NFSv4 mount incorrectly shows all files with ownership as nobody:nobody
 
 SOLUTION VERIFIED - Updated February 18 2016 at 5:48 PM - 
Environment
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • NFSv4 share being exported from an NFSv4 capable NFS server
Issue
  • From the client, the mounted NFSv4 share has ownership for all files and directories listed as nobody:nobody instead of the actual user that owns them on the NFSv4 server, or who created the new file and directory.
  • Seeing nobody:nobody permissions on nfsv4 shares on the nfs client. Also seeing the following error in /var/log/messages:
nss_getpwnam: name 'root@example.com' does not map into domain 'localdomain' 
Resolution
  • Modify the /etc/idmapd.conf with the proper domain (FQDN), on both the client and server. In this example, the proper domain is "example.com" so the "Domain =" directive within /etc/idmapd.conf should be modified to read:
Domain = example.com
  • Note:
  • If using a NetApp Filer, the NFS.V4.ID.DOMAIN parameter must be set to match the "Domain =" parameter on the client.
  • If using a Solaris machine as the NFS server, the NFSMAPID_DOMAIN value in /etc/default/nfs must match the RHEL clients Domain.
  • To put the changes into effect restart the rpcidmapd service and remount the NFSv4 filesystem:
# service rpcidmapd restart
# mount -o remount /nfs/mnt/point
Note: It is only necessary to restart rpc.idmapd service on systems where rpc.idmapd is actually performing the id mapping. On RHEL 6.3 and newer NFS CLIENTS, the maps are stored in the kernel keyring and the id mapping itself is performed by the /sbin/nfsidmap program. On older NFS CLIENTS (RHEL 6.2 and older) as well as on all NFS SERVERS running RHEL, the id mapping is performed by rpc.idmapd.
  • Ensure the client and server have matching UID's and GID's. It is a common misconception that the UID's and GID's can differ when using NFSv4. The sole purpose of id mapping is to map an id to a name and vice-versa. ID mapping is not intended as some sort of replacement for managing id's.
  • On Red Hat Enterprise Linux 6, if the above settings have been applied and UID/GID's are matched on server and client and users are still being mapped to nobody:nobody than a clearing of the idmapd cache may be required:
 # nfsidmap -c 
Note: The above command is only necessary on systems that use the keyring-based id mapper, i.e. NFS CLIENTS running RHEL 6.3 and higher. On RHEL 6.2 and older NFS CLIENTS as well as all NFS SERVERS running RHEL, the cache should be cleared out when rpc.idmapd is restarted.
  • Another check, see if the passwd:, shadow: and group: settings are set correctly in the /etc/nsswitch.conf file on both Server and Client.
Disabling idmapping
  • By default, RHEL6.3 and newer NFS clients and servers disable idmapping when utilizing the AUTH_SYS/UNIX authentication flavor by enabling the following booleans:
NFS client 
 # echo 'Y' > /sys/module/nfs/parameters/nfs4_disable_idmapping 
 
NFS server
 # echo 'Y' > /sys/module/nfsd/parameters/nfs4_disable_idmapping 
  • If using a NetApp filer, the options nfs.v4.id.allow_numerics on command can be used to disable idmapping. More information can be foundhere.
  • With this boolean enabled, NFS clients will instead send numeric UID/GID numbers in outgoing attribute calls and NFS servers will send numeric UID/GID numbers in outgoing attribute replies.
  • If NFS clients sending numeric UID/GID values in a SETATTR call receive an NFS4ERR_BADOWNER reply from the NFS server clients will re-enable idmapping and send user@domain strings for that specific mount from that point forward.
Note: This option can only be used with AUTH_SYS/UNIX authentication flavors, if you wish to use something like Kerberos, idmapping must be used.
Root Cause
  • NFSv4 utilizes ID mapping to ensure permissions are set properly on exported shares, if the domains of the client and server do not match then the permissions are mapped to nobody:nobody.
Diagnostic Steps
  • Debugging/verbosity can be enabled by editing /etc/sysconfig/nfs:
RPCIDMAPDARGS="-vvv"
  • The following output is shown in /var/log/messages when the mount has been completed and the system shows nobody:nobody as user and group permissions on directories and files:
Jun  3 20:22:08 node1 rpc.idmapd[1874]: nss_getpwnam: name 'root@example.com' does not map into domain 'localdomain' 
Jun  3 20:25:44 node1 rpc.idmapd[1874]: nss_getpwnam: name 'root@example.com' does not map into domain 'localdomain'
  • Collect a tcpdump of the mount attempt:
# tcpdump -s0 -i {INTERFACE} host {NFS.SERVER.IP} -w /tmp/{casenumber}-$(hostname)-$(date +"%Y-%m-%d-%H-%M-%S").pcap & 
  • If a TCP packet capture has been obtained, check for a nfs.nfsstat4 packet that has returned a non-zero response equivalent to 10039 (NFSV4ERR_BADOWNER).
  • From the NFSv4 RFC:
  NFS4ERR_BADOWNER        = 10039,/* owner translation bad   */
 
  NFS4ERR_BADOWNER      An owner, owner_group, or ACL attribute value
                        can not be translated to local representation.
  • Product(s)
  • Component
  • Category
  • Tags
This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.

NFSv4 mount incorrectly shows all files with ownership as nobody:nobody的更多相关文章

  1. 10 Useful du (Disk Usage) Commands to Find Disk Usage of Files and Directories

    The Linux “du” (Disk Usage) is a standard Unix/Linux command, used to check the information of disk ...

  2. 在NAS设备上用NFS服务为RAC数据库和集群件存储oracle文件时的mount选项

    今天在家折腾自己的小实验室,把自己NAS上的一个目录用NFS挂载到一套11g RAC的实验环境中. 当我在备份数据库到NAS上时,发现一个奇怪的问题,同样的目录下,默认backup 备份集的情况,备份 ...

  3. DAY1 linux 50条命令

    1. tar压缩,解压缩 tar -cvf *** (压缩) tar -xvf ***  (解压缩) [root@bogon ~]# tar cvf test.tar test/ test/ test ...

  4. ocp 1Z0-042 1-60题解析

    1. Because of a power outage,instance failure has occurred. From what point in the redo log does rec ...

  5. linux 命令中英文对照,收集

    linux 命令中英文对照,收集   linux 命令英文全文 Is Linux CLI case-sensitive? The answer is, yes. If you try to run L ...

  6. 50个最常用的UNIX/Linux命令

    转自http://get.jobdeer.com/493.get 1. tar command examples Create a new tar archive. $ tar cvf archive ...

  7. Sharing The Application Tier File System in Oracle E-Business Suite Release 12.2

    The most current version of this document can be obtained in My Oracle Support Knowledge Document 13 ...

  8. Python库 - Albumentations 图片数据增强库

    Python图像处理库 - Albumentations,可用于深度学习中网络训练时的图片数据增强. Albumentations 图像数据增强库特点: 基于高度优化的 OpenCV 库实现图像快速数 ...

  9. openshift上使用devicemapper

    环境:openshift v3.6.173.0.5 openshift上devicemapper与官方文档中的描述略有不同,在官方文档的描述中,容器使用的lvm文件系统挂载在/var/lib/devi ...

随机推荐

  1. DDD——让天下没有难调的程序

    https://www.linuxidc.com/Linux/2016-11/137343.htm DDD全称Data Display Debugger,当我第一次见到它时,它的界面着实让我吃了一惊, ...

  2. Linux服务器中OpenSSH的源码编译与升级

                      Linux服务器中OpenSSH的源码编译与升级 https://www.oschina.net/question/12_7383    

  3. UT技巧

    (一)PowerMockito进行UT测试如何略过方法,使方法不被执行(含私有方法): PowerMockito.doNothing().when(TestMock.class,"foo1& ...

  4. 3.shell位置参数变量

    当我们执行一个shell脚本时,希望可以获取命令行里的参数信息,就可以使用位置参数变量.比如 sh ./a.sh 100 200,就是一个执行shell的命令行,可以在a.sh脚本中获取到参数信息 语 ...

  5. python--requests_html

    这个模块从名字上也能看出来,是专门用来解析html的,这个和requests的作者是同一人,非常牛逼的一位大佬. 大致读了一下源码,总共一个py文件(但是引用了其他的模块),加上注释总共才700多行, ...

  6. 层级数据模板 案例(HierarchicalDataTemplateWindow)

    1.xaml 文件 <Window x:Class="DataTemplate.HierarchicalDataTemplateWindow"        xmlns=&q ...

  7. k8s的chart学习(下)

    1.开发自己的chart Kubernetes 给我们提供了大量官方 chart,不过要部署微服务应用,还是需要开发自己的 chart,下面就来实践这个主题. 1.1创建 chart 执行 helm ...

  8. eclipse断点调试基础

    进入debug模式: 1.设置断点 2.启动servers端的debug模式 3.运行程序,在后台遇到断点时,进入debug调试状态 ============================= 作用域 ...

  9. yii2.0在model里自定义数据表

    无需多言,直接撸代码 class Zhuanjia extends \yii\db\ActiveRecord { public static function tableName() { return ...

  10. Fedora27安装宝塔linux面板出现/usr/lib/rpm/redhat/redhat-hardened-cc1找不到的错误

    执行下面的命令: sudo dnf install redhat-rpm-config 就可以解决你的问题了