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CPANEL-36050 - Backblaze B2: Backup transport errors

phil99
We have occasional problems when uploading to Backblaze B2, with backups failing to upload. There are errors in cpbackup_transporter.log like the following example (actual account name has been replaced with "accountx"): [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Uploading account backup /backup_cpanel/2021-02-23/accounts/account1.tar.gz to backup_cpanel/2021-02-23/accounts/account1.tar.gz (from 2021-02-23/accounts/account1.tar.gz) [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Attempting to upload /backup_cpanel/2021-02-23/accounts/account1.tar.gz to backup_cpanel/2021-02-23/accounts/account1.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Upload attempt #1 starting for /backup_cpanel/2021-02-23/accounts/account1.tar.gz to backup_cpanel/2021-02-23/accounts/account1.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:19 +0000] warn [cpbackup_transporter] Upload attempt failed: Cpanel::Exception::HTTP::Network/(XID 4rn8t3) The system failed to send an HTTP "GET" request to "https://api.backblazeb2.com/b2api/v1/b2_authorize_account" because of an error: CODE :500: MSG :500 Can't connect to api.backblazeb2.com:443 (Name or service not known): Can't connect to api.backblazeb2.com:443 (Name or service not known) Name or service not known at /usr/local/cpanel/3rdparty/perl/530/lib/perl5/cpanel_lib/LWP/Protocol/http.pm line 50. at /usr/local/cpanel/Cpanel/Transport/Files/Backblaze.pm line 122. Cpanel::Transport::Files::Backblaze::_error(Cpanel::Transport::Files::Backblaze=HASH(0x37befe8), "HTTP::Network", HASH(0x31660e8)) called at /usr/local/cpanel/Cpanel/Transport/Files/Backblaze.pm line 272 [Lots more perl stuff snipped]
The backup software then immediately tries twice more: [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Upload attempt #2 starting for /backup_cpanel/2021-02-23/accounts/account1.tar.gz to backup_cpanel/2021-02-23/accounts/account1.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:19 +0000] warn [cpbackup_transporter] Upload attempt failed: Cpanel::Exception::HTTP::Network/(XID 9ed6ug) The system failed to send an HTTP "GET" request to "https://api.backblazeb2.com/b2api/v1/b2_authorize_account" because of an error: CODE :500: MSG :500 Can't connect to api.backblazeb2.com:443 (Name or service not known): Can't connect to api.backblazeb2.com:443 (Name or service not known) ... [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Upload attempt #3 starting for /backup_cpanel/2021-02-23/accounts/account1.tar.gz to backup_cpanel/2021-02-23/accounts/account1.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:19 +0000] warn [cpbackup_transporter] Upload attempt failed: Cpanel::Exception::HTTP::Network/(XID 24zw5x) The system failed to send an HTTP "GET" request to "https://api.backblazeb2.com/b2api/v1/b2_authorize_account" because of an error: CODE :500: MSG :500 Can't connect to api.backblazeb2.com:443 (Name or service not known): Can't connect to api.backblazeb2.com:443 (Name or service not known)
After failing for a third time, it gives up and immediately moves onto the next account: [2021-02-23 05:03:19 +0000] info [cpbackup_transporter] Upload attempt #1 starting for /backup_cpanel/2021-02-23/accounts/account2.tar.gz to backup_cpanel/2021-02-23/accounts/account2.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:19 +0000] warn [cpbackup_transporter] Upload attempt failed: Cpanel::Exception::HTTP::Network/(XID amkjxg) The system failed to send an HTTP "GET" request to "https://api.backblazeb2.com/b2api/v1/b2_authorize_account" because of an error: CODE :500: MSG :500 Can't connect to api.backblazeb2.com:443 (Name or service not known): Can't connect to api.backblazeb2.com:443 (Name or service not known)
This carries on with a number of accounts failing to upload until there is a successful upload attempt 3 seconds later: [2021-02-23 05:03:22 +0000] info [cpbackup_transporter] Upload attempt #1 starting for /backup_cpanel/2021-02-23/accounts/account3.tar.gz to backup_cpanel/2021-02-23/accounts/account3.tar.gz for destination: Backblaze B2 [2021-02-23 05:03:25 +0000] info [cpbackup_transporter] Successful transfer of /backup_cpanel/2021-02-23/accounts/account3.tar.gz to backup_cpanel/2021-02-23/accounts/account3.tar.gz for destination Backblaze B2
I'm assuming the "error: CODE :500" is the error code received from Backblaze. If so, then according to the Backblaze blog post below [1], an error code of 500 is to be expected. If the application receives an error 500 code, it should immediately try again after getting a new url. However, if it gets another 500 code, it should wait a few seconds before trying again. It would appear that the WHM backup software is not doing this. This has resulted in the failure to upload a number of accounts. [1]

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