I also have same problem on Fedora 30 after upgrade:
# systemctl restart docker.service
Failed to restart docker.service: Unit -.mount is masked.
# systemctl status -- -.mount
● -.mount - Root Mount
Loaded: masked (Reason: Unit -.mount is masked.)
Active: active (mounted) since Fri 2019-05-10 17:43:48 MSK; 2h 33min ago
Where: /
What: /dev/nvme0n1p6
Tasks: 0 (limit: 4915)
Memory: 0B
CGroup: /system.slice/-.mount
Warning: Journal has been rotated since unit was started. Log output is
incomplete or unavailable.
# systemctl cat -- -.mount
# Unit -.mount is masked.
# systemctl show -- -.mount
Where=/
What=/dev/nvme0n1p6
Options=rw,relatime,ssd,space_cache,subvolid=257,subvol=/root
Type=btrfs
TimeoutUSec=1min 30s
ControlPID=0
DirectoryMode=0755
SloppyOptions=no
LazyUnmount=no
ForceUnmount=no
Result=success
UID=[not set]
GID=[not set]
Slice=system.slice
ControlGroup=/system.slice/-.mount
MemoryCurrent=0
CPUUsageNSec=[not set]
TasksCurrent=0
IPIngressBytes=18446744073709551615
IPIngressPackets=18446744073709551615
IPEgressBytes=18446744073709551615
IPEgressPackets=18446744073709551615
Delegate=no
CPUAccounting=no
CPUWeight=[not set]
StartupCPUWeight=[not set]
CPUShares=[not set]
StartupCPUShares=[not set]
CPUQuotaPerSecUSec=infinity
IOAccounting=no
IOWeight=[not set]
StartupIOWeight=[not set]
BlockIOAccounting=no
BlockIOWeight=[not set]
StartupBlockIOWeight=[not set]
MemoryAccounting=yes
MemoryMin=0
MemoryLow=0
MemoryHigh=infinity
MemoryMax=infinity
MemorySwapMax=infinity
MemoryLimit=infinity
DevicePolicy=auto
TasksAccounting=yes
TasksMax=4915
IPAccounting=no
UMask=0022
LimitCPU=infinity
LimitCPUSoft=infinity
LimitFSIZE=infinity
LimitFSIZESoft=infinity
LimitDATA=infinity
LimitDATASoft=infinity
LimitSTACK=infinity
LimitSTACKSoft=8388608
LimitCORE=infinity
LimitCORESoft=infinity
LimitRSS=infinity
LimitRSSSoft=infinity
LimitNOFILE=524288
LimitNOFILESoft=1024
LimitAS=infinity
LimitASSoft=infinity
LimitNPROC=127460
LimitNPROCSoft=127460
LimitMEMLOCK=65536
LimitMEMLOCKSoft=65536
LimitLOCKS=infinity
LimitLOCKSSoft=infinity
LimitSIGPENDING=127460
LimitSIGPENDINGSoft=127460
LimitMSGQUEUE=819200
LimitMSGQUEUESoft=819200
LimitNICE=0
LimitNICESoft=0
LimitRTPRIO=0
LimitRTPRIOSoft=0
LimitRTTIME=infinity
LimitRTTIMESoft=infinity
OOMScoreAdjust=0
Nice=0
IOSchedulingClass=0
IOSchedulingPriority=0
CPUSchedulingPolicy=0
CPUSchedulingPriority=0
TimerSlackNSec=50000
CPUSchedulingResetOnFork=no
NonBlocking=no
StandardInput=null
StandardInputData=
StandardOutput=null
StandardError=inherit
TTYReset=no
TTYVHangup=no
TTYVTDisallocate=no
SyslogPriority=30
SyslogLevelPrefix=yes
SyslogLevel=6
SyslogFacility=3
LogLevelMax=-1
LogRateLimitIntervalUSec=0
LogRateLimitBurst=0
SecureBits=0
CapabilityBoundingSet=cap_chown cap_dac_override cap_dac_read_search cap_fowner
cap_fsetid cap_kill cap_setgid cap_setuid cap_setpcap cap_linux_immutable
cap_net_bind_service cap_net_broadcast cap_net_admin cap_net_raw cap_ipc_lock
cap_ipc_owner cap_sys_module cap_sys_rawio cap_sys_chroot cap_sys_ptrace
cap_sys_pacct cap_sys_admin cap_sys_boot cap_sys_nice cap_sys_resource
cap_sys_time cap_sys_tty_config cap_mknod cap_lease cap_audit_write
cap_audit_control cap_setfcap cap_mac_override cap_mac_admin cap_syslog
cap_wake_alarm cap_block_suspend
AmbientCapabilities=
DynamicUser=no
RemoveIPC=no
MountFlags=
PrivateTmp=no
PrivateDevices=no
ProtectKernelTunables=no
ProtectKernelModules=no
ProtectControlGroups=no
PrivateNetwork=no
PrivateUsers=no
PrivateMounts=no
ProtectHome=no
ProtectSystem=no
SameProcessGroup=yes
UtmpMode=init
IgnoreSIGPIPE=yes
NoNewPrivileges=no
SystemCallErrorNumber=0
LockPersonality=no
RuntimeDirectoryPreserve=no
RuntimeDirectoryMode=0755
StateDirectoryMode=0755
CacheDirectoryMode=0755
LogsDirectoryMode=0755
ConfigurationDirectoryMode=0755
MemoryDenyWriteExecute=no
RestrictRealtime=no
RestrictSUIDSGID=no
RestrictNamespaces=no
MountAPIVFS=no
KeyringMode=shared
KillMode=control-group
KillSignal=15
FinalKillSignal=9
SendSIGKILL=yes
SendSIGHUP=no
WatchdogSignal=6
Id=-.mount
Names=-.mount
RequiredBy=systemd-rfkill.socket openvpn-client@alo-taskdata.service
local-fs.target systemd-backlight@backlight:intel_backlight.service
logrotate.timer systemd-ask-password-console.path dm-event.socket
unbound-anchor.timer cups.path docker.socket
systemd-backlight@leds:tpacpi::kbd_backlight.service dbus.socket
sys-kernel-config.mount systemd-initctl.socket logrotate.service
chronyd.service systemd-random-seed.service snapd.socket
proc-sys-fs-binfmt_misc.mount dbus-broker.service systemd-coredump.socket
proc-sys-fs-binfmt_misc.automount systemd-journald.socket
systemd-machined.service systemd-update-utmp.service basic.target
systemd-journald-dev-log.socket systemd-timesyncd.service cups.socket
systemd-ask-password-wall.path systemd-rfkill.service
systemd-journal-flush.service
dev-disk-by\x2duuid-b1b87364\x2d8018\x2d45c9\x2da0b4\x2db0b21e75afd2.swap
mlocate-updatedb.timer sssd-kcm.socket
var-lib-snapd-snap-hello\x2dworld-27.mount lvm2-lvmpolld.socket
virtlockd.socket rpcbind.socket rpcbind.service virtlogd.socket
dev-hugepages.mount avahi-daemon.socket sys-fs-fuse-connections.mount
var-lib-snapd-snap-core-6673.mount virtlogd-admin.socket
systemd-ask-password-plymouth.path systemd-udevd-control.socket
dev-mqueue.mount sys-kernel-debug.mount mlocate-updatedb.service syslog.socket
rtkit-daemon.service virtlockd-admin.socket lvm2-lvmetad.socket
var-lib-snapd-snap-redis\x2ddesktop\x2dmanager-191.mount
systemd-update-utmp-runlevel.service ModemManager.service bluetooth.service
Before=basic.target dbus-broker.service systemd-update-utmp.service
virtlockd-admin.socket dbus.socket mlocate-updatedb.timer dev-mqueue.mount
systemd-journald-dev-log.socket systemd-update-utmp-runlevel.service
openvpn-client@alo-taskdata.service rtkit-daemon.service virtlogd-admin.socket
bluetooth.service logrotate.service sys-kernel-debug.mount docker.socket
ModemManager.service virtlockd.socket
var-lib-snapd-snap-hello\x2dworld-27.mount syslog.socket dev-hugepages.mount
systemd-backlight@backlight:intel_backlight.service sssd-kcm.socket
mlocate-updatedb.service systemd-ask-password-wall.path
dev-disk-by\x2duuid-b1b87364\x2d8018\x2d45c9\x2da0b4\x2db0b21e75afd2.swap
lvm2-lvmpolld.socket proc-sys-fs-binfmt_misc.mount
systemd-ask-password-console.path rpcbind.service
proc-sys-fs-binfmt_misc.automount logrotate.timer sys-fs-fuse-connections.mount
virtlogd.socket ostree-remount.service systemd-udevd-control.socket
var-lib-snapd-snap-core-6673.mount systemd-journald.socket
systemd-timesyncd.service snapd.socket rpcbind.socket
systemd-random-seed.service avahi-daemon.socket systemd-initctl.socket
systemd-coredump.socket sys-kernel-config.mount
systemd-backlight@leds:tpacpi::kbd_backlight.service systemd-rfkill.service
cups.socket lvm2-lvmetad.socket unbound-anchor.timer systemd-rfkill.socket
var-lib-snapd-snap-redis\x2ddesktop\x2dmanager-191.mount cups.path
systemd-journal-flush.service systemd-machined.service
systemd-ask-password-plymouth.path dm-event.socket chronyd.service
Description=Root Mount
LoadState=masked
ActiveState=active
SubState=mounted
FragmentPath=/dev/null
UnitFileState=masked-runtime
StateChangeTimestamp=Fri 2019-05-10 14:43:50 MSK
StateChangeTimestampMonotonic=4127865
InactiveExitTimestamp=Fri 2019-05-10 17:43:48 MSK
InactiveExitTimestampMonotonic=1949529
ActiveEnterTimestamp=Fri 2019-05-10 17:43:48 MSK
ActiveEnterTimestampMonotonic=1949529
ActiveExitTimestampMonotonic=0
InactiveEnterTimestampMonotonic=0
CanStart=no
CanStop=no
CanReload=yes
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=no
OnFailureJobMode=replace
IgnoreOnIsolate=yes
NeedDaemonReload=no
JobTimeoutUSec=infinity
JobRunningTimeoutUSec=infinity
JobTimeoutAction=none
ConditionResult=no
AssertResult=no
ConditionTimestampMonotonic=0
AssertTimestampMonotonic=0
LoadError=org.freedesktop.systemd1.UnitMasked "Unit -.mount is masked."
Transient=no
Perpetual=yes
StartLimitIntervalUSec=10s
StartLimitBurst=5
StartLimitAction=none
FailureAction=none
FailureActionExitStatus=-1
SuccessAction=none
SuccessActionExitStatus=-1
CollectMode=inactive
# rpm -q docker-ce
docker-ce-18.09.6-3.fc29.x86_64
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https://bugs.launchpad.net/bugs/1827010
Title:
Docker does not start
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