Single-user mode, rescue mode, clone virtual machine, and Linux machine log in to each other

Single-User mode

Single-user equivalent to Windows security mode

First reboot Linux, a few common commands:

Reboot Init 6 Shutdown-r now

Shutdown command:

Init 0 Poweroff

Right > Power > Restart Client

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Grub interface, GRUB is a startup tool to find the system boot disk

Press the direction key to select the above

Press E to enter edit

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Find linux16 this line

Find RO (read-only) to RW (read-write) and add init=/sysroot/bin/sh

Sysroot is the directory where the original system resides

Ctrl+x

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This interface is equivalent to entering the "Safe Mode"

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Can see

ls/sysroot/boot/

ls/sysroot/tmp/

It's temporarily empty.

Cat/sysroot/root/.ssh/authorized_keys

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chroot/sysroot/

Cat/root/.ssh/authorized_keys can use the original system command at this time.

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passwd Root

Found garbled

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Ctrl +c cancel the currently running command

Execution: lang=en

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Run passwd Root again

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To run after the change:

Touch/.autorelabel

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After power > Restart client

Login successful

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If you forget your Grup password, you should use rescue mode

Run level from 0-6 total 7 levels

0: Turn off the machine

1: Single User

2 3 4: Multi-user mode

5: Graphical interface

6:reboot

Ls-l/usr/lib/systemd/system/runlevel*target

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First shutdown: Init 0

To edit the virtual machine again

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Ls/mnt/sysimage/root/.ssh/authorized_keys

Cat/mnt/sysimage/root/.ssh/authorized_keys

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Chroot/mnt/sysimage

passwd Root

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After changing the password, go to Settings,

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Restart:

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Login Test

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Landing success

Cloning a virtual machine

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Login serverlooker-02

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Change the IP of serverlooker-02

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Restart

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Test the external network, can ping through

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Change the host name of aminglinux-02: serverlooker-02

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Change the host name of aminglinux-01: serverlooker-01

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Add serverlooker-02 to Xshell

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Clone the aminglinux-02, spare.

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Linux machines log in to each other

Use the W command to view the terminals connected to the SERVERLOOKER-01

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Use serverlooker-02 to connect 01

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View current Login User WhoAmI

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Connect by specifying a port:

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Key authentication between two Linux implementations

Use 02 to connect 01

Tool: Ssh-keygen generate key pair

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Default carriage return, generating a key pair

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Copy 02 of the public key contents to 01

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VI Write

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01 of SELinux Off

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Use 02 even 01 without entering a password.

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The connection was successful.

This article is from the "Serverlooker" blog, make sure to keep this source http://13279218.blog.51cto.com/13269218/1974412

Single-user mode, rescue mode, clone virtual machine, and Linux machine log in to each other