Docs/SysAdmin/CLI/SystemLogs

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System Logs

Where to look when something is not working

Contents


System logs

Use dmesg to check if the system displays an error. To see the full list of messages, you can go to /var/log/ and look at syslog and messages.

To get informations interactively about your system, look at /proc/ directory, as for instance /proc/cmdline, /proc/cpuinfo, ....

To watch interactively, do as root:

  1. type in a console: tail -f /var/log/messages
  2. execute the action causing a problem (for instance plugging your USB key)
  3. watch if some information is displayed in the console (hardware detection, warnings, ...)
  4. in case of trouble, copy/paste the resulting log.

Daemon system logs

Go to /var/log/daemons and look at errors/info/warnings files.

Kernel system logs

Go to /var/log/kernel and look at errors/info/warnings files.

Correct log files

USB keys

Jun  6 10:49:14 robbie kernel: usb 4-6: new high speed USB device using ehci_hcd and address 2
Jun  6 10:49:15 robbie kernel: SCSI subsystem initialized
Jun  6 10:49:15 robbie kernel: Initializing USB Mass Storage driver...
Jun  6 10:49:15 robbie kernel: scsi0 : SCSI emulation for USB Mass Storage devices
Jun  6 10:49:15 robbie kernel: usbcore: registered new driver usb-storage
Jun  6 10:49:15 robbie kernel: USB Mass Storage support registered.
Jun  6 10:49:20 robbie kernel:   Vendor: SWISSBIT  Model: Twist             Rev: 2.00
Jun  6 10:49:20 robbie kernel:   Type:   Direct-Access                      ANSI SCSI revision: 02
Jun  6 10:49:20 robbie scsi.agent[10174]: disk at /devices/pci0000:00/0000:00:10.3/usb4/4-6/4-6:1.0/host0/target0:0:0/0:0:0:0
Jun  6 10:49:20 robbie kernel: sda: Unit Not Ready, sense:
Jun  6 10:49:20 robbie kernel: : Current: sense key: Unit Attention
Jun  6 10:49:20 robbie kernel:     Additional sense: Not ready to ready change, medium may have changed
Jun  6 10:49:20 robbie kernel: sda : READ CAPACITY failed.
Jun  6 10:49:20 robbie kernel: sda : status<tt>1, message</tt>00, host<tt>0, driver</tt>08
Jun  6 10:49:20 robbie kernel: sd: Current: sense key: Unit Attention
Jun  6 10:49:20 robbie kernel:     Additional sense: Not ready to ready change, medium may have changed
Jun  6 10:49:20 robbie kernel: sda: test WP failed, assume Write Enabled
Jun  6 10:49:20 robbie kernel: sda: assuming drive cache: write through
Jun  6 10:49:20 robbie kernel: SCSI device sda: 126720 512-byte hdwr sectors (65 MB)
Jun  6 10:49:20 robbie kernel: sda: Write Protect is off
Jun  6 10:49:20 robbie kernel: sda: assuming drive cache: write through
Jun  6 10:49:20 robbie kernel:  /dev/scsi/host0/bus0/target0/lun0: p1
Jun  6 10:49:20 robbie kernel: Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
Jun  6 10:49:21 robbie fstab-sync[10211]: added mount point /mnt/removable for /dev/sda
Jun  6 10:49:21 robbie fstab-sync[10224]: added mount point /mnt/removable1 for /dev/sda1

At the beginning the hardware is detected (message kernel: usb...), scsi.agent describes it for the system, fstab-sync mounts the device and renders it available to the system.

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