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我无法调试为什么我的 nodeJS webapp 会被 Debian 11 中的 OOM killer 杀死。我正在使用 IONOS 的一个小型 VPS（VMware ESX 7.0.3 build-21313628），该 VPS 具有单核 1GHz CPU、512MB RAM、1.9GB 交换和 10GB SSD。
Web 应用程序使用 pm2 和 nginx 作为反向代理运行，我使用 certbot systemd 计时器进行自动 SSL 更新。
出现的问题如下：VPS 没有响应，我收到“严重 ping”警报。IONOS 仪表板中的统计数据大多数时候显示 CPU 使用率达到 100% 并保持在该水平，同时 RAM 使用率下降，并且 ping 时不再响应。这种情况随机发生，有时在运行一两周后，有时在 2 天后。服务器的软件重启有助于解决问题。在正常运行中，RAM 使用率约为 15-30%，CPU 使用率约为 10%。
我查看了 OOM killer 的日志，似乎该问题总是在 snapd 本身或 certbot 挂载时发生。
localhost systemd[1]: Mounting Mount unit for certbot, revision 3024...
mount invoked oom-killer
请参阅下面附加的完整日志：
/var/log/syslog.1-May 2 16:10:02 localhost snapd[749]: storehelpers.go:769: cannot refresh: snap has no updates available: "certbot", "core20"
/var/log/syslog.1-May 2 16:10:11 localhost systemd[1]: Reloading.
/var/log/syslog.1-May 2 16:10:12 localhost systemd[1]: Mounting Mount unit for snapd, revision 19122...
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.827965] mount invoked oom-killer: gfp_mask=0x40cc0(GFP_KERNEL|__GFP_COMP), order=3, oom_score_adj=0
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.828070] CPU: 0 PID: 34164 Comm: mount Not tainted 5.10.0-19-amd64 #1 Debian 5.10.149-2
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828102] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828144] Call Trace:
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828275] dump_stack+0x6b/0x83
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828312] dump_header+0x4a/0x1f4
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828335] oom_kill_process.cold+0xb/0x10
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828379] out_of_memory+0x1bd/0x4e0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828410] __alloc_pages_slowpath.constprop.0+0xbcc/0xc90
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828439] __alloc_pages_nodemask+0x2de/0x310
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828464] kmalloc_order+0x28/0x100
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828486] kmalloc_order_trace+0x19/0x90
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828520] xz_dec_lzma2_create+0x21/0x80
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828543] xz_dec_init+0x54/0xa0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828574] squashfs_xz_init+0x3d/0x60 [squashfs]
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828597] squashfs_decompressor_create+0x75/0x110 [squashfs]
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828623] squashfs_decompressor_setup+0x82/0x180 [squashfs]
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828658] squashfs_fill_super+0x338/0x8d0 [squashfs]
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828713] ? init_once+0x10/0x10 [squashfs]
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828747] get_tree_bdev+0x16d/0x260
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828771] vfs_get_tree+0x22/0xc0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828793] path_mount+0x458/0xa70
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828820] __x64_sys_mount+0x107/0x140
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828848] do_syscall_64+0x30/0x80
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828875] entry_SYSCALL_64_after_hwframe+0x61/0xc6
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828910] RIP: 0033:0x7f7fdc52e62a
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.828930] Code: 48 8b 0d 69 18 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 36 18 0d 00 f7 d8 64 89 01 48
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829032] RSP: 002b:00007ffdb673a008 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829139] RAX: ffffffffffffffda RBX: 00007f7fdc662264 RCX: 00007f7fdc52e62a
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829184] RDX: 0000563cc5ff0c80 RSI: 0000563cc5ff0c60 RDI: 0000563cc5ff7f90
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829223] RBP: 0000563cc5ff0a30 R08: 0000000000000000 R09: 00007f7fdc600be0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829259] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.829287] R13: 0000563cc5ff7f90 R14: 0000563cc5ff0c80 R15: 0000563cc5ff0a30
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.829323] Mem-Info:
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] active_anon:1169 inactive_anon:1417 isolated_anon:0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] active_file:734 inactive_file:980 isolated_file:0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] unevictable:0 dirty:12 writeback:6
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] slab_reclaimable:6041 slab_unreclaimable:47488
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] mapped:1105 shmem:21 pagetables:1039 bounce:0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.830356] free:1799 free_pcp:0 free_cma:0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.834868] Node 0 active_anon:4676kB inactive_anon:5668kB active_file:2936kB inactive_file:3920kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:4420kB dirty:48kB writeback:24kB shmem:84kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:5904kB all_unreclaimable? no
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.837038] Node 0 DMA free:1680kB min:96kB low:120kB high:144kB reserved_highatomic:0KB active_anon:16kB inactive_anon:44kB active_file:8kB inactive_file:4kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB pagetables:212kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.839128] lowmem_reserve[]: 0 388 388 388 388
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.839795] Node 0 DMA32 free:5516kB min:2472kB low:3088kB high:3704kB reserved_highatomic:2048KB active_anon:4660kB inactive_anon:5628kB active_file:2932kB inactive_file:3912kB unevictable:0kB writepending:32kB present:507776kB managed:434640kB mlocked:0kB pagetables:3944kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.841869] lowmem_reserve[]: 0 0 0 0 0
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.842599] Node 0 DMA: 9*4kB (U) 76*8kB (U) 65*16kB (UE) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1684kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.844121] Node 0 DMA32: 339*4kB (UMEH) 196*8kB (UMEH) 131*16kB (UMEH) 6*32kB (H) 1*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 5532kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.845672] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.846466] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.847312] 3047 total pagecache pages
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.848215] 1313 pages in swap cache
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.849004] Swap cache stats: add 16848324, delete 16847011, find 6908638/14622802
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.849850] Free swap = 1846492kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.850673] Total swap = 1998844kB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.855457] Name Used Total
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.856289] nf_conntrack 127KB 127KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.857122] ext4_system_zone 3KB 3KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.857977] scsi_sense_cache 296KB 296KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.858798] PINGv6 30KB 30KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.859626] RAWv6 339KB 339KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.860423] UDPv6 31KB 31KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.861217] tw_sock_TCPv6 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.862019] request_sock_TCPv6 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.862763] TCPv6 30KB 30KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.863490] mqueue_inode_cache 31KB 31KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.864215] UNIX 200KB 200KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.864939] RAW 512KB 512KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.865671] UDP 31KB 31KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.866386] tw_sock_TCP 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.867130] request_sock_TCP 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.867852] TCP 122KB 122KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.868540] hugetlbfs_inode_cache 31KB 31KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.869224] eventpoll_pwq 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.869907] request_queue 63KB 63KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.870618] biovec-max 272KB 368KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.871278] biovec-128 32KB 32KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.871961] biovec-64 32KB 32KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.872574] dmaengine-unmap-256 30KB 30KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.873165] dmaengine-unmap-128 31KB 31KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.873786] dmaengine-unmap-16 165KB 165KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.874333] skbuff_fclone_cache 32KB 32KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.874903] skbuff_head_cache 400KB 400KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.875429] file_lock_cache 7KB 7KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.875932] fsnotify_mark_connector 8KB 8KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.876455] net_namespace 30KB 30KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.876962] task_delay_info 51KB 51KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.877422] taskstats 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.877859] proc_dir_entry 149KB 149KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.878275] pde_opener 3KB 3KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.878687] seq_file 7KB 7KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.879065] shmem_inode_cache 759KB 759KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.879446] kernfs_node_cache 6076KB 6076KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.879814] mnt_cache 239KB 239KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.880184] filp 322KB 448KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.880541] names_cache 64KB 64KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.880887] lsm_file_cache 51KB 51KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.881232] uts_namespace 15KB 15KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.881582] vm_area_struct 767KB 914KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.881925] mm_struct 64KB 82KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.882267] files_cache 147KB 147KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.882621] signal_cache 441KB 441KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.882962] sighand_cache 682KB 744KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.883300] task_struct 2202KB 2315KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.883635] cred_jar 102KB 102KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.883972] anon_vma_chain 205KB 268KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.884311] anon_vma 226KB 304KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.884643] pid 64KB 64KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.884975] Acpi-Operand 452KB 452KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.885308] Acpi-Parse 7KB 7KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.885641] Acpi-State 7KB 7KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.885968] numa_policy 47KB 47KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.886292] trace_event_file 158KB 158KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.886628] ftrace_event_field 398KB 398KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.886952] pool_workqueue 64KB 64KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.887277] task_group 74KB 74KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.887603] vmap_area 144KB 144KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.887931] kmalloc-8k 448KB 448KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.888256] kmalloc-4k 116840KB 116840KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.888579] kmalloc-2k 3808KB 3808KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.888900] kmalloc-1k 1733KB 1828KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.889218] kmalloc-512 14202KB 15024KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.889570] kmalloc-256 1056KB 1056KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.889888] kmalloc-192 252KB 252KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.890201] kmalloc-128 264KB 264KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.890515] kmalloc-96 200KB 200KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.890839] kmalloc-64 556KB 556KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.891149] kmalloc-32 480KB 480KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.891456] kmalloc-16 200KB 200KB
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.891767] kmalloc-8 80KB 80KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.892063] kmem_cache_node 12KB 12KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.892357] kmem_cache 48KB 48KB
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.892681] Tasks state (memory values in pages):
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.892975] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.893310] [ 337] 0 337 36649 67 274432 224 -250 systemd-journal
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.893639] [ 352] 0 352 5461 93 69632 309 -1000 systemd-udevd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.893969] [ 419] 101 419 22110 0 73728 192 0 systemd-timesyn
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.894303] [ 436] 0 436 12569 0 86016 368 0 VGAuthService
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.894661] [ 437] 0 437 59708 33 90112 290 0 vmtoolsd
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.895006] [ 640] 0 640 24972 5 73728 335 0 dhclient
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.895354] [ 688] 0 688 24972 0 69632 375 0 dhclient
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.895696] [ 744] 0 744 2319 23 53248 42 0 cron
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.896040] [ 745] 104 745 1990 49 49152 95 -900 dbus-daemon
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.896392] [ 748] 0 748 55199 0 81920 593 0 rsyslogd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.896805] [ 749] 0 749 184028 508 241664 4259 -900 snapd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.897173] [ 751] 0 751 3475 58 73728 213 0 systemd-logind
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.897541] [ 753] 0 753 302239 0 274432 2909 -999 containerd
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.897934] [ 757] 0 757 2094 0 49152 28 0 agetty
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.898339] [ 761] 0 761 3339 8 65536 235 -1000 sshd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.898731] [ 785] 0 785 310713 0 364544 5526 -500 dockerd
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.899112] [ 1024] 1000 1024 3859 23 69632 349 0 systemd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.899496] [ 1026] 1000 1026 25612 2 102400 763 0 (sd-pam)
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.899884] [ 3877] 1000 3877 205117 1 942080 5054 0 PM2 v5.2.2: God
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.900278] [ 4064] 1000 4064 2828374 423 1187840 7610 0 node /var/www/t
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.900679] [ 5675] 0 5675 56818 0 176128 6802 0 nginx
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.901131] [ 22752] 33 22752 56818 4 172032 6776 0 nginx
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.901546] [ 34163] 0 34163 3167 5 65536 51 -900 systemctl
/var/log/syslog.1-May 2 16:10:13 localhost kernel: [168329.901963] [ 34164] 0 34164 2392 139 61440 20 0 mount
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.902384] [ 34166] 0 34166 5461 325 65536 250 0 systemd-udevd
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.902830] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=snap-snapd-19122.mount,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1000.slice/session-1.scope,task=node /var/www/t,pid=4064,uid=1000
/var/log/syslog.1:May 2 16:10:13 localhost kernel: [168329.903824] Out of memory: Killed process 4064 (node /var/www/t) total-vm:11313496kB, anon-rss:1692kB, file-rss:0kB, shmem-rss:0kB, UID:1000 pgtables:1160kB oom_score_adj:0
certbot ssl 续订的 systemd 计时器如下所示：
[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application certbot.renew
Requires=snap-certbot-3024.mount
Wants=network.target
After=snap-certbot-3024.mount network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run --timer="00:00~24:00/2" certbot.renew
SyslogIdentifier=certbot.renew
Restart=no
WorkingDirectory=/var/snap/certbot/3024
TimeoutStopSec=30
Type=oneshot
我现在不确定如何继续调试。我在网上找不到任何有意义的信息。VPS 的 CPU 和 RAM 是不是太小了，或者我能做些什么来防止出现问题？