I have 10 Linux servers.
To connect to server every time I have to execute the ssh command to login.
I need one single shell script to login to a remote server.
e.g if server is host name is testhost.com, user is user1 and pass password
when I give the user name user1 in terminal, it should automatically execute the shell script and logged in to remote server for the user user1
Hi i know this is an old question but here is a way to do it follow the link above from the #nick hartung then after that since you have 10 servers you call each server by name so say 'server1' or any name you like but for this example ill name one of the servers 'server1' also remember to change the port from 22 to something else eg 22277 so create a script and name it server1 and the put this in it
#!/bash/bin
ssh username#hostname -p22277
then move the script to user bin
$ sudo chmod 600 server1
$ sudo mv server1 /usr/bin/
then now u can just login to the remote host like this
$ server1
the you will be automatically logged in.
You can write a script that will take a username as a parameter and ssh to the correct host based on that. A quick example:
if [ "$1" == "username" ]; then
ssh username#hostname
fi
if [ "$1" == "username2" ]; then
...
However, the ssh command doesn't have a built in way to provide a password AFAIK. You shouldn't be storing your passwords in a script anyway. The way to get around this is to set up automatic authentication by creating a key pair using ssh-keygen. Here is a link that will show you how to set this up.
Related
I have 3 servers,
server1 -> server2 -> server3
Server2 is reachable only via server 1 and server3 via server2.
Every time connection breaks I have to manually login to both the servers.
Is there any way to login and open bash terminal to server3 through this path via a script?
I have had same problem and I have a solution. I use xdotool to emulate keys (and xclip to copy password that is extracted from other file). This script opens ssh connections to list of servers in separate console tabs. Edit it according to Your needs.
for IP in $SERVERS
do
xdotool key ctrl+shift+t type "ssh $USER#$IP"
xdotool key Return
sleep 1
xdotool key ctrl+shift+v
xdotool key Return
done
Script simply iterate over table of servers. It opens new console tab, prints "ssh some_user#some_ip" and next emulate retrun key.
Sleep is used just to make sure script has enought time to connect to server. At the end password is pasted and You enter first server.
One more thing:
dont touch keyboard while script is running. I hope it can help You.
Use a ssh_config file, this will allow you to easily set this up and then directly connect by using ssh -F ssh_config servername.
Assuming you're logged in to server_1 and want to connect to server_3 via server_2 it would look something like this:
Host server_2
HostName xxx.xxx.xxx.xxx
Port xxxx
User server2_user
Host server_3
HostName xxx.xxx.xxx.xxx
Port xxxx
ProxyCommand ssh -F ssh_config server_2
User server3_user
With this you can use ssh -F ssh_config server_3 and it will connect to server_2 and from there take you directly to server_3.
If you put the ssh_config in the default location you can also omit the -F ssh_config part (in the command and the config file) since it will get picked up automatically.
For more information check out this link, or search the web for 'ssh jumphost', that's a more widely used description for your setup (server 2 is jumphost for server 3 in your case).
I am trying to login to Server B from Server A and perform simple UNIX commands on Server B using a shell script. The code is as follows. But ls -al is displaying the result of Server A and not the one that is logged on to i.e Server B. Any inputs are highly appreciated. Thanks
#!/bin/bash
clear
sshpass -p password ssh hostname
ls -al
exit
When the shell interprets a script file, it creates a child process to
execute each command line. So, the command lines after sshpass -p password ssh hostname are not actually executed inside the ssh
session to hostname, but in the host where the bash instance is
running.
To achieve what you want, you can check ssh(1) usage line and note that there is a [command] argument, that says:
If command is specified, it is executed on the remote host instead
of a login shell.
So, one way to do it is sshpass -p password ssh hostname ls -la. Another way which can provide some more flexibility is:
#!/bin/bash
clear
cat | sshpass -p password ssh hostname <<EOF
ls -la
EOF
Which would make ssh start a login shell in the remote host and pass
to its stdin the lines provided in the Here Document. The remote
shell would then interpret those strings as commands and execute them.
If you just want to run ls -al on the remote server, put it on the same line as the ssh command like
sshpass -p password ssh hostname ls -al
it will automatically exit when it gets to the end of the command so you don't need to put exit
Also, if you're going to be doing this and don't want to interactively enter the password, you might want to look at sharing public/private keys and using that so it won't ever ask for a password (unless you password protect your private key)
Is it possible to display the local user on remote host?
eg.:
local_user#ownpc$ ssh remote_user#server
then
echo $some_variable_containing_local_user
that results local_user
Purpose: I have a very limited read access to a UNIX server, i'd like to perform scp from remote to local over the current ssh session. Performed via a shell script, regardless of who logged in. (without any additional installs or local variable modifications)
Ps.: I am not looking for scp ssh:user#host/folder/file /home/user/folder
Thank you!
Using an unquoted here-doc allows local variables to be expanded before passing the commands to ssh
local_user#ownpc$ ssh remote_user#server <<END
echo you are $USER
END
should output
you are local_user
That may give you a basis to script your remote actions in the here-doc.
I'm not 100% clear on your situation but both of these methods work for me:
ssh remote_user#remote_host whoami
and
ssh remote_user#remote_host 'echo $USER'
The first executes "whoami" on the remote host while the second echos out what $USER is set to in the remote shell. I'm a little surprised the second one works because often ssh remote executing does not start a shell but it appears to work anyway.
Hi, my name is Evan, newbie on UNIX :)
i want to ask about scripting on unix. here is the case :
i have 4 unix server (with freeBSD OS), let call them "Gorrila's"
And one gateway server (also, with unix FreeBSD OS), Let call this one "Monkey's"
if i want access and login to Gorillas server, i have to using putty to access Monkey and then, from monkey doing ssh connection to enter Gorillas server.
The case is, my boss asking to me, to get an apache error log, everday, in fourth of gorrila's server.
All this time, i am doing manually. putty to monkeys - ssh to gorrilas - copy error log into monkey server using scp command and then, get error log with winscp from monkeys server.
the problem is :
how to make script with this case ?
how to rename automatically the error_log because, error log name in every server has a same name. which is "01_error.log". i had to rename it manually so they can't replace each other.
i hope, somebody can help me with this.
All, Thank you for your help and time. and sorry for the bad english language. :)
The easiest way to accomplish this would be to setup an automated job on Gorilla4.
Your first problem, is that you'll need to setup password-less SSH access between Gorilla4 and Monkey so you don't need a person to physically type in the password.
While you can do this with the 'root' user I would STRONGLY recommend against it.
Instead create a maintenance user on BOTH hosts:
$ useradd -m maintuser
Then switch to the new user and create SSH key on Gorilla4:
$ ssh-keygen -t rsa -b 2048
Accept the defaults when prompted. Then copy the id_rsa.pub file to the ~/.ssh directory of the maintuser on Monkey.
Now, when you are the "maintuser" on Gorilla4, you can SSH to Monkey without a password.
Then you can create a script called "copy_log.sh":
#!/bin/bash
# copy_log.sh
log_path="/path/to/logdir"
log_name="01_error.log"
target_host="monkey"
echo "copying ${log_name} to ${target_host}..."
# note: $(hostname) below will add "Gorilla4" to the name of the file
scp ${log_path}/${log_name} maintuser#${target_host}:/path/to/dest/$(hostname)_${log_name} || {
echo "Failed to scp file"
exit 2
}
echo "completed successfully"
Make it executable:
$ chmod +x copy_log.sh
Add it to the maintuser's crontab on Gorilla4 to run at whatever time you would nomrally do it yourself, say 8am everyday:
00 08 * * * /path/to/copy_log.sh >> /some/log/dir/copy_log.out 2>&1
Hope this helps; if nothing else, it will give you plenty to Google :)
I want to write a shell script to ssh to another unix server with another username.
Unix server which I am using is SunOS.
I have tried many options such as expect tool and sshpass but none of them worked, can someone help me with the script using sshpass as I have heard that it provides a secure login.
If you are user bob on the localhost and want to ssh to sunmachine as fred you would do:
$ ssh fred#sunmachine
This would log you into sunmachine as fred, not bob.
You can also use the config file ~/.ssh/config to set aliases:
Host sun
Host sunmachine.domain.co.uk
User fred
Now you can just type (as any user):
$ ssh sun
# ssh fred#sunmachine.domain.co.uk <- the un-aliased command that is run
Note: Set up key based authenitication so you are not prompted to enter your password.