Commands using ssh

If you need to xdebug a remote php application, which is behind a firewall, and you have an ssh daemon running on that machine. you can redirect port 9000 on that machine over to your local machine from which you run your xdebug client (I am using phpStorm)

So, run this command on your local machine and start your local xdebug client, to start debugging.

more info:

http://code.google.com/p/spectator/wiki/Installing

Tomcat webapps are often remote links

To start X11 display only on your local machine: xeyes &

Extensions to basic command: ssh -X -f user@remotehost xcalc -bg black -fg green

(also works on Ubuntu) Copies the 'install,' 'hold,' 'deinstall' and 'purge' states of packages on the remote machine to be matched on the local machine. Note: if packages were installed on the local machine that were never installed on the remote machine, they will not be deinstalled by this operation.

This takes the stream created by apache requests containing jsp and funnels them to another server. I'm using this for simulating real time traffic. The nice command gives ssh maximum CPU cycles, awk & grep strip out everything served by apache. Putting parallel on curl is important because curl is synchronous and waits for the response. Yes, I thought about using wget but it didn't seem any easier. Also, if you figure out how to run this in the background let me know. Every time I background it it stops. If you have multiple front end servers just run multiple instances of this.

Booting the VM headless via VBoxHeadless requires knowledge of the VM's network in order to connect. Using VBoxManage in this way and you can SSH to the VM without first looking up the current IP, which changes depending on how you have your VM configured.

Sometimes you need to compare two config files on different servers. Put the file names into the above script and let 'er rip.

This uses ssh to transfer the contents of one Mac's clipboard to another's. This only works with plain text, sadly. Trying to transfer images will just clear out the remote machine's clipboard, and rich text will be converted to plain text. Using the "Remote Login" must be enabled on the remote machine (via System Preferences' Sharing panel) for this to work.

Admittedly, I'd never have thought of this without the earlier examples, but here's one that you can execute from your workstation to just display the image from another, without separately doing a file transfer, etc. By the way, I hear a loud beep coming from the other room, so I guess it's not too stealthy :-D

This will show the throughput between two nodes.

Thanks to szboardstretcher, who posted it here: http://www.linuxquestions.org/questions/linux-networking-3/quick-and-easy-way-to-measure-throughput-between-two-nodes-868998/

This version compresses the data for transport.

parrallel execution of a command on remote host by ssh or rsh or ...

very useful for cluster management (software update)

In the example above 3 tables are copied. You can change the number of tables. You should be able to come up with variants of the command by modifying the mysqldump part easily, to copy some part of remote mysql DB.

until (ssh root@10.1.1.39 2> /dev/null); do date; sleep 15; done

In this case will execute "date" then "sleep 15" until we are able to ssh into server, such as after a reboot

Could also be like:

until ( ping 10.1.1.39 1> /dev/null); do echo "server 10.1.1.39 is down"; sleep 15; done

Need to query hundreds of hosts with an ssh command ?

Of course you'll have setup keys on all your remote HOSTs. But in the case a key is not present this command will skip that node, proceeding on to the next.

-t:

Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote machine. Also prevents unwanted stty messages being sent to console

-q:

Quiet mode.

-o "BatchMode yes"

If set to yes, passphrase/password querying will be disabled. This option is useful in scripts and other batch jobs where no user is present

Useful to get network access to a machine behind shared IP NAT. Assumes you have an accessible jump host and physical console or drac/ilo/lom etc access to run the command.

Run the command on the host behind NAT then ssh connect to your jump host on port 2222. That connection to the jump host will be forwarded to the hidden machine.

Note: Some older versions of ssh do not acknowledge the bind address (0.0.0.0 in the example) and will only listen on the loopback address.

Simply makes it possible to launch any X application residing on sshhost through sshproxy and display it on your screen where ever you are.

This may be listed already but this command is useful to untar a specific directory to a different server.

Nice command for when you don't have scp available for whatever reason.

Works with binaries.

Record off the microphone on a remote computer and listen to it live through your speakers locally.