at_shiita.ishigaki
2021年11月4日 9時13分
カーネルのメッセージログを出力するにはdmesgコマンドを使用します。
[armadillo ~]# dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14-at38 (atmark@atde8) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 Mon Oct 18 17:40:36 JST 2021 [ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: Atmark Techno Armadillo-640 [ 0.000000] Memory policy: Data cache writeback [ 0.000000] cma: Reserved 16 MiB at 0x9f000000 [ 0.000000] On node 0 totalpages: 131072 :省略
出力のレベルを確認するには-xオプションを使用します。
[armadillo ~]# dmesg -x kern :info : [ 0.000000] Booting Linux on physical CPU 0x0 kern :notice: [ 0.000000] Linux version 4.14-at38 (atmark@atde8) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 Mon Oct 18 17:40:36 JST 2021 kern :info : [ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d kern :info : [ 0.000000] CPU: div instructions available: patching division code kern :info : [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache kern :info : [ 0.000000] OF: fdt: Machine model: Atmark Techno Armadillo-640 kern :info : [ 0.000000] Memory policy: Data cache writeback kern :info : [ 0.000000] cma: Reserved 16 MiB at 0x9f000000 kern :debug : [ 0.000000] On node 0 totalpages: 131072 :省略
表示するレベルを指定するには-lオプションを使用します。
指定できるレベルは以下の通りです。
- emerg
- alert
- crit
- err
- warn
- notice
- info
- debug
[armadillo ~]# dmesg -xl notice
kern :notice: [ 0.000000] Linux version 4.14-at38 (atmark@atde8) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 Mon Oct 18 17:40:36 1
kern :notice: [ 0.000000] Kernel command line: root=/dev/mmcblk0p2 rootwait
kern :notice: [ 0.000000] Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xe0800000 - 0xff800000 ( 496 MB)
lowmem : 0xc0000000 - 0xe0000000 ( 512 MB)
.text : 0xc0008000 - 0xc0700000 (7136 kB)
.init : 0xc0900000 - 0xc0c00000 (3072 kB)
.data : 0xc0c00000 - 0xc0c44ae0 ( 275 kB)
.bss : 0xc0c49d84 - 0xc0c86824 ( 243 kB)
kern :notice: [ 0.017312] random: get_random_u32 called from bucket_table_alloc+0x84/0x1a4 with crng_init=0
kern :notice: [ 0.077089] SCSI subsystem initialized
kern :notice: [ 0.493531] NFS: Registering the id_resolver key type
kern :notice: [ 0.493649] Key type id_resolver registered
kern :notice: [ 0.493683] Key type id_legacy registered
kern :notice: [ 2.211258] random: fast init done
kern :notice: [ 2.640374] Key type dns_resolver registered
kern :notice: [ 3.135426] random: systemd-udevd: uninitialized urandom read (16 bytes read)
kern :notice: [ 6.440741] random: systemd: uninitialized urandom read (16 bytes read)
kern :notice: [ 6.467428] random: systemd: uninitialized urandom read (16 bytes read)
kern :notice: [ 6.523143] random: systemd: uninitialized urandom read (16 bytes read)
kern :notice: [ 73.453185] random: crng init done
kern :notice: [ 73.456799] random: 6 urandom warning(s) missed due to ratelimiting