在RHEL7中挂载cifs共享失败,并显示以下错误：“mount：无法解析挂载选项：数值结果超出范围”
# LIBMOUNT_DEBUG=0xffff mount //fileserver/db-MysqL /mnt/MysqLBackups -t cifs -o credentials=/etc/samba/fileserver.password,forceuid,uid=MysqL,forcegid,gid=MysqL,file_mode=0664,dir_mode=0775 -v 5561: libmount: INIT: library debug mask: 0xffff 5561: libmount: INIT: library version: 2.23.0 5561: libmount: INIT: feature: selinux 5561: libmount: INIT: feature: debug 5561: libmount: INIT: feature: assert 5561: libmount: CXT: [0x7ff506842050]: ----> allocate 5561: libmount: UTILS: mtab: /etc/mtab 5561: libmount: UTILS: /etc/mtab: irregular/non-writable 5561: libmount: UTILS: utab: /run/mount/utab 5561: libmount: CXT: [0x7ff506842050]: enabling flag 0010 5561: libmount: CXT: [0x7ff506842050]: mount: preparing 5561: libmount: CXT: [0x7ff506842050]: use default optmode 5561: libmount: CXT: [0x7ff506842050]: OPTSMODE: ignore=0,append=0,prepend=1,replace=0,force=0,fstab=1,mtab=1 5561: libmount: CXT: [0x7ff506842050]: fstab not required -- skip 5561: libmount: CXT: [0x7ff506842050]: merging mount flags 5561: libmount: CXT: [0x7ff506842050]: final flags: VFS=00000000 user=00000000 5561: libmount: CXT: [0x7ff506842050]: mount: evaluating permissions 5561: libmount: CXT: [0x7ff506842050]: mount: fixing optstr 5561: libmount: CXT: [0x7ff506842050]: mount: fixing vfs optstr 5561: libmount: CXT: applying 0x00000000 flags to '(null)' 5561: libmount: CXT: new optstr 'rw' 5561: libmount: CXT: [0x7ff506842050]: mount: fixing user optstr 5561: libmount: CXT: applying 0x00000000 flags to '(null)' 5561: libmount: CXT: new optstr '(null)' 5561: libmount: CXT: fixing uid 5561: libmount: CXT: fixing gid 5561: libmount: UTILS: cannot convert 'MysqL' groupname to GID 5561: libmount: CXT: [0x7ff506842050]: fixed options [rc=-34]: vfs: 'rw' fs: 'credentials=/etc/samba/fileserver.password,uid=27,dir_mode=0775' user: '(null)',optstr: 'credentials=/etc/samba/fileserver.password,dir_mode=0775' 5561: libmount: CXT: [0x7ff506842050]: mount: preparing Failed mount: Failed to parse mount options: Numerical result out of range 5561: libmount: CXT: [0x7ff506842050]: <---- reset [status=0] ----> 5561: libmount: CXT: [0x7ff506842050]: tabfiler disabled 5561: libmount: CXT: [0x7ff506842050]: <---- free
MysqL组存在：
# getent group MysqL MysqL:x:27: # grep MysqL /etc/group MysqL:x:27: # id MysqL uid=27(MysqL) gid=27(MysqL) groups=27(MysqL) # ls -lZ /etc/group /etc/passwd -rw-r--r--. root root system_u:object_r:passwd_file_t:s0 /etc/group -rw-r--r--. root root system_u:object_r:passwd_file_t:s0 /etc/passwd
如果发现有趣的是直接使用mount.cifs它正在工作：
# mount.cifs //fileserver/db-MysqL /mnt/MysqLBackups --verbose -o credentials=/etc/samba/fileserver.password,dir_mode=0775 Credential formatted incorrectly: (null) domain=fileserver mount.cifs kernel mount options: ip=10.1.2.20,unc=\\fileserver\db-MysqL,dir_mode=0775,gid=27,user=svc_linux,domain=fileserver,pass=******** # grep /mnt/MysqLBackups /proc/mounts //fileserver/db-MysqL /mnt/MysqLBackups cifs rw,relatime,vers=1.0,cache=strict,username=svc_linux,addr=10.1.2.20,nounix,serverino,rsize=61440,wsize=65536,actimeo=1 0 0
它发生在：
# uname -rvpio 3.10.0-327.36.1.el7.x86_64 #1 SMP Sun Sep 18 13:04:29 UTC 2016 x86_64 x86_64 GNU/Linux
同样的问题：
# uname -rvpio 3.10.0-327.36.3.el7.x86_64 #1 SMP Mon Oct 24 16:09:20 UTC 2016 x86_64 x86_64 GNU/Linux
mount和mount.cifs是RHEL7的最新版本：
# rpm -q util-linux cifs-utils util-linux-2.23.2-26.el7_2.3.x86_64 cifs-utils-6.2-7.el7.x86_64
似乎getgrnam_r(3)调用失败了.
编辑1：
我想使用用户名和组名而不是UID GID.我知道使用数字ID我可以解决问题.我知道删除gid = MysqL它会起作用.为什么用户mount能够找到UID,但是对于grup,它无法找到GID？
编辑2：
这段代码似乎抛出了这个错误：
https://github.com/karelzak/util-linux/blob/master/libmount/src/utils.c#L703
所以我尝试使用以下代码重现,但调用成功.这对我来说很奇怪.对不起邋C的C代码,我不是程序员.
#include <stdio.h> #include <errno.h> #include <stdlib.h> #include <sys/types.h> #include <grp.h> #define UL_GETPW_BUFSIZ (16 * 1024) int main(void) { int rc = -1; struct group grp; struct group *gr; char *buf; int _gid=10; gid_t *gid = (gid_t *)& _gid; char *groupname = "MysqL"; if (!groupname || !gid) return -EINVAL; buf = malloc(UL_GETPW_BUFSIZ); if (!buf) return -ENOMEM; if (!getgrnam_r(groupname,&grp,buf,UL_GETPW_BUFSIZ,&gr) && gr) { *gid= gr->gr_gid; printf("gid=%i\n",*gid); rc = 0; } else { printf("cannot convert '%s' groupname to GID\n",groupname); rc = errno ? -errno : -EINVAL; } free(buf); return rc; } // vim:ts=4:sts=4:sw=4:et:
没有报告错误：
# gcc -Wall -W test.c # ./a.out gid=27 #
编辑3：
如果我尝试gid = dbus它正在工作：
# egrep 'MysqL|dbus' /etc/passwd /etc/shadow /etc/group /etc/gshadow /etc/passwd:dbus:x:81:81:System message bus:/:/sbin/nologin /etc/passwd:MysqL:x:27:27:Percona Server:/var/lib/MysqL:/bin/false /etc/shadow:dbus:!!:17086:::::: /etc/shadow:MysqL:!!:17104:::::: /etc/group:dbus:x:81: /etc/group:MysqL:x:27: /etc/gshadow:dbus:!:: /etc/gshadow:MysqL:!:: # LIBMOUNT_DEBUG=0xffff mount //fileserver/db-MysqL /mnt/MysqLBackups -t cifs -o credentials=/etc/samba/fileserver.password,gid=dbsu 10777: libmount: INIT: library debug mask: 0xffff 10777: libmount: INIT: library version: 2.23.0 10777: libmount: INIT: feature: selinux 10777: libmount: INIT: feature: debug 10777: libmount: INIT: feature: assert 10777: libmount: CXT: [0x7f687bf74050]: ----> allocate 10777: libmount: UTILS: mtab: /etc/mtab 10777: libmount: UTILS: /etc/mtab: irregular/non-writable 10777: libmount: UTILS: utab: /run/mount/utab 10777: libmount: CXT: [0x7f687bf74050]: mount: preparing 10777: libmount: CXT: [0x7f687bf74050]: use default optmode 10777: libmount: CXT: [0x7f687bf74050]: OPTSMODE: ignore=0,mtab=1 10777: libmount: CXT: [0x7f687bf74050]: fstab not required -- skip 10777: libmount: CXT: [0x7f687bf74050]: merging mount flags 10777: libmount: CXT: [0x7f687bf74050]: final flags: VFS=00000000 user=00000000 10777: libmount: CXT: [0x7f687bf74050]: mount: evaluating permissions 10777: libmount: CXT: [0x7f687bf74050]: mount: fixing optstr 10777: libmount: CXT: [0x7f687bf74050]: mount: fixing vfs optstr 10777: libmount: CXT: applying 0x00000000 flags to '(null)' 10777: libmount: CXT: new optstr 'rw' 10777: libmount: CXT: [0x7f687bf74050]: mount: fixing user optstr 10777: libmount: CXT: applying 0x00000000 flags to '(null)' 10777: libmount: CXT: new optstr '(null)' 10777: libmount: CXT: fixing uid 10777: libmount: CXT: fixing gid 10777: libmount: UTILS: cannot convert 'dbsu' groupname to GID 10777: libmount: CXT: [0x7f687bf74050]: fixed options [rc=-34]: vfs: 'rw' fs: 'credentials=/etc/samba/fileserver.password,gid=dbsu' user: '(null)',gid=dbsu' 10777: libmount: CXT: [0x7f687bf74050]: mount: preparing Failed mount: Failed to parse mount options: Numerical result out of range 10777: libmount: CXT: [0x7f687bf74050]: <---- reset [status=0] ----> 10777: libmount: CXT: [0x7f687bf74050]: tabfiler disabled 10777: libmount: CXT: [0x7f687bf74050]: <---- free
解决方法
启用CIFS的系统无法将组名MysqL映射到GID 27,而是尝试将MysqL解析为数字GID值.这显然会超出范围,因为它是一个字符串而不是一个int.到目前为止,我还不清楚这是否是主机或客户端的失败.
如果化妆品组和用户名MysqL和附带的ID不在两台服务器上,则通过groupmod命令或编辑/ etc / group文件进行修复.如果所需的GID和UID在两台主机上相同,或者是固定的默认值(如MysqL,27为),则按编号指定GUID和UID,而不是按名称指定.这有点像kludge,但它可能会奏效.
有必要进一步调查为什么它没有将名称映射到ID的编号.自mount.cifs 1.10以来,我们已经能够使用装饰用户名和组名.再说一次,如果你没有在这个卷的平常挂载过程中调用mount.cifs帮助器,你可能永远不能使用化妆品名称,除非它在你正在使用的任何帮助器中显式实现.
