COMP30023 Week 01 – Prelab Part 2
School of Computing and Information Systems
COMP30023: Computer Systems
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Week 01 – Prelab Part 2
Once you have received your IP address from the comments of the LMS assignment, you should try to
connect to your VM.
1 Connecting to remote server using SSH
You will be connecting to your Virtual Machine (VM) instance using the SSH protocol. You will use
your private key (created in the previous section) to authenticate with the server. You will also need
the IP address of your instance which was sent to you.
We assume that you will be using your Linux VM to complete this and future lab exercises.
Let’s get connected!
If you are not on campus, you may need to connect to a University VPN (see https://studentit.
unimelb.edu.au/wireless-vpn/vpn).
If you have an internal VM IP address (172.16.0.0 – 172.31.255.255) because you indicated that you are
currently in Australia, use the general (Cisco AnyConnect) VPN.
If you have an external VM IP address (not within the 172.16.0.0/12 range – see above) because you
indicated that you are not currently in Australia and you are in Mainland China, use FortiClient.
Otherwise, you may use the general (Cisco AnyConnect) VPN.
1.1 The OpenSSH client
You can use the following command to directly log in to the remote instance.
$ ssh -i
If successful, you should see a welcome message.
If you get a “Permissions 0xxx for ’ If you are using WSL (Windows Subsystem for Linux), e.g. Ubuntu, you should move or generate the 1.1.1 What is It is the path to your private key file on your filesystem. Note: You will be assumed to have access to your allocated VM upon the completion of this prelab. https://studentit.unimelb.edu.au/wireless-vpn/vpn 1.2 SSH config (optional, for convenience) 1. Create a .ssh directory under your home directory, if it doesn’t already exist. 2. Copy both your public key and private key into the .ssh folder. e.g. 3. Create a file called config inside the .ssh folder with the following contents. Host comp30023 Host comp30023 How to create this file (Example)? • Linux: vim or your preferred text editor (a) $ cd ~/.ssh && touch config && open config If you see “Make Rich Text”, do not click it. • Windows: Important: do not remove the quotation marks, or you’ll be saving a .txt file. If you’re experiencing this issue outside class time, you should rename config to another If you get ”Bad owner or permissions on ~/.ssh/config” on *nix (not Windows). Execute commands1: $ chmod 600 ~/.ssh/config You should now be able to access your VM with the command: 1https://serverfault.com/questions/253313 https://serverfault.com/questions/253313 Connecting to remote server using SSH SSH config (optional, for convenience) 程序代写 CS代考 加微信: powcoder QQ: 1823890830 Email: powcoder@163.com
Execute the following to set the private key to be only readable by the owner of the file (*nix only).
$ chmod 600
private key under the WSL home directory ( cd ~ ), and not a directory shared with Windows (e.g.
/mnt/c/… ), because Windows’ file system does not support Unix permissions.
If you have followed the instructions of Part 1 precisely, it should be ~/
*nix or C:\Users\
Alternatively, you may cd into that directory, after which you can simply specify
Unless otherwise stated, you’ll be expected to use your VM for all practicals.
Though you are welcome to find methods to complete activities on your local machine and seek help on
the discussion forum or ask demonstrators in workshops, we do not guarantee support in this regard.
https://studentit.unimelb.edu.au/wireless-vpn/vpn
It may be somewhat annoying to type out (or copy-paste) the entire ssh command each time. To save
time, a SSH config file can be created and used to specify SSH hosts as well as options for each host.
*nix: $ mkdir -p ~/.ssh
Windows: $ mkdir %HOMEPATH%\.ssh
*nix: $ cp
Windows: Using File Explorer or similar commands
HostName
IdentityFile
User
HostName 115.146.92.110
IdentityFile ~/.ssh/stevent2_key
User stevent2
(b) Open the Format menu, if you see “Make Plain Text”, click it.
(c) Type in the contents
(a) Open Notepad
(b) Type in the contents
(c) File -> Save, browse to the .ssh folder that was created (e.g. C:\Users\steven\.ssh )
(d) File name: “config” , Save as type: All files
(e) If you get errors like “Bad owner or permissions on …config”, ask your demonstrator.
name and ask your demonstrator to help you debug this during your next class.
Use the ssh -i command in the mean time.
$ chown $USER ~/.ssh/config
$ ssh comp30023
The OpenSSH client
What is