Is there any way to restore the influxdb when its down ?
What do you mean by “restore”?
Do you mean “restart the service”?
Or do you mean “copy the database from a previous backup, or another server”?
If you mean the restart, it depends on your O/S and your init system, but
something along the lines fo “/etc/init.d/influxdb start” should work.
If you mean the database content, have you tried rsync?
Yes. I want to restore the database from backup.
I tried to take backup by following instructions on: https://influxdbcom.readthedocs.io/en/latest/content/docs/v0.9/administration/backup_and_restore/
I properly remember it worked before. But now, if influxd is not running then restore fails.