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# Задание 1
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1. Если у вас есть машина с графической оболочкой, в консоли перейдите в уровень запуска `multi-user.target` без перезагрузки, а затем обратно `graphical.target`.
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```
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# systemctl isolate multi-user.target
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# systemctl isolate graphical.target
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```
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2. Если у вас есть машина с графической оболочкой, перейдите в уровень запуска `multi-user.target` с перезагрузкой, а затем переключитесь в графическую оболочку обратно.
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```
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# systemctl set-default multi-user.target
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# reboot
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# systemctl set-default graphical.target
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# reboot
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```
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3. Выведите модуль, который активируется по-умолчанию.
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```
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# systemctl get-default
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```
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4. Выведите возможные состояния модулей командой `systemctl --state=help`.
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```
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# systemctl --state=help
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```
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5. Найдите в man странице какие типы модулей есть в `systemd`.
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```
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# man systemctl
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The following unit types are available:
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1. Service units, which start and control daemons and the processes they consist of. For details, see systemd.service(5).
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2. Socket units, which encapsulate local IPC or network sockets in the system, useful for socket-based activation. For details about socket units, see systemd.socket(5), for details on socket-based activation and other forms of activation, see daemon(7).
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3. Target units are useful to group units, or provide well-known synchronization points during boot-up, see systemd.target(5).
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4. Device units expose kernel devices in systemd and may be used to implement device-based activation. For details, see
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systemd.device(5).
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5. Mount units control mount points in the file system, for details see systemd.mount(5).
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6. Automount units provide automount capabilities, for on-demand mounting of file systems as well as parallelized boot-up. See
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systemd.automount(5).
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7. Timer units are useful for triggering activation of other units based on timers. You may find details in systemd.timer(5).
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8. Swap units are very similar to mount units and encapsulate memory swap partitions or files of the operating system. They are
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described in systemd.swap(5).
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9. Path units may be used to activate other services when file system objects change or are modified. See systemd.path(5).
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10. Slice units may be used to group units which manage system processes (such as service and scope units) in a hierarchical tree for resource management purposes. See systemd.slice(5).
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11. Scope units are similar to service units, but manage foreign processes instead of starting them as well. See systemd.scope(5).
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```
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6. Выведите список установленных модулей.
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```
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# systemctl list-unit-files
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```
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7. Деактивируйте сервис `systemd-timesyncd`.
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```
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# systemctl disable systemd-timesyncd
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```
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8. Перезагрузите сервис `systemd-timesyncd`.
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```
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# systemctl restart systemd-timesyncd
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```
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9. Выведите список модулей в памяти.
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```
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# systemctl disable systemd-timesyncd
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```
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10. Проверьте, что сервис `systemd-timesyncd` активирован.
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```
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# systemctl is-enabled systemd-timesyncd
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```
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11. Выведите список зависимых модулей для сервиса `systemd-timesyncd`.
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```
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# systemctl list-dependencies systemd-timesyncd
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```
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12. Выведите список сокетов в памяти.
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```
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# systemctl list-sockets
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```
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13. Выведите список таймеров в памяти.
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```
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# systemctl list-timers
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```
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14. Проверьте статус сервиса `systemd-timesyncd`.
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```
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# systemctl status systemd-timesyncd
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```
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15. Проверьте, что сервис `systemd-timesyncd` активен.
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```
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# systemctl is-active systemd-timesyncd
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```
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16. Выведите список свойств модуля.
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```
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# systemctl show systemd-timesyncd
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```
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17. Выведите уровень логирования для сервиса `systemd-timesyncd`.
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```
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# systemctl service-log-level systemd-timesyncd
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```
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18. Перезагрузите конфигурацию systemd менеджера: перезапустите генераторы (systemd.generator), все модули и перестройте дерево зависимостей.
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```
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# systemctl daemon-reload
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```
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19. Какие префиксы можно использовать при указании исполняемых файлов в файлах .service.
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```
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# man systemd.service
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Table 1. Special executable prefixes
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┌───────┬──────────────────────────────────────────────────┐
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│Prefix │ Effect │
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├───────┼──────────────────────────────────────────────────┤
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│"@" │ If the executable path is prefixed with "@", the │
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│ │ second specified token will be passed as │
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│ │ "argv[0]" to the executed process (instead of │
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│ │ the actual filename), followed by the further │
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│ │ arguments specified. │
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├───────┼──────────────────────────────────────────────────┤
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│"-" │ If the executable path is prefixed with "-", an │
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│ │ exit code of the command normally considered a │
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│ │ failure (i.e. non-zero exit status or abnormal │
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│ │ exit due to signal) is recorded, but has no │
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│ │ further effect and is considered equivalent to │
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│ │ success. │
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├───────┼──────────────────────────────────────────────────┤
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│":" │ If the executable path is prefixed with ":", │
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│ │ environment variable substitution (as described │
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│ │ by the "Command Lines" section below) is not │
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│ │ applied. │
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├───────┼──────────────────────────────────────────────────┤
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│"+" │ If the executable path is prefixed with "+" then │
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│ │ the process is executed with full privileges. In │
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│ │ this mode privilege restrictions configured with │
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│ │ User=, Group=, CapabilityBoundingSet= or the │
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│ │ various file system namespacing options (such as │
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│ │ PrivateDevices=, PrivateTmp=) are not applied to │
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│ │ the invoked command line (but still affect any │
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│ │ other ExecStart=, ExecStop=, ... lines). │
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├───────┼──────────────────────────────────────────────────┤
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│"!" │ Similar to the "+" character discussed above │
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│ │ this permits invoking command lines with │
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│ │ elevated privileges. However, unlike "+" the "!" │
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│ │ character exclusively alters the effect of │
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│ │ User=, Group= and SupplementaryGroups=, i.e. │
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│ │ only the stanzas that affect user and group │
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│ │ credentials. Note that this setting may be │
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│ │ combined with DynamicUser=, in which case a │
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│ │ dynamic user/group pair is allocated before the │
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│ │ command is invoked, but credential changing is │
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│ │ left to the executed process itself. │
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├───────┼──────────────────────────────────────────────────┤
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│"!!" │ This prefix is very similar to "!", however it │
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│ │ only has an effect on systems lacking support │
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│ │ for ambient process capabilities, i.e. without │
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│ │ support for AmbientCapabilities=. It's intended │
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│ │ to be used for unit files that take benefit of │
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│ │ ambient capabilities to run processes with │
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│ │ minimal privileges wherever possible while │
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│ │ remaining compatible with systems that lack │
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│ │ ambient capabilities support. Note that when │
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│ │ "!!" is used, and a system lacking ambient │
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│ │ capability support is detected any configured │
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│ │ SystemCallFilter= and CapabilityBoundingSet= │
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│ │ stanzas are implicitly modified, in order to │
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│ │ permit spawned processes to drop credentials and │
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│ │ capabilities themselves, even if this is │
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│ │ configured to not be allowed. Moreover, if this │
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│ │ prefix is used and a system lacking ambient │
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│ │ capability support is detected │
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│ │ AmbientCapabilities= will be skipped and not be │
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│ │ applied. On systems supporting ambient │
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│ │ capabilities, "!!" has no effect and is │
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│ │ redundant. │
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└───────┴──────────────────────────────────────────────────┘
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```
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# Задание 2
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1. Настройте беспарольный доступ по ssh на localhost. Подтвердите добавление хоста в known_hosts.
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```
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# ssh-keygen
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# cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
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# ssh localhost
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```
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2. Сконфигурируйте сервис для прокси сервиса
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```
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# systemctl edit socksproxy --full --force
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```
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содержимое `/etc/systemd/system/socksproxy.service`
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```
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[Unit]
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Description=SocksProxy
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After=network.target
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[Service]
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ExecStart=/usr/bin/ssh -N -D 0.0.0.0:80 localhost
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Restart=always
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RestartSec=5s
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[Install]
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WantedBy=multi-user.target
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```
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3. Активируйте сервис и запустите
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```
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# systemctl enable socksproxy
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# systemctl start socksproxy
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```
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4. Проверьте, что socks сервер слушает порт 80
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```
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# netstat -tulpn
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```
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5. Определите свой внешний IP адрес на сайте http://ifconfig.me/, предварительно настроив в firefox плагине foxyproxy прокси сервер socks5 с адресом 193.32.63.170 + X к последнему октету, где X ваш идентификатор из studX.
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vlpr
1 year ago