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# Анализ логов
## Введение
Во время своей работы ОС Linux ведет журнал происходящих событий уровня ядра и userspace. Стоит задача извлекать из журнала события, представляющие интерес для аналитики и статистики.
Лог в текстовом формате можно получить следующей командой от root:
`journalctl -b 0`
Лог в формате JSON можно получить следующей командой от root:
`journalctl -b 0 -o json`
Пример находится в [data/journalctl.txt](data/journalctl.txt)
Для форматирования JSON можно использовать утилиту jq(1):
`journalctl -b 0 -o json | jq "."`
[data/journalctl.json](data/journalctl.json)
Далее по тексту приводятся выдержки из этих файлов. Т.к. формат JSON обычно удобнее для машинной обработки, приводятся выдержки из него. Все те же самые события есть и в текстовом формате.
Механизм централизованного сбора логов находится за рамками настоящего документа.
Уникальный идентификатор устройства находится в файле `/etc/machine-id`. При установке по PXE необходимо обеспечивать его уникальность.
## События
### Включение устройства
Это первое сообщение в логе. В качестве сообщения выводится uname.
```json
{
"_TRANSPORT": "kernel",
"_SOURCE_MONOTONIC_TIMESTAMP": "0",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2290;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=4fca9f;t=5e8a389e7ec27;x=b5c2a95c90f7981c",
"PRIORITY": "5",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"__REALTIME_TIMESTAMP": "1663163974544423",
"SYSLOG_FACILITY": "0",
"__MONOTONIC_TIMESTAMP": "5229215",
"_HOSTNAME": "ncco-2-icl1.local",
"SYSLOG_IDENTIFIER": "kernel",
"MESSAGE": "Linux version 5.10.137-std-def-alt1 (builder@localhost.localdomain) (gcc-10 (GCC) 10.3.1 20210703 (ALT Sisyphus 10.3.1-alt2), GNU ld (GNU Binutils) 2.35.2.20210110) #1 SMP Wed Aug 24 12:31:53 UTC 2022"
}
```
### Выключение устройства
Рекомендуется ориентироваться на вход системы в target systemd `poweroff.target`
```json
{
"_SYSTEMD_SLICE": "-.slice",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"MESSAGE": "Reached target System Power Off.",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2ce0;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=809f16e0;t=5e8a409eca4e6;x=ab8da413467f46ce",
"_EXE": "/lib/systemd/systemd",
"UNIT": "poweroff.target",
"CODE_FUNC": "job_emit_done_message",
"TID": "1",
"_COMM": "systemd",
"SYSLOG_FACILITY": "3",
"_HOSTNAME": "ncco-2-icl1.local",
"_SOURCE_REALTIME_TIMESTAMP": "1663166122337374",
"CODE_LINE": "713",
"_SYSTEMD_UNIT": "init.scope",
"_CMDLINE": "/sbin/init splash",
"_UID": "0",
"SYSLOG_IDENTIFIER": "systemd",
"CODE_FILE": "src/core/job.c",
"__REALTIME_TIMESTAMP": "1663166122337510",
"MESSAGE_ID": "39f53479d3a045ac8e11786248231fbf",
"_SYSTEMD_CGROUP": "/init.scope",
"__MONOTONIC_TIMESTAMP": "2157909728",
"INVOCATION_ID": "1a99252c4e3a4100b16709983339fcc4",
"_TRANSPORT": "journal",
"_GID": "0",
"_PID": "1",
"JOB_ID": "3255",
"PRIORITY": "6",
"JOB_TYPE": "start",
"_CAP_EFFECTIVE": "1ffffffffff",
"JOB_RESULT": "done",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d"
}
```
### Логин в устройство
Можно смотреть события PAM, например:
```json
{
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=280f;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=e36ed39;t=5e8a397cf0ec1;x=53746d37c153ddc",
"MESSAGE": "pam_tcb(sddm:auth): Authentication passed for teacher from (uid=0)",
"__MONOTONIC_TIMESTAMP": "238480697",
"_HOSTNAME": "ncco-2-icl1.local",
"_CMDLINE": "/usr/libexec/sddm/sddm-helper --socket /tmp/sddm-authadababf6-da82-470f-a58a-f09332c714af --id 1 --start /usr/lib/kf5/bin/startplasma-x11 --user teacher",
"_SYSTEMD_CGROUP": "/system.slice/prefdm.service",
"_SYSTEMD_INVOCATION_ID": "d01e87e665194c96a1e2260288444968",
"_UID": "0",
"_COMM": "sddm-helper",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_TRANSPORT": "syslog",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"SYSLOG_TIMESTAMP": "Sep 14 17:03:27 ",
"_PID": "2761",
"_SOURCE_REALTIME_TIMESTAMP": "1663164207795860",
"PRIORITY": "6",
"_GID": "0",
"_SYSTEMD_UNIT": "prefdm.service",
"_EXE": "/usr/libexec/sddm/sddm-helper",
"_CAP_EFFECTIVE": "1ffffffffff",
"_SYSTEMD_SLICE": "system.slice",
"SYSLOG_FACILITY": "10",
"__REALTIME_TIMESTAMP": "1663164207795905",
"SYSLOG_IDENTIFIER": "sddm-helper"
}
```
Однако будет удобнее ориентироваться на запуск `user-$UID.slice`:
```json
{
"_SYSTEMD_CGROUP": "/init.scope",
"SYSLOG_FACILITY": "3",
"_UID": "0",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"JOB_RESULT": "done",
"SYSLOG_IDENTIFIER": "systemd",
"__REALTIME_TIMESTAMP": "1663164207801126",
"JOB_ID": "1480",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=281a;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=e37019e;t=5e8a397cf2326;x=3103dcbe46f278c8",
"_CMDLINE": "/sbin/init splash",
"PRIORITY": "6",
"_GID": "0",
"_SYSTEMD_UNIT": "init.scope",
"INVOCATION_ID": "11a0b0538275491d9f27021fde8251a5",
"CODE_FUNC": "job_emit_done_message",
"MESSAGE_ID": "39f53479d3a045ac8e11786248231fbf",
"UNIT": "user-500.slice",
"__MONOTONIC_TIMESTAMP": "238485918",
"_COMM": "systemd",
"JOB_TYPE": "start",
"CODE_LINE": "713",
"CODE_FILE": "src/core/job.c",
"_SOURCE_REALTIME_TIMESTAMP": "1663164207801121",
"_CAP_EFFECTIVE": "1ffffffffff",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_HOSTNAME": "ncco-2-icl1.local",
"TID": "1",
"_SYSTEMD_SLICE": "-.slice",
"_EXE": "/lib/systemd/systemd",
"_TRANSPORT": "journal",
"MESSAGE": "Created slice User Slice of UID 500.",
"_PID": "1"
}
```
### Блокировка устройства
Сейчас нормально не логируется. Можно попробовать сделать службу, запускаемую при наступлении нужной target systemd. Или что-то делать (писать в лог), когда polkit выдает разрешение на блокировку.
### Разблокировка устройства
Стоит повысить качество логирования приблизительно как описано выше, однако можно видеть события, когда разблокировщик прошел авторизацию:
```json
{
"SYSLOG_FACILITY": "10",
"_SOURCE_REALTIME_TIMESTAMP": "1663164791279391",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_EXE": "/usr/libexec/kf5/kcheckpass",
"_SYSTEMD_USER_SLICE": "-.slice",
"PRIORITY": "6",
"_HOSTNAME": "ncco-2-icl1.local",
"_SYSTEMD_INVOCATION_ID": "9297989dd5504b23a850c1a77e02d08c",
"_TRANSPORT": "syslog",
"SYSLOG_PID": "3495",
"_GID": "500",
"SYSLOG_TIMESTAMP": "Sep 14 17:13:11 ",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_UID": "500",
"SYSLOG_IDENTIFIER": "kcheckpass",
"__CURSOR": "s=67dc1471c824495d8b7ca28b2a9a0b85;i=2939;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=3148c14d;t=5e8a3ba964f53;x=f7329ba3eda2e7c7",
"_SYSTEMD_SLICE": "user-500.slice",
"_SYSTEMD_OWNER_UID": "500",
"_SYSTEMD_CGROUP": "/user.slice/user-500.slice/session-4.scope",
"_SYSTEMD_SESSION": "4",
"_CMDLINE": "kcheckpass -m classic -S 30",
"_CAP_EFFECTIVE": "0",
"_AUDIT_LOGINUID": "500",
"__REALTIME_TIMESTAMP": "1663164791279443",
"_AUDIT_SESSION": "4",
"_PID": "3495",
"MESSAGE": "pam_tcb(kf5-screenlocker:auth): Authentication passed for teacher from teacher(uid=500)",
"_SYSTEMD_UNIT": "session-4.scope",
"_COMM": "kcheckpass",
"__MONOTONIC_TIMESTAMP": "826851661"
}
```
### Подключение стороннего устройства
Данные события отражаются в логе ядра (`dmesg`) и дублируются в `journalctl`, при необходимости можно вешать ionotify на `/sys`.
Подключение USB-флешки:
```json
{
"PRIORITY": "6",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"SYSLOG_IDENTIFIER": "kernel",
"_SOURCE_MONOTONIC_TIMESTAMP": "852503228",
"__REALTIME_TIMESTAMP": "1663164816917389",
"_KERNEL_DEVICE": "+usb:1-2",
"_TRANSPORT": "kernel",
"MESSAGE": "usb 1-2: new high-speed USB device number 4 using xhci_hcd",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=293d;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=32cff589;t=5e8a3bc1d838d;x=564ac454a42de005",
"__MONOTONIC_TIMESTAMP": "852489609",
"_KERNEL_SUBSYSTEM": "usb",
"_HOSTNAME": "ncco-2-icl1.local",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"SYSLOG_FACILITY": "0"
}
```
```json
{
"_KERNEL_DEVICE": "+usb:1-2:1.0",
"PRIORITY": "6",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2940;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=32d2859b;t=5e8a3bc2013a1;x=30d8b837a01ad916",
"_KERNEL_SUBSYSTEM": "usb",
"_HOSTNAME": "ncco-2-icl1.local",
"_UDEV_SYSNAME": "1-2:1.0",
"SYSLOG_IDENTIFIER": "kernel",
"__MONOTONIC_TIMESTAMP": "852657563",
"MESSAGE": "usb-storage 1-2:1.0: USB Mass Storage device detected",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_TRANSPORT": "kernel",
"_SOURCE_MONOTONIC_TIMESTAMP": "852671778",
"__REALTIME_TIMESTAMP": "1663164817085345",
"SYSLOG_FACILITY": "0",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d"
}
```
```
{
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=294c;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=32e33ee3;t=5e8a3bc30cce8;x=f090741ef2f21e1e",
"PRIORITY": "5",
"_SOURCE_MONOTONIC_TIMESTAMP": "853767704",
"_HOSTNAME": "ncco-2-icl1.local",
"SYSLOG_IDENTIFIER": "kernel",
"_KERNEL_SUBSYSTEM": "scsi",
"_UDEV_SYSNAME": "3:0:0:0",
"_TRANSPORT": "kernel",
"MESSAGE": "sd 3:0:0:0: [sdb] Attached SCSI removable disk",
"__REALTIME_TIMESTAMP": "1663164818181352",
"__MONOTONIC_TIMESTAMP": "853753571",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_KERNEL_DEVICE": "+scsi:3:0:0:0",
"SYSLOG_FACILITY": "0"
}
```
### Отключение стороннего устройства
Отключение USB-флешки:
```json
{
"__REALTIME_TIMESTAMP": "1663165049801310",
"_KERNEL_SUBSYSTEM": "usb",
"_HOSTNAME": "ncco-2-icl1.local",
"_UDEV_SYSNAME": "1-2",
"MESSAGE": "usb 1-2: USB disconnect, device number 4",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_UDEV_DEVNODE": "/dev/bus/usb/001/004",
"PRIORITY": "6",
"_KERNEL_DEVICE": "c189:3",
"__MONOTONIC_TIMESTAMP": "1085373528",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_SOURCE_MONOTONIC_TIMESTAMP": "1085390460",
"SYSLOG_FACILITY": "0",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2abc;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=40b17c58;t=5e8a3c9ff0a5e;x=ef8248b678039a0f",
"_TRANSPORT": "kernel",
"SYSLOG_IDENTIFIER": "kernel"
}
```
### Подключение к Wi-Fi
```json
{
"SYSLOG_PID": "2443",
"_CAP_EFFECTIVE": "200534e2",
"__REALTIME_TIMESTAMP": "1663164210362279",
"_HOSTNAME": "ncco-2-icl1.local",
"_GID": "0",
"CODE_LINE": "2483",
"_SYSTEMD_INVOCATION_ID": "9bb6fc2091444ee9856ef1db55a5def0",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=28b0;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=e5e161f;t=5e8a397f637a7;x=ee8629ba9894c074",
"NM_DEVICE": "wlp0s20f3",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"__MONOTONIC_TIMESTAMP": "241047071",
"PRIORITY": "6",
"SYSLOG_IDENTIFIER": "NetworkManager",
"NM_LOG_LEVEL": "INFO",
"CODE_FILE": "src/core/devices/wifi/nm-device-wifi.c",
"_SYSTEMD_SLICE": "system.slice",
"NM_LOG_DOMAINS": "WIFI,DEVICE",
"_SOURCE_REALTIME_TIMESTAMP": "1663164210362119",
"_SYSTEMD_CGROUP": "/system.slice/NetworkManager.service",
"_PID": "2443",
"_UID": "0",
"TIMESTAMP_MONOTONIC": "235.046905",
"_SYSTEMD_UNIT": "NetworkManager.service",
"_COMM": "NetworkManager",
"_CMDLINE": "/usr/sbin/NetworkManager --no-daemon",
"MESSAGE": "<info> [1663164210.3621] device (wlp0s20f3): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network \"DigitalCenter_5G\"",
"_EXE": "/usr/sbin/NetworkManager",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"TIMESTAMP_BOOTTIME": "241.046905",
"_TRANSPORT": "journal",
"SYSLOG_FACILITY": "3"
}
```
### Отключение Wi-Fi
```json
{
"MESSAGE": "<info> [1663164926.3556] device (wlp0s20f3): state change: activated -> deactivating (reason 'user-requested', sys-iface-state: 'managed')",
"__REALTIME_TIMESTAMP": "1663164926355785",
"SYSLOG_FACILITY": "3",
"_EXE": "/usr/sbin/NetworkManager",
"NM_DEVICE": "wlp0s20f3",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_SYSTEMD_INVOCATION_ID": "9bb6fc2091444ee9856ef1db55a5def0",
"_UID": "0",
"TIMESTAMP_MONOTONIC": "955.927898",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=29fa;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=3955db44;t=5e8a3c2a36949;x=8d461b4a324f3fb9",
"_SYSTEMD_CGROUP": "/system.slice/NetworkManager.service",
"CODE_LINE": "16516",
"_CMDLINE": "/usr/sbin/NetworkManager --no-daemon",
"TIMESTAMP_BOOTTIME": "961.927898",
"CODE_FILE": "src/core/devices/nm-device.c",
"PRIORITY": "6",
"SYSLOG_PID": "2443",
"_CAP_EFFECTIVE": "200534e2",
"_GID": "0",
"NM_LOG_LEVEL": "INFO",
"_SYSTEMD_UNIT": "NetworkManager.service",
"_SYSTEMD_SLICE": "system.slice",
"SYSLOG_IDENTIFIER": "NetworkManager",
"_TRANSPORT": "journal",
"NM_LOG_DOMAINS": "DEVICE",
"__MONOTONIC_TIMESTAMP": "961928004",
"_PID": "2443",
"_HOSTNAME": "ncco-2-icl1.local",
"_SOURCE_REALTIME_TIMESTAMP": "1663164926355747",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_COMM": "NetworkManager"
}
```
### Подключение Ethernet
```json
{
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_COMM": "NetworkManager",
"__MONOTONIC_TIMESTAMP": "1040164086",
"NM_LOG_DOMAINS": "DEVICE",
"_UID": "0",
"_GID": "0",
"TIMESTAMP_MONOTONIC": "1034.164025",
"TIMESTAMP_BOOTTIME": "1040.164025",
"NM_DEVICE": "enp0s31f6",
"CODE_LINE": "16738",
"_CMDLINE": "/usr/sbin/NetworkManager --no-daemon",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2a4e;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=3dffa4f6;t=5e8a3c74d32fc;x=9effed904fd09e8b",
"_SOURCE_REALTIME_TIMESTAMP": "1663165004591824",
"_SYSTEMD_SLICE": "system.slice",
"_SYSTEMD_CGROUP": "/system.slice/NetworkManager.service",
"SYSLOG_PID": "2443",
"_CAP_EFFECTIVE": "200534e2",
"_PID": "2443",
"SYSLOG_FACILITY": "3",
"CODE_FILE": "src/core/devices/nm-device.c",
"__REALTIME_TIMESTAMP": "1663165004591868",
"SYSLOG_IDENTIFIER": "NetworkManager",
"_HOSTNAME": "ncco-2-icl1.local",
"MESSAGE": "<info> [1663165004.5918] device (enp0s31f6): Activation: successful, device activated.",
"NM_LOG_LEVEL": "INFO",
"_TRANSPORT": "journal",
"_SYSTEMD_INVOCATION_ID": "9bb6fc2091444ee9856ef1db55a5def0",
"PRIORITY": "6",
"_EXE": "/usr/sbin/NetworkManager",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_SYSTEMD_UNIT": "NetworkManager.service"
}
```
### Отключение Ethernet
Событие физического отсоединения кабеля:
```
{
"__REALTIME_TIMESTAMP": "1663165006597376",
"__MONOTONIC_TIMESTAMP": "1042169594",
"_UDEV_SYSNAME": "0000:00:1f.6",
"PRIORITY": "6",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"_KERNEL_DEVICE": "+pci:0000:00:1f.6",
"_HOSTNAME": "ncco-2-icl1.local",
"_TRANSPORT": "kernel",
"MESSAGE": "e1000e-ext 0000:00:1f.6 enp0s31f6: NIC Link is Down",
"SYSLOG_IDENTIFIER": "kernel",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2a56;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=3e1e3efa;t=5e8a3c76bcd00;x=9fcd1e133f0bb261",
"SYSLOG_FACILITY": "0",
"_KERNEL_SUBSYSTEM": "pci",
"_SOURCE_MONOTONIC_TIMESTAMP": "1042186286"
}
```
Событие программного выключения (в данном случае оно автоматически последовало за физическим отсоединением кабеля):
```
{
"_SOURCE_REALTIME_TIMESTAMP": "1663165012599797",
"_CMDLINE": "/usr/sbin/NetworkManager --no-daemon",
"TIMESTAMP_BOOTTIME": "1048.171939",
"SYSLOG_IDENTIFIER": "NetworkManager",
"NM_LOG_DOMAINS": "DEVICE",
"CODE_FILE": "src/core/devices/nm-device.c",
"SYSLOG_FACILITY": "3",
"_SYSTEMD_SLICE": "system.slice",
"_TRANSPORT": "journal",
"NM_DEVICE": "enp0s31f6",
"MESSAGE": "<info> [1663165012.5997] device (enp0s31f6): state change: activated -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')",
"__CURSOR": "s=b45ff6a034b548efbbc4ddb9caf572a2;i=2a57;b=b7c4b78ba3cb403ea89f99ea2801a34d;m=3e79d622;t=5e8a3c7c76428;x=1140c064ad71ca6a",
"PRIORITY": "6",
"__REALTIME_TIMESTAMP": "1663165012599848",
"__MONOTONIC_TIMESTAMP": "1048172066",
"_MACHINE_ID": "446da133a2cb49efbe840eb66307756b",
"TIMESTAMP_MONOTONIC": "1042.171939",
"_GID": "0",
"_SYSTEMD_UNIT": "NetworkManager.service",
"_EXE": "/usr/sbin/NetworkManager",
"NM_LOG_LEVEL": "INFO",
"CODE_LINE": "16516",
"_PID": "2443",
"_SYSTEMD_CGROUP": "/system.slice/NetworkManager.service",
"_BOOT_ID": "b7c4b78ba3cb403ea89f99ea2801a34d",
"SYSLOG_PID": "2443",
"_COMM": "NetworkManager",
"_CAP_EFFECTIVE": "200534e2",
"_UID": "0",
"_SYSTEMD_INVOCATION_ID": "9bb6fc2091444ee9856ef1db55a5def0",
"_HOSTNAME": "ncco-2-icl1.local"
}
```
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