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| + | |- style="vertical-align:top;" |
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| − | |- |
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| + | | Im normalen Ubuntu-Repository |
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| − | | [[Image:Diamond-caution.png]] || Beta Test. Please give feedback. || [[Image:Diamond-caution.png]] |
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| + | * [[Arora]] -- QT |
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| − | |- |
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| + | * [[Chromium]] |
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| + | * [[Epiphany]] -- Gnome |
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| + | * [[Firefox]] |
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| + | * [[Konqueror]] -- KDE |
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| + | * [[Midori]] |
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| + | * [[Qupzilla]] --QT |
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| + | * [[Rekonq]] -- KDE |
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| + | * [[Dillo]] |
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| + | | CLI |
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| + | * [[ELinks]] |
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| + | * [[Links2]] |
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| + | * [[Lynx]] |
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| + | * [[W3m]] |
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| + | | "Extern" |
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| + | * [[Opera]] |
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| + | * [[Vivaldi]] |
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| + | * [[Iridium]] |
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| + | * [[SRWare Iron]] |
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| + | * [[Tor Browser]] |
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| + | [[Kategorie:Web]] |
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| − | |||
| − | == Usage == |
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| − | Simply use SSH to login to this machine: |
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| − | <big> |
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| − | '''ssh user@shell.stud.informatik.uni-goettingen.de''' |
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| − | </big> |
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| − | Note that the intially presented banner contains something like |
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| − | ####### shell.stud.informatik.uni-goettingen.de - login vm: '''shell5.cip.loc''' |
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| − | ...telling you the actual local name of the automatically chosen destination machine. |
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| − | For '''Windows''': use [[PuTTY]] (simple) or [[Cygwin]] (more complex and powerful) or any other SSH-implementation. |
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| − | |||
| − | |||
| − | === Target audience === |
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| − | These machines are meant to be used by students. But ''of course'' they can be used by any staff members! (For first time users: the only requirement is to logon one single time using one of the (physical) pool computers - this will make them "known" to our systems.) |
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| − | |||
| − | === Load Balancing === |
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| − | This term is misleading on this specific installation: the default algorithm being used is simply "round-robin" - you'll get connected the "next" machine one after another. If you landed on an overcrowded system simply disconnect/reconnect to use another machine. |
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| − | |||
| − | === Legacy <tt>login.stud</tt> === |
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| − | Both <tt>login.stud.informatik.uni-goettingen.de</tt> and <tt>login.informatik.uni-goettingen.de</tt> are not affected by this new approach. They "old" machines will continue to work unmodified. |
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| − | |||
| − | === Timeout === |
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| − | * The session Timeout is set to '''36 hours''' -- this is the HAproxy related Timeout regarding the TCP connection |
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| − | * [[Kerberos]]/[[OpenAFS]] have separate/shorter timeouts. You need to <tt>kinit && aklog</tt> when you're approaching timeout. |
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| − | |||
| − | === Availability === |
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| − | Take a look at: http://shell.stud.informatik.uni-goettingen.de/ -- use <tt>ifi</tt>/<tt>ifi</tt> to login <small>("bots not welcome")</small> |
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| − | |||
| − | == Self defense of the servers == |
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| − | Usually we do utilize "<tt>fail2ban</tt>" to chase brute force attempts to hack login credentials. For technical reasons this is not possible for this "<tt>haproxy</tt>" approach. The workaround is: |
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| − | {| style="border: 1pt black dashed" |
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| − | |- |
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| − | | [[Image:Diamond-caution.png]] || We do limit the rate of new (<tt>tcp-</tt>) connections from any given source IP address to 1 per minute.|| [[Image:Diamond-caution.png]] |
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| − | |- |
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| − | |} |
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| − | When you're going to login via ssh you usually have three tries to enter your password. Technically this is ''one'' single connection! The next three tries come with the next connection, which is only possible after one minute. Going to to log in too early gives just a generic error message: |
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| − | |||
| − | ~# ssh username@shell.stud.informatik.uni-goettingen.de |
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| − | ssh_exchange_identification: read: Connection reset by peer |
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| − | This behavior should be fine for "normal" users where one person has a different IP address than other people. |
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| − | If you are a group of students behind NAT this would be a problem. We need yet to find out if this might be a problem for students residential establishment in Göttingen. |
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| − | |||
| − | == Tips 'n' Tricks == |
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| − | |||
| − | === Connect to the same machine again === |
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| − | Circumventing the Round-Robin mechanism is possible: connect to a specific port <tt>42000+''n''</tt> withh <tt>''n''={1..6}</tt> :-) |
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| − | For maschine number 4: |
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| − | |||
| − | ~$ ssh -p 42004 username@shell.stud.informatik.uni-goettingen.de |
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| − | ####### |
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| − | ####### shell.stud.informatik.uni-goettingen.de - login vm: shell4.cip.loc |
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| − | |||
| − | == Todo == |
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| − | * Documentation |
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| − | * Testing! -- currently in BETA |
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| − | |||
| − | == See also == |
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| − | * [[Remote Access]] |
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| − | * [[Long Running Processes]] |
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| − | == Links == |
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| − | * https://help.ubuntu.com/ -- common help regarding Ubuntu |
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| − | * http://shell.stud.informatik.uni-goettingen.de/ -- current state of the load balancer. Use <tt>ifi</tt>/<tt>ifi</tt> to login <small>''("bots not welcome")''</small> |
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| − | [[Category:Pool]][[Category:Remote]] |
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