NFS shared services

One 、YUM summary

1、YUM (Yellow dog Updater Modified)

be based on RPM Software update mechanism of package building
Can automatically resolve dependencies
All software packages are centralized YUM Provided by software warehouse

2、 Ready to install source

（1） How to provide software warehouse
Network source
FTP service : ftp://…
HTTP service : http://…
Local sources
Local directory : file://…

（2）RPM The source of the package
CentOS released RPM Bag collection
Issued by a third party organization RPM Bag collection
User defined RPM Bag collection

（3） structure CentOS 7 repositories
RPM The bag comes from CentOS 7 DVD Compact disc
adopt FTP Mode is provided to the client ( Install and enable vsftpd service )

（4） Add unofficial to the software warehouse RPM Package group
Generally obtained through network
Include all other dependencies RPM package
Need to use createrepo Tool building repodata Data file warehouse
The installation package files are stored in /var/ftp/other Under the table of contents

3、 visit YUM Warehouse

Specify... For the client YUM Warehouse location
Profile location : /etc/yum.repos.d/centos7.repo

Two 、NFS Shared storage services

1、 Relevant concepts

NFS It's based on TCP/IP Transport network file system protocol . By using NFS agreement , The client can access the shared resources in the remote server just like accessing the local directory .
For most load balanced clusters , Use NFS Protocol to share data storage is a common practice ,NFS It's also NAS A protocol that storage devices must support . But because of NFS There is no user authentication mechanism , And the data is transmitted in plain text over the network , So the security is very poor , Generally, it can only be used in LAN .
NFS The implementation of a service depends on RPC（Remote Process Call, Remote procedure call ） Mechanism , Mapping to the local process , So you need to install nfs-utils、rpcbind Software package to provide NFS Shared services .
nfs-utils be used for NFS Share publishing and access

2、NFS The configuration file for the service

3、 ... and 、NFS Service configuration details

1、 Use... In a file server NFS Publish shared resources

2、 Access from the client NFS Shared resources