You are in charge of a domain. Your developers have asked that mirrors of certain sites be placed as actual directories off the default path. Specifically they have asked that the ftp.example-debian.org Debian tree should be mapped at /usr/local. Assume that ftp.example-debian.org does an NFS export of their site. What would be the correct entry in the /etc/auto.master file?
A. /usr/local/debian ro ftp.example-debian.org:/pub/debian
B. /usr/local/debian /etc/auto.debian with /etc/auto.debian containing debian-ro,soft,intr:ftp.example-debian.org:/pub/debian
C. /usr/local/debian :etc/auto.debian with /etc/auto.debian containing debian:rw,soft,intr:ftp.example-debian::/pub/debian
D. /etc/auto.debian with /etc/auto.debian containing debian-ro,soft,intr:ftp.example-debian.org:/pub/debian
E. /etc/auto.debian with /etc/auto.debian containing debian:rw,soft,intr:ftp.example-debian.org::/pub/debian
Correct Answer: B
Explanation/Reference:
Explanation: Autofs uses the automount daemon to manage your mount points by only mounting them dynamically when they are accessed. Autofs consults the master map configuration file /etc/auto.master to determine which mount points are defined. It then starts an automount process with the appropriate parameters for each mount point. Each line in the master map defines a mount point and a separate map file that defines the filesystems to be mounted under this mount point.
In this question, the /etc/auto.master file would contain the line “/usr/local/debian /etc/auto.debian”. /usr/local/debian is the mount point on the local machine. /etc/auto.debian is the name of the map file that defines what should be mounted at the mount point.
The /etc/auto.debian file should contain “debian-ro,soft,intr:ftp.example-debian.org:/pub/debian”. This contains the mount point (debian), followed by some mount options (ro,soft,intr) followed by the directory to be mounted in the form of hostname:directory (ftp.example-debian.org:/pub/debian).
Reference: http://www.redhat.com/docs/manuals/linux/RHL-7.3-Manual/custom-guide/s1-nfs-mount.html
Incorrect Answers
A:There is no map file defined in this line.
C:The syntax is wrong. usr/local/debian :etc/auto.debian should be /usr/local/debian /etc/auto.debian.
D:There is no mount point (usr/local/debian) defined in this answer.
E:There is no mount point (usr/local/debian) defined in this answer.
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