How to Log in to a Synology DiskStation using SSH keys as a user!

Today we make few steps to setup ssh login with ssh public key as user.
In this tutorial we use user admin as local user for ssh login.

We login from other linux machine to synology to make backup here with rsync.

1. Create or copy file .ssh
   
$ cp -R .ssh /volume1/homes/admin
$ ls -l /volume1/homes/admin/
drwx------2 root root 4096 Jan 15 13:11 .ssh


2. Change owner
   
$ chown -R admin.users .ssh
$ ls -l
drwx------2 admin users 4096 Jan 15 13:11 .ssh


3. Change write on files
   
$ chmod 750 /volume1/homes/admin/
$ chmod 700 /volume1/homes/admin/.ssh/
$ chmod 600 /volume1/homes/admin/.ssh/authorized_keys


4. Test if it works
   
[root@mail ~]# ssh -p 22 admin@109.122.61.66
admin@DS115j:~$


Source
NOTE: I’m assuming that you have already generated your SSH keys. How to generate ssh key?