O problema de volume do Amazon AWS EC2 impede o acesso de instâncias via SSH

Question

Eu tenho um Amazon EC2 Ubuntu t2.nano na região sa-east-1. Estava funcionando bem até 2017-06-14 manutenção.

Hoje, ao tentar acessá-lo via ssh, notei que não era possível. Eu recebo conexão ssh recusada. Então eu mudei para o console aws e olhei duas coisas:

Captura de tela da instância:

eLogdosistema(mostradoemparteabaixo):

[5.500346]systemd[1]:StartingMonitoringofLVM2mirrors,snapshotsetc.usingdmeventdorprogresspolling...StartingMonitoringofLVM2mirrors...dmeventdorprogresspolling...[5.513090]systemd[1]:ReachedtargetEncryptedVolumes.[[0;32mOK[0m]ReachedtargetEncryptedVolumes.[5.519554]systemd[1]:ListeningonJournalAuditSocket.[[0;32mOK[0m]ListeningonJournalAuditSocket.[5.527501]systemd[1]:StartingJournalService...StartingJournalService...[5.533351]systemd[1]:SetupautomountArbitraryExecutableFileFormatsFileSystemAutomountPoint.[5.540655]LoadingiSCSItransportclassv2.0-870.[[0;32mOK[0m]SetupautomountArbitraryExecutab...atsFileSystemAutomountPoint.[5.551818]systemd[1]:MountedDebugFileSystem.[[0;32mOK[0m]MountedDebugFileSystem.[5.559413]systemd[1]:MountedHugePagesFileSystem.[[0;32mOK[0m]MountedHugePagesFileSystem.[5.567656]systemd[1]:MountedPOSIXMessageQueueFileSystem.[[0;32mOK[0m][5.573542]iscsi:registeredtransport(tcp)MountedPOSIXMessageQueueFileSystem.[5.578385]systemd[1]:StartedSetconsolekeymap.[[0;32mOK[0m]StartedSetconsolekeymap.[5.587286]systemd[1]:StartedCreatelistofrequiredstaticdevicenodesforthecurrentkernel.[[0;32mOK[0m]StartedCreatelistofrequiredsta...cenodesforthecurrentkernel.[5.600884]systemd[1]:StartedUncomplicatedfirewall.[[0;32mOK[0m]StartedUncomplicatedfirewall.[5.607939]systemd[1]:StartedRemountRootandKernelFileSystems.[[0;32mOK[0m]StartedRemountRootandKernelFileSystems.[5.627380]systemd[1]:StartedNameserverinformationmanager.[[0;32mOK[0m[5.635695]iscsi:registeredtransport(iser)]StartedNameserverinformationmanager.[5.642535]systemd[1]:StartedLoadKernelModules.[[0;32mOK[0m]StartedLoadKernelModules.[5.660181]systemd[1]:StartedJournalService.[[0;32mOK[0m]StartedJournalService.StartingApplyKernelVariables...MountingFUSEControlFileSystem...[[0;32mOK[0m]StartedLVM2metadatadaemon.StartingFlushJournaltoPersistentStorage...StartingInitialcloud-initjob(pre-networking)...StartingudevColdplugallDevices...StartingLoad/SaveRandomSeed...StartingCreateStaticDeviceNodesin/dev...[[0;32mOK[0m]MountedFUSEControlFileSystem.[[0;32mOK[0m]StartedApplyKernelVariables.[[0;32mOK[0m]StartedLoad/SaveRandomSeed.[[0;32mOK[0m]StartedudevColdplugallDevices.[[0;32mOK[0m]StartedFlushJournaltoPersistentStorage.[[0;32mOK[0m]StartedCreateStaticDeviceNodesin/dev.StartingudevKernelDeviceManager...[[0;32mOK[0m]StartedudevKernelDeviceManager.[[0;32mOK[0m]StartedDispatchPasswordRequeststoConsoleDirectoryWatch.[[0;32mOK[0m]StartedMonitoringofLVM2mirrors,...ngdmeventdorprogresspolling.[[0;32mOK[0m]ReachedtargetLocalFileSystems(Pre).[[0;32mOK[0m]Founddevice/dev/ttyS0.[[0;32mOK[0m]Founddevice/sys/subsystem/net/devices/eth0.[[0;32mOK[0m]ListeningonLoad/SaveRFKillSwitchStatus/dev/rfkillWatch.[8.686223]cloud-init[415]:Cloud-initv.0.7.8running'init-local'atThu,15Jun201713:02:25+0000.Up8.20seconds.[[0;32mOK[0m]StartedInitialcloud-initjob(pre-networking).[[0;32mOK[0m]ReachedtargetNetwork(Pre).[[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(8s/1min30s)[K[[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(9s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(9s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(10s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(10s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(11s/1min30s)[K[[0;31m*[0;1;31m*[0m]Astartjobisrunningfordev-xvdf.device(11s/1min30s)[K[[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(12s/1min30s)[K[[0;31m*[0;1;31m*[0m]Astartjobisrunningfordev-xvdf.device(12s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(13s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(13s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(14s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(14s/1min30s)[K[[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(15s/1min30s)[K[[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(15s/1min30s)[K[[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(16s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(16s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(17s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(17s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(18s/1min30s)[K[[0;31m*[0;1;31m*[0m]Astartjobisrunningfordev-xvdf.device(18s/1min30s)[K[[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(19s/1min30s)[K[[0;31m*[0;1;31m*[0m]Astartjobisrunningfordev-xvdf.device(19s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(20s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(20s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(21s/1min30s)[K[[0;31m*[0;1;31m*[0m[0;31m*[0m]Astartjobisrunningfordev-xvdf.device(21s/1min30s)[K[[0;1;31m*[0m[0;31m*[0m]Astartjobi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[[0;32m  OK  [0m] Closed LXD - unix socket.
[[0;32m  OK  [0m] Stopped Auto import assertions from block devices.
[[0;32m  OK  [0m] Closed Syslog Socket.
[[0;32m  OK  [0m] Stopped Snappy daemon.
[[0;32m  OK  [0m] Stopped LSB: Set up cgroupfs mounts..
[[0;32m  OK  [0m] Stopped Service for virtual machines hosted on VMware.
[[0;32m  OK  [0m] Stopped Serial Getty on ttyS0.
[[0;32m  OK  [0m] Stopped Hold until boot process finishes up.
[[0;32m  OK  [0m] Stopped /etc/rc.local Compatibility.
[[0;32m  OK  [0m] Stopped Permit User Sessions.
         Starting Set console scheme...
[[0;32m  OK  [0m] Reached target Login Prompts.
[[0;32m  OK  [0m] Stopped LSB: Record successful boot for GRUB.
[[0;32m  OK  [0m] Stopped noip2.service.
[[0;32m  OK  [0m] Stopped Deferred execution scheduler.
[[0;32m  OK  [0m] Stopped ACPI Events Check.
[[0;32m  OK  [0m] Stopped Login Service.
[[0;32m  OK  [0m] Stopped FUSE filesystem for LXC.
[[0;32m  OK  [0m] Stopped Accounts Service.
[[0;32m  OK  [0m] Stopped Timer to automatically refresh installed snaps.
[[0;32m  OK  [0m] Reached target Timers.
[[0;32m  OK  [0m] Stopped LSB: automatic crash report generation.
[[0;32m  OK  [0m] Closed D-Bus System Message Bus Socket.
[[0;32m  OK  [0m] Stopped Regular background program processing daemon.
[[0;32m  OK  [0m] Closed Socket activation for snappy daemon.
[[0;32m  OK  [0m] Stopped LSB: Apache2 web server.
[[0;32m  OK  [0m] Stopped target Basic System.
[[0;32m  OK  [0m] Reached target Paths.
[[0;32m  OK  [0m] Reached target Sockets.
[[0;32m  OK  [0m] Stopped target System Initialization.
         Starting LSB: AppArmor initialization...
         Starting Create Volatile Files and Directories...
[[0;32m  OK  [0m] Started Emergency Shell.
         Starting Tell Plymouth To Write Out Runtime Data...
[[0;32m  OK  [0m] Reached target Emergency Mode.
[[0;32m  OK  [0m] Started Set console font and keymap.
[[0;32m  OK  [0m] Started Set console scheme.
[[0;32m  OK  [0m] Started Create Volatile Files and Directories.
         Starting Network Time Synchronization...
         Starting Update UTMP about System Boot/Shutdown...
[[0;32m  OK  [0m] Created slice system-getty.slice.
[[0;32m  OK  [0m] Started Tell Plymouth To Write Out Runtime Data.
[[0;32m  OK  [0m] Started Network Time Synchronization.
[[0;32m  OK  [0m] Reached target System Time Synchronized.
[[0;32m  OK  [0m] Started Update UTMP about System Boot/Shutdown.
         Starting Update UTMP about System Runlevel Changes...
[[0;32m  OK  [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m  OK  [0m] Started LSB: AppArmor initialization.
         Starting Raise network interfaces...
[[0;32m  OK  [0m] Started ifup for eth0.
[[0;32m  OK  [0m] Started Raise network interfaces.
         Starting Initial cloud-init job (metadata service crawler)...
[[0;32m  OK  [0m] Reached target Network.
[   97.469232] cloud-init[923]: Cloud-init v. 0.7.8 running 'init' at Thu, 15 Jun 2017 13:03:54 +0000. Up 96.85 seconds.
[   97.476693] cloud-init[923]: ci-info: +++++++++++++++++++++++++++++++++++++Net device info++++++++++++++++++++++++++++++++++++++
[   97.484692] cloud-init[923]: ci-info: +--------+------+----------------------------+---------------+-------+-------------------+
[   97.496661] cloud-init[923]: ci-info: | Device |  Up  |          Address           |      Mask     | Scope |     Hw-Address    |
[   97.504676] cloud-init[923]: ci-info: +--------+------+----------------------------+---------------+-------+-------------------+
[   97.512656] cloud-init[923]: ci-info: |  eth0  | True |       172.31.28.229        | 255.255.240.0 |   .   | 02:92:48:51:32:d5 |
[   97.520690] cloud-init[923]: ci-info: |  eth0  | True | fe80::92:48ff:fe51:32d5/64 |       .       |  link | 02:92:48:51:32:d5 |
[   97.532598] cloud-init[923]: ci-info: |   lo   | True |         127.0.0.1          |   255.0.0.0   |   .   |         .         |[[0;32m  OK  [0m] Started Initial cloud-init job (metadata service crawler).
[[0;32m  OK  [0m
[   97.540937] cloud-init[923]: ci-info: |   lo   | True |          ::1/128           |       .       |  host |         .         |] Reached target Cloud-config availability.
[[0;32m  OK  [0m] Reached target Network is Online.

[   97.549254] cloud-init[923]: ci-info: +--------+------+----------------------------+---------------+-------+-------------------+         Starting iSCSI initiator daemon (iscsid)...

[   97.557931] cloud-init[923]: ci-info: +++++++++++++++++++++++++++++Route IPv4 info+++++++++++++++++++++++++++++
[   97.569483] cloud-init[923]: ci-info: +-------+-------------+-------------+---------------+-----------+-------+
[   97.575302] cloud-init[923]: ci-info: | Route | Destination |   Gateway   |    Genmask    | Interface | Flags |
[   97.579340] cloud-init[923]: ci-info: +-------+-------------+-------------+---------------+-----------+-------+
[   97.583365] cloud-init[923]: ci-info: |   0   |   0.0.0.0   | 172.31.16.1 |    0.0.0.0    |    eth0   |   UG  |
[   97.587524] cloud-init[923]: ci-info: |   1   | 172.31.16.0 |   0.0.0.0   | 255.255.240.0 |    eth0   |   U   |
[   97.591777] cloud-init[923]: ci-info: +-------+-------------+-------------+---------------+-----------+-------+
[[0;32m  OK  [0m] Started iSCSI initiator daemon (iscsid).
         Starting Login to default iSCSI targets...
[[0;32m  OK  [0m] Started Login to default iSCSI targets.
[[0;32m  OK  [0m] Reached target Remote File Systems (Pre).
[[0;32m  OK  [0m] Reached target Remote File Systems.
Welcome to emergency mode! After logging in, type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or ^D to
try again to boot into default mode.
Give root password for maintenance
(or press Control-D to continue): 

Parece que a intervenção do usuário é necessária (não sei por que).

Eu tentei separar o volume e anexá-lo a outra instância, mas a outra instância também se recusou a inicializar com um problema semelhante. Então, acho que o problema está relacionado a esse volume.

Posso perguntar o que realmente está acontecendo e como me meti nessa situação?

Como devo proceder?

Isso está relacionado apenas ao Ubuntu? Apenas iniciei um Amazon Linux e um volume anexado, aqui pelo menos eu posso montá-lo.