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CentOS 6 + LDAP + NFS。文件所有权被卡在“nobody”上

tag-icon • tag-icon centos nfs openldap sssd
CentOS 6 + LDAP + NFS。文件所有权被卡在“nobody”上

几天来，我一直在尝试在 CentOS 6 上实现 LDAP 身份验证和 NFS 导出主目录。现在，我可以使用 LDAP 中的用户名和密码登录到客户端计算机。在客户端上，/home 和 /opt 通过 NFS 安装在 fstab 中。但是，/opt 和 /home 中的每个文件都归nobody:nobody客户端上的 (uid: 99, gid: 99) 所有。

但是我的 uid 和 gid 似乎设置正确：

-bash-4.1$ id
uid=3000(myusername) gid=3000(employees) groups=3000(employees)

我还能检查什么？以下是我客户端上的一些配置文件：

/etc/nsswitch.conf

passwd:     files sss
shadow:     files sss
group:      files sss

hosts:      files dns

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   files sss

publickey:  nisplus

automount:  files ldap
aliases:    files nisplus

/etc/sssd/sssd.conf

[sssd]
config_file_version = 2
services = nss, pam

domains = default
[nss]

[pam]


[domain/default]
auth_provider = ldap
ldap_id_use_start_tls = True
chpass_provider = ldap
cache_credentials = True
krb5_realm = EXAMPLE.COM
ldap_search_base = dc=mycompany,dc=com
id_provider = ldap
ldap_uri = ldaps://server.subdomain.mycompany.com
krb5_kdcip = kerberos.example.com
ldap_tls_cacertdir = /etc/openldap/cacerts

# Configure client certificate auth.
ldap_tls_cert = /etc/openldap/cacerts/client.pem
ldap_tls_key = /etc/openldap/cacerts/client.pem
ldap_tls_reqcert = demand

/etc/fstab

/dev/mapper/vg_main-lv_root /                       ext4    defaults        1 1
UUID=4e43a15d-4dc0-4836-8fa6-c3445fde756c /boot                   ext4    defaults        1 2
/dev/mapper/vg_main-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
storage1:/nas/home  /home  nfs   soft,intr,rsize=8192,wsize=8192
storage1:/nas/opt  /opt  nfs   soft,intr,rsize=8192,wsize=8192

authconfig 输出：

[root@test1 ~]# authconfig --test
caching is disabled
nss_files is always enabled
nss_compat is disabled
nss_db is disabled
nss_hesiod is disabled
 hesiod LHS = ""
 hesiod RHS = ""
nss_ldap is enabled
 LDAP+TLS is enabled
 LDAP server = "ldaps://server.subdomain.mycompany.com"
 LDAP base DN = "dc=mycompany,dc=com"
nss_nis is disabled
 NIS server = ""
 NIS domain = ""
nss_nisplus is disabled
nss_winbind is disabled
 SMB workgroup = ""
 SMB servers = ""
 SMB security = "user"
 SMB realm = ""
 Winbind template shell = "/bin/false"
 SMB idmap uid = "16777216-33554431"
 SMB idmap gid = "16777216-33554431"
nss_sss is disabled by default
nss_wins is disabled
nss_mdns4_minimal is disabled
DNS preference over NSS or WINS is disabled
pam_unix is always enabled
 shadow passwords are enabled
 password hashing algorithm is sha512
pam_krb5 is disabled
 krb5 realm = "EXAMPLE.COM"
 krb5 realm via dns is disabled
 krb5 kdc = "kerberos.example.com"
 krb5 kdc via dns is disabled
 krb5 admin server = "kerberos.example.com"
pam_ldap is enabled
 LDAP+TLS is enabled
 LDAP server = "ldaps://server.subdomain.mycompany.com"
 LDAP base DN = "dc=mycompany,dc=com"
 LDAP schema = "rfc2307"
pam_pkcs11 is disabled
 use only smartcard for login is disabled
 smartcard module = ""
 smartcard removal action = ""
pam_fprintd is enabled
pam_winbind is disabled
 SMB workgroup = ""
 SMB servers = ""
 SMB security = "user"
 SMB realm = ""
pam_sss is disabled by default
 credential caching in SSSD is enabled
 SSSD use instead of legacy services if possible is enabled
pam_cracklib is enabled (try_first_pass retry=3 type=)
pam_passwdqc is disabled ()
pam_access is disabled ()
pam_mkhomedir or pam_oddjob_mkhomedir is enabled ()
Always authorize local users is enabled ()
Authenticate system accounts against network services is disabled

答案1

需要为 Google 搜索者添加一条注释 - 我们遇到了同样的问题，无论我们做什么，nfs 挂载都无法正确映射用户 ID。

问题在于 idmapd 从错误配置中缓存了错误的 id，并且无法修复配置来解决这个问题。

centos 上修复此问题的命令是 nfsidmap -c（清除缓存）。

希望这可以帮助一些绝望的搜索者。

答案2

解决了！

/var/log/messages当我尝试挂载来自远程客户端的导出时，我偶然注意到 NFS 服务器上的这一行：

Feb 28 15:54:02 storage1 rpc.idmapd[1651]: nss_getpwnam: name 'nobody' does not map into domain 'localdomain'

这让我看了前几行/etc/idmapd.conf：

[General]
#Verbosity = 0
# The following should be set to the local NFSv4 domain name
# The default is the host's DNS domain name.
#Domain = local.domain.edu

然后我Domain=subdomain.mycompany.com在注释掉的“域”行下添加了内容。保存，退出，然后/etc/init.d/rpcidmapd restart运行/etc/init.d/nfs restart。

答案3

您的 NFS 服务器是否运行 Centos/RHEL 5？

如果是，则它正在导出 NFSv3。NFSv4 现在是 Centos6（以及最近的 Ubuntu 变体）的默认设置。

快速解决方法是在 /etc/fstab 中的挂载选项中添加“vers=3”。

例如

//10.0.0.1:/home /home nfs 默认值，vers=3，rw，noatime 0 0

答案4

所有映射到“nobody”的东西听起来都像是打开了 all_squash。

看一眼：

http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-nfs-server-config-exports.html

并验证 NFS 服务器的 /etc/exports 文件不会无意中压缩 UID。“no_all_squash” 应该是默认值，但您可以尝试明确设置它并查看会发生什么。

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