一、journalctl命令简述

journalctl [OPTIONS...] [MATCHES...]

Query the journal.

Flags:--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-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-t --identifier=STRING   Show entries with the specified syslog identifier-p --priority=RANGE      Show entries with the specified priority-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-iso,short-precise, short-monotonic, verbose,export, json, json-pretty, json-sse, cat)--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 privilege warning--no-pager            Do not pipe output into a pager-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 catalog files underneath the root ROOT--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-keysCommands:-h --help                Show this help text--version             Show package version-F --field=FIELD         List all values that a specified field takes--new-id128           Generate a new 128-bit ID--disk-usage          Show total disk usage of all journal files--vacuum-size=BYTES   Reduce disk usage below specified size--vacuum-time=TIME    Remove journal files older than specified date--flush               Flush all journal data from /run into /var--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--verify              Verify journal file consistency

二、journalctl常用选项

journalctl -e // Immediately jump to the end in the pager(立即跳到日志页面结尾处)

journalctl -e

1月 04 18:30:32 server1 systemd[1]: Started Session 22 of user root.
1月 04 18:30:32 server1 systemd[1]: Starting Session 22 of user root.
1月 04 18:30:32 server1 CROND[55734]: (root) CMD (/usr/lib64/sa/sa1 1 1)
1月 04 18:40:01 server1 systemd[1]: Started Session 23 of user root.
1月 04 18:40:01 server1 systemd[1]: Starting Session 23 of user root.
1月 04 18:40:01 server1 CROND[55818]: (root) CMD (/usr/lib64/sa/sa1 1 1)
1月 04 18:50:01 server1 systemd[1]: Started Session 24 of user root.
1月 04 18:50:01 server1 systemd[1]: Starting Session 24 of user root.
1月 04 18:50:01 server1 CROND[55907]: (root) CMD (/usr/lib64/sa/sa1 1 1)
1月 04 19:00:01 server1 systemd[1]: Started Session 25 of user root.
1月 04 19:00:01 server1 systemd[1]: Starting Session 25 of user root.
1月 04 19:00:01 server1 CROND[55997]: (root) CMD (/usr/lib64/sa/sa1 1 1)
1月 04 19:01:01 server1 systemd[1]: Started Session 26 of user root.
1月 04 19:01:01 server1 systemd[1]: Starting Session 26 of user root.
1月 04 19:01:01 server1 CROND[56011]: (root) CMD (run-parts /etc/cron.hourly)
1月 04 19:01:01 server1 run-parts(/etc/cron.hourly)[56014]: starting 0anacron
1月 04 19:01:01 server1 run-parts(/etc/cron.hourly)[56020]: finished 0anacron
1月 04 19:10:01 server1 systemd[1]: Started Session 27 of user root.
1月 04 19:10:01 server1 systemd[1]: Starting Session 27 of user root.
1月 04 19:10:01 server1 CROND[56105]: (root) CMD (/usr/lib64/sa/sa1 1 1)

journalctl -u //查看指定单元 ( unit ) 的日志

journalctl -u httpd

[root@server1 ~]# journalctl -u httpd
-- Logs begin at 日 2020-11-22 04:33:29 CST, end at 一 2021-01-04 19:30:01 CST. --
1月 04 19:24:46 server1 systemd[1]: Starting The Apache HTTP Server...
1月 04 19:25:06 server1 httpd[56288]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using fe80::4f00:5a8e:3923:429d. Set the 'ServerName' directive
1月 04 19:25:26 server1 systemd[1]: Started The Apache HTTP Server.
1月 04 19:27:57 server1 systemd[1]: Stopping The Apache HTTP Server...
1月 04 19:27:58 server1 systemd[1]: Stopped The Apache HTTP Server.

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journalctl用法详解

文章目录

一、journalctl命令简述

二、journalctl常用选项

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