Juniper MX150 mount USB

1. Change the shell from Junos CLI to BSD shell.

   user@mx150> start shell
   %



2. Before inserting the USB device, check current disk device partitions. "192.168.1.1" is a fixed address for Linux host via internal connection.
   You can issue Linux command via SSH connection with Juniper private routing instance onward.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'ls /dev/sd*'
   /dev/sda
   /dev/sda1
   /dev/sda2
   /dev/sda3
   /dev/sda4
   /dev/sda5
   /dev/sda6
   /dev/sda7  <-- Currently there is only "sda(and number at the tail)" device found
   
   

3. Insert USB stick to MX150 box USB port. You can check the disk partition of USB from dmesg.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'dmesg | grep -i scsi'
   [600876.608516] scsi7 : usb-storage 3-1:1.0
   [600877.608645] scsi 7:0:0:0: Direct-Access     SanDisk  Cruzer Blade     1.27 PQ: 0 ANSI: 6
   [600877.616627] sd 7:0:0:0: [sdb] Attached SCSI removable disk <-- [sdb] is the device name

   Note: Or, you can check the disk partition of USB by lsblk command as well.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'lsblk -S'
   NAME HCTL       TYPE VENDOR   MODEL             REV TRAN
   sda  0:0:0:0    disk ATA      StorFly VSFBM6CC 0629 sata
   sdb  7:0:0:0    disk SanDisk  Cruzer Blade     1.27 usb    <-- sdb shows usb transport type

   There is certainly such disk partition attached in Linux host.

   %  ssh -JU __juniper_private4__ root@192.168.1.1 'ls /dev/sd*'
   /dev/sda
   /dev/sda1
   /dev/sda2
   /dev/sda3
   /dev/sda4
   /dev/sda5
   /dev/sda6
   /dev/sda7
   /dev/sdb    <-- "sdb" device is attached. (The last letter "b" may vary depending on your circumstance.)
   /dev/sdb1
   
   

4. Create a directory for the USB drive to mount in Linux host side.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'mkdir /var/tmp/usb'
   %
   
   

5. Mount the USB drive to the /var/tmp/usb directory in Linux host side.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'mount /dev/sdb /var/tmp/usb'

   如果mount失敗出現下面訊息:

   mount: /dev/sdb is write-protected, mounting read-only
   mount: wrong fs type, bad option, bad superblock on /dev/sdb,
          missing codepage or helper program, or other error
   
          In some cases useful info is found in syslog - try
          dmesg | tail or so.
   

   則先需格式化USB為etx4格式，使用下列指令：

   % ssh -JU __juniper_private4__ root@192.168.1.1 'mkfs -t ext4 /dev/sdb' 

   Check if it is properly mounted in Linux host.

   % ssh -JU __juniper_private4__ root@192.168.1.1 'mount | grep usb'
   /dev/sdb on /var/tmp/usb type ext2 (rw,relatime,errors=continue,user_xattr,acl)  <-- You can see this line
   

6. Copy any of files:
   a.  From MX150 storage to the USB disk(/var/tmp/usb directory) with the following SCP command:
   
   scp -JU __juniper_private4__ <filename> root@192.168.1.1:/var/tmp/usb/

   % scp -JU __juniper_private4__ /var/tmp/testfile.txt root@192.168.1.1:/var/tmp/usb/  <-- source-file name is "testfile.txt" in current directory
   testfile.txt                                  100%    9     0.0KB/s   00:00  <-- transfer completed
   
   %ssh -JU __juniper_private4__ root@192.168.1.1 'ls /var/tmp/usb'
   testfile.txt  <-- you can see the same file in the USB mounted directory

   
   b.  From the USB disk to MX150 storage with the following SCP command:
   
   scp -JU __juniper_private4__ root@192.168.1.1:/var/tmp/usb/<filename> <target_directory_in_MX150_Junos>

   % scp -JU __juniper_private4__ root@192.168.1.1:/var/tmp/usb/testfile.txt /var/tmp/  <-- source-file name is "testfile.txt" in USB destins "/var/tmp" directory in MX150
   
   

7. Unmount the USB drive after the file is completely copied:

   % ssh -JU __juniper_private4__ root@192.168.1.1 umount /var/tmp/usb
   
   

參考: Juniper