-- Reboot --
Aug 22 16:16:56 localhost systemd-udevd[243]: RUN{builtin}: 'uaccess' unknown /usr/lib64/udev/rules.d/73-seat-late.rules:15
Aug 22 16:16:57 localhost systemd-udevd[243]: RUN{builtin}: 'uaccess' unknown /usr/lib64/udev/rules.d/73-seat-late.rules:15
Aug 22 16:16:57 localhost kernel: megaraid_sas 0000:01:00.0: Init cmd success
Aug 22 16:16:57 localhost kernel: megaraid_sas 0000:01:00.0: INIT adapter done
Aug 22 16:16:58 localhost systemd-fsck[933]: fsck failed with error code 8.
Aug 22 16:16:58 loadbal1 systemd-udevd[1077]: RUN{builtin}: 'uaccess' unknown /usr/lib64/udev/rules.d/73-seat-late.rules:15
Aug 22 16:16:59 loadbal1 systemd[1]: dev-disk-by\x2dlabel-USR\x2dA.device: Dev dev-disk-by\x2dlabel-USR\x2dA.device appeared twice with different sysfs paths /sys/devices/pci0000
Aug 22 16:16:59 loadbal1 systemd-networkd[1431]: [/etc/systemd/network/00-eno1.network:8] Failed to parse boolean value, ignoring: 9000
Aug 22 16:17:00 loadbal1 systemd[1]: dev-disk-by\x2dlabel-USR\x2dA.device: Dev dev-disk-by\x2dlabel-USR\x2dA.device appeared twice with different sysfs paths /sys/devices/pci0000
Aug 22 16:17:00 loadbal1 systemd[1]: Failed to start Load cloud-config from /var/lib/coreos-install/user_data.
-- Subject: Unit user-cloudinit@var-lib-coreos\x2dinstall-user_data.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit user-cloudinit@var-lib-coreos\x2dinstall-user_data.service has failed.
-- 
-- The result is failed.
Aug 22 16:17:04 loadbal1 systemd-udevd[1077]: RUN{builtin}: 'uaccess' unknown /usr/lib64/udev/rules.d/73-seat-late.rules:15
Aug 22 16:17:07 loadbal1 etcd2[4161]: failed to write c024db3206d5ed58 on pipeline (dial tcp 10.91.119.198:2380: i/o timeout)
Aug 22 16:17:44 loadbal1 systemd[1]: dev-disk-by\x2dlabel-USR\x2dA.device: Dev dev-disk-by\x2dlabel-USR\x2dA.device appeared twice with different sysfs paths /sys/devices/pci0000
Aug 22 16:17:44 loadbal1 systemd[1]: dev-disk-by\x2dlabel-USR\x2dA.device: Dev dev-disk-by\x2dlabel-USR\x2dA.device appeared twice with different sysfs paths /sys/devices/pci0000
Aug 22 16:18:03 loadbal1 systemd[4346]: user@1000.service: Failed at step PAM spawning /usr/lib/systemd/systemd: Operation not permitted
-- Subject: Process /usr/lib/systemd/systemd could not be executed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- The process /usr/lib/systemd/systemd could not be executed and failed.
-- 
-- The error number returned by this process is 1.

$ sudo coreos-cloudinit -validate --from-file /var/lib/coreos-install/user_data
2016/08/22 17:47:08 Checking availability of "local-file"
2016/08/22 17:47:08 Fetching user-data from datasource of type "local-file"
2016/08/22 17:47:08 line 354: error: found a tab character where an intendation space is expected
2016/08/22 17:47:08 line 0: warning: incorrect type for "" (want struct)

$ uname -a
Darwin alais.local 15.6.0 Darwin Kernel Version 15.6.0

$ docker run -it --rm alpine uname -a
Linux f55a4140d14f 4.4.15-moby

Kernel command line: cloud-config-url=http://example.com/user_data. You can find this string using this command cat /proc/cmdline. Usually used in PXE or iPXE boots.