Backblaze B2 as S3 external-storage

ℹ️ Support
, , , , ,
1

The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 30.0.5.1
  • When did this problem seem to first start?
    • Since I start with Backblaze B2
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • docker nextcloud:latest
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • Cloudflare

Summary of the issue you are facing:

I addes Backblaze B2 as S3 eternal storage. The configuration looks good, I got a connection to B2. Uploading of files works also. I can see the files in Nextcloud and on the storage via the Backblaze Console. With b2sdk I’m able to download the files.

If I try to access the files via nextcloud, I got an 503.

My feeling is that it depends on the Backblaze B2 API. I think it is not 100% S3 compatible.

Steps to replicate it (hint: details matter!):

  1. uploading files via nextcloud to B2 as external storage- works
  2. Downloading didn’t work. I got an 503

Log entries

172.25.0.4 - - [11/Feb/2025:10:55:13 +0000] "GET /remote.php/dav/files/andreas/backblaze/media/iCloud/2014/05/14-05-17%2017-31-39.jpg HTTP/1.1" 503 1273 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36"

Nextcloud

Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.

Fehler	webdav	
ServiceUnavailable
Datei konnte nicht geöffnet werden

11.02.2025, 11:55:14	

Fehler	files_external	
Exception
Failed to read object media/iCloud/2014/05/14-05-17 17-31-39.jpg

11.02.2025, 11:55:14	

Fehler	PHP	
fopen(httpseek://): Failed to open stream: "OC\Files\Stream\SeekableHttpStream::stream_open" call failed at /var/www/html/lib/private/Files/Stream/SeekableHttpStream.php#49

11.02.2025, 11:55:14	

Fehler	PHP	
fopen(https://s3.eu-central-003.backblazeb2.com/andstore/media/iCloud/2014/05/14-05-17%2017-31-39.jpg): Failed to open stream: Connection timed out at /var/www/html/lib/private/Files/ObjectStore/S3ObjectTrait.php#72

Configuration

Nextcloud

The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "store.domain.biz",
            "172.19.0.3"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "30.0.5.1",
        "overwrite.cli.url": "https:\/\/store.domain.biz",
        "overwriteprotocol": "https",
        "installed": true,
        "maintenance": false,
        "debug": false,
        "theme": "",
        "loglevel": 1,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "app_install_overwrite": {
            "1": "activitylog",
            "2": "occweb",
            "3": "files_reader",
            "6": "keeweb"
        },
        "encryption.legacy_format_support": false,
        "encryption.key_storage_migrated": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "mail_smtpauthtype": "PLAIN",
        "trashbin_retention_obligation": "auto,30",
        "default_phone_region": "DE",
        "forbidden_filename_characters": [
            "\\",
            "\/"
        ],
        "forbidden_filename_extensions": [
            ".filepart",
            ".part"
        ],
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "memories.db.triggers.fcu": true,
        "memories.exiftool": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/exiftool-aarch64-glibc",
        "memories.vod.path": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/go-vod-aarch64",
        "enabledPreviewProviders": [
            "OC\\Preview\\Image",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\TIFF",
            "OC\\Preview\\Imaginary"
        ],
        "preview_max_x": 2048,
        "preview_max_y": 2048,
        "memories.vod.disable": false,
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.gis_type": 1
    }
}```
2

B2’s S3 implementation has worked well for me in the past. I used it early on for a lot of my testing.

Can you post the full raw log entries rather than just the shortened ones? Need to see the full entries.

3

Here is the logfile:


{"reqId":"ew7HcT8WLp2dypBDAyjD","level":3,"time":"2025-02-14T11:08:21+00:00","remoteAddr":"ANONYMIZED_IPV6","user":"--","app":"index","method":"GET","url":"/index.php/apps/files/preview-service-worker.js","message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36","version":"30.0.5.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","Code":2002,"Trace":[{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":453,"function":"connect","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":411,"function":"getDatabasePlatformVersion","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":318,"function":"detectDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/Connection.php","line":899,"function":"getDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/ConnectionAdapter.php","line":235,"function":"getDatabaseProvider","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php","line":96,"function":"getDatabaseProvider","class":"OC\\DB\\ConnectionAdapter","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1211,"function":"expr","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":237,"function":"loadConfig","class":"OC\\AppConfig","type":"->","args":[false]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1351,"function":"searchValues","class":"OC\\AppConfig","type":"->","args":["enabled",false,2]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":126,"function":"getValues","class":"OC\\AppConfig","type":"->","args":[false,"enabled"]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":147,"function":"getInstalledAppsValues","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/legacy/OC_App.php","line":191,"function":"getInstalledApps","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/Coordinator.php","line":48,"function":"getEnabledApps","class":"OC_App","type":"::","args":[]},{"file":"/var/www/html/lib/base.php","line":659,"function":"runInitialRegistration","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->","args":[]},{"file":"/var/www/html/lib/base.php","line":1134,"function":"init","class":"OC","type":"::","args":[]},{"file":"/var/www/html/index.php","line":22,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/lib/private/DB/Connection.php","Line":233,"message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","exception":{},"CustomMessage":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused"}}
{"reqId":"ew7HcT8WLp2dypBDAyjD","level":3,"time":"2025-02-14T11:08:21+00:00","remoteAddr":"ANONYMIZED_IPV6","user":"--","app":"core","method":"GET","url":"/index.php/apps/files/preview-service-worker.js","message":"Exception thrown: Doctrine\\DBAL\\Exception","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36","version":"30.0.5.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","Code":2002,"Trace":[{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":453,"function":"connect","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":411,"function":"getDatabasePlatformVersion","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":318,"function":"detectDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/Connection.php","line":899,"function":"getDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/ConnectionAdapter.php","line":235,"function":"getDatabaseProvider","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php","line":96,"function":"getDatabaseProvider","class":"OC\\DB\\ConnectionAdapter","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1211,"function":"expr","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":237,"function":"loadConfig","class":"OC\\AppConfig","type":"->","args":[false]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1351,"function":"searchValues","class":"OC\\AppConfig","type":"->","args":["enabled",false,2]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":126,"function":"getValues","class":"OC\\AppConfig","type":"->","args":[false,"enabled"]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":147,"function":"getInstalledAppsValues","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/legacy/OC_App.php","line":191,"function":"getInstalledApps","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/Coordinator.php","line":48,"function":"getEnabledApps","class":"OC_App","type":"::","args":[]},{"file":"/var/www/html/lib/base.php","line":659,"function":"runInitialRegistration","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->","args":[]},{"file":"/var/www/html/lib/base.php","line":1134,"function":"init","class":"OC","type":"::","args":[]},{"file":"/var/www/html/index.php","line":22,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/lib/private/DB/Connection.php","Line":233,"CustomMessage":"Exception thrown: Doctrine\\DBAL\\Exception"}}
{"reqId":"ew7HcT8WLp2dypBDAyjD","level":3,"time":"2025-02-14T11:08:21+00:00","remoteAddr":"ANONYMIZED_IPV6","user":"--","app":"core","method":"GET","url":"/index.php/apps/files/preview-service-worker.js","message":"Exception thrown: Doctrine\\DBAL\\Exception","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36","version":"30.0.5.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","Code":2002,"Trace":[{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":453,"function":"connect","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":411,"function":"getDatabasePlatformVersion","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":318,"function":"detectDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/Connection.php","line":899,"function":"getDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/ConnectionAdapter.php","line":235,"function":"getDatabaseProvider","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php","line":96,"function":"getDatabaseProvider","class":"OC\\DB\\ConnectionAdapter","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1211,"function":"expr","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":237,"function":"loadConfig","class":"OC\\AppConfig","type":"->","args":[false]},{"file":"/var/www/html/lib/private/legacy/OC_App.php","line":695,"function":"searchValues","class":"OC\\AppConfig","type":"->","args":["installed_version"]},{"file":"/var/www/html/lib/private/TemplateLayout.php","line":198,"function":"getAppVersions","class":"OC_App","type":"::","args":[]},{"file":"/var/www/html/lib/private/legacy/OC_Template.php","line":119,"function":"__construct","class":"OC\\TemplateLayout","type":"->","args":["error",""]},{"file":"/var/www/html/lib/private/Template/Base.php","line":113,"function":"fetchPage","class":"OC_Template","type":"->","args":[]},{"file":"/var/www/html/lib/private/legacy/OC_Template.php","line":296,"function":"printPage","class":"OC\\Template\\Base","type":"->","args":[]},{"file":"/var/www/html/index.php","line":89,"function":"printExceptionErrorPage","class":"OC_Template","type":"::","args":[{"__class__":"Doctrine\\DBAL\\Exception"},500]}],"File":"/var/www/html/lib/private/DB/Connection.php","Line":233,"CustomMessage":"Exception thrown: Doctrine\\DBAL\\Exception"}}
{"reqId":"69idFiBfNQSX8ud305Ih","level":3,"time":"2025-02-14T11:08:26+00:00","remoteAddr":"ANONYMIZED_IPV6","user":"--","app":"index","method":"GET","url":"/index.php/apps/files/preview-service-worker.js","message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36","version":"30.0.5.1","exception":{"Exception":"Doctrine\\DBAL\\Exception","Message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","Code":2002,"Trace":[{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":453,"function":"connect","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":411,"function":"getDatabasePlatformVersion","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/3rdparty/doctrine/dbal/src/Connection.php","line":318,"function":"detectDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/Connection.php","line":899,"function":"getDatabasePlatform","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/ConnectionAdapter.php","line":235,"function":"getDatabaseProvider","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/html/lib/private/DB/QueryBuilder/QueryBuilder.php","line":96,"function":"getDatabaseProvider","class":"OC\\DB\\ConnectionAdapter","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1211,"function":"expr","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppConfig.php","line":237,"function":"loadConfig","class":"OC\\AppConfig","type":"->","args":[false]},{"file":"/var/www/html/lib/private/AppConfig.php","line":1351,"function":"searchValues","class":"OC\\AppConfig","type":"->","args":["enabled",false,2]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":126,"function":"getValues","class":"OC\\AppConfig","type":"->","args":[false,"enabled"]},{"file":"/var/www/html/lib/private/App/AppManager.php","line":147,"function":"getInstalledAppsValues","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/legacy/OC_App.php","line":191,"function":"getInstalledApps","class":"OC\\App\\AppManager","type":"->","args":[]},{"file":"/var/www/html/lib/private/AppFramework/Bootstrap/Coordinator.php","line":48,"function":"getEnabledApps","class":"OC_App","type":"::","args":[]},{"file":"/var/www/html/lib/base.php","line":659,"function":"runInitialRegistration","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->","args":[]},{"file":"/var/www/html/lib/base.php","line":1134,"function":"init","class":"OC","type":"::","args":[]},{"file":"/var/www/html/index.php","line":22,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/lib/private/DB/Connection.php","Line":233,"message":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused","exception":{},"CustomMessage":"Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused"}}
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Hopefully it helps

4

Looks like network connectivity (or a hiccup at Backblaze) based on the logs.

Also suspicious is that you’re environment looks like it may be experiencing transient connectivity problems with your database.

Perhaps they’re related. What’s your full stack look like? Maybe there’s some sort of problem on the underlying host impacting connectivity or DNS resolution?

5

fopen(https://MYBUCKET.s3.eu-central-003.backblazeb2.com/media/Photos/2025/02/IMG_2266.jpg)

fopen(https://s3.eu-central-003.backblazeb2.com/andstore/media/iCloud/2014/05/14-05-17%2017-31-39.jpg)

Did you toggle the S3 path style setting between your initial post and your follow-up logs?