Issue installing docker - Failed to create btrfs snapshot: read-only file system.

[DekChi]

Hi,

 

Newbie here.  Just started using unraid a couple of days ago.  I was able to install a couple of dockers through community application without issue. 

 

Then something was loading the system.  I notice this through the dashboard.  I did go to terminal and do top.  I believed it is shfs process.  I did try to install another docker while that took about 50% of my cpu.  The installation never finish.   I figure it would let the process finish first then install again.  Installation also did not finish.  I also try to restart the NAS and that did not help.  Any suggestion???  Any help would be greatly appreciated.  I did include the diagnostics.  Please let me know if you need any other information.

 

The error is 

 

/usr/bin/docker: Error response from daemon: Failed to create btrfs snapshot: read-only file system.
See '/usr/bin/docker run --help'.

 

Thanks in advance!

nas-diagnostics-20190331-2002.zip

[trurl]

You have a corrupt docker image. Disable, delete and recreate (Settings - Docker) then you can reinstall your dockers using the Previous Apps feature on the Apps page.

[DekChi]

Thanks for the advice.  How do i know which one is corrupted?  I did try to remove my docker (any) any it showed up as 

 

Execution error

Server error

 

I did click on the log and nothing showed up.

[JorgeB]

6 hours ago, DekChi said:

How do i know which one is corrupted?

You delete the image for all dockers:

https://forums.unraid.net/topic/57181-real-docker-faq/?do=findComment&comment=564309

 

 

Also, corruption was the result of issues with the cache drive, start by replacing the cables:

 

Mar 31 19:37:12 NAS kernel: ata8.00: failed command: WRITE FPDMA QUEUED
Mar 31 19:37:12 NAS kernel: ata8.00: cmd 61/20:f8:c0:48:25/00:00:00:00:00/40 tag 31 ncq dma 16384 out
Mar 31 19:37:12 NAS kernel:         res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Mar 31 19:37:12 NAS kernel: ata8.00: status: { DRDY }
Mar 31 19:37:12 NAS kernel: ata8: hard resetting link
Mar 31 19:37:15 NAS kernel: ata8: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Mar 31 19:37:15 NAS kernel: ata8.00: configured for UDMA/133
Mar 31 19:37:15 NAS kernel: scsi_io_completion: 4 callbacks suppressed
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#20 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#20 CDB: opcode=0x2a 2a 00 00 25 30 a0 00 06 00 00
Mar 31 19:37:15 NAS kernel: print_req_error: I/O error, dev sdf, sector 2437280
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#19 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#19 CDB: opcode=0x2a 2a 00 00 25 26 a0 00 0a 00 00
Mar 31 19:37:15 NAS kernel: print_req_error: I/O error, dev sdf, sector 2434720
Mar 31 19:37:15 NAS kernel: BTRFS error (device sdf1): bdev /dev/sdf1 errs: wr 28, rd 0, flush 0, corrupt 0, gen 0
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#18 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#18 CDB: opcode=0x2a 2a 00 00 25 20 a0 00 06 00 00
Mar 31 19:37:15 NAS kernel: print_req_error: I/O error, dev sdf, sector 2433184
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#17 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x06
Mar 31 19:37:15 NAS kernel: sd 8:0:0:0: [sdf] tag#17 CDB: opcode=0x2a 2a 00 00 25 16 a0 00 0a 00 00
Mar 31 19:37:15 NAS kernel: print_req_error: I/O error, dev sdf, sector 2430624
Mar 31 19:37:15 NAS kernel: BTRFS error (device sdf1): bdev /dev/sdf1 errs: wr 29, rd 0, flush 0, corrupt 0, gen 0
Mar 31 19:37:15 NAS kernel: ata8: EH complete
Mar 31 19:37:39 NAS kernel: print_req_error: I/O error, dev loop2, sector 0
Mar 31 19:37:39 NAS kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 0, rd 0, flush 2, corrupt 0, gen 0