我需要更改 Ubuntu Core 16 上 journald 的默认配置,以便我可以看到以前启动时的 docker 守护进程日志。
但是,/etc/systemd/journald.conf 位于只读文件系统上,并且我发现的有关对此类文件进行更改的所有信息都失败了。
标准建议是sudo mount -o remount,rw /
,但这给了我错误消息mount: cannot remount /dev/root read-write, is write-protected
这ubuntu 核心文档表示应该使用 udisks2 snap 进行磁盘管理,但是通过阅读该软件的文档,我无法确定此功能是否可用。
修改 /etc 文件的大多数其他用例似乎可以通过操作替代品来解决。
答案1
对于多个启动日志(Ubuntu 16.04 重启后如何查找以前的启动日志?)您不需要对 的读/写访问权限/etc
。您需要对 的读/写访问权限,/var/log
而您应该已经拥有该权限。
总结一下链接:
$ sudo mkdir -p /var/log/journal
$ sudo systemd-tmpfiles --create --prefix /var/log/journal
显示之前的靴子列表
积累启动历史记录后,使用:
$ journalctl --list-boots
-15 58a9e56135564cd8a52d547b19e76bf5 Fri 2018-02-02 18:34:35 MST—Fri 2018-02-02 23:07:14 M
-14 3514e056440341b1b6e5f03d109681bc Sat 2018-02-03 06:05:12 MST—Sat 2018-02-03 08:07:44 M
-13 0d1a32dc275348589f5ecdc72180c018 Sat 2018-02-03 08:08:05 MST—Sat 2018-02-03 08:08:34 M
-12 74159b593f3a401589ee6bd78e31684b Sat 2018-02-03 08:08:51 MST—Sun 2018-02-04 08:32:09 M
-11 4b394a9aad584ab2bfabe3b77eeed78f Sun 2018-02-04 08:32:26 MST—Mon 2018-02-05 16:54:02 M
-10 8e461ed2593c4fd896ca3b71eb3c0fba Mon 2018-02-05 16:54:34 MST—Tue 2018-02-06 03:54:30 M
-9 ec7ba0e4dfe241c0b9c978d278fcca6d Tue 2018-02-06 03:54:47 MST—Tue 2018-02-06 16:25:02 M
-8 b5c110267c214c38b63d0a367197d118 Tue 2018-02-06 16:25:19 MST—Thu 2018-02-08 16:49:03 M
-7 75c3b117ac6a4de984dc3ced15edb7f8 Thu 2018-02-08 16:49:22 MST—Fri 2018-02-09 03:51:09 M
-6 7338bd1007bc42dda5c8667eeefe1a59 Fri 2018-02-09 03:51:26 MST—Fri 2018-02-09 16:55:52 M
-5 4b6cd0121327454ca3db035c7ed42df6 Fri 2018-02-09 16:56:09 MST—Sat 2018-02-10 07:55:14 M
-4 0d56207f9ec0405ca3a3fd638334de2f Sat 2018-02-10 07:55:32 MST—Mon 2018-02-12 22:16:05 M
-3 0f230cc546fd4aec8f5233e0074ab3e1 Tue 2018-02-13 03:57:20 MST—Wed 2018-02-14 22:58:56 M
-2 c0d2c0141dd840cbab75d3c2254f8781 Wed 2018-02-14 22:59:13 MST—Sat 2018-02-17 22:46:14 M
-1 aafb2573a6374e019a7165cb8eee74a0 Sun 2018-02-18 06:02:03 MST—Mon 2018-02-19 04:16:36 M
0 8462f1969c6f4d61973e7e245014b846 Mon 2018-02-19 04:16:53 MST—Tue 2018-02-20 18:51:42 M
显示上次启动日志
$ journalctl -b-1
-- Logs begin at Fri 2018-02-02 18:34:35 MST, end at Thu 2018-03-01 16:43:25 MST. --
Feb 28 20:03:15 alien systemd-journald[290]: Runtime journal (/run/log/journal/) is 8.0M,
Feb 28 20:03:15 alien kernel: Linux version 4.14.23-041423-generic (kernel@kathleen) (gcc
Feb 28 20:03:15 alien kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-4.14.23-041423-generi
Feb 28 20:03:15 alien kernel: KERNEL supported cpus:
Feb 28 20:03:15 alien kernel: Intel GenuineIntel
Feb 28 20:03:15 alien kernel: AMD AuthenticAMD
Feb 28 20:03:15 alien kernel: Centaur CentaurHauls
Feb 28 20:03:15 alien kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point
Feb 28 20:03:15 alien kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Feb 28 20:03:15 alien kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Feb 28 20:03:15 alien kernel: x86/fpu: Supporting XSAVE feature 0x008: 'MPX bounds registe
Feb 28 20:03:15 alien kernel: x86/fpu: Supporting XSAVE feature 0x010: 'MPX CSR'
Feb 28 20:03:15 alien kernel: x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
Feb 28 20:03:15 alien kernel: x86/fpu: xstate_offset[3]: 832, xstate_sizes[3]: 64
Feb 28 20:03:15 alien kernel: x86/fpu: xstate_offset[4]: 896, xstate_sizes[4]: 64
Feb 28 20:03:15 alien kernel: x86/fpu: Enabled xstate features 0x1f, context size is 960 b
Feb 28 20:03:15 alien kernel: e820: BIOS-provided physical RAM map:
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000000000000-0x0000000000057fff] usabl
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000000058000-0x0000000000058fff] reser
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000000059000-0x000000000009dfff] usabl
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x000000000009e000-0x000000000009ffff] reser
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000000100000-0x0000000030a5ffff] usabl
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030a60000-0x0000000030a71fff] reser
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030a72000-0x0000000030a89fff] usabl
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030a8a000-0x0000000030a8afff] ACPI
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030a8b000-0x0000000030ad4fff] reser
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030ad5000-0x0000000030b2dfff] usabl
Feb 28 20:03:15 alien kernel: BIOS-e820: [mem 0x0000000030b2e000-0x0000000031099fff] reser
lines 1-29
密切关注该参数,-b-1
它与您可能看到的其他参考不同。
使用以下方法减小日志文件大小vacuum
我cron
设置了每月一次的任务,将日志文件的大小控制在 200MB 以内:Systemd 日志(`journalctl`)太大且速度慢。这不仅减少了存储要求,而且加快了所有启动日志的搜索速度。
例如,要将 312 MB 的消耗减少到 200 MB(或更少),请使用:
$ journalctl --vacuum-size=200M
Deleted archived journal /var/log/journal/d7b25a27fe064cadb75a2f2f6ca7764e/[email protected]~ (56.0M).
Deleted archived journal /var/log/journal/d7b25a27fe064cadb75a2f2f6ca7764e/[email protected]~ (8.0M).
Deleted archived journal /var/log/journal/d7b25a27fe064cadb75a2f2f6ca7764e/user-1000@1bbb77599cf14c65a18af51646751696-000000000000064f-00056444d58433e1.journal (112.0M).
Vacuuming done, freed 176.0M of archived journals on disk.