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「最後の」コマンド出力で複数の同時終了時間が発生する原因は何ですか？

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「最後の」コマンド出力で複数の同時終了時間が発生する原因は何ですか？

サーバーのいくつかの中断の問題を解決していますが、サーバーが断続的に再起動しているようです。最後のコマンドを実行すると、次の出力が表示されます（わかりやすくするために行番号を追加しました）。

01. root@nina-xms-dev:/home/nina# last
02. nina     pts/0        192.168.2.1      Wed Jan 30 12:09   still logged in
03. reboot   system boot  4.15.0-44-generi Wed Jan 30 12:09   still running
04. nina     pts/0        192.168.2.1      Wed Jan 30 11:59 - crash  (00:09)
05. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:55   still running
06. nina     pts/0        192.168.2.1      Wed Jan 30 11:48 - 11:54  (00:06)
07. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:47 - 11:54  (00:07)
08. nina     pts/0        192.168.2.1      Wed Jan 30 11:45 - crash  (00:01)
09. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)
10. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:23 - 11:54  (00:31)
11. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:08 - 11:54  (00:45)
12. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:58 - 11:54  (00:55)
13. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:50 - 11:54  (01:04)
14. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:31 - 11:54  (01:23)
15. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:18 - 11:54  (01:36)
16. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:04 - 11:54  (01:50)
17. reboot   system boot  4.15.0-44-generi Wed Jan 30 09:49 - 11:54  (02:05)
18. reboot   system boot  4.15.0-44-generi Wed Jan 30 09:35 - 11:54  (02:19)
19. reboot   system boot  4.15.0-44-generi Wed Jan 30 09:25 - 11:54  (02:29)
20. reboot   system boot  4.15.0-44-generi Wed Jan 30 09:18 - 11:54  (02:36)
21. reboot   system boot  4.15.0-44-generi Wed Jan 30 09:06 - 11:54  (02:48)
22. reboot   system boot  4.15.0-44-generi Wed Jan 30 08:53 - 11:54  (03:01)
23. reboot   system boot  4.15.0-44-generi Wed Jan 30 08:44 - 11:54  (03:10)
24. reboot   system boot  4.15.0-44-generi Wed Jan 30 08:32 - 11:54  (03:22)
25. reboot   system boot  4.15.0-44-generi Wed Jan 30 08:19 - 11:54  (03:35)
26. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:59 - 11:54  (03:55)
27. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:54 - 11:54  (04:00)
28. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:45 - 11:54  (04:09)
29. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:33 - 11:54  (04:21)
30. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:25 - 11:54  (04:29)
31. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:08 - 11:54  (04:46)
32. reboot   system boot  4.15.0-44-generi Wed Jan 30 07:00 - 11:54  (04:54)
33. reboot   system boot  4.15.0-44-generi Wed Jan 30 06:41 - 11:54  (05:13)
34. reboot   system boot  4.15.0-44-generi Wed Jan 30 06:20 - 11:54  (05:34)
35. reboot   system boot  4.15.0-44-generi Wed Jan 30 06:02 - 11:54  (05:51)
36. reboot   system boot  4.15.0-44-generi Wed Jan 30 05:52 - 11:54  (06:02)
37. reboot   system boot  4.15.0-44-generi Wed Jan 30 05:43 - 11:54  (06:11)
38. reboot   system boot  4.15.0-44-generi Wed Jan 30 05:28 - 11:54  (06:26)
39. reboot   system boot  4.15.0-44-generi Wed Jan 30 05:16 - 11:54  (06:38)
40. reboot   system boot  4.15.0-44-generi Wed Jan 30 05:00 - 11:54  (06:54)
41. reboot   system boot  4.15.0-44-generi Wed Jan 30 04:48 - 11:54  (07:05)
42. reboot   system boot  4.15.0-44-generi Wed Jan 30 04:32 - 11:54  (07:22)
43. reboot   system boot  4.15.0-44-generi Wed Jan 30 04:17 - 11:54  (07:37)
44. reboot   system boot  4.15.0-44-generi Wed Jan 30 04:09 - 11:54  (07:45)
45. reboot   system boot  4.15.0-44-generi Wed Jan 30 03:40 - 11:54  (08:14)
46. reboot   system boot  4.15.0-44-generi Wed Jan 30 03:29 - 11:54  (08:25)
47. reboot   system boot  4.15.0-44-generi Wed Jan 30 03:17 - 11:54  (08:36)
48. reboot   system boot  4.15.0-44-generi Wed Jan 30 03:14 - 11:54  (08:40)
49. reboot   system boot  4.15.0-44-generi Wed Jan 30 03:02 - 11:54  (08:52)
50. reboot   system boot  4.15.0-44-generi Wed Jan 30 02:51 - 11:54  (09:03)
51. reboot   system boot  4.15.0-44-generi Wed Jan 30 02:33 - 11:54  (09:21)
52. reboot   system boot  4.15.0-44-generi Wed Jan 30 02:23 - 11:54  (09:31)
53. reboot   system boot  4.15.0-44-generi Wed Jan 30 02:15 - 11:54  (09:39)
54. reboot   system boot  4.15.0-44-generi Wed Jan 30 02:02 - 11:54  (09:52)
55. reboot   system boot  4.15.0-44-generi Wed Jan 30 01:54 - 11:54  (10:00)
56. reboot   system boot  4.15.0-44-generi Wed Jan 30 01:40 - 11:54  (10:14)
57. reboot   system boot  4.15.0-44-generi Wed Jan 30 01:30 - 11:54  (10:24)
58. reboot   system boot  4.15.0-44-generi Wed Jan 30 01:21 - 11:54  (10:33)
59. reboot   system boot  4.15.0-44-generi Wed Jan 30 01:05 - 11:54  (10:49)
60. reboot   system boot  4.15.0-44-generi Wed Jan 30 00:59 - 11:54  (10:55)
61. reboot   system boot  4.15.0-44-generi Wed Jan 30 00:46 - 11:54  (11:07)
62. reboot   system boot  4.15.0-44-generi Wed Jan 30 00:32 - 11:54  (11:22)
63. reboot   system boot  4.15.0-44-generi Wed Jan 30 00:17 - 11:54  (11:37)
64. reboot   system boot  4.15.0-44-generi Wed Jan 30 00:03 - 11:54  (11:51)
65. reboot   system boot  4.15.0-44-generi Tue Jan 29 23:46 - 11:54  (12:08)
66. reboot   system boot  4.15.0-44-generi Tue Jan 29 23:39 - 11:54  (12:15)
67. reboot   system boot  4.15.0-44-generi Tue Jan 29 23:34 - 11:54  (12:20)
68. reboot   system boot  4.15.0-44-generi Tue Jan 29 23:18 - 11:54  (12:36)
69. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:48 - 11:54  (13:05)
70. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:44 - 11:54  (13:10)
71. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:39 - 11:54  (13:15)
72. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:25 - 11:54  (13:29)
73. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:19 - 11:54  (13:35)
74. reboot   system boot  4.15.0-44-generi Tue Jan 29 22:08 - 11:54  (13:46)
75. reboot   system boot  4.15.0-44-generi Tue Jan 29 21:45 - 11:54  (14:09)
76. reboot   system boot  4.15.0-44-generi Tue Jan 29 21:24 - 11:54  (14:30)
77. reboot   system boot  4.15.0-44-generi Tue Jan 29 21:09 - 11:54  (14:45)
78. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:58 - 11:54  (14:56)
79. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:43 - 11:54  (15:11)
80. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:40 - 11:54  (15:14)
81. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:30 - 11:54  (15:24)
82. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:20 - 11:54  (15:34)
83. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:13 - 11:54  (15:41)
84. reboot   system boot  4.15.0-44-generi Tue Jan 29 20:07 - 11:54  (15:46)
85. reboot   system boot  4.15.0-44-generi Tue Jan 29 19:49 - 11:54  (16:05)
86. reboot   system boot  4.15.0-44-generi Tue Jan 29 19:24 - 11:54  (16:30)
87. reboot   system boot  4.15.0-44-generi Tue Jan 29 19:09 - 11:54  (16:45)
88. reboot   system boot  4.15.0-44-generi Tue Jan 29 18:51 - 11:54  (17:03)
89. reboot   system boot  4.15.0-44-generi Tue Jan 29 18:36 - 11:54  (17:18)
90. reboot   system boot  4.15.0-44-generi Tue Jan 29 18:18 - 11:54  (17:36)
91. reboot   system boot  4.15.0-44-generi Tue Jan 29 18:08 - 11:54  (17:46)
92. reboot   system boot  4.15.0-44-generi Tue Jan 29 17:57 - 11:54  (17:57)
93. reboot   system boot  4.15.0-44-generi Tue Jan 29 17:31 - 11:54  (18:23)
94. reboot   system boot  4.15.0-44-generi Tue Jan 29 17:18 - 11:54  (18:36)
95. reboot   system boot  4.15.0-44-generi Tue Jan 29 17:02 - 11:54  (18:52)
96. nina     pts/0        192.168.1.222    Tue Jan 29 17:00 - crash  (00:01)
97. reboot   system boot  4.15.0-44-generi Tue Jan 29 16:59 - 11:54  (18:55)
98. nina     pts/0        192.168.1.222    Tue Jan 29 16:54 - crash  (00:04)
99. reboot   system boot  4.15.0-44-generi Tue Jan 29 16:51 - 11:54  (19:03)
100. nina     pts/0        192.168.1.222    Tue Jan 29 16:49 - 16:50  (00:00)
101. reboot   system boot  4.15.0-44-generi Tue Jan 29 16:39 - 16:50  (00:10)
102. nina     pts/0        192.168.1.222    Tue Jan 29 16:07 - crash  (00:31)
103. reboot   system boot  4.15.0-44-generi Tue Jan 29 16:07 - 16:50  (00:43)
104. nina     pts/0        192.168.1.222    Tue Jan 29 15:59 - crash  (00:07)
105. reboot   system boot  4.15.0-44-generi Tue Jan 29 15:51 - 16:50  (00:59)
106. reboot   system boot  4.15.0-44-generi Tue Jan 29 15:46 - 16:50  (01:04)
107. nina     pts/0        192.168.1.222    Tue Jan 29 15:38 - 15:45  (00:07)
108. reboot   system boot  4.15.0-44-generi Tue Jan 29 15:35 - 15:45  (00:09)
109. nina     pts/0        192.168.1.222    Tue Jan 29 15:26 - crash  (00:08)
110. reboot   system boot  4.15.0-44-generi Tue Jan 29 15:12 - 15:45  (00:32)
111. reboot   system boot  4.15.0-44-generi Tue Jan 29 15:02 - 15:45  (00:43)
112. reboot   system boot  4.15.0-44-generi Tue Jan 29 14:40 - 15:45  (01:05)
113. reboot   system boot  4.15.0-44-generi Tue Jan 29 14:18 - 15:45  (01:27)
114. reboot   system boot  4.15.0-44-generi Tue Jan 29 14:08 - 15:45  (01:36)
115. reboot   system boot  4.15.0-44-generi Tue Jan 29 13:41 - 15:45  (02:04)
116. reboot   system boot  4.15.0-44-generi Tue Jan 29 13:36 - 15:45  (02:08)
117. reboot   system boot  4.15.0-44-generi Tue Jan 29 13:27 - 15:45  (02:17)
118. reboot   system boot  4.15.0-44-generi Tue Jan 29 13:14 - 15:45  (02:30)
119. reboot   system boot  4.15.0-44-generi Tue Jan 29 13:01 - 15:45  (02:44)
120. reboot   system boot  4.15.0-44-generi Tue Jan 29 12:41 - 15:45  (03:03)
121. reboot   system boot  4.15.0-44-generi Tue Jan 29 12:34 - 15:45  (03:10)
122. reboot   system boot  4.15.0-44-generi Tue Jan 29 12:27 - 15:45  (03:17)
123. reboot   system boot  4.15.0-44-generi Tue Jan 29 12:13 - 15:45  (03:31)
124. reboot   system boot  4.15.0-44-generi Tue Jan 29 11:57 - 15:45  (03:48)
125. reboot   system boot  4.15.0-44-generi Tue Jan 29 11:48 - 15:45  (03:57)
126. reboot   system boot  4.15.0-44-generi Tue Jan 29 11:16 - 15:45  (04:28)
127. reboot   system boot  4.15.0-44-generi Tue Jan 29 10:16 - 15:45  (05:28)
128. reboot   system boot  4.15.0-44-generi Tue Jan 29 09:08 - 15:45  (06:36)
129. reboot   system boot  4.15.0-44-generi Tue Jan 29 07:38 - 15:45  (08:06)
130. reboot   system boot  4.15.0-44-generi Tue Jan 29 06:45 - 15:45  (08:59)
131. reboot   system boot  4.15.0-44-generi Tue Jan 29 05:10 - 15:45  (10:34)
132. reboot   system boot  4.15.0-44-generi Tue Jan 29 04:36 - 15:45  (11:09)
133. reboot   system boot  4.15.0-44-generi Tue Jan 29 03:48 - 15:45  (11:56)
134. reboot   system boot  4.15.0-44-generi Tue Jan 29 03:08 - 15:45  (12:37)
135. reboot   system boot  4.15.0-44-generi Tue Jan 29 02:19 - 15:45  (13:26)
136. reboot   system boot  4.15.0-44-generi Tue Jan 29 00:18 - 15:45  (15:27)
137. reboot   system boot  4.15.0-44-generi Mon Jan 28 23:45 - 15:45  (15:59)
138. reboot   system boot  4.15.0-43-generi Mon Jan 28 20:49 - 15:45  (18:56)
139. reboot   system boot  4.15.0-43-generi Mon Jan 28 19:54 - 15:45  (19:51)
140. reboot   system boot  4.15.0-43-generi Mon Jan 28 19:21 - 15:45  (20:23)
141. reboot   system boot  4.15.0-43-generi Mon Jan 28 17:14 - 15:45  (22:31)
142. reboot   system boot  4.15.0-43-generi Mon Jan 28 14:03 - 15:45 (1+01:42)
143. reboot   system boot  4.15.0-43-generi Mon Jan 28 13:33 - 15:45 (1+02:11)
144. nina     pts/0        192.168.1.222    Mon Jan 28 10:54 - 11:04  (00:10)
145. reboot   system boot  4.15.0-43-generi Mon Jan 28 10:53 - 15:45 (1+04:51)
146. nina     pts/0        192.168.1.222    Mon Jan 28 10:42 - 10:53  (00:10)
147. reboot   system boot  4.15.0-43-generi Mon Jan 28 10:39 - 10:53  (00:13)
148. nina     pts/0        192.168.1.222    Mon Jan 28 10:35 - crash  (00:03)
149. reboot   system boot  4.15.0-43-generi Mon Jan 28 05:40 - 10:53  (05:12)
150. reboot   system boot  4.15.0-43-generi Mon Jan 28 03:25 - 10:53  (07:27)
151. ... etc....

次の行が与えられた場合：

09. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)

上記の行は、システムが11:34に起動し、20分間実行され、次に11:54に終了することを意味します。

私が理解していないのは、同じ締め切りで繰り返される複数の行があるということです。

09. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)
10. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:23 - 11:54  (00:31)
11. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:08 - 11:54  (00:45)
12. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:58 - 11:54  (00:55)
13. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:50 - 11:54  (01:04)

10行目はコンピューターが11時23分に始まったと言い、11行目はコンピューターが11時8分に始まったと言い、12行目は10:58、13行目は10:50と言います。しかし、すべて終了時間が11時54分だそうです。

代わりに、進行中の開始が開始される前に各終了時間が終了したいと思います。次の内容があります。

09. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)
10. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:23 - 11:33  (00:10)
11. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:08 - 11:22  (00:14)
12. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:58 - 11:07  (00:09)
13. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:50 - 11:57  (00:07)

各期間（ただし11時54分ではない）の間に文書化されていない終了があると仮定する必要がありますか？それとも、各期間の間に実際に別々の起動がなく、それ以降サーバーが常にオンになっていると仮定する必要がありますか？

開始および終了イベントログを関連付ける他のログファイルはありますか？

答え1

何が起こっているのかを示すのに役立つ追加情報が見つかりました。 "last"コマンドは、デフォルトでシャットダウンまたはランレベルの変更を出力しないことがわかりました。 （実行レベル0はシャットダウンを意味し、他の場合はシステムが実行中であることを意味します。レベル5は正常な実行レベルであるようです）。

「-x」フラグを追加すると、次の出力が表示されます。

01. nina   @nina   -xms-dev:~$ last -x
02. nina     pts/0        192.168.2.1      Wed Jan 30 13:12   still logged in
03. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 13:09   still running
04. reboot   system boot  4.15.0-44-generi Wed Jan 30 13:09   still running
05. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 12:59 - 13:09  (00:10)
06. reboot   system boot  4.15.0-44-generi Wed Jan 30 12:59   still running
07. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 12:50 - 12:59  (00:08)
08. reboot   system boot  4.15.0-44-generi Wed Jan 30 12:50   still running
09. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 12:33 - 12:50  (00:17)
10. reboot   system boot  4.15.0-44-generi Wed Jan 30 12:32   still running
11. nina     pts/0        192.168.2.1      Wed Jan 30 12:09 - crash  (00:23)
12. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 12:09 - 12:33  (00:23)
13. reboot   system boot  4.15.0-44-generi Wed Jan 30 12:09   still running
14. nina     pts/0        192.168.2.1      Wed Jan 30 11:59 - crash  (00:09)
15. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:55 - 12:09  (00:13)
16. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:55   still running
17. shutdown system down  4.15.0-44-generi Wed Jan 30 11:54 - 11:55  (00:00)
18. nina     pts/0        192.168.2.1      Wed Jan 30 11:48 - 11:54  (00:06)
19. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:47 - 11:54  (00:06)
20. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:47 - 11:54  (00:07)
21. nina     pts/0        192.168.2.1      Wed Jan 30 11:45 - crash  (00:01)
22. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:34 - 11:47  (00:13)
23. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)
24. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:23 - 11:34  (00:10)
25. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:23 - 11:54  (00:31)
26. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:09 - 11:23  (00:14)
27. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:08 - 11:54  (00:45)
28. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:59 - 11:09  (00:10)
29. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:58 - 11:54  (00:55)
30. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:50 - 10:59  (00:08)
31. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:50 - 11:54  (01:04)
32. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:32 - 10:50  (00:18)
33. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:31 - 11:54  (01:23)
34. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:18 - 10:32  (00:13)

再起動コマンドは同じで奇妙なデータを持っていますが、ランレベルインジケータは私が期待する出力に近いです。

  19. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:47 - 11:54  (00:06)
  20. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:47 - 11:54  (00:07)
  21. nina     pts/0        192.168.2.1      Wed Jan 30 11:45 - crash  (00:01)
> 22. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:34 - 11:47  (00:13)
  23. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:34 - 11:54  (00:20)
> 24. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:23 - 11:34  (00:10)
  25. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:23 - 11:54  (00:31)
> 26. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 11:09 - 11:23  (00:14)
  27. reboot   system boot  4.15.0-44-generi Wed Jan 30 11:08 - 11:54  (00:45)
> 28. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:59 - 11:09  (00:10)
  29. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:58 - 11:54  (00:55)
> 30. runlevel (to lvl 5)   4.15.0-44-generi Wed Jan 30 10:50 - 10:59  (00:08)
  31. reboot   system boot  4.15.0-44-generi Wed Jan 30 10:50 - 11:54  (01:04)

不明な理由でサーバーがシャットダウンした場合、再起動情報のみを使用するよりもランレベルが信頼できるようです。

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