命令 dmesg
描述 print or control the kernel ring buffer 查看系统内核日志
用法
选项 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Options: -C 清除日志缓存 -c 读取并清除所有日志 -H 以可读形式显示 -k 显示内核日志 -L 显示颜色 -l 显示指定级别的日志,日志级别如下 -T 显示可读的时间戳,可能不准确 -t 不显示时间戳 -u 显示用户空间日志 -w 追加显示新日志 -x 显示详细的日志信息 日志级别 emerg - system is unusable alert - action must be taken immediately crit - critical conditions err - error conditions warn - warning conditions notice - normal but significant condition info - informational debug - debug-level messages
注意 无
示例 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 $ dmesg -l err [ 1.168998] sd 2:0:0:0: [sda] Assuming drive cache: write through [ 2.701990] piix4_smbus 0000:00:07.3: SMBus Host Controller not enabled! $ dmesg -x |head kern :info : [ 0.000000] Initializing cgroup subsys cpuset kern :info : [ 0.000000] Initializing cgroup subsys cpu kern :info : [ 0.000000] Initializing cgroup subsys cpuacct kern :notice: [ 0.000000] Linux version 3.10.0-1160.11.1.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ) kern :info : [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.10.0-1160.11.1.el7.x86_64 root=/dev/mapper/centos-root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap biosdevname=0 net.ifnames=0 rhgb quiet LANG=en_US.UTF-8 kern :info : [ 0.000000] Disabled fast string operations ... $ dmesg |grep sda [ 1.168921] sd 2:0:0:0: [sda] 41943040 512-byte logical blocks: (21.4 GB/20.0 GiB) [ 1.168945] sd 2:0:0:0: [sda] Write Protect is off [ 1.168947] sd 2:0:0:0: [sda] Mode Sense: 61 00 00 00 [ 1.168996] sd 2:0:0:0: [sda] Cache data unavailable [ 1.168998] sd 2:0:0:0: [sda] Assuming drive cache: write through [ 1.169937] sda: sda1 sda2 [ 1.170157] sd 2:0:0:0: [sda] Attached SCSI disk [ 2.845189] XFS (sda1): Mounting V5 Filesystem [ 2.877457] XFS (sda1): Ending clean mount $ dmesg |grep XFS [ 1.510339] SGI XFS with ACLs, security attributes, no debug enabled [ 1.513852] XFS (dm-0): Mounting V5 Filesystem [ 1.523018] XFS (dm-0): Ending clean mount [ 2.845189] XFS (sda1): Mounting V5 Filesystem [ 2.877457] XFS (sda1): Ending clean mount $ dmesg |grep Memory [ 0.000000] Memory: 2004084k/2097152k available (7788k kernel code, 524k absent, 92544k reserved, 5954k data, 1984k init) [ 0.117670] x86/mm: Memory block size: 128MB $ dmesg |grep Network [ 0.957434] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI [ 1.346108] e1000 0000:02:00.0 eth0: Intel(R) PRO/1000 Network Connection $ dmesg |grep cpu