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linuxtargetsystemd

Linux Backup target with minimal configuration

I'm running a RPi3 with 

Operating System: Raspbian GNU/Linux 9 (stretch)
Kernel: Linux 4.14.79-v7+
Architecture: arm

In order to do a automatic backup I'd like to kill all "user services" to guarantee the integrity of the backup (e.g. Webserver, databases and so on)

I found that you can create a .target for isolation mode, but I'm having difficulties to set it up.

Of course my backup.target needs network access (to mount a network storage). I'd also like to have ssh enabled, so I'm not locked out of my system.

I created backup-net.target with the following

[Unit]    
Description=Maintenance Mode with Networking and SSH                           
Requires=rescue.target network-online.target
Wants=sshd.service
After=rescue.target network-online.target
AllowIsolate=yes

But If i sudo systemctl isolate backup-net.target, my RPi disconnects from the network and i can't connect via ssh until I manually reboot it.

Solution

  • For anyone wondering, i managed to get it by:

    [Unit]
Description=Maintenance Mode with Networking and SSH                           $
Requires=rescue.target network-online.target dhcpcd.service
Wants=sshd.service wpa_supplicant.service
After=rescue.target network-online.target
AllowIsolate=yes

    as /lib/systemd/system/backup-net.target