what just happened (time went backwards?)

[Chris Murphy]

On Feb 25, 2014, at 11:58 AM, Dale Dellutri <daledellutri at gmail.com> wrote:

> On Tue, Feb 25, 2014 at 12:30 PM, Neal Becker <ndbecker2 at gmail.com> wrote:
> This f20 server has been running just fine for months.  Today it became
> unresponsive.  Couldn't ssh into it (ping ok).  Not thrashing disk (disk light
> not continuously on).
> 
> I hit the power button and rebooted.  After reboot, checked /var/log/messages:
> 
> Feb 25 12:06:18 nbecker7 kernel: [   49.667251] tun: Universal TUN/TAP device
> driver, 1.6
> Feb 25 12:06:18 nbecker7 kernel: [   49.667254] tun: (C) 1999-2004 Max
> Krasnyansky <maxk at qualcomm.com>
> Feb 25 12:06:18 nbecker7 kernel: [   59.015938] Ebtables v2.0 registered
> Feb 25 12:06:18 nbecker7 kernel: [   59.601221] ip6_tables: (C) 2000-2006
> Netfilter Core Team
> Feb 25 12:06:18 nbecker7 kernel: [   65.646938] Bridge firewalling registered
> Feb 25 12:06:18 nbecker7 kernel: [   65.671316] device virbr0-nic entered
> promiscuous mode
> Feb 25 12:06:18 nbecker7 kernel: [   66.410670] virbr0: port 1(virbr0-nic)
> entered listening state
> Feb 25 12:06:18 nbecker7 kernel: [   66.410678] virbr0: port 1(virbr0-nic)
> entered listening state
> Feb 25 12:06:18 nbecker7 kernel: [   66.410724] IPv6: ADDRCONF(NETDEV_UP):
> virbr0: link is not ready
> Feb 25 12:06:18 nbecker7 kernel: [   66.668588] virbr0: port 1(virbr0-nic)
> entered disabled state
> Feb 25 12:06:54 nbecker7 kernel: [  109.855407] fuse init (API version 7.22)
> Jan  8 10:48:32 nbecker7 systemd: Stopped target Graphical Interface.
> Jan  8 10:48:32 nbecker7 systemd: Stopping Multi-User System.
> Jan  8 10:48:32 nbecker7 systemd: Stopped target Multi-User System.
> Jan  8 10:48:32 nbecker7 systemd: Stopping ABRT kernel log watcher...
> Jan  8 10:48:32 nbecker7 systemd: Stopping Command Scheduler...
> Jan  8 10:48:32 nbecker7 systemd: Stopping Install ABRT coredump hook...
> Jan  8 10:48:32 nbecker7 systemd: Stopping ABRT Xorg log watcher...
> Jan  8 10:48:32 nbecker7 systemd: Stopping OpenSSH server daemon...
> 
> How did the date just become Jan 8??
> 
> It didn't.  Systemd is in control, and /var/log/messages is no longer necessarily
> written in order.  You need to use journalctl to read the log for F20.

Ahh I didn't pick up on these being from messages. 

journalctl -b  --no-pager     # for the current boot
journalctl -b -1 --no-pager  # for the boot before current, -2 for the one before that, -3, -4, etc.

To get more information
journalctl -xb

It can also be piped

journalctl -b -1 | grep -i time

systemd itself doesn't manage or change time.


Chris Murphy

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