Today, a system engineer may need to manage and maintain multiple servers. Setting the key passwords of all servers as unified passwords will inevitably cause security risks, if each server has its own set of passwords, the number of passwords may be too large and confusing. It is common to forget the passwords. The younger brother will introduce new people with an opportunity to correct their mistakes..
Thoughts on changing the Administrator Password1. Delete the password file 2. crack the password file 3. bypass the password file
For Linux, we can choose the gentle 3rd methods mentioned above.1. try to enter single-user mode. In this mode, you can log on to the system without a password. in addition, a single user provides an administrator identity. 3. reset the administrator password as the current Administrator. restart and enter the system to test whether the system is successful
Procedure
CD-guided repair mode (one system disc)1. Select the boot sequence from the Cd {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357105766.jpg" border = "0" alt = ""> 2. Use CD boot, enter Linux rescue in recovery mode on the boot page {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357179760.jpg" border = "0" alt = ""> 3. Select the language version {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357327152.jpg" border = "0" alt = ""> 4. Select the keyboard type {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357391573.jpg" border = "0" alt = ""> 5. Set the network IP address, here I gave up {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357423341.jpg" border = "0" alt = ""> 6. Try to find the Linux Root "/" and select to temporarily mount to/mnt/sysimage {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357473371.jpg" border = "0" alt = ""> 7. now you have mounted the root "/" to/mnt/sysimage. after entering the system, run chroot/mnt/sysimage {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357658566.jpg" border = "0" alt = ""> 8. run the chroot/mnt/sysimage command and use the passwd command to change the administrator password. The shell login mode is called single-user mode, that is, only the administrator can log on to the system by himself, others cannot log on to the server using tty or remote logon. {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277357770003.jpg" border = "0" alt = "" width = "650"> grub plus single parameter method 1. this method is fast 2. grub cannot have password security control, or you know the password's initial grub login interface {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277358179003.jpg" border = "0" alt = ""> press the "e" key to enter the edit menu {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277358245632.jpg" border = "0" alt = ""> select the kernel line and press "E" to continue editing add single at the end of the row, pay attention to highlighted parts {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277358286641.jpg" border = "0" alt = ""> press enter to execute the modification, as shown in {
Window. Open ("http://blog.51cto.com/viewpic.php? Refimg = "+ this. SRC)
} 'Src = "http://img1.51cto.com/attachment/201006/201006241277358357837.jpg" border = "0" alt = ""> now you can press the "B" key to start the computer and enter the single-user mode like the CD boot, execute passwd to change the administrator password. now the administrator password has been modified. log on to the system and test the password!
This article from the "failed just temporarily stopped into .." blog, please be sure to keep this source http://linuxsafe.blog.51cto.com/438124/338511
