What's the purpose of Linux's extrausers?

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Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?






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    Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?






    linux security nsswitch






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      Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?






      linux security nsswitch






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      Can someone explain the purpose, and benefits, of having an additional and separate 'extrausers' user repository in certain Linux systems (such as in Ubuntu Core)? Why not use the standard /etc/group,passwd,shadow db?






      linux security nsswitch




      linux security nsswitch





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