我无法使用SSH连接到我的计算服务器虚拟机。 它说“重试2/3 .. 3/3”
看起来好像服务器实际上正在运行和运行。 我有安装了一些应用程序的Apache Tomcat和MySql服务器。 我可以连接到Apache Tomcat的pipe理页面，我没有看到任何问题。 我可以使用客户端工具（如MySQL WorkBench）连接到我的MySQL数据库。 我可以插入新的行到表中，并删除一些。 它看起来不像可用磁盘空间。 无论如何，我试图从表中删除一些数据，并缩小它，但显然自由空间不是问题。
这是我得到的一个串口日志。 请问这是什么原因？ 我使用能够在相同的条件（相同的客户端机器，防火墙等）连接，所以问题是从服务器端。
[34987645.468284] Free swap = 0kB [34987645.471547] Total swap = 0kB [34987645.474838] 157083 pages RAM [34987645.478109] 0 pages HighMem/MovableOnly [34987645.482323] 4886 pages reserved [34987645.485853] 0 pages hwpoisoned [34987645.489270] [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name [34987645.497494] [ 311] 0 311 6350 1726 14 0 0 dhclient [34987645.506101] [ 358] 0 358 6869 60 18 0 0 cron [34987645.514339] [ 369] 0 369 64668 459 29 0 0 rsyslogd [34987645.522954] [ 373] 0 373 1064 38 8 0 0 acpid [34987645.531266] [ 406] 0 406 3604 38 12 0 0 agetty [34987645.539669] [ 407] 0 407 3604 38 12 0 0 agetty [34987645.548081] [ 408] 0 408 3604 40 12 0 0 agetty [34987645.556571] [ 409] 0 409 3604 40 12 0 0 agetty [34987645.564986] [ 410] 0 410 3604 39 12 0 0 agetty [34987645.573414] [ 411] 0 411 3604 39 12 0 0 agetty [34987645.583546] [ 412] 0 412 3559 40 10 0 0 agetty [34987645.591939] [ 7263] 0 7263 13796 168 29 0 -1000 sshd [34987645.600464] [11774] 107 11774 10565 124 25 0 -900 dbus-daemon [34987645.610085] [20473] 104 20473 7292 146 19 0 0 ntpd [34987645.618585] [27741] 0 27741 13169 2273 30 0 0 google_accounts [34987645.627869] [27744] 0 27744 13211 2284 29 0 0 google_clock_sk [34987645.637039] [27747] 0 27747 13211 2244 30 0 0 google_ip_forwa [34987645.646401] [14807] 0 14807 10176 101 22 0 -1000 systemd-udevd [34987645.655412] [30481] 0 30481 1085 43 6 0 0 mysqld_safe [34987645.664327] [30815] 109 30815 221020 12045 81 0 0 mysqld [34987645.672765] [15984] 0 15984 7218 64 19 0 0 systemd-journal [34987645.681934] [19949] 108 19949 547956 45017 173 0 0 java [34987645.690161] [23671] 0 23671 10560 86 26 0 0 cron [34987645.698380] [23672] 0 23672 1085 22 7 0 0 sh [34987645.706415] [23673] 0 23673 1057 20 8 0 0 run-parts [34987645.715058] [23674] 0 23674 1085 37 6 0 0 apt [34987645.723279] [23793] 0 23793 28771 5257 62 0 0 unattended-upgr [34987645.732642] [23803] 0 23803 28579 5281 57 0 0 unattended-upgr [34987645.741809] [24237] 0 24237 4583 418 14 0 0 dpkg [34987645.750026] [24239] 0 24239 1085 23 7 0 0 google-cloud-sd [34987645.759214] [24241] 0 24241 62608 51157 126 0 0 python2 [34987645.767782] [24263] 0 24263 12231 155 28 0 0 sshd [34987645.775989] [24265] 0 24265 10553 79 26 0 0 cron [34987645.784795] [24266] 0 24266 12203 131 27 0 0 sshd [34987645.793015] [24267] 0 24267 12203 132 25 0 0 sshd [34987645.801461] [24268] 0 24268 12203 85 25 0 0 sshd [34987645.809715] [24270] 0 24270 12203 85 25 0 0 sshd [34987645.817941] [24271] 0 24271 12203 82 25 0 0 sshd [34987645.826202] [24272] 0 24272 12203 68 24 0 0 sshd [34987645.834413] [24273] 0 24273 12203 66 26 0 0 sshd [34987645.842619] [24274] 0 24274 12203 65 25 0 0 sshd [34987645.850850] [24275] 0 24275 4527 26 11 0 0 sshd [34987645.859165] Out of memory: Kill process 24241 (python2) score 326 or sacrifice child [34987645.867298] Killed process 24241 (python2) total-vm:250432kB, anon-rss:204628kB, file-rss:0kB Sep 2 08:16:18 instance-1 kernel: [34987645.059900] sshd invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=-1000 Sep 2 08:16:18 instance-1 kernel: [34987645.067997] sshd cpuset=/ mems_allowed=0 Sep 2 08:16:18 instance-1 kernel: [34987645.072637] CPU: 0 PID: 7263 Comm: sshd Not tainted 3.16.0-4-amd64 #1 Debian 3.16.7-ckt25-2+deb8u3 Sep 2 08:16:18 instance-1 kernel: [34987645.081960] Hardware name: Google Google/Google, BIOS Google 01/01/2011 Sep 2 08:16:18 instance-1 kernel: [34987645.088955] 0000000000000000 ffffffff8150e08f ffff880025daa9a0 0000000000000000 Sep 2 08:16:18 instance-1 kernel: [34987645.097277] ffffffff8150bc8b 0000000000000000 ffffffff810d51ff 0000000000000000 Sep 2 08:16:18 instance-1 kernel: [34987645.105594] ffffffff815129ae 0000000000000200 ffffffff81067933 ffffffff810c2914 Sep 2 08:16:18 instance-1 kernel: [34987645.113999] Call Trace: Sep 2 08:16:18 instance-1 kernel: [34987645.116817] [<ffffffff8150e08f>] ? dump_stack+0x5d/0x78 Sep 2 08:16:18 instance-1 kernel: [34987645.122507] [<ffffffff8150bc8b>] ? dump_header+0x76/0x1e8 Sep 2 08:16:18 instance-1 kernel: [34987645.128393] [<ffffffff810d51ff>] ? smp_call_function_single+0x5f/0xa0 Sep 2 08:16:18 instance-1 kernel: [34987645.135306] [<ffffffff815129ae>] ? mutex_lock+0xe/0x2a Sep 2 08:16:18 instance-1 kernel: [34987645.140921] [<ffffffff81067933>] ? put_online_cpus+0x23/0x80 Sep 2 08:16:18 instance-1 kernel: [34987645.147045] [<ffffffff810c2914>] ? rcu_oom_notify+0xc4/0xe0 Sep 2 08:16:18 instance-1 kernel: [34987645.153083] [<ffffffff81151bfc>] ? do_try_to_free_pages+0x4ac/0x520 Sep 2 08:16:18 instance-1 kernel: [34987645.159842] [<ffffffff8114090d>] ? oom_kill_process+0x21d/0x370 Sep 2 08:16:18 instance-1 kernel: [34987645.166311] [<ffffffff811404cd>] ? find_lock_task_mm+0x3d/0x90 Sep 2 08:16:18 instance-1 kernel: [34987645.172614] [<ffffffff81141073>] ? out_of_memory+0x473/0x4b0 Sep 2 08:16:18 instance-1 kernel: [34987645.178769] [<ffffffff81146e6d>] ? __alloc_pages_nodemask+0x9cd/0xb30 Sep 2 08:16:18 instance-1 kernel: [34987645.185690] [<ffffffff8118600d>] ? alloc_pages_current+0x9d/0x150 Sep 2 08:16:18 instance-1 kernel: [34987645.192273] [<ffffffff8113f670>] ? filemap_fault+0x1a0/0x420 Sep 2 08:16:18 instance-1 kernel: [34987645.198395] [<ffffffff8116546a>] ? __do_fault+0x3a/0xa0 Sep 2 08:16:18 instance-1 kernel: [34987645.204172] [<ffffffff8116802e>] ? do_read_fault.isra.54+0x4e/0x300 Sep 2 08:16:18 instance-1 kernel: [34987645.210908] [<ffffffff8116985c>] ? handle_mm_fault+0x63c/0x11c0 Sep 2 08:16:18 instance-1 kernel: [34987645.217288] [<ffffffff81161009>] ? vmacache_find+0x29/0xd0 Sep 2 08:16:18 instance-1 kernel: [34987645.223513] [<ffffffff810572a7>] ? __do_page_fault+0x177/0x4f0 Sep 2 08:16:18 instance-1 kernel: [34987645.229813] [<ffffffff8109d237>] ? put_prev_entity+0x57/0x350 Sep 2 08:16:18 instance-1 kernel: [34987645.236015] [<ffffffff8109c0a6>] ? set_next_entity+0x56/0x70 Sep 2 08:16:18 instance-1 kernel: [34987645.242146] [<ffffffff810a2e71>] ? pick_next_task_fair+0x6e1/0x820 Sep 2 08:16:18 instance-1 kernel: [34987645.248870] [<ffffffff810115dc>] ? __switch_to+0x15c/0x5a0 Sep 2 08:16:18 instance-1 kernel: [34987645.254812] [<ffffffff81516228>] ? page_fault+0x28/0x30 Sep 2 08:16:18 instance-1 kernel: [34987645.260832] Mem-Info: Sep 2 08:16:18 instance-1 kernel: [34987645.263586] Node 0 DMA per-cpu: Sep 2 08:16:18 instance-1 kernel: [34987645.267258] CPU 0: hi: 0, btch: 1 usd: 0 Sep 2 08:16:18 instance-1 kernel: [34987645.272519] Node 0 DMA32 per-cpu: Sep 2 08:16:18 instance-1 kernel: [34987645.276345] CPU 0: hi: 186, btch: 31 usd: 76 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] active_anon:126526 inactive_anon:3096 isolated_anon:0 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] active_file:813 inactive_file:900 isolated_file:0 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] unevictable:0 dirty:0 writeback:0 unstable:0 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] free:8071 slab_reclaimable:2225 slab_unreclaimable:4588 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] mapped:1028 shmem:3130 pagetables:1213 bounce:0 Sep 2 08:16:18 instance-1 kernel: [34987645.281531] free_cma:0 Sep 2 08:16:18 instance-1 kernel: [34987645.314947] Node 0 DMA free:3088kB min:788kB low:984kB high:1180kB active_anon:11608kB inactive_anon:108kB active_file:12kB inactive_file:152kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:112kB slab_reclaimable:88kB slab_unreclaimable:480kB kernel_stack:16kB pagetables:52kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:522 all_unreclaimable? yes Sep 2 08:16:18 instance-1 kernel: [34987645.356698] lowmem_reserve[]: 0 576 576 576 Sep 2 08:16:18 instance-1 kernel: [34987645.361878] Node 0 DMA32 free:29196kB min:29300kB low:36624kB high:43948kB active_anon:494496kB inactive_anon:12276kB active_file:3240kB inactive_file:3448kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:612340kB managed:592796kB mlocked:0kB dirty:0kB writeback:0kB mapped:4112kB shmem:12408kB slab_reclaimable:8812kB slab_unreclaimable:17872kB kernel_stack:2320kB pagetables:4800kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:11577 all_unreclaimable? yes Sep 2 08:16:18 instance-1 kernel: [34987645.406481] lowmem_reserve[]: 0 0 0 0 Sep 2 08:16:18 instance-1 kernel: [34987645.411143] Node 0 DMA: 22*4kB (UE) 19*8kB (UEM) 12*16kB (UEM) 7*32kB (UEM) 4*64kB (UEM) 1*128kB (U) 0*256kB 0*512kB 0*1024kB 1*2048kB (R) 0*4096kB = 3088kB Sep 2 08:16:18 instance-1 kernel: [34987645.428083] Node 0 DMA32: 383*4kB (E) 310*8kB (UEM) 450*16kB (UEM) 200*32kB (UEM) 109*64kB (EM) 4*128kB (E) 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB (R) = 29196kB Sep 2 08:16:18 instance-1 kernel: [34987645.445684] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Sep 2 08:16:18 instance-1 kernel: [34987645.454775] 4860 total pagecache pages Sep 2 08:16:18 instance-1 kernel: [34987645.458908] 0 pages in swap cache Sep 2 08:16:18 instance-1 kernel: [34987645.462650] Swap cache stats: add 0, delete 0, find 0/0 Sep 2 08:16:18 instance-1 kernel: [34987645.468284] Free swap = 0kB Sep 2 08:16:18 instance-1 kernel: [34987645.471547] Total swap = 0kB Sep 2 08:16:18 instance-1 kernel: [34987645.474838] 157083 pages RAM Sep 2 08:16:18 instance-1 kernel: [34987645.478109] 0 pages HighMem/MovableOnly Sep 2 08:16:18 instance-1 kernel: [34987645.482323] 4886 pages reserved Sep 2 08:16:18 instance-1 kernel: [34987645.485853] 0 pages hwpoisoned Sep 2 08:16:18 instance-1 kernel: [34987645.489270] [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name Sep 2 08:16:18 instance-1 kernel: [34987645.497494] [ 311] 0 311 6350 1726 14 0 0 dhclient Sep 2 08:16:18 instance-1 kernel: [34987645.506101] [ 358] 0 358 6869 60 18 0 0 cron Sep 2 08:16:18 instance-1 kernel: [34987645.514339] [ 369] 0 369 64668 459 29 0 0 rsyslogd Sep 2 08:16:18 instance-1 kernel: [34987645.522954] [ 373] 0 373 1064 38 8 0 0 acpid Sep 2 08:16:18 instance-1 kernel: [34987645.531266] [ 406] 0 406 3604 38 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.539669] [ 407] 0 407 3604 38 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.548081] [ 408] 0 408 3604 40 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.556571] [ 409] 0 409 3604 40 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.564986] [ 410] 0 410 3604 39 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.573414] [ 411] 0 411 3604 39 12 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.583546] [ 412] 0 412 3559 40 10 0 0 agetty Sep 2 08:16:18 instance-1 kernel: [34987645.591939] [ 7263] 0 7263 13796 168 29 0 -1000 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.600464] [11774] 107 11774 10565 124 25 0 -900 dbus-daemon Sep 2 08:16:18 instance-1 kernel: [34987645.610085] [20473] 104 20473 7292 146 19 0 0 ntpd Sep 2 08:16:18 instance-1 kernel: [34987645.618585] [27741] 0 27741 13169 2273 30 0 0 google_accounts Sep 2 08:16:18 instance-1 kernel: [34987645.627869] [27744] 0 27744 13211 2284 29 0 0 google_clock_sk Sep 2 08:16:18 instance-1 kernel: [34987645.637039] [27747] 0 27747 13211 2244 30 0 0 google_ip_forwa Sep 2 08:16:18 instance-1 kernel: [34987645.646401] [14807] 0 14807 10176 101 22 0 -1000 systemd-udevd Sep 2 08:16:18 instance-1 kernel: [34987645.655412] [30481] 0 30481 1085 43 6 0 0 mysqld_safe Sep 2 08:16:18 instance-1 kernel: [34987645.664327] [30815] 109 30815 221020 12045 81 0 0 mysqld Sep 2 08:16:18 instance-1 kernel: [34987645.672765] [15984] 0 15984 7218 64 19 0 0 systemd-journal Sep 2 08:16:18 instance-1 kernel: [34987645.681934] [19949] 108 19949 547956 45017 173 0 0 java Sep 2 08:16:18 instance-1 kernel: [34987645.690161] [23671] 0 23671 10560 86 26 0 0 cron Sep 2 08:16:18 instance-1 kernel: [34987645.698380] [23672] 0 23672 1085 22 7 0 0 sh Sep 2 08:16:18 instance-1 kernel: [34987645.706415] [23673] 0 23673 1057 20 8 0 0 run-parts Sep 2 08:16:18 instance-1 kernel: [34987645.715058] [23674] 0 23674 1085 37 6 0 0 apt Sep 2 08:16:18 instance-1 kernel: [34987645.723279] [23793] 0 23793 28771 5257 62 0 0 unattended-upgr Sep 2 08:16:18 instance-1 kernel: [34987645.732642] [23803] 0 23803 28579 5281 57 0 0 unattended-upgr Sep 2 08:16:18 instance-1 kernel: [34987645.741809] [24237] 0 24237 4583 418 14 0 0 dpkg Sep 2 08:16:18 instance-1 kernel: [34987645.750026] [24239] 0 24239 1085 23 7 0 0 google-cloud-sd Sep 2 08:16:18 instance-1 kernel: [34987645.759214] [24241] 0 24241 62608 51157 126 0 0 python2 Sep 2 08:16:18 instance-1 kernel: [34987645.767782] [24263] 0 24263 12231 155 28 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.775989] [24265] 0 24265 10553 79 26 0 0 cron Sep 2 08:16:18 instance-1 kernel: [34987645.784795] [24266] 0 24266 12203 131 27 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.793015] [24267] 0 24267 12203 132 25 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.801461] [24268] 0 24268 12203 85 25 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.809715] [24270] 0 24270 12203 85 25 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.817941] [24271] 0 24271 12203 82 25 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.826202] [24272] 0 24272 12203 68 24 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.834413] [24273] 0 24273 12203 66 26 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.842619] [24274] 0 24274 12203 65 25 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.850850] [24275] 0 24275 4527 26 11 0 0 sshd Sep 2 08:16:18 instance-1 kernel: [34987645.859165] Out of memory: Kill process 24241 (python2) score 326 or sacrifice child Sep 2 08:16:18 instance-1 kernel: [34987645.867298] Killed process 24241 (python2) total-vm:250432kB, anon-rss:204628kB, file-rss:0kB Sep 2 16:21:27 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 2 16:21:27 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 2 16:21:27 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 40860 seconds. Sep 2 21:14:06 instance-1 systemd[1]: Starting Cleanup of Temporary Directories... Sep 2 21:14:06 instance-1 systemd[1]: Started Cleanup of Temporary Directories. Sep 3 03:42:27 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 3 03:42:27 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 3 03:42:27 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 34630 seconds. Sep 3 13:19:37 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 3 13:19:37 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 3 13:19:38 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 33626 seconds. Sep 3 21:14:22 instance-1 systemd[1]: Starting Cleanup of Temporary Directories... Sep 3 21:14:22 instance-1 systemd[1]: Started Cleanup of Temporary Directories. Sep 3 22:40:04 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 3 22:40:04 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 3 22:40:04 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 38182 seconds. Sep 4 09:16:26 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 4 09:16:26 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 4 09:16:26 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 35099 seconds. Sep 4 19:01:25 instance-1 dhclient: DHCPREQUEST on eth0 to 169.254.169.254 port 67 Sep 4 19:01:25 instance-1 dhclient: DHCPACK from 169.254.169.254 Sep 4 19:01:25 instance-1 dhclient: bound to 10.132.0.2 -- renewal in 40004 seconds. Sep 4 21:14:26 instance-1 systemd[1]: Starting Cleanup of Temporary Directories... Sep 4 21:14:26 instance-1 systemd[1]: Started Cleanup of Temporary Directories.