Pihole stopped working with "pihole-FTL: no process found" error

[anginear]

I have a pihole installation on docker in macvlan mode running on Ubuntu 20.04. It was running fine but this morning, I am getting the following error. I've not made any changes to the server.

s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service cron: starting
s6-rc: info: service cron successfully started
s6-rc: info: service _uid-gid-changer: starting
s6-rc: info: service _uid-gid-changer successfully started
s6-rc: info: service _startup: starting
  [i] Starting docker specific checks & setup for docker pihole/pihole
  [i] Setting capabilities on pihole-FTL where possible
  [i] Applying the following caps to pihole-FTL:
        * CAP_CHOWN
        * CAP_NET_BIND_SERVICE
        * CAP_NET_RAW
  [i] Ensuring basic configuration by re-running select functions from basic-install.sh

  [i] Installing configs from /etc/.pihole...
  [i] Existing dnsmasq.conf found... it is not a Pi-hole file, leaving alone!
  [✓] Installed /etc/dnsmasq.d/01-pihole.conf
  [✓] Installed /etc/dnsmasq.d/06-rfc6761.conf

  [i] Installing latest logrotate script...
        [i] Existing logrotate file found. No changes made.
  [i] Pre existing WEBPASSWORD found
  [i] Added ENV to php:
                        "TZ" => "America/Chicago",
                        "PIHOLE_DOCKER_TAG" => "",
                        "PHP_ERROR_LOG" => "/var/log/lighttpd/error-pihole.log",
                        "CORS_HOSTS" => "",
                        "VIRTUAL_HOST" => "0.0.0.0",
  [i] Using IPv4 and IPv6
  [i] Preexisting ad list /etc/pihole/adlists.list detected (exiting setup_blocklists early)
  [i] Converting DNS1 to PIHOLE_DNS_
  [i] Setting DNS servers based on PIHOLE_DNS_ variable
  [i] Applying pihole-FTL.conf setting LOCAL_IPV4=0.0.0.0
  [i] FTL binding to default interface: eth0
  [i] Enabling Query Logging
  [i] Testing lighttpd config: Syntax OK
  [i] All config checks passed, cleared for startup ...
  [i] Docker start setup complete

  [i] pihole-FTL (no-daemon) will be started as pihole

s6-rc: info: service _startup successfully started
s6-rc: info: service pihole-FTL: starting
s6-rc: info: service pihole-FTL successfully started
s6-rc: info: service lighttpd: starting
s6-rc: info: service lighttpd successfully started
s6-rc: info: service _postFTL: starting
s6-rc: info: service _postFTL successfully started
  Checking if custom gravity.db is set in /etc/pihole/pihole-FTL.conf
s6-rc: info: service legacy-services: starting
s6-rc: info: service legacy-services successfully started
  [i] Neutrino emissions detected...
  [✓] Pulling blocklist source list into range

  [✓] Preparing new gravity database
  [i] Using libz compression

  [i] Target: https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
  [✓] Status: Retrieval successful
  [i] Analyzed 158531 domains
  [i] List stayed unchanged

  [i] Target: https://mirror1.malwaredomains.com/files/justdomains
  [✗] Status: Not found
  [✗] List download failed: no cached list available

  [i] Target: http://sysctl.org/cameleon/hosts
  [✓] Status: No changes detected
  [i] Analyzed 20562 domains

  [i] Target: https://s3.amazonaws.com/lists.disconnect.me/simple_tracking.txt
  [✓] Status: No changes detected
  [i] Analyzed 2705 domains, 3 domains invalid!
      Sample of invalid domains:
      - # Ad filter list by Disconnect
      - # License: GPLv3
      - # Contact: support [at] disconnect.me

  [i] Target: https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt
  [✓] Status: No changes detected
  [i] Analyzed 2701 domains

  [i] Target: https://hosts-file.net/ad_servers.txt
  [✗] Status: Not found
  [✗] List download failed: no cached list available

  [✓] Creating new gravity databases
  [✓] Storing downloaded domains in new gravity database
  [✓] Building tree
  [✓] Swapping databases
  [✓] The old database remains available.
  [i] Number of gravity domains: 184496 (170516 unique domains)
  [i] Number of exact blacklisted domains: 0
  [i] Number of regex blacklist filters: 0
  [i] Number of exact whitelisted domains: 77
  [i] Number of regex whitelist filters: 2
/bin/bash: line 1:   279 Hangup                  /usr/bin/pihole-FTL no-daemon > /dev/null 2>&1
  [✓] Cleaning up stray matter
Stopping pihole-FTL
pihole-FTL: no process found

  [✓] FTL is listening on port
     [✓] UDP (IPv4)
     [✓] TCP (IPv4)
     [✗] UDP (IPv6)
     [✓] TCP (IPv6)

  [✓] Pi-hole blocking is enabled

  Pi-hole version is v5.14.1 (Latest: v5.14.1)
  AdminLTE version is v5.17 (Latest: v5.17)
  FTL version is v5.19.1 (Latest: v5.19.1)
  Container tag is: 2022.11

Stopping pihole-FTL
pihole-FTL: no process found

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Please comment or update this issue or it will be closed in 5 days.

[ghost]

Hey, I've resolved this issue by stopping systemd-resolved on my host system which was hogging up port 53.

[arakis]

I have a similar problem. When i add port=5353 to ./etc-dnsmasq.d/02-custom.conf, it wont't start anymore (the same error). But i need to change the FTL DNSmasq port, because i want to use --net=host AND using the original dnsmasq of the Linux operating system (because i need the feature nftset).

I'm unable to change the FTL Port to a custom port (i do not mean docker port mapping - this will not work when using --net=host).

Edit: I got it working. Accidentally, I wrote port 5353 instead of port=5353 🤦