Caution

Linux 前端之家
前端之家收集整理的这篇文章主要介绍了Caution，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

<h2 class="title">http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-nfs-client-config.html
<h2 class="title">18.6. NFS Server Configuration

There are three ways to configure an NFS server under Red Hat Enterprise Linux: using the (),manually editing its configuration file (),or using the command.

To use the NFS Server Configuration Tool,you must be running X Windows,have root privileges,and have the system-config-nfs RPM package installed. To start the application,click on => => => . You can also type the command in a terminal. The NFS Server Configuration tool window is illustrated below.

NFS Server Configuration Tool

Figure 18.1. NFS Server Configuration Tool

Based on certain firewall settings,you may need to configure the NFS daemon processes to use specific networking ports. The NFS server settings allows you to specify the ports for each process instead of using the random ports assigned by the portmapper. You can set the NFS Server settings by clicking on the button. The figure below illustrates the NFS Server Settings window.

NFS Server Settings3015106.html">

Figure 18.2. NFS Server Settings

Sharing or serving files from an NFS server is known as exporting the directories. The can be used to configure a system as an NFS server.

To add an NFS share,click the button. The dialog Box shown in appears.

The tab requires the following information:

  • — Specify the directory to share,such as .

  • — Specify the host(s) with which to share the directory. Refer to for an explanation of possible formats.

  • — Specify whether the directory should have read-only or read/write permissions.

    • Add Share

    Figure 18.3. Add Share

    The tab allows the following options to be configured:

    NFS General Options

    Figure 18.4. NFS General Options

  • — Services started on port numbers less than 1024 must be started as root. Select this option to allow the NFS service to be started by a user other than root. This option corresponds to .

  • — Do not require a lock request. This option corresponds to .

  • — If a subdirectory of a file system is exported,but the entire file system is not exported,the server checks to see if the requested file is in the subdirectory exported. This check is called . Select this option to disable subtree checking. If the entire file system is exported,selecting to disable subtree checking can increase the transfer rate. This option corresponds to .

  • — Enabled by default,this option does not allow the server to reply to requests before the changes made by the request are written to the disk. This option corresponds to . If this is not selected,the option is used.

  • — Do not delay writing to disk. This option corresponds to .

  • turns the option on or off. When the option is off,nested directories are revealed. The clients can therefore navigate through a filesystem from the parent without noticing any changes.

  • sets the option which allows a directory to be exported only if it has been mounted.

  • specifies the path to an optional mount point. Click on the to navigate to the preferred mount point or type the path if known.

  • sets the option. This is mainly used in a clustered setup. Using a consistent filesystem ID in all clusters avoids having stale NFS filehandles.

    • NFS User Access

    Figure 18.5. NFS User Access

    The tab allows the following options to be configured:

  • — By default,the user and group IDs of the root user are both 0. Root squashing maps the user ID 0 and the group ID 0 to the user and group IDs of anonymous so that root on the client does not have root privileges on the NFS server. If this option is selected,root is not mapped to anonymous,and root on a client has root privileges to exported directories. Selecting this option can greatly decrease the security of the system. Do not select it unless it is absolutely necessary. This option corresponds to .

  • — If this option is selected,all user and group IDs are mapped to the anonymous user. This option corresponds to .

  • — If is selected,this option lets you specify a user ID for the anonymous user. This option corresponds to .

  • — If is selected,this option lets you specify a group ID for the anonymous user. This option corresponds to .

    • To edit an existing NFS share,select the share from the list,and click the button. To delete an existing NFS share,and click the button.

    After clicking to add,edit,or delete an NFS share from the list,the changes take place immediately — the server daemon is restarted and the old configuration file is saved as . The new configuration is written to .

    The reads and writes directly to the configuration file. Thus,the file can be modified manually after using the tool,and the tool can be used after modifying the file manually (provided the file was modified with correct Syntax).

    The next this section discusses manually editing and using the command to export NFS file systems.

    If you prefer editing configuration files using a text editor or if you do not have the X Window System installed,you can modify the configuration file directly.

    The file controls what directories the NFS server exports. Its format is as follows:

    directory hostname(options)

    The only option that needs to be specified is one of or ( is recommended). If is specified,the server does not reply to requests before the changes made by the request are written to the disk.

    For example,

         speedy.example.com(sync)

    would allow users from to mount with the default read-only permissions,but,

         speedy.example.com(rw,sync)

    would allow users from to mount with read/write privileges.

    Refer to for an explanation of possible hostname formats.

    Caution

    Be careful with spaces in the file. If there are no spaces between the hostname and the options in parentheses,the options apply only to the hostname. If there is a space between the hostname and the options,the options apply to the rest of the world. For example,examine the following lines:

    

    The first line grants users from  read-write access and denies all other users. The second line grants users from  read-only access (the default) and allows the rest of the world read-write access.
    

    

    Each time you change ,you must inform the NFS daemon of the change,or reload the configuration file with the following command:
    

    

    

    

    

    

    

    


    The host(s) can be in the following forms:
    

    

  • 

    Single machine — A fully qualified domain name (that can be resolved by the server),hostname (that can be resolved by the server),or an IP address.
    

    • 

  • 

    Series of machines specified with wildcards — Use the * or ? character to specify a string match. Wildcards are not to be used with IP addresses; however,they may accidentally work if reverse DNS lookups fail. When specifying wildcards in fully qualified domain names,dots (.) are not included in the wildcard. For example, includes one.example.com but does not include one.two.example.com.
    

    • 

  • 

    IP networks — Use a.b.c.d/z,where a.b.c.d is the network and z is the number of bits in the netmask (for example 192.168.0.0/24). Another acceptable format is a.b.c.d/netmask,where a.b.c.d is the network and netmask is the netmask (for example,192.168.100.8/255.255.255.0).
    

    • 

  • 

    Netgroups — In the format @group-name,where group-name is the NIS netgroup name.
    

    • 


    

    NFS shares are mounted on the client side using the  command. The format of the command is as follows:
    

     -o  : 

    

    Replace  with either  for NFSv2 or NFSv3 servers,or  for NFSv4 servers. Replace  with a comma separated list of options for the NFS file system (refer to  for details). Replace  with the remote host, with the remote directory being mounted,and  with the local directory where the remote file system is to be mounted.
    

    Refer to the  man page for more details.
    

    If accessing an NFS share by manually issuing the  command,the file system must be remounted manually after the system is rebooted. Red Hat Enterprise Linux offers two methods for mounting remote file systems automatically at boot time: the  file or the  service.
    

    

    

    

    

    

    

    

    An alternate way to mount an NFS share from another machine is to add a line to the  file. The line must state the hostname of the NFS server,the directory on the server being exported,and the directory on the local machine where the NFS share is to be mounted. You must be root to modify the  file.
    

    Replace  with the local file system on which the exported directory is mounted. This mount point must exist before  is read or the mount fails.
    

    Replace  with either  for NFSv2 or NFSv3 servers,or  for NFSv4 servers.
    

    Replace  with a comma separated list of options for the NFS file system (refer to  for details). Refer to the  man page for additional information.
    



      
    
      
                     
              
            
          
          
          
          
    
            
    
              
    


    
            
    
          
    

          
    
            
    
              
    
                  
    
    猜你在找的Linux相关文章
    

    
                                    
    文件查找---find
    
                                
    文件查找（find） 1 find 简单的说，就是实时查找指定的内容或条件。特点：最新、最快、最...
    
                                
                                    
                            
    

    
                                    
    非交互式添加分区
    
                                
    非交互式添加分区 方法一 添加/deb/sdb 下的分区，其实位置为1到1000M，第二个分区位置为1...
    
                                
                                    
                            
    

    
                                    
    编译安装httpd
    
                                
    编译安装httpd 1 去官网下载源码包 为避免非法软件，一定要去官网下载http://www.apache.o...
    
                                
                                    
                            
    

    
                                    
    磁盘分区-gdisk用法
    
                                
    gdisk用法 gdisk - InteractiveGUIDpartitiontable (GPT) manipulator GPTfdisk (akagdisk...
    
                                
                                    
                            
    

    
                                    
    Linux常用快捷按键
    
                                
    1 一定用快捷键 这里简单的说下几个常用的快捷按键。 1.1 移动光标快捷键 Crtl + a 光...
    
                                
                                    
                            
    

    



    
                                    
    文件的压缩与解压
    
                                
    文件的压缩与解压 常用命令和参数 1 gzip -c 将压缩或解压的结果输出至标准输出 -d 解压缩...
    
                                
                                    
                            
    

    
                                    
    合并 CentOS 6.8 的两个ISO镜像
    
                                
    合并 CentOS 6.8 的两个ISO镜像 1、创建相关目录： 说明： /mnt/dvd1和/mnt/dvd2 用于挂载...
    
                                
                                    
                            
    

    
                                    
    常用的文件查看命令
    
                                
    常用的文件查看命令 1 cat 常用参数 -n 显示行号 -E 显示行尾结束符 $ -b 显示非空行编号 ...
    
                                
                                    
                            
    

    
                                    
    挂载mount
    
                                
    mount 1 挂载mount 基本概念 挂载：将额外文件系统与根文件系统现存的目录建立起关联关系，...
    
                                
                                    
                            
    

    
                                    
    部署DNS服务
    
                                
    DNS，全称Domain Name System，即域名解析系统 。 DNS功能 主机名到IP地址的映射有两种方式...
    
                                
                                    
                            
    

    



    
            
    
          
    
        
        
        
        
        
    
          
          
    
            
    
              
    
                
                
    LinuxWindowsCentOSUbuntuNginxWebServiceScalaMemcacheApacheRedisDockerBashAzureTomcatLNMPShell数据结构服务器运维网络安全
    
                
    
              
    
            
    
          
    
          
         
          
    
            
    
              
     



              
    
            
    
          
    
          
          
          
          
    
            
    
              
    
                
                
              
    
            
    
          
    
          


          
          
    
            
    
              
    
                
                
    xebugnodemondocker-copydcoselasticsearcwindows-contdocker-windodocker-awsamazon-cloudenvoyproxyhashicorp-vaswisscomdevkafka-pythonzscalerphoton-osdocker-swarmkamongoogle-cloudconcoursewso2-ampersistent-vapi-managerprocess-manamanjarojenkins-workhypriotremoteapikeystonejsbitcoindbitcoin-test
    
              
    
            
    
          
    
          
          
          
         
          
    
            
    
              
     



              
    
            
    
          
    
          
          
          
    
        
        
    

     




    The general Syntax for the line in  is as follows:
    

    

    The mount point  must exist on the client machine before this command can be executed. After adding this line to  on the client system,type the command  at a shell prompt,and the mount point  is mounted from the server.
    

    The  file is referenced by the  service at boot time,so lines referencing NFS shares have the same effect as manually typing the  command during the boot process.
    

    A sample  line to mount an NFS export looks like the following example:
    

    :    0 0

    

    Replace  with the hostname,IP address,or fully qualified domain name of the server exporting the file system.
    

    Replace  with the path to the exported directory.