由于在Linux板子之间实现NFS文件系统挂载实现较为困难，所以改为sshfs文件系统挂载，下面一步步探索sshfs挂载的流程和实验。首先在2个虚拟机Linux系统之间测试sshfs相互挂载，然后使用buildroot编译sshfs下载到Linux板子中测试。

ubuntu 18.04

查看IP地址

logread@logread:~$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.201.132  netmask 255.255.255.0  broadcast 192.168.201.255inet6 fe80::20c:29ff:fe38:3f29  prefixlen 64  scopeid 0x20<link>ether 00:0c:29:38:3f:29  txqueuelen 1000  (Ethernet)RX packets 7256  bytes 9496942 (9.4 MB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 1688  bytes 170434 (170.4 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

安装sshfs软件

logread@logread:~$ sudo apt-get install fuse-sshfs
[sudo] password for logread:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package fuse-sshfs
logread@logread:~$ sudo apt-get install sshfs
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:sshfs
0 upgraded, 1 newly installed, 0 to remove and 64 not upgraded.
Need to get 41.3 kB of archives.
After this operation, 114 kB of additional disk space will be used.
Get:1 https://mirrors.aliyun.com/ubuntu bionic/universe amd64 sshfs amd64 2.8-1 [41.3 kB]
Fetched 41.3 kB in 0s (102 kB/s)
Selecting previously unselected package sshfs.
(Reading database ... 120266 files and directories currently installed.)
Preparing to unpack .../archives/sshfs_2.8-1_amd64.deb ...
Unpacking sshfs (2.8-1) ...
Setting up sshfs (2.8-1) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
logread@logread:~$

查看sshfs版本

logread@logread:~$ sshfs --version
SSHFS version 2.8
FUSE library version: 2.9.7
fusermount version: 2.9.7
using FUSE kernel interface version 7.19

查看支持的sshfs文件系统

logread@logread:~$ cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   ramfs
nodev   bdev
nodev   proc
nodev   cpuset
nodev   cgroup
nodev   cgroup2
nodev   tmpfs
nodev   devtmpfs
nodev   configfs
nodev   debugfs
nodev   tracefs
nodev   securityfs
nodev   sockfs
nodev   dax
nodev   bpf
nodev   pipefs
nodev   hugetlbfs
nodev   devptsext3ext2ext4squashfsvfat
nodev   ecryptfsfuseblk
nodev   fuse
nodev   fusectl
nodev   pstore
nodev   mqueuebtrfs
nodev   autofs

CentOS 7.3

查看IP地址

[yubo.wang@localhost ~]$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.201.130  netmask 255.255.255.0  broadcast 192.168.201.255inet6 fe80::890e:5af4:e734:af0d  prefixlen 64  scopeid 0x20<link>ether 00:0c:29:33:16:9e  txqueuelen 1000  (Ethernet)RX packets 15717  bytes 21012818 (20.0 MiB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 4633  bytes 442424 (432.0 KiB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

安装sshfs软件

[yubo.wang@localhost ~]$ sudo yum install fuse-sshfs
[sudo] password for yubo.wang:
Loaded plugins: auto-update-debuginfo, fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
base                                                        | 3.6 kB  00:00:00
base-debuginfo                                              | 2.5 kB  00:00:00
epel/x86_64/metalink                                        | 9.4 kB  00:00:00
epel                                                        | 4.7 kB  00:00:00
epel-debuginfo/x86_64/metalink                              | 9.3 kB  00:00:00
epel-debuginfo                                              | 3.0 kB  00:00:00
extras                                                      | 2.9 kB  00:00:00
updates                                                     | 2.9 kB  00:00:00
(1/7): epel/x86_64/group_gz                                 |  95 kB  00:00:00
(2/7): epel/x86_64/updateinfo                               | 1.0 MB  00:00:00
(3/7): extras/7/x86_64/primary_db                           | 165 kB  00:00:00
(4/7): epel/x86_64/primary_db                               | 6.8 MB  00:00:00
(5/7): epel-debuginfo/x86_64/primary_db                     | 803 kB  00:00:00
(6/7): updates/7/x86_64/primary_db                          | 7.6 MB  00:00:01
(7/7): base-debuginfo/x86_64/primary_db                     | 2.8 MB  00:06:33
Determining fastest mirrors* base: mirrors.aliyun.com* epel: mirrors.aliyun.com* epel-debuginfo: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package fuse-sshfs.x86_64 0:2.10-1.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved===================================================================================Package              Arch             Version                Repository      Size
===================================================================================
Installing:fuse-sshfs           x86_64           2.10-1.el7             epel            50 kTransaction Summary
===================================================================================
Install  1 PackageTotal download size: 50 k
Installed size: 103 k
Is this ok [y/d/N]: y
Downloading packages:
fuse-sshfs-2.10-1.el7.x86_64.rpm                            |  50 kB  00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : fuse-sshfs-2.10-1.el7.x86_64                                    1/1 Verifying  : fuse-sshfs-2.10-1.el7.x86_64                                    1/1 Installed:fuse-sshfs.x86_64 0:2.10-1.el7                                                   Complete![yubo.wang@localhost ~]$ sshfs --version
SSHFS version 2.10
FUSE library version: 2.9.2
fusermount version: 2.9.2
using FUSE kernel interface version 7.19

查看支持的文件系统

[yubo.wang@localhost ~]$ cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   ramfs
nodev   bdev
nodev   proc
nodev   cgroup
nodev   cpuset
nodev   tmpfs
nodev   devtmpfs
nodev   debugfs
nodev   securityfs
nodev   sockfs
nodev   pipefs
nodev   anon_inodefs
nodev   configfs
nodev   devpts
nodev   hugetlbfs
nodev   autofs
nodev   pstore
nodev   mqueue
nodev   selinuxfsxfs
nodev   rpc_pipefs
nodev   nfsdfuseblk
nodev   fuse
nodev   fusectl

ubuntu挂载centos

logread@logread:~$ sshfs root@192.168.201.130:/home/yubo.wang/sshfs-dir /home/logread/sshfs-dir
The authenticity of host '192.168.201.130 (192.168.201.130)' can't be established.
ECDSA key fingerprint is SHA256:cvXKQ2H2nAm+jgN8FjygG/BbubibbHxZridZwoh+FTU.
Are you sure you want to continue connecting (yes/no)? yes
root@192.168.201.130's password:
logread@logread:~$

挂载查询

sshfs (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)root@192.168.201.130:/home/yubo.wang/sshfs-dir  116G   99G   18G  85% /home/logread/sshfs-dirsudo umount /home/logread/sshfs-dir

挂载成功，写文件成功

centos挂载ubuntu

挂载测试

[yubo.wang@localhost ~]$ sshfs root@192.168.201.132:/home/logread/sshfs-dir /home/yubo.wang/sshfs-dir
fuse: mountpoint is not empty【目录里面有a.c文件，不为空，难道不能挂载非空目录？】【-o nonempty】
fuse: if you are sure this is safe, use the 'nonempty' mount option[yubo.wang@localhost ~]$ sshfs root@192.168.201.132:/home/logread/sshfs-dir /home/yubo.wang/sshfs-dir
The authenticity of host '192.168.201.132 (192.168.201.132)' can't be established.【不检查key：-o StrictHostKeyChecking=no】
ECDSA key fingerprint is 0c:8d:16:d2:ff:d0:9a:02:0b:f5:ab:92:a9:02:f4:e3.
Are you sure you want to continue connecting (yes/no)? yes
root@192.168.201.132's password:
root@192.168.201.132's password:
root@192.168.201.132's password: 【密码怎么会不对？】
read: Connection reset by peer
[yubo.wang@localhost ~]$

难道是ubuntu不支持nfsd？不用root用户改为logread用户挂载成功

[yubo.wang@localhost ~]$ sshfs -o StrictHostKeyChecking=no logread@192.168.201.132:/home/logread/sshfs-dir /home/yubo.wang/sshfs-dir
logread@192.168.201.132's password:
[yubo.wang@localhost ~]$ logread@192.168.201.132:/home/logread/sshfs-dir on /home/yubo.wang/sshfs-dir type fuse.sshfs (rw,nosuid,nodev,relatime,user_id=1002,group_id=1002)logread@192.168.201.132:/home/logread/sshfs-dir   49G   40G  7.1G  85% /home/yubo.wang/sshfs-dir

读写文件成功,卸载成功

fusermount -u /home/yubo.wang/sshfs-dir

卸载Ubuntu的fuse

logread@logread:~$ sudo apt-get remove fuse
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:fuse ntfs-3g sshfs
0 upgraded, 0 newly installed, 3 to remove and 64 not upgraded.
After this operation, 1,620 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 120277 files and directories currently installed.)
Removing ntfs-3g (1:2017.3.23-2ubuntu0.18.04.2) ...
Removing sshfs (2.8-1) ...
Removing fuse (2.9.7-1ubuntu1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for initramfs-tools (0.130ubuntu3.8) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-96-generic
logread@logread:~$

fuse依然存在，sshfs命令消失，说明只卸载了sshfs命令，不能挂载其他设备，但能被挂载

logread@logread:~$ cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   ramfs
nodev   bdev
nodev   proc
nodev   cpuset
nodev   cgroup
nodev   cgroup2
nodev   tmpfs
nodev   devtmpfs
nodev   configfs
nodev   debugfs
nodev   tracefs
nodev   securityfs
nodev   sockfs
nodev   dax
nodev   bpf
nodev   pipefs
nodev   hugetlbfs
nodev   devptsext3ext2ext4squashfsvfat
nodev   ecryptfsfuseblk
nodev   fuse
nodev   fusectl
nodev   pstore
nodev   mqueuebtrfs
nodev   autofs

挂载是否成功：也能挂载，能看到文件

[yubo.wang@localhost ~]$ sshfs -o StrictHostKeyChecking=no logread@192.168.201.132:/home/logread/sshfs-dir /home/yubo.wang/sshfs-dir
logread@192.168.201.132's password:
[yubo.wang@localhost ~]$

重启ubuntu后也能被挂载。

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