dmesg reads the Kernel log ring buffer. It doesn’t do timestamps. What you should do is configure syslog to grab the kernel logs from that buffer and send them to a file (if it isn’t already set to do so). Note, default CentOS 5.x syslog config sends kernel logs to /var/log/messages, as I recall. If … Read more
Understanding dmesg timestamp is pretty simple: it is time in seconds since the kernel started. So, having time of startup (uptime), you can add up the seconds and show them in whatever format you like. Or better, you could use the -T command line option of dmesg and parse the human readable format. From the … Read more
Disable the [HAVE_PERF_EVENTS] kernel option and recompile the Linux kernel.
sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error – auto reallocate failed Looks like the drive has bad sectors and is unable to reallocate these (possibly because it’s run out of spare sectors). The output of smartctl -a /dev/sda would give you more information on the state of the drive.
To verify your theory (which, by the way, is sound), execute the following as root: hwclock –show This will show you your hardware clock on the server you are executing the command. To synchronise your hardware clock with your system-time (which is managed by ntp), run the following command: hwclock –systohc –utc The last argument … Read more
dmesg displays what is in the kernel buffer, whereas logger is for syslogd. I think if you want to print things into the kernel buffer you will need to create a driver that uses the printk() kernel function. If you just want it in /var/log/messages, then with a “normal” setup I think what you have … Read more
It looks as if it was implemented recently for Quantal (12.10) : see http://brainstorm.ubuntu.com/idea/17829/ . Basically, dmesg is reported to have a new switch -T, –ctime. Edit. As another extension on Ignacio’s answer, here are some scripts to enhance dmesg output on older systems. ( Note: for the python version of the code shown there, … Read more