Copy ssh public key to multiple Linux hosts












10














I am trying to copy .ssh/id_rsa.pub from our central server to multiple servers. I have the following script which I usually use to push changes to the different servers.



#!/bin/bash





for ip in $(<IPs); do

    # Tell the remote server to start bash, but since its

    # standard input is not a TTY it will start bash in

    # noninteractive mode.

    ssh -q "$ip" bash <<-'EOF'







EOF



done


But in this case, I need to cat the public key on the local server and then add that to multiple servers. Is there a way by using the above here document script to execute the following. 



cat .ssh/id_rsa.pub |ssh tony@0.0.0.0 'cat > .ssh/authorized_keys'





shell-script ssh







share|improve this question
























  • why you need to cat on local since you're copied from one central location to remotes ?
    – klerk
    Jul 17 '14 at 21:43










  • I need to add central server's public key hence local server. Sorry for the confusion.
    – user67186
    Jul 17 '14 at 21:48
















10














I am trying to copy .ssh/id_rsa.pub from our central server to multiple servers. I have the following script which I usually use to push changes to the different servers.



#!/bin/bash





for ip in $(<IPs); do

    # Tell the remote server to start bash, but since its

    # standard input is not a TTY it will start bash in

    # noninteractive mode.

    ssh -q "$ip" bash <<-'EOF'







EOF



done


But in this case, I need to cat the public key on the local server and then add that to multiple servers. Is there a way by using the above here document script to execute the following. 



cat .ssh/id_rsa.pub |ssh tony@0.0.0.0 'cat > .ssh/authorized_keys'





shell-script ssh







share|improve this question
























  • why you need to cat on local since you're copied from one central location to remotes ?
    – klerk
    Jul 17 '14 at 21:43










  • I need to add central server's public key hence local server. Sorry for the confusion.
    – user67186
    Jul 17 '14 at 21:48














10












10








10


5





I am trying to copy .ssh/id_rsa.pub from our central server to multiple servers. I have the following script which I usually use to push changes to the different servers.



#!/bin/bash





for ip in $(<IPs); do

    # Tell the remote server to start bash, but since its

    # standard input is not a TTY it will start bash in

    # noninteractive mode.

    ssh -q "$ip" bash <<-'EOF'







EOF



done


But in this case, I need to cat the public key on the local server and then add that to multiple servers. Is there a way by using the above here document script to execute the following. 



cat .ssh/id_rsa.pub |ssh tony@0.0.0.0 'cat > .ssh/authorized_keys'





shell-script ssh







share|improve this question















I am trying to copy .ssh/id_rsa.pub from our central server to multiple servers. I have the following script which I usually use to push changes to the different servers.



#!/bin/bash





for ip in $(<IPs); do

    # Tell the remote server to start bash, but since its

    # standard input is not a TTY it will start bash in

    # noninteractive mode.

    ssh -q "$ip" bash <<-'EOF'







EOF



done


But in this case, I need to cat the public key on the local server and then add that to multiple servers. Is there a way by using the above here document script to execute the following. 



cat .ssh/id_rsa.pub |ssh tony@0.0.0.0 'cat > .ssh/authorized_keys'





shell-script ssh




shell-script ssh






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jul 17 '14 at 22:22









Gilles

528k12810561583




528k12810561583










asked Jul 17 '14 at 21:38









user67186

1572411




1572411












  • why you need to cat on local since you're copied from one central location to remotes ?
    – klerk
    Jul 17 '14 at 21:43










  • I need to add central server's public key hence local server. Sorry for the confusion.
    – user67186
    Jul 17 '14 at 21:48


















  • why you need to cat on local since you're copied from one central location to remotes ?
    – klerk
    Jul 17 '14 at 21:43










  • I need to add central server's public key hence local server. Sorry for the confusion.
    – user67186
    Jul 17 '14 at 21:48
















why you need to cat on local since you're copied from one central location to remotes ?
– klerk
Jul 17 '14 at 21:43




why you need to cat on local since you're copied from one central location to remotes ?
– klerk
Jul 17 '14 at 21:43












I need to add central server's public key hence local server. Sorry for the confusion.
– user67186
Jul 17 '14 at 21:48




I need to add central server's public key hence local server. Sorry for the confusion.
– user67186
Jul 17 '14 at 21:48










4 Answers
4






active

oldest

votes


















16














With this simple loop you can automate it and spread to all remote servers.



#!/bin/bash

for ip in `cat /home/list_of_servers`; do

    ssh-copy-id -i ~/.ssh/id_rsa.pub $ip

done





share|improve this answer





















  • Hi, I accept your anwser and it worked fine. Thanks
    – user67186
    Jul 17 '14 at 22:16










  • +1. I'm a big fan of a very easy scripting style that get the job done!
    – Laith Al Obaidy
    Dec 24 at 19:12



















2














For copying your public key, you have something in-built in openssh itself. So instead of cat and ssh use this :-



ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR-REMOTE-HOST





share|improve this answer





















  • I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
    – user67186
    Jul 17 '14 at 21:52



















0














The accepted answer won't work if one needs to put someone else's public key to multiple machines. So, I've come up with the following solution:



cat add-vassal-tc-agents.sh



#!/bin/bash

set -x # enable bash debug mode

if [ -s vassal-public-key.pub ]; then # if file exists and not empty

    for ip in `cat tc-agents-list.txt`; do # for each line from the file

        # add EOL to the end of the file and echo it into ssh, where it is added to the authorized_keys

        sed -e '$s/$/n/' -s vassal-public-key.pub | ssh $ip 'cat >> ~/.ssh/authorized_keys'

    done

else

    echo "Put new vassal public key into ./vassal-public-key.pub to add it to tc-agents-list.txt hosts"

fi


This script adds the new key to the users on the list of machines, provided that the environment it is run on has the access.



Example of tc-agents-list.txt:



root@10.10.0.1

root@10.10.0.2

root@10.10.0.3

root@10.10.0.4





share|improve this answer





























    0














    Here is my simple script to copy ssh-keygen to multiple servers without asking password everytime.



    for server in `cat server.txt`;  
    
do  
    
    sshpass -p "password" ssh-copy-id -i ~/.ssh/id_rsa.pub user@$server  
    
done





    share|improve this answer























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      4 Answers
      4






      active

      oldest

      votes








      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      16














      With this simple loop you can automate it and spread to all remote servers.



      #!/bin/bash
      
for ip in `cat /home/list_of_servers`; do
      
    ssh-copy-id -i ~/.ssh/id_rsa.pub $ip
      
done





      share|improve this answer





















      • Hi, I accept your anwser and it worked fine. Thanks
        – user67186
        Jul 17 '14 at 22:16










      • +1. I'm a big fan of a very easy scripting style that get the job done!
        – Laith Al Obaidy
        Dec 24 at 19:12
















      16














      With this simple loop you can automate it and spread to all remote servers.



      #!/bin/bash
      
for ip in `cat /home/list_of_servers`; do
      
    ssh-copy-id -i ~/.ssh/id_rsa.pub $ip
      
done





      share|improve this answer





















      • Hi, I accept your anwser and it worked fine. Thanks
        – user67186
        Jul 17 '14 at 22:16










      • +1. I'm a big fan of a very easy scripting style that get the job done!
        – Laith Al Obaidy
        Dec 24 at 19:12














      16












      16








      16






      With this simple loop you can automate it and spread to all remote servers.



      #!/bin/bash
      
for ip in `cat /home/list_of_servers`; do
      
    ssh-copy-id -i ~/.ssh/id_rsa.pub $ip
      
done





      share|improve this answer












      With this simple loop you can automate it and spread to all remote servers.



      #!/bin/bash
      
for ip in `cat /home/list_of_servers`; do
      
    ssh-copy-id -i ~/.ssh/id_rsa.pub $ip
      
done






      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Jul 17 '14 at 21:51









      klerk

      1,4141913




      1,4141913












      • Hi, I accept your anwser and it worked fine. Thanks
        – user67186
        Jul 17 '14 at 22:16










      • +1. I'm a big fan of a very easy scripting style that get the job done!
        – Laith Al Obaidy
        Dec 24 at 19:12


















      • Hi, I accept your anwser and it worked fine. Thanks
        – user67186
        Jul 17 '14 at 22:16










      • +1. I'm a big fan of a very easy scripting style that get the job done!
        – Laith Al Obaidy
        Dec 24 at 19:12
















      Hi, I accept your anwser and it worked fine. Thanks
      – user67186
      Jul 17 '14 at 22:16




      Hi, I accept your anwser and it worked fine. Thanks
      – user67186
      Jul 17 '14 at 22:16












      +1. I'm a big fan of a very easy scripting style that get the job done!
      – Laith Al Obaidy
      Dec 24 at 19:12




      +1. I'm a big fan of a very easy scripting style that get the job done!
      – Laith Al Obaidy
      Dec 24 at 19:12













      2














      For copying your public key, you have something in-built in openssh itself. So instead of cat and ssh use this :-



      ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR-REMOTE-HOST





      share|improve this answer





















      • I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
        – user67186
        Jul 17 '14 at 21:52
















      2














      For copying your public key, you have something in-built in openssh itself. So instead of cat and ssh use this :-



      ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR-REMOTE-HOST





      share|improve this answer





















      • I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
        – user67186
        Jul 17 '14 at 21:52














      2












      2








      2






      For copying your public key, you have something in-built in openssh itself. So instead of cat and ssh use this :-



      ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR-REMOTE-HOST





      share|improve this answer












      For copying your public key, you have something in-built in openssh itself. So instead of cat and ssh use this :-



      ssh-copy-id -i ~/.ssh/id_rsa.pub YOUR-REMOTE-HOST






      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered Jul 17 '14 at 21:44









      beginer

      2,0181117




      2,0181117












      • I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
        – user67186
        Jul 17 '14 at 21:52


















      • I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
        – user67186
        Jul 17 '14 at 21:52
















      I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
      – user67186
      Jul 17 '14 at 21:52




      I want to execute the command copying central server's public to remote servers which exist in IP file. The script iterates through them. So, your example may not be useful here. Thanks
      – user67186
      Jul 17 '14 at 21:52











      0














      The accepted answer won't work if one needs to put someone else's public key to multiple machines. So, I've come up with the following solution:



      cat add-vassal-tc-agents.sh



      #!/bin/bash
      
set -x # enable bash debug mode
      
if [ -s vassal-public-key.pub ]; then # if file exists and not empty
      
    for ip in `cat tc-agents-list.txt`; do # for each line from the file
      
        # add EOL to the end of the file and echo it into ssh, where it is added to the authorized_keys
      
        sed -e '$s/$/n/' -s vassal-public-key.pub | ssh $ip 'cat >> ~/.ssh/authorized_keys'
      
    done
      
else
      
    echo "Put new vassal public key into ./vassal-public-key.pub to add it to tc-agents-list.txt hosts"
      
fi


      This script adds the new key to the users on the list of machines, provided that the environment it is run on has the access.



      Example of tc-agents-list.txt:



      root@10.10.0.1
      
root@10.10.0.2
      
root@10.10.0.3
      
root@10.10.0.4





      share|improve this answer


























        0














        The accepted answer won't work if one needs to put someone else's public key to multiple machines. So, I've come up with the following solution:



        cat add-vassal-tc-agents.sh



        #!/bin/bash
        
set -x # enable bash debug mode
        
if [ -s vassal-public-key.pub ]; then # if file exists and not empty
        
    for ip in `cat tc-agents-list.txt`; do # for each line from the file
        
        # add EOL to the end of the file and echo it into ssh, where it is added to the authorized_keys
        
        sed -e '$s/$/n/' -s vassal-public-key.pub | ssh $ip 'cat >> ~/.ssh/authorized_keys'
        
    done
        
else
        
    echo "Put new vassal public key into ./vassal-public-key.pub to add it to tc-agents-list.txt hosts"
        
fi


        This script adds the new key to the users on the list of machines, provided that the environment it is run on has the access.



        Example of tc-agents-list.txt:



        root@10.10.0.1
        
root@10.10.0.2
        
root@10.10.0.3
        
root@10.10.0.4





        share|improve this answer
























          0












          0








          0






          The accepted answer won't work if one needs to put someone else's public key to multiple machines. So, I've come up with the following solution:



          cat add-vassal-tc-agents.sh



          #!/bin/bash
          
set -x # enable bash debug mode
          
if [ -s vassal-public-key.pub ]; then # if file exists and not empty
          
    for ip in `cat tc-agents-list.txt`; do # for each line from the file
          
        # add EOL to the end of the file and echo it into ssh, where it is added to the authorized_keys
          
        sed -e '$s/$/n/' -s vassal-public-key.pub | ssh $ip 'cat >> ~/.ssh/authorized_keys'
          
    done
          
else
          
    echo "Put new vassal public key into ./vassal-public-key.pub to add it to tc-agents-list.txt hosts"
          
fi


          This script adds the new key to the users on the list of machines, provided that the environment it is run on has the access.



          Example of tc-agents-list.txt:



          root@10.10.0.1
          
root@10.10.0.2
          
root@10.10.0.3
          
root@10.10.0.4





          share|improve this answer












          The accepted answer won't work if one needs to put someone else's public key to multiple machines. So, I've come up with the following solution:



          cat add-vassal-tc-agents.sh



          #!/bin/bash
          
set -x # enable bash debug mode
          
if [ -s vassal-public-key.pub ]; then # if file exists and not empty
          
    for ip in `cat tc-agents-list.txt`; do # for each line from the file
          
        # add EOL to the end of the file and echo it into ssh, where it is added to the authorized_keys
          
        sed -e '$s/$/n/' -s vassal-public-key.pub | ssh $ip 'cat >> ~/.ssh/authorized_keys'
          
    done
          
else
          
    echo "Put new vassal public key into ./vassal-public-key.pub to add it to tc-agents-list.txt hosts"
          
fi


          This script adds the new key to the users on the list of machines, provided that the environment it is run on has the access.



          Example of tc-agents-list.txt:



          root@10.10.0.1
          
root@10.10.0.2
          
root@10.10.0.3
          
root@10.10.0.4






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jul 27 at 11:55









          Ilya Sheershoff

          614




          614























              0














              Here is my simple script to copy ssh-keygen to multiple servers without asking password everytime.



              for server in `cat server.txt`;  
              
do  
              
    sshpass -p "password" ssh-copy-id -i ~/.ssh/id_rsa.pub user@$server  
              
done





              share|improve this answer




























                0














                Here is my simple script to copy ssh-keygen to multiple servers without asking password everytime.



                for server in `cat server.txt`;  
                
do  
                
    sshpass -p "password" ssh-copy-id -i ~/.ssh/id_rsa.pub user@$server  
                
done





                share|improve this answer


























                  0












                  0








                  0






                  Here is my simple script to copy ssh-keygen to multiple servers without asking password everytime.



                  for server in `cat server.txt`;  
                  
do  
                  
    sshpass -p "password" ssh-copy-id -i ~/.ssh/id_rsa.pub user@$server  
                  
done





                  share|improve this answer














                  Here is my simple script to copy ssh-keygen to multiple servers without asking password everytime.



                  for server in `cat server.txt`;  
                  
do  
                  
    sshpass -p "password" ssh-copy-id -i ~/.ssh/id_rsa.pub user@$server  
                  
done






                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited Dec 16 at 10:11









                  Thomas

                  3,69161225




                  3,69161225










                  answered Dec 16 at 9:10









                  Rajesh Kumar

                  1




                  1






























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