Difference between revisions of "Unix and Linux Services"
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=== Linux Servers === | === Linux Servers === | ||
| − | '''linux.cs.odu.edu''' may be used to connect to | + | '''linux.cs.odu.edu''' may be used to connect to our services. |
| − | The old records | + | The following old records used in previous deployments of our cluster of linux servers will also forward you to linux.cs.odu.edu: |
| − | + | (if your ssh client returns an error while doing so, refer to 'Host Key Checking Failed' below) | |
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| + | '''atria.cs.odu.edu''' | ||
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| + | '''sirius.cs.odu.edu''' | ||
'''canis.infra.cs.odu.edu''' | '''canis.infra.cs.odu.edu''' | ||
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'''scorpii.infra.cs.odu.edu''' | '''scorpii.infra.cs.odu.edu''' | ||
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== Common Questions or Issues == | == Common Questions or Issues == | ||
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==== Solution ==== | ==== Solution ==== | ||
If you are on linux using OpenSSH, the simplest solution is to remove the old host key: | If you are on linux using OpenSSH, the simplest solution is to remove the old host key: | ||
| − | <code>ssh-keygen -R <hostname></code> | + | <code>ssh-keygen -R <hostname></code> |
| − | <code>SHA256: | + | Replacing <hostname> with the the host for which you received the error, for example <code>linux.cs.odu.edu</code> and then reconnect. You may verify the given ECDSA fingerprint by comparing it to: |
| + | |||
| + | <code>SHA256:Q2Y/JHxDJbvNITVsGpUITCZCn6zIpGXkj2v9fNa2gE4</code> | ||
If you are using PuTTY, simply click the yes button on the popup to update the cache of host keys and complete the connection. You may verify the given ssh-ed25519 fingerprint by comparing it to: | If you are using PuTTY, simply click the yes button on the popup to update the cache of host keys and complete the connection. You may verify the given ssh-ed25519 fingerprint by comparing it to: | ||
<code>The server's ssh-ed25519 key fingerprint is: | <code>The server's ssh-ed25519 key fingerprint is: | ||
| − | ssh-ed25519 255 | + | ssh-ed25519 255 c6:2f:cb:83:fc:b2:cf:4d:43:aa:1b:dc:43:23:80:fe</code> |
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== Home Directory == | == Home Directory == | ||
Revision as of 15:48, 28 September 2021
Contents
Student and Faculty Use Servers
The CS Department provides both Linux servers for use by CS students. To learn how to connect to these servers, please visit the SSH Access page.
Linux Servers
linux.cs.odu.edu may be used to connect to our services.
The following old records used in previous deployments of our cluster of linux servers will also forward you to linux.cs.odu.edu:
(if your ssh client returns an error while doing so, refer to 'Host Key Checking Failed' below)
atria.cs.odu.edu
sirius.cs.odu.edu
canis.infra.cs.odu.edu
betelgeuse.infra.cs.odu.edu
aspidiske.infra.cs.odu.edu
scorpii.infra.cs.odu.edu
Common Questions or Issues
Host Key Checking Failed
Problem
When our linux services recently migrated to a cluster of servers, the host keys associated with them changed. As a result, students who previously used ssh may receive one of the below error messages in their client since the migration:
In most linux environment using OpenSSH: 'Warning: Possible DNS Spoofing Detected!'
Using PuTTY on Windows: a popup saying 'Warning - Potential Security Breach!'
This is because your client is expecting the previous host key and not the new one. When this mis-match occurs, most ssh-clients by default refuse to complete the connection without intervention for security reasons.
Solution
If you are on linux using OpenSSH, the simplest solution is to remove the old host key:
ssh-keygen -R <hostname>
Replacing <hostname> with the the host for which you received the error, for example linux.cs.odu.edu and then reconnect. You may verify the given ECDSA fingerprint by comparing it to:
SHA256:Q2Y/JHxDJbvNITVsGpUITCZCn6zIpGXkj2v9fNa2gE4
If you are using PuTTY, simply click the yes button on the popup to update the cache of host keys and complete the connection. You may verify the given ssh-ed25519 fingerprint by comparing it to:
The server's ssh-ed25519 key fingerprint is:
ssh-ed25519 255 c6:2f:cb:83:fc:b2:cf:4d:43:aa:1b:dc:43:23:80:fe
Home Directory
When you log in to your Unix account, you are placed in your "Unix home directory". This will be the main working directory every time you log in. You can create and keep sub-directories,files and other important data in this directory.
Your home directory is backed up so it is advised to keep your data here. What is more, your Unix home directory gets mapped as your Windows Z-Drive so that you can share data between operating systems. Your Z-Drive can also be mapped to Apple Mac machines. To learn how you can do this, visit the Z-Drive Mac page.
Unix Permissions
Your security is important to us, and it should be very important to you. When you create files in your Unix home directory, you should be aware of the permissions you can set on these files. These permissions will determine whether or not your information can be viewed by other students in the department.
To understand how you can correctly set Unix permissions, please view the Unix Permissions page.
FTP Services
All files in your home directory can be access via FTP connection. To learn more, visit the FTP Services page.
