Linux – Amazon AWS EC2 Volume issue prevents instance access via SSH

amazon ec2amazon-web-serviceslinuxredhat-enterprise-linuxUbuntu

I have an Amazon EC2 Ubuntu t2.nano at sa-east-1 region. It was running fine until 2017-06-14 maintenance.

Today, while trying to access it via ssh, I've noted it was not possible. I get ssh connection refused. Then I moved to aws console and looked two things:

Instance Screenshot:

enter image description here

and System Log (partly shown below):

[    5.500346] systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
         Starting Monitoring of LVM2 mirrors... dmeventd or progress polling...
[    5.513090] systemd[1]: Reached target Encrypted Volumes.
[[0;32m  OK  [0m] Reached target Encrypted Volumes.
[    5.519554] systemd[1]: Listening on Journal Audit Socket.
[[0;32m  OK  [0m] Listening on Journal Audit Socket.
[    5.527501] systemd[1]: Starting Journal Service...
         Starting Journal Service...
[    5.533351] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[    5.540655] Loading iSCSI transport class v2.0-870.
[[0;32m  OK  [0m] Set up automount Arbitrary Executab...ats File System Automount Point.
[    5.551818] systemd[1]: Mounted Debug File System.
[[0;32m  OK  [0m] Mounted Debug File System.
[    5.559413] systemd[1]: Mounted Huge Pages File System.
[[0;32m  OK  [0m] Mounted Huge Pages File System.
[    5.567656] systemd[1]: Mounted POSIX Message Queue File System.
[[0;32m  OK  [0m] [    5.573542] iscsi: registered transport (tcp)
Mounted POSIX Message Queue File System.
[    5.578385] systemd[1]: Started Set console keymap.
[[0;32m  OK  [0m] Started Set console keymap.
[    5.587286] systemd[1]: Started Create list of required static device nodes for the current kernel.
[[0;32m  OK  [0m] Started Create list of required sta...ce nodes for the current kernel.
[    5.600884] systemd[1]: Started Uncomplicated firewall.
[[0;32m  OK  [0m] Started Uncomplicated firewall.
[    5.607939] systemd[1]: Started Remount Root and Kernel File Systems.
[[0;32m  OK  [0m] Started Remount Root and Kernel File Systems.
[    5.627380] systemd[1]: Started Nameserver information manager.
[[0;32m  OK  [0m[    5.635695] iscsi: registered transport (iser)
] Started Nameserver information manager.
[    5.642535] systemd[1]: Started Load Kernel Modules.
[[0;32m  OK  [0m] Started Load Kernel Modules.
[    5.660181] systemd[1]: Started Journal Service.
[[0;32m  OK  [0m] Started Journal Service.
         Starting Apply Kernel Variables...
         Mounting FUSE Control File System...
[[0;32m  OK  [0m] Started LVM2 metadata daemon.
         Starting Flush Journal to Persistent Storage...
         Starting Initial cloud-init job (pre-networking)...
         Starting udev Coldplug all Devices...
         Starting Load/Save Random Seed...
         Starting Create Static Device Nodes in /dev...
[[0;32m  OK  [0m] Mounted FUSE Control File System.
[[0;32m  OK  [0m] Started Apply Kernel Variables.
[[0;32m  OK  [0m] Started Load/Save Random Seed.
[[0;32m  OK  [0m] Started udev Coldplug all Devices.
[[0;32m  OK  [0m] Started Flush Journal to Persistent Storage.
[[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
         Starting udev Kernel Device Manager...
[[0;32m  OK  [0m] Started udev Kernel Device Manager.
[[0;32m  OK  [0m] Started Dispatch Password Requests to Console Directory Watch.
[[0;32m  OK  [0m] Started Monitoring of LVM2 mirrors,...ng dmeventd or progress polling.
[[0;32m  OK  [0m] Reached target Local File Systems (Pre).
[[0;32m  OK  [0m] Found device /dev/ttyS0.
[[0;32m  OK  [0m] Found device /sys/subsystem/net/devices/eth0.
[[0;32m  OK  [0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[    8.686223] cloud-init[415]: Cloud-init v. 0.7.8 running 'init-local' at Thu, 15 Jun 2017 13:02:25 +0000. Up 8.20 seconds.
[[0;32m  OK  [0m] Started Initial cloud-init job (pre-networking).
[[0;32m  OK  [0m] Reached target Network (Pre).
[[0m[0;31m*     [0m] A start job is running for dev-xvdf.device (8s / 1min 30s)
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[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for dev-xvdf.device (1min 14s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 14s / 1min 30s)
[K[     [0;31m*[0m] A start job is running for dev-xvdf.device (1min 15s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 15s / 1min 30s)
[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for dev-xvdf.device (1min 16s / 1min 30s)
[K[  [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for dev-xvdf.device (1min 16s / 1min 30s)
[K[ [0;31m*[0;1;31m*[0m[0;31m*  [0m] A start job is running for dev-xvdf.device (1min 17s / 1min 30s)
[K[[0;31m*[0;1;31m*[0m[0;31m*   [0m] A start job is running for dev-xvdf.device (1min 17s / 1min 30s)
[K[[0;1;31m*[0m[0;31m*    [0m] A start job is running for dev-xvdf.device (1min 18s / 1min 30s)
[K[[0m[0;31m*     [0m] A start job is running for dev-xvdf.device (1min 18s / 1min 30s)
[K[[0;1;31m*[0m[0;31m*    [0m] A start job is running for dev-xvdf.device (1min 19s / 1min 30s)
[K[[0;31m*[0;1;31m*[0m[0;31m*   [0m] A start job is running for dev-xvdf.device (1min 19s / 1min 30s)
[K[ [0;31m*[0;1;31m*[0m[0;31m*  [0m] A start job is running for dev-xvdf.device (1min 20s / 1min 30s)
[K[  [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for dev-xvdf.device (1min 20s / 1min 30s)
[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for dev-xvdf.device (1min 21s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 21s / 1min 30s)
[K[     [0;31m*[0m] A start job is running for dev-xvdf.device (1min 22s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 22s / 1min 30s)
[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for dev-xvdf.device (1min 23s / 1min 30s)
[K[  [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for dev-xvdf.device (1min 23s / 1min 30s)
[K[ [0;31m*[0;1;31m*[0m[0;31m*  [0m] A start job is running for dev-xvdf.device (1min 24s / 1min 30s)
[K[[0;31m*[0;1;31m*[0m[0;31m*   [0m] A start job is running for dev-xvdf.device (1min 24s / 1min 30s)
[K[[0;1;31m*[0m[0;31m*    [0m] A start job is running for dev-xvdf.device (1min 25s / 1min 30s)
[K[[0m[0;31m*     [0m] A start job is running for dev-xvdf.device (1min 25s / 1min 30s)
[K[[0;1;31m*[0m[0;31m*    [0m] A start job is running for dev-xvdf.device (1min 26s / 1min 30s)
[K[[0;31m*[0;1;31m*[0m[0;31m*   [0m] A start job is running for dev-xvdf.device (1min 26s / 1min 30s)
[K[ [0;31m*[0;1;31m*[0m[0;31m*  [0m] A start job is running for dev-xvdf.device (1min 27s / 1min 30s)
[K[  [0;31m*[0;1;31m*[0m[0;31m* [0m] A start job is running for dev-xvdf.device (1min 27s / 1min 30s)
[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job is running for dev-xvdf.device (1min 28s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 28s / 1min 30s)
[K[     [0;31m*[0m] A start job is running for dev-xvdf.device (1min 29s / 1min 30s)
[K[    [0;31m*[0;1;31m*[0m] A start job is running for dev-xvdf.device (1min 29s / 1min 30s)
[K[[0;1;31m TIME [0m] Timed out waiting for device dev-xvdf.device.
[[0;1;33mDEPEND[0m] Dependency failed for /mnt/xvdf.
[[0;1;33mDEPEND[0m] Dependency failed for Local File Systems.
         Starting Set console font and keymap...
[[0;32m  OK  [0m] Stopped getty on tty2-tty6 if dbus and logind are not available.
[[0;32m  OK  [0m] Stopped Getty on tty1.
[[0;32m  OK  [0m] Stopped Daily apt activities.
[[0;32m  OK  [0m] Closed Unix socket for apport crash forwarding.
[[0;32m  OK  [0m] Stopped Trigger resolvconf update for networkd DNS.
[[0;32m  OK  [0m] Stopped Daily Cleanup of Temporary Directories.
[[0;32m  OK  [0m] Closed UUID daemon activation socket.
[[0;32m  OK  [0m] Stopped Execute cloud user/final scripts.
[[0;32m  OK  [0m] Stopped Apply the settings specified in cloud-config.
[[0;32m  OK  [0m] Closed ACPID Listen Socket.
[[0;32m  OK  [0m] Stopped target Graphical Interface.
[[0;32m  OK  [0m] Stopped target Multi-User System.
[[0;32m  OK  [0m] Reached target Cloud-init target.
[[0;32m  OK  [0m] Stopped LSB: daemon to balance interrupts for SMP systems.
[[0;32m  OK  [0m] Stopped D-Bus System Message Bus.
[[0;32m  OK  [0m] Stopped Docker Application Container Engine.
[[0;32m  OK  [0m] Closed Docker Socket for the API.
[[0;32m  OK  [0m] Stopped LSB: MD monitoring daemon.
[[0;32m  OK  [0m] Stopped Terminate Plymouth Boot Screen.
[[0;32m  OK  [0m] Stopped LXD - container startup/shutdown.
[[0;32m  OK  [0m] Stopped System Logging Service.
[[0;32m  OK  [0m] Stopped OpenBSD Secure Shell server.
[[0;32m  OK  [0m] Stopped Pollinate to seed the pseudo random number generator.
[[0;32m  OK  [0m] Stopped LSB: Set the CPU Frequency Scaling governor to "ondemand".
[[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): 

It seems user intervention is required (not sure why).

I tried to detach the volume and attach it to another instance but then the other instance also refused to boot with similar issue. So I guess the issue is related to that volume.

May I ask what's really going on and how I got into this situation?

How should I proceed?

Is this related to Ubuntu only? Just started an Amazon Linux and attached volume to it, here at least I can mount it.

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