FAQ:How do I set or change the root password

2022-02-18T17:08:51Z

Niall Parker: Include note and example for escaping the $ characters to preserve pwd hash in generated files.

'''Q:''' How do I set / change the root password?

'''A:''' Use the extrausers class to set the password. In your image recipe:

inherit extrausers
EXTRA_USERS_PARAMS = "usermod -p '\$5\$sIhB3FmJb4oSx.uN\$WWE8AJP8ybR03TXBJ2JMZJ6LpsrvcwKmsHxxY.asDR6' root;"

This sets the root password to a hashed value of "1876*18". If you prefer to do this in local.conf or your distro configuration, you'll need to change the first line to <code>INHERIT += "extrausers"</code>.

To obtain the hashed value for a password, you can use the following command:

$ python -c 'import crypt; print(crypt.crypt("1876*18", crypt.METHOD_SHA256))'

{| style="color:black; background-color:#ffcccc" width="100%" cellpadding="10" class="wikitable"
|'''WARNING:''' if you are hardcoding a root password for a production image deployed to multiple devices, consider carefully the ramifications of doing so before proceeding.
|}

Note some characters may need some level of escaping to make it correctly into <code>/etc/shadow</code> (examples shown should work)

'''Q:''' How do I add users?

'''A:''' Use the extrausers class to and the user and set the password. In your image recipe:

inherit extrausers
EXTRA_USERS_PARAMS = "useradd -p '\$5\$vn9du4U3jghFZaqC\$Fl6pQZK5FUoT2D6Twij3OpjGR9FXFsE1r/vyMtGooX6' myUser;"

This adds the user myUser and sets the password to a hashed value of "2015*08". As above, if you prefer to do this in local.conf or your distro configuration, you'll need to change the first line to <code>INHERIT += "extrausers"</code>.

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FAQ:How do I set or change the root password