To reset the root password for CentOS 6:<\/p>\n
Boot Computer and Interrupt while booting at GRUB stage hitting \u2018arrow\u2018 keys or \u201cspace bar\u201c.
\nType \u2018a\u2018 to modify kernel argument. Anytime you can cancel typing \u2018ESC\u2018 key.
\nAppend 1 at the end of \u201crhgb quiet\u201d and press \u201cEnter\u201d key to boot into single user mode.
\nType command \u201crunlevel\u201d to know the the runlevel where you are standing. Here \u201c1 S\u201d state that your are in a single user mode.
\nType \u2018passwd\u2018 command without username and press \u2018Enter\u2018 key in command prompt. It\u2019ll ask to supply new root password and re-type the same password for confirmation.<\/p>\n
Reboot<\/p>\n
\n# shutdown -r now\n<\/pre>\nCentOS 7<\/p>\n
At the boot menu, press e to edit the existing kernel (Core) <\/p>\n
Next, scroll down to the list until you see the line underlined below ( ro ) . What we need to do is change that ro to rw and start into a bash shell. It should look like this rw init=\/sysroot\/bin\/sh.<\/p>\n
Change the ro line to rw and add init=\/sysroot\/bin\/sh<\/p>\n
After changing that, press Control + X or Ctrl + X on your keyboard to start into single user mode using the bash shell specified above. In this mode, we\u2019re going to change the root password.<\/p>\n
In the single user mode, run the command as shown below<\/p>\n
\n\n# chroot \/sysroot\n\n<\/pre>\nFinally, run the commands below to change the root password.<\/p>\n
\n\n# passwd root\n\n<\/pre>\nYou\u2019ll be prompted to create and confirm a new password. After creating the password, run the commands below to update SELinux parameters<\/p>\n
touch \/.autorelabel<\/p>\n
Reboot<\/p>\n","protected":false},"excerpt":{"rendered":"
To reset the root password for CentOS 6: Boot Computer and Interrupt while booting at GRUB stage hitting \u2018arrow\u2018 keys or \u201cspace bar\u201c. Type \u2018a\u2018 to modify kernel argument. Anytime you can cancel typing \u2018ESC\u2018 key. Append 1 at the end of \u201crhgb quiet\u201d and press \u201cEnter\u201d key to boot into single user mode. Type … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,11,12],"tags":[],"class_list":["post-2888","post","type-post","status-publish","format-standard","hentry","category-administration","category-centos6","category-centos-7"],"_links":{"self":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts\/2888","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/comments?post=2888"}],"version-history":[{"count":0,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts\/2888\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/media?parent=2888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/categories?post=2888"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/tags?post=2888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}