name.last-name`
#   # If `strip_email_domain` is set to `false` the domain part will NOT be removed resulting to the following
#   user: `first-name.last-name.example.com`
#
#   strip_email_domain: true

# Logtail configuration
# Logtail is Tailscales logging and auditing infrastructure, it allows the control panel
# to instruct tailscale nodes to log their activity to a remote server.
logtail:
  # Enable logtail for this headscales clients.
  # As there is currently no support for overriding the log server in headscale, this is
  # disabled by default. Enabling this will make your clients send logs to Tailscale Inc.
  enabled: false

# Enabling this option makes devices prefer a random port for WireGuard traffic over the
# default static port 41641. This option is intended as a workaround for some buggy
# firewall devices. See https://tailscale.com/kb/1181/firewalls/ for more information.
randomize_client_port: false

Expected Behavior

server should start

Steps To Reproduce

copy my config and use latest docker image

Environment

Latest docker image

Runtime environment

  • Headscale is behind a (reverse) proxy
  • Headscale runs in a container

Debug information

I dont have

Originally created by @t0msk on GitHub (Aug 6, 2025). ### Is this a support request? - [x] This is not a support request ### Is there an existing issue for this? - [x] I have searched the existing issues ### Current Behavior I found bug, I have prefixes correctly set and I still get: `2025-08-06T07:55:57Z FTL home/runner/work/headscale/headscale/cmd/headscale/cli/serve.go:24 > Error initializing error="loading configuration: no IPv4 or IPv6 prefix configured, minimum one prefix is required"` It runs in Docker. My config.yaml: ``` --- # headscale will look for a configuration file named `config.yaml` (or `config.json`) in the following order: # # - `/etc/headscale` # - `~/.headscale` # - current working directory # The url clients will connect to. # Typically this will be a domain like: # # https://myheadscale.example.com:443 # server_url: https://headscale.internal # Address to listen to / bind to on the server # # For production: #listen_addr: 0.0.0.0:8080 # listen_addr: 127.0.0.1:8080 # Address to listen to /metrics, you may want # to keep this endpoint private to your internal # network # metrics_listen_addr: 127.0.0.1:9090 # Address to listen for gRPC. # gRPC is used for controlling a headscale server # remotely with the CLI # Note: Remote access _only_ works if you have # valid certificates. # # For production: #grpc_listen_addr: 0.0.0.0:50443 grpc_listen_addr: 127.0.0.1:50443 # Allow the gRPC admin interface to run in INSECURE # mode. This is not recommended as the traffic will # be unencrypted. Only enable if you know what you # are doing. grpc_allow_insecure: false # Private key used to encrypt the traffic between headscale # and Tailscale clients. # The private key file will be autogenerated if it's missing. # private_key_path: /var/lib/headscale/private.key # The Noise section includes specific configuration for the # TS2021 Noise protocol noise: # The Noise private key is used to encrypt the # traffic between headscale and Tailscale clients when # using the new Noise-based protocol. It must be different # from the legacy private key. private_key_path: /etc/headscale/private.key # List of IP prefixes to allocate tailaddresses from. # Each prefix consists of either an IPv4 or IPv6 address, # and the associated prefix length, delimited by a slash. # It must be within IP ranges supported by the Tailscale # client - i.e., subnets of 100.64.0.0/10 and fd7a:115c:a1e0::/48. # See below: # IPv6: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#LL81C52-L81C71 # IPv4: https://github.com/tailscale/tailscale/blob/22ebb25e833264f58d7c3f534a8b166894a89536/net/tsaddr/tsaddr.go#L33 # Any other range is NOT supported, and it will cause unexpected issues. ip_prefixes: v4: 100.64.0.0/10 # you can change this value to any private ip range you want. v6: fd7a:115c:a1e0::/48 # DERP is a relay system that Tailscale uses when a direct # connection cannot be established. # https://tailscale.com/blog/how-tailscale-works/#encrypted-tcp-relays-derp # # headscale needs a list of DERP servers that can be presented # to the clients. derp: server: # If enabled, runs the embedded DERP server and merges it into the rest of the DERP config # The Headscale server_url defined above MUST be using https, DERP requires TLS to be in place enabled: false # Region ID to use for the embedded DERP server. # The local DERP prevails if the region ID collides with other region ID coming from # the regular DERP config. region_id: 999 # Region code and name are displayed in the Tailscale UI to identify a DERP region region_code: "headscale" region_name: "Headscale Embedded DERP" # Listens over UDP at the configured address for STUN connections - to help with NAT traversal. # When the embedded DERP server is enabled stun_listen_addr MUST be defined. # # For more details on how this works, check this great article: https://tailscale.com/blog/how-tailscale-works/ stun_listen_addr: "0.0.0.0:3478" # List of externally available DERP maps encoded in JSON urls: - https://controlplane.tailscale.com/derpmap/default # Locally available DERP map files encoded in YAML # # This option is mostly interesting for people hosting # their own DERP servers: # https://tailscale.com/kb/1118/custom-derp-servers/ # # paths: # - /etc/headscale/derp-example.yaml paths: [] # If enabled, a worker will be set up to periodically # refresh the given sources and update the derpmap # will be set up. auto_update_enabled: true # How often should we check for DERP updates? update_frequency: 24h # Disables the automatic check for headscale updates on startup disable_check_updates: true # Time before an inactive ephemeral node is deleted? ephemeral_node_inactivity_timeout: 30m # Period to check for node updates within the tailnet. A value too low will severely affect # CPU consumption of Headscale. A value too high (over 60s) will cause problems # for the nodes, as they won't get updates or keep alive messages frequently enough. # In case of doubts, do not touch the default 10s. node_update_check_interval: 10s # SQLite config db_type: sqlite3 # For production: db_path: /var/lib/headscale/db.sqlite # # Postgres config # If using a Unix socket to connect to Postgres, set the socket path in the 'host' field and leave 'port' blank. # db_type: postgres # db_host: localhost # db_port: 5432 # db_name: headscale # db_user: foo # db_pass: bar # If other 'sslmode' is required instead of 'require(true)' and 'disabled(false)', set the 'sslmode' you need # in the 'db_ssl' field. Refers to https://www.postgresql.org/docs/current/libpq-ssl.html Table 34.1. # db_ssl: false ### TLS configuration # ## Let's encrypt / ACME # # headscale supports automatically requesting and setting up # TLS for a domain with Let's Encrypt. # # URL to ACME directory acme_url: https://acme-v02.api.letsencrypt.org/directory # Email to register with ACME provider acme_email: "" # Domain name to request a TLS certificate for: tls_letsencrypt_hostname: "" # Path to store certificates and metadata needed by # letsencrypt # For production: tls_letsencrypt_cache_dir: /var/lib/headscale/cache # Type of ACME challenge to use, currently supported types: # HTTP-01 or TLS-ALPN-01 # See [docs/tls.md](docs/tls.md) for more information tls_letsencrypt_challenge_type: HTTP-01 # When HTTP-01 challenge is chosen, letsencrypt must set up a # verification endpoint, and it will be listening on: # :http = port 80 tls_letsencrypt_listen: ":http" ## Use already defined certificates: tls_cert_path: "" tls_key_path: "" log: # Output formatting for logs: text or json format: text level: info # Path to a file containg ACL policies. # ACLs can be defined as YAML or HUJSON. # https://tailscale.com/kb/1018/acls/ policy: path: "" ## DNS # # headscale supports Tailscale's DNS configuration and MagicDNS. # Please have a look to their KB to better understand the concepts: # # - https://tailscale.com/kb/1054/dns/ # - https://tailscale.com/kb/1081/magicdns/ # - https://tailscale.com/blog/2021-09-private-dns-with-magicdns/ # dns: # Whether to prefer using Headscale provided DNS or use local. override_local_dns: true # List of DNS servers to expose to clients. nameservers: global: - 1.1.1.1 - 8.8.8.8 # NextDNS (see https://tailscale.com/kb/1218/nextdns/). # "abc123" is example NextDNS ID, replace with yours. # # With metadata sharing: # nameservers: # - https://dns.nextdns.io/abc123 # # Without metadata sharing: # nameservers: # - 2a07:a8c0::ab:c123 # - 2a07:a8c1::ab:c123 # Split DNS (see https://tailscale.com/kb/1054/dns/), # list of search domains and the DNS to query for each one. # # restricted_nameservers: # foo.bar.com: # - 1.1.1.1 # darp.headscale.net: # - 1.1.1.1 # - 8.8.8.8 # Search domains to inject. domains: [] # Extra DNS records # so far only A-records are supported (on the tailscale side) # See https://github.com/juanfont/headscale/blob/main/docs/dns-records.md#Limitations # extra_records: # - name: "grafana.myvpn.example.com" # type: "A" # value: "100.64.0.3" # # # you can also put it in one line # - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.3" } # Whether to use [MagicDNS](https://tailscale.com/kb/1081/magicdns/). # Only works if there is at least a nameserver defined. magic_dns: true # Defines the base domain to create the hostnames for MagicDNS. # `base_domain` must be a FQDNs, without the trailing dot. # The FQDN of the hosts will be # `hostname.user.base_domain` (e.g., _myhost.myuser.example.com_). base_domain: headscale.internal # Unix socket used for the CLI to connect without authentication # Note: for production you will want to set this to something like: unix_socket: /run/headscale/headscale.sock unix_socket_permission: "0770" # # headscale supports experimental OpenID connect support, # it is still being tested and might have some bugs, please # help us test it. # OpenID Connect # oidc: # only_start_if_oidc_is_available: true # issuer: "https://your-oidc.issuer.com/path" # client_id: "your-oidc-client-id" # client_secret: "your-oidc-client-secret" # # Alternatively, set `client_secret_path` to read the secret from the file. # # It resolves environment variables, making integration to systemd's # # `LoadCredential` straightforward: # client_secret_path: "${CREDENTIALS_DIRECTORY}/oidc_client_secret" # # client_secret and client_secret_path are mutually exclusive. # # # The amount of time from a node is authenticated with OpenID until it # # expires and needs to reauthenticate. # # Setting the value to "0" will mean no expiry. # expiry: 180d # # # Use the expiry from the token received from OpenID when the user logged # # in, this will typically lead to frequent need to reauthenticate and should # # only been enabled if you know what you are doing. # # Note: enabling this will cause `oidc.expiry` to be ignored. # use_expiry_from_token: false # # # Customize the scopes used in the OIDC flow, defaults to "openid", "profile" and "email" and add custom query # # parameters to the Authorize Endpoint request. Scopes default to "openid", "profile" and "email". # # scope: ["openid", "profile", "email", "custom"] # extra_params: # domain_hint: example.com # # # List allowed principal domains and/or users. If an authenticated user's domain is not in this list, the # # authentication request will be rejected. # # allowed_domains: # - example.com # # Note: Groups from keycloak have a leading '/' # allowed_groups: # - /headscale # allowed_users: # - alice@example.com # # # If `strip_email_domain` is set to `true`, the domain part of the username email address will be removed. # # This will transform `first-name.last-name@example.com` to the user `first-name.last-name` # # If `strip_email_domain` is set to `false` the domain part will NOT be removed resulting to the following # user: `first-name.last-name.example.com` # # strip_email_domain: true # Logtail configuration # Logtail is Tailscales logging and auditing infrastructure, it allows the control panel # to instruct tailscale nodes to log their activity to a remote server. logtail: # Enable logtail for this headscales clients. # As there is currently no support for overriding the log server in headscale, this is # disabled by default. Enabling this will make your clients send logs to Tailscale Inc. enabled: false # Enabling this option makes devices prefer a random port for WireGuard traffic over the # default static port 41641. This option is intended as a workaround for some buggy # firewall devices. See https://tailscale.com/kb/1181/firewalls/ for more information. randomize_client_port: false ``` ### Expected Behavior server should start ### Steps To Reproduce copy my config and use latest docker image ### Environment ```markdown Latest docker image ``` ### Runtime environment - [ ] Headscale is behind a (reverse) proxy - [x] Headscale runs in a container ### Debug information I dont have
adam added the bug label 2025-12-29 02:28:09 +01:00
adam closed this issue 2025-12-29 02:28:09 +01:00
adam commented 2025-12-29 02:28:09 +01:00
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@sanupat commented on GitHub (Aug 6, 2025):

As this example. https://github.com/juanfont/headscale/blob/main/config-example.yaml
It should be prefixes: not ip_prefixes:

and why commented this one?

# Address to listen to / bind to on the server
#
# For production:
#listen_addr: 0.0.0.0:8080
# listen_addr: 127.0.0.1:8080
@sanupat commented on GitHub (Aug 6, 2025): As this example. https://github.com/juanfont/headscale/blob/main/config-example.yaml It should be `prefixes:` not `ip_prefixes:` and why commented this one? ``` # Address to listen to / bind to on the server # # For production: #listen_addr: 0.0.0.0:8080 # listen_addr: 127.0.0.1:8080 ```
adam commented 2025-12-29 02:28:09 +01:00
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@nblock commented on GitHub (Aug 7, 2025):

This configuration value was renamed with Headscale 0.23.0.

Please use a configuration that matches your running Headscale version. You can do so be selecting the same tag in GitHub's version dropdown. Here is the link for Headscale 0.26.1: https://github.com/juanfont/headscale/blob/v0.26.1/config-example.yaml

@nblock commented on GitHub (Aug 7, 2025): This configuration value was renamed with Headscale 0.23.0. Please use a configuration that matches your running Headscale version. You can do so be selecting the same tag in GitHub's version dropdown. Here is the link for Headscale 0.26.1: https://github.com/juanfont/headscale/blob/v0.26.1/config-example.yaml
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Reference: starred/headscale#1078
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?