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How to Bootup Oracle Linux 7.x into Rescue Mode or Emergency Mode Through Systemd (Doc ID 2153996.1)

Last updated on AUGUST 04, 2018

Applies to:

Linux OS - Version Oracle Linux 7.0 and later
Linux x86-64

Goal

This article explains how to bootup OL7 system into rescue mode or emergency mode.

In OL7, both rescue mode and emergency mode are systemd targets which replaced the concept of runlevels in previous OL versions.

Rescue mode is equivalent to single user mode and requires the root password.

Rescue mode allows you to repair your system in situations when it is unable to complete a regular booting process. Rescue mode will try to mount all local file systems and start some important system services, but it does not activate network interfaces neither allow multiple users to be logged in.

Emergency mode provides the most minimal environment possible and allows you to repair your system even in situations when the system is unable to enter rescue mode. In emergency mode, the system mounts the root file system as read-only, does not attempt to mount any other local file systems, does not activate network interfaces. 

In case the Linux OS could not bootup itself, please refer to How to Bootup Oracle Linux 7.x into Rescue Mode From ISO Image.

Solution

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In this Document
Goal
Solution
 Bootup into Emergency mode(target)
 Bootup into Rescue mode(target)
 Bootup into Debug Shell
 Switch to Emergency mode(target)
 Switch to Rescue mode(target)
References

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