Dns_get_record error from DnsPinMiddleware.php#96

Support intro
  • Nextcloud version : 30.0.1.2 (docker)
  • Operating system and version: Debian 12
  • Apache or nginx version: 2.12.1 (docker)
  • PHP version: 8.2.25
  • Other information such as config.php, compose file, and npm config are all at the end of this post.

My nextcloud periodically generate the dns_get_record error below everyday:

dns_get_record(): A temporary server error occurred. at /var/www/html/lib/private/Http/Client/DnsPinMiddleware.php#96

(My nextcloud.log here)
Recently, I changed to another IP and router to to see if it’s my router’s issue, and I have noticed another type of warning also got generated (shown below). It might be related to the error, but I’m not sure how to debug the issue.

LocalServerException No DNS record found for apps.nextcloud.com
LocalServerException No DNS record found for download.nextcloud.com
issue while running UpdateSingleMetadata

(My nextcloud.log here)
Here are the things I have tried yet not solving the problem:

  1. Since I’m also using IOTstack to start my docker-compose file, I have tried adding --dns 1.1.1.1 into my docker-compose file like the post Error: dns_get_record(): on first run suggests.
  2. Change DnsPinMiddleware.php like this git issue Log flooded with “dns_get_record(): A temporary server error occurred” suggests. This git issue mentions that Debian has another issue (#3 below)
  3. Change /etc/nsswitch.conf to hosts: files dns myhostname like this git issue ( Intermittent DNS name resolution failure, likely IPv6-related)

I’ll continue listing the things I have tried but if anyone knows what’s the issue or what I could have do better to debug this, please let me know. Thanks.

My config.php file:
<?php
$CONFIG = array (
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 => 
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'redis',
    'password' => '',
    'port' => 6379,
  ),
  'upgrade.disable-web' => true,
  'updatechecker' => true,
  'instanceid' => 'removed',
  'passwordsalt' => 'removed',
  'secret' => 'removed',
  'trusted_domains' => 
  array (
    0 => 'removed',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'sqlite3',
  'version' => '30.0.2.2',
  'overwrite.cli.url' => 'removed',
  'installed' => true,
  'memories.db.triggers.fcu' => true,
  'memories.exiftool' => '/var/www/html/custom_apps/memories/bin-ext/exiftool-aarch64-musl',
  'memories.vod.path' => '/var/www/html/custom_apps/memories/bin-ext/go-vod-aarch64',
  'maintenance' => false,
  'loglevel' => 2,
  'enabledPreviewProviders' => 
  array (
  ),
  'preview_max_x' => 2048,
  'preview_max_y' => 2048,
  'jpeg_quality' => '60',
  'check_data_directory_permissions' => false,
  'forbidden_filename_basenames' => 
  array (
    0 => 'con',
    1 => 'prn',
    2 => 'aux',
    3 => 'nul',
    4 => 'com0',
    5 => 'com1',
    6 => 'com2',
    7 => 'com3',
    8 => 'com4',
    9 => 'com5',
    10 => 'com6',
    11 => 'com7',
    12 => 'com8',
    13 => 'com9',
    14 => 'com¹',
    15 => 'com²',
    16 => 'com³',
    17 => 'lpt0',
    18 => 'lpt1',
    19 => 'lpt2',
    20 => 'lpt3',
    21 => 'lpt4',
    22 => 'lpt5',
    23 => 'lpt6',
    24 => 'lpt7',
    25 => 'lpt8',
    26 => 'lpt9',
    27 => 'lpt¹',
    28 => 'lpt²',
    29 => 'lpt³',
  ),
  'forbidden_filename_characters' => 
  array (
    0 => '<',
    1 => '>',
    2 => ':',
    3 => '"',
    4 => '|',
    5 => '?',
    6 => '*',
    7 => '\\',
    8 => '/',
  ),
  'forbidden_filename_extensions' => 
  array (
    0 => ' ',
    1 => '.',
    2 => '.filepart',
    3 => '.part',
  ),
);

Compose File
networks:
  default:
    driver: bridge
    ipam:
      driver: default
  nextcloud_net:
    driver: bridge
    internal: true
    ipam:
      driver: default

x-nextcloud-common-envVar:
  &nextcloud-common
  MYSQL_PASSWORD=*removed*
  MYSQL_DATABASE=nextcloud
  MYSQL_USER=nextcloud

services:
  portainer-ce:
    container_name: portainer-ce
    image: portainer/portainer-ce
    restart: unless-stopped
    ports:
      - 8000:8000
      - 9000:9000
      - 9443:9443
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ./volumes/portainer-ce/data:/data

  nextcloud:
    image: nextcloud:fpm-alpine
    volumes:
      - ./volumes/nextcloud/html:/var/www/html:z
      - /media/onetouch5t/LocalStorage:/onetouch5t/LocalStorage:z
    container_name: nextcloud
    restart: unless-stopped
    environment:
      - <<=*nextcloud-common
      - TZ=${TZ:-Etc/UTC}
      - MYSQL_HOST=nextcloud_db
      - REDIS_HOST=redis
    depends_on:
      - nextcloud_db
      - redis
    networks:
      - default
      - nextcloud_net

  nextcloud_db:
    image: mariadb:10.6
    command: --transaction-isolation=READ-COMMITTED --log-bin=binlog --binlog-format=ROW
    volumes:
      - ./volumes/nextcloud/db:/var/lib/mysql:Z
    container_name: nextcloud_db
    restart: unless-stopped
    environment:
      - <<=*nextcloud-common
      - MYSQL_ROOT_PASSWORD=*removed*
    networks:
      - nextcloud_net

  redis:
    container_name: nextcloud_redis
    image: redis:alpine
    restart: unless-stopped
    networks:
      - nextcloud_net

  cron:
    container_name: nextcloud_cron
    image: nextcloud:fpm-alpine
    restart: unless-stopped
    volumes:
      - ./volumes/nextcloud/html:/var/www/html:z
      - /media/onetouch5t/LocalStorage:/onetouch5t/LocalStorage:z
    entrypoint: /cron.sh
    depends_on:
      - nextcloud_db
      - redis
    networks:
      - nextcloud_net

  nginxProxyManager:
    image: jc21/nginx-proxy-manager:latest
    container_name: nginxProxyManager
    restart: unless-stopped
    ports:
      - 80:80
      - 443:443
      - 81:81
    environment:
      REAL_IP_HEADER: X-Real-IP
      TRUSTED_PROXIES: 172.0.0.0/8, 10.0.0.0/8, 192.168.0.0/16
    volumes:
      - ./volumes/nginxProxyManager/data:/data
      - ./volumes/nginxProxyManager/letsencrypt:/etc/letsencrypt
      - ./volumes/nextcloud/html:/var/www/html:ro,z
      - /media/onetouch5t/LocalStorage:/onetouch5t/LocalStorage:ro,z
    networks:
      - default

  duckdns:
    environment:
      TOKEN: removed
      SUBDOMAINS: removed
      PUID: 1000
      PGID: 1000
    container_name: duckdns
    build: https://github.com/ukkopahis/docker-duckdns.git
    network_mode: host
    restart: unless-stopped
Nginx Proxy Manager advanced config
# Path to the root of your installation
root /var/www/html;
# set max upload size
client_max_body_size 512M;
client_body_timeout 300s;
fastcgi_buffers 64 4K;
# Enable gzip but do not remove ETag headers
gzip on;
gzip_vary on;
gzip_comp_level 4;
gzip_min_length 256;
gzip_proxied expired no-cache no-store private no_last_modified no_etag auth;
gzip_types application/atom+xml text/javascript application/javascript application/json application/ld+json application/manifest+json application/rss+xml application/vnd.geo+json application/vnd.ms-fontobject application/wasm application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/bmp image/svg+xml image/x-icon text/cache-manifest text/css text/plain text/vcard text/vnd.rim.location.xloc text/vtt text/x-component text/x-cross-domain-policy;
# Pagespeed is not supported by Nextcloud, so if your server is built
# with the `ngx_pagespeed` module, uncomment this line to disable it.
#pagespeed off;
# The settings allows you to optimize the HTTP2 bandwidth.
# See https://blog.cloudflare.com/delivering-http-2-upload-speed-improvements/
# for tuning hints
client_body_buffer_size 512k;
# HTTP response headers borrowed from Nextcloud `.htaccess`
add_header Referrer-Policy                   "no-referrer"       always;
add_header X-Content-Type-Options            "nosniff"           always;
#add_header X-Download-Options                "noopen"            always;
add_header X-Frame-Options                   "SAMEORIGIN"        always;
add_header X-Permitted-Cross-Domain-Policies "none"              always;
add_header X-Robots-Tag                      "noindex, nofollow" always;
add_header X-XSS-Protection                  "1; mode=block"     always;

# Remove X-Powered-By, which is an information leak
fastcgi_hide_header X-Powered-By;

# Set .mjs and .wasm MIME types
# Either include it in the default mime.types list
# and include that list explicitly or add the file extension
# only for Nextcloud like below:
include mime.types;
types {
    text/javascript mjs;
    application/wasm wasm;
}

# Specify how to handle directories -- specifying `/index.php$request_uri`
# here as the fallback means that Nginx always exhibits the desired behaviour
# when a client requests a path that corresponds to a directory that exists
# on the server. In particular, if that directory contains an index.php file,
# that file is correctly served; if it doesn't, then the request is passed to
# the front-end controller. This consistent behaviour means that we don't need
# to specify custom rules for certain paths (e.g. images and other assets,
# `/updater`, `/ocs-provider`), and thus
# `try_files $uri $uri/ /index.php$request_uri`
# always provides the desired behaviour.
index index.php index.html /index.php$request_uri;
# Rule borrowed from `.htaccess` to handle Microsoft DAV clients
location = / {
    if ( $http_user_agent ~ ^DavClnt ) {
        return 302 /remote.php/webdav/$is_args$args;
    }
}
location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
}
# Make a regex exception for `/.well-known` so that clients can still
# access it despite the existence of the regex rule
# `location ~ /(\.|autotest|...)` which would otherwise handle requests
# for `/.well-known`.
location ^~ /.well-known {
    # The rules in this block are an adaptation of the rules
    # in `.htaccess` that concern `/.well-known`.
    location = /.well-known/carddav { return 301 /remote.php/dav/; }
    location = /.well-known/caldav  { return 301 /remote.php/dav/; }
    location /.well-known/acme-challenge    { try_files $uri $uri/ =404; }
    location /.well-known/pki-validation    { try_files $uri $uri/ =404; }
    # Let Nextcloud's API for `/.well-known` URIs handle all other
    # requests by passing them to the front-end controller.
    return 301 /index.php$request_uri;
}
# Rules borrowed from `.htaccess` to hide certain paths from clients
location ~ ^/(?:build|tests|config|lib|3rdparty|templates|data)(?:$|/)  { return 404; }
location ~ ^/(?:\.|autotest|occ|issue|indie|db_|console)                { return 404; }
# Ensure this block, which passes PHP files to the PHP process, is above the blocks
# which handle static assets (as seen below). If this block is not declared first,
# then Nginx will encounter an infinite rewriting loop when it prepends `/index.php`
# to the URI, resulting in a HTTP 500 error response.
location ~ \.php(?:$|/) {
    # Required for legacy support
    rewrite ^/(?!index|remote|public|cron|core\/ajax\/update|status|ocs\/v[12]|updater\/.+|ocs-provider\/.+|.+\/richdocumentscode(_arm64)?\/proxy) /index.php$request_uri;
    fastcgi_split_path_info ^(.+?\.php)(/.*)$;
    set $path_info $fastcgi_path_info;
    try_files $fastcgi_script_name =404;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $path_info;
    #fastcgi_param HTTPS on;
    fastcgi_param modHeadersAvailable true;         # Avoid sending the security headers twice
    fastcgi_param front_controller_active true;     # Enable pretty urls
    fastcgi_pass nextcloud:9000;
    fastcgi_intercept_errors on;
    fastcgi_request_buffering off;
    fastcgi_max_temp_file_size 0;
}
# Serve static files
location ~ \.(?:css|js|mjs|svg|gif|ico|jpg|png|webp|wasm|tflite|map|ogg|flac)$ {
try_files $uri /index.php$request_uri;
# HTTP response headers borrowed from Nextcloud `.htaccess`
# add_header Cache-Control                     "public, max-age=15778463$asset_immutable";
add_header Referrer-Policy                   "no-referrer"       always;
add_header X-Content-Type-Options            "nosniff"           always;
add_header X-Frame-Options                   "SAMEORIGIN"        always;
add_header X-Permitted-Cross-Domain-Policies "none"              always;
add_header X-Robots-Tag                      "noindex, nofollow" always;
add_header X-XSS-Protection                  "1; mode=block"     always;
access_log off;     # Optional: Don't log access to assets
}

location ~ \.(otf|woff2?)$ {
try_files $uri /index.php$request_uri;
expires 7d;         # Cache-Control policy borrowed from `.htaccess`
access_log off;     # Optional: Don't log access to assets
}

# Rule borrowed from `.htaccess`
location /remote {
return 301 /remote.php$request_uri;
}

location / {
try_files $uri $uri/ /index.php$request_uri;
}

seems similar to dns_get_record error in log (unfortunately no progress there as well). But this is definitely not a generic issue as my 3 Docker-based instances don’t show this problem. Please review the DNS resolution manually by running this command:

docker compose exec nextcloud php -r "var_dump(dns_get_record('nextcloud.com', DNS_A ) ) ;"
docker compose exec nextcloud php -r "var_dump(dns_get_record('nextcloud.com', DNS_AAAA ) ) ;"

I see you are using some DNS service - I often found connections between two containers running on the same host fail (due to the firewall?) - this might be a reason your container can not resolve DNS names using you custom DNS server…

I ran those two commands but I didn’t see any error. Could you check it for me?

Here is the result
pi@raspberrypi:~ $ docker exec -u www-data nextcloud php -r "var_dump(dns_get_record('nextcloud.com', DNS_A ) ) ;"
array(1) {
  [0]=>
  array(5) {
    ["host"]=>
    string(13) "nextcloud.com"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(300)
    ["type"]=>
    string(1) "A"
    ["ip"]=>
    string(12) "85.10.195.17"
  }
}
pi@raspberrypi:~ $ docker exec -u www-data nextcloud php -r "var_dump(dns_get_record('nextcloud.com', DNS_AAAA ) ) ;"
array(1) {
  [0]=>
  array(5) {
    ["host"]=>
    string(13) "nextcloud.com"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(300)
    ["type"]=>
    string(4) "AAAA"
    ["ipv6"]=>
    string(19) "2a01:4f8:a0:3068::2"
  }
}

Sorry I have so many questions about your comments:

I see you are using some DNS service

You mentioned that you saw I’m using some DNS service, could you tell me which line in the log you see it? It’s probably the provider’s DNS, but I thought I have already changed it in my first router. It would help me check if I have successfully changed it or not. Or maybe I was experimenting something that forgot to change it back…

I often found connections between two containers running on the same host fail (due to the firewall?)

Are you saying the nextcloud and its database? But wouldn’t that be the same as the example? Sorry a bit confused now

Another question, why my nextcloud is trying to connect to nextcloud.com periodically? Is it the update checker that I should disable (updatechecker to false)? Sorry new to nextcloud, and thanks for the help.

I see same results so looks good. but definitely you should learn to understand what you are doing and what to expect sooner than later.

this conclusion was based on “duckdns” service.

there might be many reasons… I remember a writeup somewhere why the app would connect to appstore and other nextcloud.com sites but I don’t have the reference now - I would search at Nextcloud · GitHub I i definitely not recommend disabling the update checker - you want update notifications.

Reading through the github issue you referenced it seems to be some implementation detail of specific DNS servers:

some DNS servers will block dns_any requests.

may it’s worth you add you findings and system details so dev could isolate the problem. I would give a try to supposed workaround as well