I am developing a script that will automatically keep a folder on two workstations synchronized using rsync. So far, I have gotten everything to work but I have one small thing I haven't figured out. Once, the rsync command is executed, it prompts for the password of the other workstation. However, I haven't been able to find a way to automatically enter that password once prompted in the terminal. I tried using the expect command, but that didn't work as the command didn't execute until after I enter the password.
Is there a solution to this?
Here is my script. I have two instances of the same VM, hence the same usernames
#!/bin/bash
LOCAL="/home/rams/Documents/"
RSYNC_OPTIONS="-avh --progress /home/rams/Documents/ rams#192.168.1.39:/home/rams/Downloads/"
PASSWORD="rams2020"
while true
do
inotifywait -e modify $LOCAL
rsync $RSYNC_OPTIONS
done
Solution shown here:
https://stackoverflow.com/a/3299970/8860865
TL;DR - Use an SSH keygen to generate a keyfile that will authenticate upon using the rsync command and the password is prompted. https://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/
Related
At work on a Linux server, I try to find a way to execute a script by crontab(in root) for:
Log into a local user by ssh with the command ssh -X user#localhost
answer at the password question for the user
execute a command
wait the end
exit ssh session
I make the process because it works when I do this manually.
I can't use crontab Otherwise than in root.
I try to add a public key for avoid the password step but I don't succeed into.
I must execute my command log into a specific user.
And finally I find a way to get environnement variables with the options -X ... if I log into the specific user with the command su -l user ... my command won't works.
I don't know if I am clear, I am sorry because my knowledge in Linux environments are limited and I try my best to explain to you in an approximate English (I'm French)
Best regards
Sorry I may not enough explicit I will try differently
First of all my first message is not too specific because I don't know if my way to deal with my issue is the best way that why I had explain it in a general way
Like I said I must configure crontab with root user, but the command (specific command of an application installed on my Linux server) that I try to execute automatically must be execute with a specific server user.
With all those constraints I try to develop an except script
[code]
!/usr/bin/expect
spawn ssh -X specific-user#localhost
expect "assword :"
send "PASSWORD\r"
sleep 10
SpecificUtility + some parameters
Expect "localhost #"
Send "exit\r"
interact [/code]
If I execute this script manually it is ok but in crontab the sequence if not respected
I do something wrong but I have no clue
I hope explain it better
Best regards
how to run commands like ftp or sftp or scp in background? Also how to setup password less connection for running these command?
Look for manual pages for scp or rsync, which both can do this job well, if not being forced you don't want to use sftp or even the non encrypted ftp file transfer!
something like the following, for example:
rsync [some other parameters] -e ssh SOURCE TARGET
Assuming these commands are coming from a bash script , you would need to make sure that the two (or more ) systems have ssh certificates generated that allow you to access said systems without providing a "password" per se.
Briefly, you could do it by running this command on one system:
ssh-keygen
following through, this will generate a key. Then run:
ssh-copy-id user#some-remote-system
to copy it to the remote system, which will allow passwordless access, enabling scripts to go about their business without stalling for password prompts.
I'm trying to do an rsync backup from dreamhost to another host, here's the command i'd like to use:
nohup rsync -e "/usr/bin/ssh" --bwlimit=2000 -av username#server.dreamhost.com:remote_directory local_directory&
I'd like the process to keep running in the background and even when I disconnect. Problem is, I don't know how to put in the password when it's a background process. How do I do this?
Usually this is done by not requiring a password at all. Instead, consider configuring SSH to use a public key. There are several resources online (such as this one from dreamhost) that can help you do that.
I would use a key. If you need to protect the key with a password or you cannot use a key for whatever reason, then use expect to pass the password:
rsync_auto.sh:
#/bin/bash
expect <<<EOF
spawn nohup rsync -e "/usr/bin/ssh" --bwlimit=2000 -av username#server.dreamhost.com:remote_directory
expect "password:"
send "your_password\r"
expect eof
EOF
!!!Make sure that nobody except you can access the file!!!:
chmod 500 rsync_auto.sh
A little bit more elaborated way might be to store the password in a keyring application, like gnome-keyring instead of storing them in a plain file. I've found this article if you are interested.
Hi I have been given a task of copying files from a given server to local machine. Even I can do it manually using the command line but I need to write a script to automate it. I dont have any clue how to do it using shell, how to give the password which we would have done manually. I went through other posts but did not get the precise answer.
Are there better ways than using SCP command?
Thanks in advance
The preferred + more secure way to do this is to set up ssh key pairs
That being said, if there's a specific need to supply passwords as part of your shell script, you can use pscp, which is part of putty-tools:
If you are on ubuntu, you can install it by:
sudo apt-get install putty-tools
(Or use equivalent package managers depending on your system)
Here's an example script of how to use pscp:
#!/bin/bash
password=hello_world
login=root
IP=127.0.0.1
src_dir=/var/log
src_file_name=abc.txt
dest_folder=/home/username/temp/
pscp -scp -pw $password $login#$IP:$src_dir/$src_file_name $dest_folder
This copies /var/log/abc.txt from the specified remote server to your local /home/username/temp/
I am fully aware that this question has been asked many times but I cant able to find any solution which satisy my requirement.
Task -> I need to transfer files from machine A to machineB and remotely execute scripts on Machine B. Due to my limitation I cant able to use keygen, expect utility or any other utility which requires to install packages. To Transfer the file I need to give password and I want to give password in Url. as this will run inside bash script and requires no user interference .
My investigation- I thought of using scp but realise, its not possible to give password at command prompt. So i wondering , if there is any other alternative from rsync .
below is the small attempt
#!/bin/bash
PATH=/usr/bin:/usr/sbin:/bin:/sbin
USER="bob"
RSYNC_PASSWORD="blue"
MACHINE_B="192.168.200.2"
if ping -c 1 -W 1 $MACHINE_B
then
echo "There is machine b as well"
echo " cheking to transfer file to machine b"
rsync lol.sh 192.168.200.2:/home/bob/
fi
Thanks and regards,
Sam
I have tried various option mentioned above ,, but unfortunately none of them works in my case. But I would like to thanks everyone for helping me and surely I have learned few new things specially rsync.
In my case, I have to rely on ssh keys to make it work.
From the rsync man page:
Some modules on the remote daemon may require authentication. If so, you will receive a password prompt when you connect. You can avoid the password
prompt by setting the environment variable RSYNC_PASSWORD to the password you want to use or using the --password-file option. This may be useful
when scripting rsync.