ubuntu服务日志分析——journalctl
简介
对于使用 systemd 服务的 Linux 发行版来说，journalctl 命令提供了详细且经过筛选的日志视图，是获取 Linux 重启历史记录的得力工具
systemd帮助我们记录了系统在运行过程中的所有日志信息，无论是重启前还是重启后，都会有保留。一般情况下， 我们通常到/var/log/xxx.log挨个找日志记录，有时候日志会被压缩，或者日志分配在不同的文件，分析起来很费劲。
systemd提供的journalctl很好的帮助我们解决了以上问题。
常用方法
- 获取boot信息
[ 2023-12-07 10:58:31 ] root@localhost:~# journalctl --list-boots
[ 2023-12-07 10:58:31 ] -3 7846f4280f28422a96645143f1d966ed Thu 2023-12-07 09:58:34 CST—Thu 2023-12-07 10:24:25 CST
[ 2023-12-07 10:58:31 ] -2 b20eb9b7b2964138af04536608a5c712 Tue 2023-12-05 19:56:10 CST—Wed 2023-12-06 09:27:24 CST
[ 2023-12-07 10:58:31 ] -1 70d11f7975854356940968a86a2ba353 Thu 2023-12-07 10:25:58 CST—Thu 2023-12-07 10:44:25 CST
[ 2023-12-07 10:58:31 ] 0 598ad1e7586346c8a25bfc23bded7a6a Thu 2023-12-07 10:45:58 CST—Thu 2023-12-07 10:58:30 CST
- 获取某次boot的日志信息
root@localhost:~# journalctl --boot=70d11f7975854356940968a86a2ba353
-- Logs begin at Tue 2023-12-05 19:56:10 CST, end at Thu 2023-12-07 11:01:06 CST. --
12月 07 10:25:58 localhost kernel: Linux version 5.15.0-56-generic (buildd@lcy02-amd64-102) (gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu)>
12月 07 10:25:58 localhost kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.15.0-56-generic root=/dev/nvme0n1p3 ro console=tty0 console=ttyS0,115200n8 net.ifnames=0 bio>
12月 07 10:25:58 localhost kernel: KERNEL supported cpus:
12月 07 10:25:58 localhost kernel: Intel GenuineIntel
12月 07 10:25:58 localhost kernel: AMD AuthenticAMD
12月 07 10:25:58 localhost kernel: Hygon HygonGenuine
12月 07 10:25:58 localhost kernel: Centaur CentaurHauls
12月 07 10:25:58 localhost kernel: zhaoxin Shanghai
12月 07 10:25:58 localhost kernel: x86/split lock detection: #AC: crashing the kernel on kernel split_locks and warning on user-space split_locks
12月 07 10:25:58 localhost kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
12月 07 10:25:58 localhost kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
12月 07 10:25:58 localhost kernel: x86/fpu: Enabled xstate features 0x3, context size is 576 bytes, using 'compacted' format.
12月 07 10:25:58 localhost kernel: signal: max sigframe size: 1520
12月 07 10:25:58 localhost kernel: BIOS-provided physical RAM map:
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x000000000009f000-0x00000000000fffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000000100000-0x0000000066f1ffff] usable
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000066f20000-0x000000006941ffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000069420000-0x000000006969ffff] ACPI data
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000696a0000-0x000000006979ffff] ACPI NVS
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000697a0000-0x0000000069ffefff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000069fff000-0x0000000069ffffff] usable
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x000000006a000000-0x000000006fbfffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000c0000000-0x00000000cfffffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000fed00000-0x00000000fed00fff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000fed20000-0x00000000fed7ffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
12月 07 10:25:58 localhost kernel: BIOS-e820: [mem 0x0000000100000000-0x00000004903fffff] usable
12月 07 10:25:58 localhost kernel: NX (Execute Disable) protection: active
12月 07 10:25:58 localhost kernel: efi: EFI v2.70 by American Megatrends
12月 07 10:25:58 localhost kernel: efi: ACPI=0x6974a000 ACPI 2.0=0x6974a014 TPMFinalLog=0x6974d000 SMBIOS=0x69d6e000 SMBIOS 3.0=0x69d6d000 MEMATTR=0x644ef318 ESRT=0x660>
12月 07 10:25:58 localhost kernel: efi: seeding entropy pool
12月 07 10:25:58 localhost kernel: random: crng init done
12月 07 10:25:58 localhost kernel: secureboot: Secure boot disabled
12月 07 10:25:58 localhost kernel: SMBIOS 3.3.0 present.
12月 07 10:25:58 localhost kernel: DMI: To be filled by O.E.M To be filled by O.E.M/To be filled by O.E.M, BIOS 5.19 05/25/2023
12月 07 10:25:58 localhost kernel: tsc: Detected 2000.000 MHz processor
12月 07 10:25:58 localhost kernel: tsc: Detected 1996.800 MHz TSC
12月 07 10:25:58 localhost kernel: e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
12月 07 10:25:58 localhost kernel: e820: remove [mem 0x000a0000-0x000fffff] usable
12月 07 10:25:58 localhost kernel: last_pfn = 0x490400 max_arch_pfn = 0x400000000
12月 07 10:25:58 localhost kernel: x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
12月 07 10:25:58 localhost kernel: last_pfn = 0x6a000 max_arch_pfn = 0x400000000
12月 07 10:25:58 localhost kernel: esrt: Reserving ESRT space from 0x000000006609d498 to 0x000000006609d4d0.
12月 07 10:25:58 localhost kernel: e820: update [mem 0x6609d000-0x6609dfff] usable ==> reserved
12月 07 10:25:58 localhost kernel: e820: update [mem 0x6442d000-0x6442dfff] usable ==> reserved
12月 07 10:25:58 localhost kernel: secureboot: Secure boot disabled
12月 07 10:25:58 localhost kernel: RAMDISK: [mem 0x3bd68000-0x3fffdfff]
12月 07 10:25:58 localhost kernel: ACPI: Early table checksum verification disabled
12月 07 10:25:58 localhost kernel: ACPI: RSDP 0x000000006974A014 000024 (v02 ALASKA)
12月 07 10:25:58 localhost kernel: ACPI: XSDT 0x0000000069749728 0000D4 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: FACP 0x000000006969C000 000114 (v06 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: DSDT 0x0000000069654000 047264 (v02 ALASKA A M I 01072009 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: FACS 0x000000006979E000 000040
12月 07 10:25:58 localhost kernel: ACPI: MCFG 0x000000006969D000 00003C (v01 ALASKA A M I 01072009 MSFT 00000097)
12月 07 10:25:58 localhost kernel: ACPI: FIDT 0x0000000069653000 00009C (v01 ALASKA A M I 01072009 AMI 00010013)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x0000000069650000 0025EE (v02 CpuRef CpuSsdt 00003000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x000000006969E000 001CCD (v02 SaSsdt SaSsdt 00003000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x000000006964C000 0032CD (v02 INTEL IgfxSsdt 00003000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: HPET 0x000000006964B000 000038 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: APIC 0x000000006964A000 00012C (v04 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: PRAM 0x0000000069649000 000030 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x0000000069648000 000EF4 (v02 ALASKA Ther_Rvp 00001000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x0000000069645000 002FC0 (v02 INTEL xh_jslv2 00000000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: NHLT 0x0000000069643000 001771 (v00 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: LPIT 0x0000000069642000 000094 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x0000000069640000 000122 (v02 ALASKA TbtTypeC 00000000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: DBGP 0x000000006963F000 000034 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: DBG2 0x000000006963E000 000054 (v00 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x000000006963C000 0015AE (v02 ALASKA UsbCTabl 00001000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: DMAR 0x000000006963B000 000088 (v02 INTEL EDK2 00000002 01000013)
12月 07 10:25:58 localhost kernel: ACPI: SSDT 0x000000006963A000 000144 (v02 Intel ADebTabl 00001000 INTL 20191018)
12月 07 10:25:58 localhost kernel: ACPI: TPM2 0x0000000069639000 00004C (v04 ALASKA A M I 00000001 AMI 00000000)
12月 07 10:25:58 localhost kernel: ACPI: WSMT 0x0000000069641000 000028 (v01 ALASKA A M I 01072009 AMI 00010013)
12月 07 10:25:58 localhost kernel: ACPI: FPDT 0x0000000069638000 000044 (v01 ALASKA A M I 01072009 AMI 01000013)
12月 07 10:25:58 localhost kernel: ACPI: Reserving FACP table memory at [mem 0x6969c000-0x6969c113]
12月 07 10:25:58 localhost kernel: ACPI: Reserving DSDT table memory at [mem 0x69654000-0x6969b263]
12月 07 10:25:58 localhost kernel: ACPI: Reserving FACS table memory at [mem 0x6979e000-0x6979e03f]
12月 07 10:25:58 localhost kernel: ACPI: Reserving MCFG table memory at [mem 0x6969d000-0x6969d03b]
12月 07 10:25:58 localhost kernel: ACPI: Reserving FIDT table memory at [mem 0x69653000-0x6965309b]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x69650000-0x696525ed]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x6969e000-0x6969fccc]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x6964c000-0x6964f2cc]
12月 07 10:25:58 localhost kernel: ACPI: Reserving HPET table memory at [mem 0x6964b000-0x6964b037]
12月 07 10:25:58 localhost kernel: ACPI: Reserving APIC table memory at [mem 0x6964a000-0x6964a12b]
12月 07 10:25:58 localhost kernel: ACPI: Reserving PRAM table memory at [mem 0x69649000-0x6964902f]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x69648000-0x69648ef3]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x69645000-0x69647fbf]
12月 07 10:25:58 localhost kernel: ACPI: Reserving NHLT table memory at [mem 0x69643000-0x69644770]
12月 07 10:25:58 localhost kernel: ACPI: Reserving LPIT table memory at [mem 0x69642000-0x69642093]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x69640000-0x69640121]
12月 07 10:25:58 localhost kernel: ACPI: Reserving DBGP table memory at [mem 0x6963f000-0x6963f033]
12月 07 10:25:58 localhost kernel: ACPI: Reserving DBG2 table memory at [mem 0x6963e000-0x6963e053]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x6963c000-0x6963d5ad]
12月 07 10:25:58 localhost kernel: ACPI: Reserving DMAR table memory at [mem 0x6963b000-0x6963b087]
12月 07 10:25:58 localhost kernel: ACPI: Reserving SSDT table memory at [mem 0x6963a000-0x6963a143]
12月 07 10:25:58 localhost kernel: ACPI: Reserving TPM2 table memory at [mem 0x69639000-0x6963904b]
12月 07 10:25:58 localhost kernel: ACPI: Reserving WSMT table memory at [mem 0x69641000-0x69641027]
12月 07 10:25:58 localhost kernel: ACPI: Reserving FPDT table memory at [mem 0x69638000-0x69638043]
- 持续监控journal日志，再也不用tail -f xxxx文件了
root@localhost:~# journalctl -f
-- Logs begin at Wed 2023-12-06 11:17:50 CST. --
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5816 INFO][api_function.c:1830]API SERVER RECEIVE REQUEST TIME: [16:41:00]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5817 INFO][api_function.c:1830]API SERVER RECEIVE REQUEST TIME: [16:41:00]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1830]API SERVER RECEIVE REQUEST TIME: [16:41:00]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5814 INFO][api_function.c:1830]API SERVER RECEIVE REQUEST TIME: [16:41:00]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5817 INFO][api_function.c:1831]API SERVER RECEIVE REQUEST DATA: [c8 00 00 00 6b 00 7c 7b 22 63 61 6c 6c 5f 62 61 63 6b 5f 6b 65 79 22 3a 22 47 45 54 5f 53 45 4e 53 4f 52 5f 46 41 4e 53 3a 37 37 61 35 32 37 37 38 2d 66 36 30 38 2d 34 32 33 38 2d 62 36 33 63 2d 36 30 39 37 31 64 63 64 37 38 37 38 22 2c 22 64 61 74 61 22 3a 7b 7d 2c 22 74 69 6d 65 5f 6f 75 74 22 3a 33 30 30 30 30 7d c9 ]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1831]API SERVER RECEIVE REQUEST DATA: [c8 00 00 00 69 00 70 7b 22 63 61 6c 6c 5f 62 61 63 6b 5f 6b 65 79 22 3a 22 47 45 54 5f 42 4d 43 5f 49 4e 46 4f 53 3a 64 65 61 30 61 63 38 37 2d 38 35 34 32 2d 34 66 64 32 2d 61 30 37 35 2d 62 36 64 66 61 30 62 64 32 38 35 35 22 2c 22 64 61 74 61 22 3a 7b 7d 2c 22 74 69 6d 65 5f 6f 75 74 22 3a 33 30 30 30 30 7d c9 ]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1832]API SERVER RECEIVE REQUEST FRAME_HEAD: [0xc8]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1833]API SERVER RECEIVE REQUEST FRAME_LENGTH: [105]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1834]API SERVER RECEIVE REQUEST FRAME_TYPE: [0x70]
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1835]API SERVER RECEIVE REQUEST JSON:
{"call_back_key":"GET_BMC_INFOS:dea0ac87-8542-4fd2-a075-b6dfa0bd2855","data":{},"time_out":30000}
// 自定义输出的日志等级
// "alert" (1), "crit" (2), "err" (3), "warning" (4), "notice" (5), "info" (6), "debug" (7)
root@localhost:~# journalctl -f -p 3
-- Logs begin at Wed 2023-12-06 11:17:50 CST. --
12月 06 16:40:56 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 06 16:40:56 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:820]rpc timeout?? result:(nil), closure_data:0x1
12月 06 16:40:56 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 06 16:40:56 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:804]rpc timeout?? result:(nil), closure_data:0x2
12月 06 16:40:56 localhost kernel: hub 2-4.4:1.0: hub_ext_port_status failed (err = -71)
12月 06 16:40:56 localhost kernel: usb 2-4.4-port1: cannot disable (err = -71)
12月 06 16:40:56 localhost kernel: hub 2-4.4:1.0: hub_ext_port_status failed (err = -71)
12月 06 16:40:57 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 06 16:40:57 localhost mgmt[5780]: [5780 : 5786 ERROR][switch_sock.c:693]rpc timeout?? result:(nil), closure_data:0x1
12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5813 ERROR][api_function.c:78]switch 1 rpc timeout
^C
root@localhost:~# 12月 06 16:41:00 localhost api_func_pool_server[5799]: [5799 : 5818 INFO][api_function.c:1833]API SERVER RECEIVE REQUEST FRAME_LENGTH: [105]
- 查看某个服务的日志信息
root@localhost:~# journalctl -u mgmt_stack.service
-- Logs begin at Wed 2023-12-06 11:17:50 CST, end at Thu 2023-12-07 13:41:04 CST. --
12月 07 13:12:30 localhost mgmt[5732]: [5732 : 5852 INFO][mgmt_msg.c:2621]API server cmd [0x8a] completed.
12月 07 13:12:31 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 07 13:12:31 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:873]rpc timeout?? result:(nil), closure_data:0x1
12月 07 13:12:31 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 07 13:12:31 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:741]rpc timeout?? result:(nil), closure_data:0x1
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:376]connect failed. switch_id:10
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 5743 ERROR][switch_sock.c:820]rpc timeout?? result:(nil), closure_data:0x1
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:546]fan-smart: get_back_temp max_temp=28.500000
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:619]fan-smart: get_node_temp temp=22.500000
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:572]fan-smart get_x86_cpu_temp temp=31.000000
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 ERROR][mgmt_fan_smart.c:820]fan-smart: get temp fail! model=node_cpu
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:660]fan-smart: get_card_temp temp=54.799999 db_val=54.8
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:706]fan-smart: get_sw_cpu_temp temp=32.000000 db_val=32
12月 07 13:12:34 localhost mgmt[5732]: [5732 : 6103 INFO][mgmt_fan_smart.c:706]fan-smart: get_sw_cpu_temp temp=32.000000 db_val=
12月 07 13:12:38 localhost mgmt[5732]: [5732 : 6217 INFO][hal_api_gpio.c:456][node 5 card 1 power status]Get Pca9575 Gpio Dir is inp
- 查看内核级信息
root@localhost:~# journalctl -k
-- Logs begin at Wed 2023-12-06 11:17:50 CST, end at Thu 2023-12-07 13:41:23 CST. --
12月 07 13:16:19 localhost kernel: usb 2-1.2.1: Disable of device-initiated U1 failed.
12月 07 13:16:19 localhost kernel: usb 2-1.2.1: Disable of device-initiated U2 failed.
12月 07 13:16:19 localhost kernel: usb 2-1.2.1: reset SuperSpeed USB device number 11 using xhci_hcd
12月 07 13:16:20 localhost kernel: usb 2-1.2.1: reset SuperSpeed USB device number 11 using xhci_hcd
12月 07 13:22:48 localhost kernel: usb 2-2.2: Disable of device-initiated U1 failed.
12月 07 13:22:48 localhost kernel: usb 2-2.2: Disable of device-initiated U2 failed.
12月 07 13:22:48 localhost kernel: usb 2-2.2: reset SuperSpeed USB device number 9 using xhci_hcd
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: USB disconnect, device number 22
12月 07 13:22:49 localhost kernel: usb 2-2.2: reset SuperSpeed USB device number 9 using xhci_hcd
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: new SuperSpeed USB device number 28 using xhci_hcd
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: New USB device found, idVendor=2109, idProduct=0822, bcdDevice= 0.30
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: Product: USB3.1 Hub
12月 07 13:22:49 localhost kernel: usb 2-2.2.1: Manufacturer: VIA Labs, Inc.
12月 07 13:22:49 localhost kernel: hub 2-2.2.1:1.0: USB hub found
12月 07 13:22:49 localhost kernel: hub 2-2.2.1:1.0: 4 ports detected
12月 07 13:26:42 localhost kernel: usb 2-2.2.1: Disable of device-initiated U1 failed.
12月 07 13:26:42 localhost kernel: usb 2-2.2.1: Disable of device-initiated U2 failed.
12月 07 13:26:42 localhost kernel: usb 2-2.2.1: reset SuperSpeed USB device number 28 using xhci_hcd
12月 07 13:26:43 localhost kernel: usb 2-2.2.1: reset SuperSpeed USB device number 28 using xhci_hcd
12月 07 13:34:49 localhost kernel: usb 2-1.2: Disable of device-initiated U1 failed.
12月 07 13:34:49 localhost kernel: usb 2-1.2: Disable of device-initiated U2 failed.
12月 07 13:34:49 localhost kernel: usb 2-1.2: reset SuperSpeed USB device number 7 using xhci_hcd
12月 07 13:34:50 localhost kernel: usb 2-1.2.1: USB disconnect, device number 11
帮助文档
help
root@localhost:~# journalctl --help
journalctl [OPTIONS...] [MATCHES...]
Query the journal.
Options:
--system Show the system journal
--user Show the user journal for the current user
-M --machine=CONTAINER Operate on local container
-S --since=DATE Show entries not older than the specified date
-U --until=DATE Show entries not newer than the specified date
-c --cursor=CURSOR Show entries starting at the specified cursor
--after-cursor=CURSOR Show entries after the specified cursor
--show-cursor Print the cursor after all the entries
--cursor-file=FILE Show entries after cursor in FILE and update FILE
-b --boot[=ID] Show current boot or the specified boot
--list-boots Show terse information about recorded boots
-k --dmesg Show kernel message log from the current boot
-u --unit=UNIT Show logs from the specified unit
--user-unit=UNIT Show logs from the specified user unit
-t --identifier=STRING Show entries with the specified syslog identifier
-p --priority=RANGE Show entries with the specified priority
--facility=FACILITY... Show entries with the specified facilities
-g --grep=PATTERN Show entries with MESSAGE matching PATTERN
--case-sensitive[=BOOL] Force case sensitive or insenstive matching
-e --pager-end Immediately jump to the end in the pager
-f --follow Follow the journal
-n --lines[=INTEGER] Number of journal entries to show
--no-tail Show all lines, even in follow mode
-r --reverse Show the newest entries first
-o --output=STRING Change journal output mode (short, short-precise,
short-iso, short-iso-precise, short-full,
short-monotonic, short-unix, verbose, export,
json, json-pretty, json-sse, json-seq, cat,
with-unit)
--output-fields=LIST Select fields to print in verbose/export/json modes
--utc Express time in Coordinated Universal Time (UTC)
-x --catalog Add message explanations where available
--no-full Ellipsize fields
-a --all Show all fields, including long and unprintable
-q --quiet Do not show info messages and privilege warning
--no-pager Do not pipe output into a pager
--no-hostname Suppress output of hostname field
-m --merge Show entries from all available journals
-D --directory=PATH Show journal files from directory
--file=PATH Show journal file
--root=ROOT Operate on files below a root directory
--namespace=NAMESPACE Show journal data from specified namespace
--interval=TIME Time interval for changing the FSS sealing key
--verify-key=KEY Specify FSS verification key
--force Override of the FSS key pair with --setup-keys
Commands:
-h --help Show this help text
--version Show package version
-N --fields List all field names currently used
-F --field=FIELD List all values that a specified field takes
--disk-usage Show total disk usage of all journal files
--vacuum-size=BYTES Reduce disk usage below specified size
--vacuum-files=INT Leave only the specified number of journal files
--vacuum-time=TIME Remove journal files older than specified time
--verify Verify journal file consistency
--sync Synchronize unwritten journal messages to disk
--relinquish-var Stop logging to disk, log to temporary file system
--smart-relinquish-var Similar, but NOP if log directory is on root mount
--flush Flush all journal data from /run into /var
--rotate Request immediate rotation of the journal files
--header Show journal header information
--list-catalog Show all message IDs in the catalog
--dump-catalog Show entries in the message catalog
--update-catalog Update the message catalog database
--setup-keys Generate a new FSS key pair
See the journalctl(1) man page for details.
man手册
root@localhost:~# man 1 journalctl
JOURNALCTL(1) journalctl JOURNALCTL(1)
NAME
journalctl - Query the systemd journal
SYNOPSIS
journalctl [OPTIONS...] [MATCHES...]
DESCRIPTION
journalctl may be used to query the contents of the systemd(1) journal as written by systemd-journald.service(8).
If called without parameters, it will show the full contents of the journal, starting with the oldest entry collected.
If one or more match arguments are passed, the output is filtered accordingly. A match is in the format "FIELD=VALUE", e.g. "_SYSTEMD_UNIT=httpd.service",
referring to the components of a structured journal entry. See systemd.journal-fields(7) for a list of well-known fields. If multiple matches are specified
matching different fields, the log entries are filtered by both, i.e. the resulting output will show only entries matching all the specified matches of this
kind. If two matches apply to the same field, then they are automatically matched as alternatives, i.e. the resulting output will show entries matching any
of the specified matches for the same field. Finally, the character "+" may appear as a separate word between other terms on the command line. This causes
all matches before and after to be combined in a disjunction (i.e. logical OR).
It is also possible to filter the entries by specifying an absolute file path as an argument. The file path may be a file or a symbolic link and the file
must exist at the time of the query. If a file path refers to an executable binary, an "_EXE=" match for the canonicalized binary path is added to the query.
If a file path refers to an executable script, a "_COMM=" match for the script name is added to the query. If a file path refers to a device node,
"_KERNEL_DEVICE=" matches for the kernel name of the device and for each of its ancestor devices is added to the query. Symbolic links are dereferenced,
kernel names are synthesized, and parent devices are identified from the environment at the time of the query. In general, a device node is the best proxy
for an actual device, as log entries do not usually contain fields that identify an actual device. For the resulting log entries to be correct for the actual
device, the relevant parts of the environment at the time the entry was logged, in particular the actual device corresponding to the device node, must have
been the same as those at the time of the query. Because device nodes generally change their corresponding devices across reboots, specifying a device node
path causes the resulting entries to be restricted to those from the current boot.
Additional constraints may be added using options --boot, --unit=, etc., to further limit what entries will be shown (logical AND).
Output is interleaved from all accessible journal files, whether they are rotated or currently being written, and regardless of whether they belong to the
system itself or are accessible user journals.
The set of journal files which will be used can be modified using the --user, --system, --directory, and --file options, see below.
All users are granted access to their private per-user journals. However, by default, only root and users who are members of a few special groups are granted
access to the system journal and the journals of other users. Members of the groups "systemd-journal", "adm", and "wheel" can read all journal files. Note
that the two latter groups traditionally have additional privileges specified by the distribution. Members of the "wheel" group can often perform
Manual page journalctl(1) line 1 (press h for help or q to quit)