我有一个新的Centos 7安装。我似乎无法从Centos客户端自动挂载位于192.168.254.105:/srv/nfsshare上的NFS共享。
但是，手动挂载共享可以完美地工作。

/etc/auto.master已完全注解掉以简化问题，保存以下行：

/-       /etc/auto.nfsshare

字符串

/etc/auto.nfsshare包含以下行：

/tests/nfsshare       -fstype=nfs,credentials=/etc/credentials.txt    192.168.254.105:/srv/nfsshare

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/etc/credentials.txt包含：

user=user
 password=password

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预期的行为是，当我ls -l /tests/nfsshare时，我将看到我的文件服务器的**/srv/nfsshare**目录中保存的一些文件。
它没有。相反，它什么也没有显示。

sudo journalctl --unit=autofs.service中的日志在启动时（启用调试）显示：

Nov 20 00:25:38 localhost.localdomain systemd[1]: Starting Automounts filesystems on demand...
 Nov 20 00:25:38 localhost.localdomain automount[21204]: Starting automounter version 5.0.7-48.el7, master map auto.master
 Nov 20 00:25:38 localhost.localdomain automount[21204]: using kernel protocol version 5.02
 Nov 20 00:25:38 localhost.localdomain automount[21204]: lookup_nss_read_master: reading master files auto.master
 Nov 20 00:25:38 localhost.localdomain automount[21204]: parse_init: parse(sun): init gathered global options: (null)
 Nov 20 00:25:38 localhost.localdomain automount[21204]: spawn_mount: mtab link detected, passing -n to mount
 Nov 20 00:25:38 localhost.localdomain automount[21204]: spawn_umount: mtab link detected, passing -n to mount
 Nov 20 00:25:38 localhost.localdomain automount[21204]: lookup_read_master: lookup(file): read entry /-
 Nov 20 00:25:38 localhost.localdomain automount[21204]: master_do_mount: mounting /-
 Nov 20 00:25:38 localhost.localdomain automount[21204]: automount_path_to_fifo: fifo name /run/autofs.fifo--
 Nov 20 00:25:38 localhost.localdomain automount[21204]: lookup_nss_read_map: reading map file /etc/auto.nfsshare
 Nov 20 00:25:38 localhost.localdomain automount[21204]: parse_init: parse(sun): init gathered global options: (null)
 Nov 20 00:25:38 localhost.localdomain automount[21204]: spawn_mount: mtab link detected, passing -n to mount
 Nov 20 00:25:38 localhost.localdomain automount[21204]: spawn_umount: mtab link detected, passing -n to mount
 Nov 20 00:25:38 localhost.localdomain automount[21204]: mounted direct on /tests/nfsshare with timeout 300, freq 75 seconds
 Nov 20 00:25:38 localhost.localdomain automount[21204]: do_mount_autofs_direct: mounted trigger /tests/nfsshare
 Nov 20 00:25:38 localhost.localdomain automount[21204]: st_ready: st_ready(): state = 0 path /-
 Nov 20 00:25:38 localhost.localdomain systemd[1]: Started Automounts filesystems on demand.

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当我尝试通过ls -l /tests/nfsshare强制挂载nfs共享时，日志中出现以下内容：

Nov 20 00:48:05 localhost.localdomain automount[22030]: handle_packet: type = 5
 Nov 20 00:48:05 localhost.localdomain automount[22030]: handle_packet_missing_direct: token 21, name /tests/nfsshare, request pid 22057
 Nov 20 00:48:05 localhost.localdomain automount[22030]: attempting to mount entry /tests/nfsshare
 Nov 20 00:48:05 localhost.localdomain automount[22030]: lookup_mount: lookup(file): looking up /tests/nfsshare
 Nov 20 00:48:05 localhost.localdomain automount[22030]: lookup_mount: lookup(file): /tests/nfsshare -> -fstype=nfs,credentials=/etc/credenti...fsshare
 Nov 20 00:48:05 localhost.localdomain automount[22030]: parse_mount: parse(sun): expanded entry: -fstype=nfs,credentials=/etc/credentials.tx...fsshare
 Nov 20 00:48:05 localhost.localdomain automount[22030]: parse_mount: parse(sun): gathered options: fstype=nfs,credentials=/etc/credentials.txt  
 Nov 20 00:48:05 localhost.localdomain automount[22030]: [90B blob data]
 Nov 20 00:48:05 localhost.localdomain automount[22030]: dev_ioctl_send_fail: token = 21
 Nov 20 00:48:05 localhost.localdomain automount[22030]: failed to mount /tests/nfsshare
 Nov 20 00:48:05 localhost.localdomain automount[22030]: handle_packet:      type = 5
 Nov 20 00:48:05 localhost.localdomain automount[22030]: handle_packet_missing_direct: token 22, name /tests/nfsshare, request pid 22057
 Nov 20 00:48:05 localhost.localdomain automount[22030]: dev_ioctl_send_fail: token = 22

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此外，ls -l /tests/nfsshare实际上会产生以下错误：

ls: cannot access nfsshare/: No such file or directory

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如何解决此问题？如前所述，手动安装共享工作正常。