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Encoder QR Code in Software [root@serverA ~]# cp /var/yp/Makefile /var/yp/Makefileoriginal

[root@serverA ~]# cp /var/yp/Makefile /var/yp/Makefileoriginal
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The following section discusses some directives in the Makefile file that are of particular interest to us in this chapter Sections of a sample Makefile are also quoted here, along with their comments for clarity
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Designating Slave Servers: NOPUSH
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If you plan to have NIS slave servers, you ll need to tell the master NIS server to push the resulting maps to the slave servers Change the NOPUSH variable to false if you want slave servers NOTE If you don t need slave servers now but think you will need them later, you can change this option when you do add the servers
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# If we have only one server, we don't have to push the maps to the slave # servers (NOPUSH=true) If you have slave servers, change this # to "NOPUSH=false" and put all hostnames of your slave servers in the file # /var/yp/ypservers NOPUSH=true
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Remember to list the hostnames of your slave servers in the /var/yp/ypservers file And for each hostname you list there, be sure to list a corresponding entry in the /etc/ hosts file
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Minimum UIDs and GIDs: MINUID and MINGID
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When accounts are added, the minimum user ID (UID) and group ID (GID) created in the /etc/passwd and /etc/group files will be different, depending on your Linux distribution Be sure to set the minimum UID and GID values that you are willing to share via
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NIS Obviously, you don t want to share the root entry via NIS, so the minimum should never be zero
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# We do not put password entries with lower UIDs (the root and system # entries) in the NIS password database for security MINUID is the # lowest UID that will be included in the password maps If you # create shadow maps, the UserID for a shadow entry is taken from # the passwd file If no entry is found, this shadow entry is # ignored # MINGID is the lowest GID that will be included in the group maps MINUID=500 MINGID=500
Merging Shadow Passwords with Real Passwords: MERGE_PASSWD
So that NIS can be used for other systems to authenticate users, you will need to allow the encrypted password entries to be shared through NIS If you are using shadow passwords, NIS will automatically handle this for you by taking the encrypted field from the /etc/shadow file and merging it into the NIS-shared copy of /etc/passwd Unless there is a specific reason why you do not want to enable sharing of the encrypted passwords, leave the MERGE_PASSWD setting alone
# Should we merge the passwd file with the shadow file # MERGE_PASSWD=true|false MERGE_PASSWD=true
Merging Group Shadow Passwords with Real Groups: MERGE_GROUP
The /etc/group file allows passwords to be applied to group settings Since the /etc/group file needs to be publicly readable, some systems have taken to supporting shadow group files these are similar in nature to shadow password files Unless you have a shadow group file, you need to set the MERGE_GROUP setting to false
# Should we merge the group file with the gshadow file # MERGE_GROUP=true|false MERGE_GROUP=false
Designating Filenames
The following Makefile segment shows the files that are preconfigured to be shared via NIS Just because they are listed here, however, does not mean they are automatically shared This listing simply establishes variables for later use in the Makefile
YPPWDDIR = /etc
23:
Network Information Service (NIS)
This variable (YPPWDDIR) specifies the location of the passwd, group, and shadow files
YPSRCDIR = /etc
The YPSRCDIR variable is generally used to specify the directory location of the other source files for NIS It is used mostly for the network-related files, such as the hosts file, protocols, file, and services file The variable is used extensively in the rest of the file to specify the location of other files that might be of interest The listing that follows shows the actual usage of the YPPWDDIR and YPSRCDIR variables in the Makefile:
# These are the files from which the NIS databases are built You may edit # these to taste in the event that you wish to keep your NIS source files # separate from your NIS server's actual configuration files GROUP = $(YPPWDDIR)/group PASSWD = $(YPPWDDIR)/passwd SHADOW = $(YPPWDDIR)/shadow GSHADOW = $(YPPWDDIR)/gshadow <OUTPUT TRUNCATED> ALIASES = /etc/aliases HOSTS = $(YPSRCDIR)/hosts SERVICES = $(YPSRCDIR)/services AUTO_MASTER = $(YPSRCDIR)/automaster AUTO_HOME = $(YPSRCDIR)/autohome AUTO_LOCAL = $(YPSRCDIR)/autolocal TIMEZONE = $(YPSRCDIR)/timezone
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