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0032_Boot_Dir_Support_SSH_Auto_Run.md

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0032_Boot_Dir_Support_SSH_Auto_Run.md

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Boot Dir Support SSH Auto Run

分析自动打开SSH和网络配置原理

raspberrypi-net-mods.service

  • ls -al /etc/systemd/system/multi-user.target.wants/raspberrypi-net-mods.service 
    lrwxrwxrwx 1 root root 48 Jul 10 01:10 /etc/systemd/system/multi-user.target.wants/raspberrypi-net-mods.service -> /lib/systemd/system/raspberrypi-net-mods.service
  • /lib/systemd/system/raspberrypi-net-mods.service 
    [Unit]
Description=Copy user wpa_supplicant.conf
ConditionPathExists=/boot/wpa_supplicant.conf
Before=dhcpcd.service
After=systemd-rfkill.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/mv /boot/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf
ExecStartPost=/bin/chmod 600 /etc/wpa_supplicant/wpa_supplicant.conf
ExecStartPost=/usr/sbin/rfkill unblock wifi

[Install]
WantedBy=multi-user.target

sshwitch.service

  • ls -al /etc/systemd/system/multi-user.target.wants/sshswitch.service 
    lrwxrwxrwx 1 root root 37 Jul 10 01:08 /etc/systemd/system/multi-user.target.wants/sshswitch.service -> /lib/systemd/system/sshswitch.service
  • /lib/systemd/system/sshswitch.service 
    [Unit]
Description=Turn on SSH if /boot/ssh is present
ConditionPathExistsGlob=/boot/ssh{,.txt}
After=regenerate_ssh_host_keys.service

[Service]
Type=oneshot
ExecStart=/bin/sh -c "update-rc.d ssh enable && invoke-rc.d ssh start && rm -f /boot/ssh ; rm -f /boot/ssh.txt"

[Install]
WantedBy=multi-user.target
  • whereis update-rc.d 
    update-rc: /usr/sbin/update-rc.d