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Create and Use an SSH Tunnel for Network Traffic

Port forwarding via SSH (SSH tunneling) creates a secure connection between your server and a remote machine through which any number of services can be relayed. One reason this can be useful is that you can pass traffic that uses an unencrypted protocol (e.g., IMAP, VNC) over an encrypted network stream to increase security. Our Security team is locking down our access, so let's get things done right. Our security team has dictated that all traffic leaving Datacenter 2 (where the CentOS 7 CLIENT is installed) must be encrypted. Since `yum` makes http calls that means that it can't run updates or install new packages with the current setup. Your SSH Tunnel SERVER is running a web server on port 80. Once the tunnel is set up another team will set the SERVER up as a yum repository. You've been tasked with setting up an SSH tunnel so that traffic can be encrypted from the CLIENT to the SERVER which will allow the CLIENT to install new packages. You should additionally create an SSH key so that a password isn't required to connect from the CLIENT to the SERVER as the user `cloud_user`.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Nov 12, 2018

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Table of Contents

  1. Challenge

    SSH from the CLIENT to the SERVER without a Password

    You need to generate an SSH key and copy it over to the SERVER from the CLIENT.

    To generate the key simply run: ssh-keygen and accept all defaults.

    To copy the key over to the SERVER simply run:

    ssh-copy-id [email protected] and enter the password.

  2. Challenge

    Verify SSH Tunnel Accessibility

    For this task you need to have an SSH tunnel set up. To do so, simply enter the following command:

    ssh -f [email protected] -L 2000: -N

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