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I have this error when using scp:
scp -r h1:/dir1 h2:/dir1
ssh: Could not resolve hostname online1: Name or service not known
lost connection
But both ssh h1 and ssh h2 works well for I have config name alias in .ssh/config like this:
Host h1
HostName 172.16.18.xxx
User xxx
No editing on /etc/hosts. And I also use ssh-copy-id to work out the public key. Any idea of what's wrong?
When you use scp with no additional options like you here, remote h1 tries to directly connect to h2.
h1 -> h2
Since h1 need to know who h2 is, h1 needs the definition of h2. But you could also route it over your PC like
h1 -> your pc -> h2
using the option -3
scp -r -3 h1:/dir1 h2:/dir2
this will help when 'myserver' is used as alias in ssh config file
sudo scp -F ~/.ssh/config -i ~/.ssh/id_rsa some_local_file.zip myserver:some_remote_folder/
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The following command gives the expected result (file is created):
sshpass -p pas ssh root#host 'touch foo'
But the following one does nothing on the remote host:
sudo sshpass -p pas ssh root#host 'touch foo'
The only difference here is just sudo mode.
What is the reason here? And how this can be solved?
The problem is more visible when running ssh -v.
With sudo communication interrupts after detecting the server host key.
To solve the problem ssh needs to run with the following argument -o "StrictHostKeyChecking no".
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Closed 7 years ago.
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How do I copy a file using ssh from my test server to my production server, how do I do this for a single file and how do I do this for multiple files?
From Window to Linux
Download https://cygwin.com/ this will give you a proper terminal which will then allow you to run the linux commands as listed below in the From Linux to Linux section.
From Linux to Linux
The essential command is this
The command
scp [ssh login to remote server]:[filepath] [local filepath]
To copy a single file example
scp user#your.server.example.com:/path/to/foo/[filename] /home/user/Desktop/[filename]
To copy a directory example
scp -r user#your.server.example.com:/path/to/foo /home/user/Desktop/
To use full power of scp you need to go through next steps:
Setup public key authentication
Create ssh aliases
Then, for example if you'll have this ~/.ssh/config:
Host test
User testuser
HostName test-site.com
Port 22022
Host prod
User produser
HostName production-site.com
Port 22022
you'll save yourself from password entry and simplify scp syntax like this:
scp -r prod:/path/foo /home/user/Desktop # copy to local
scp -r prod:/path/foo test:/tmp # copy from remote prod to remote test
More over, you will be able to use remote path-completion:
scp test:/var/log/ # press tab twice
Display all 151 possibilities? (y or n)
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Closed 8 years ago.
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How do you check if a port is open when you cannot use telnet or install Cacti? I want to see if a port is open between two Linux servers. Telnet isn't installed. I tried this command:
cat < /dev/tcp/x.x.x.x/6061
where x.x.x.x was the remote IP address of the Linux server and port 6061 is the port that I want to test. But based on tests of known working and not working ports, this command wasn't conclusive to me. There may be an environmental explanation for that.
Install nmap and than:
nmap x.x.x.x
Better use (if installed) : netcat :
nc -zw3 <host> <port>
If you want to use the bash feature net redirection :
cat < /dev/tcp/x.x.x.x/6061
do it the right way :
{ exec 3<> /dev/tcp/127.0.0.1/6061; } &>/dev/null &&
echo "Connection to socket OK" ||
echo >&2 "Can't connect"
If it doesn't work, you need to compile bash with --enable-net-redirections
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Closed 9 years ago.
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when running
gcutil ssh myproject_name
ssh run with the following command
ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o StrictHostKeyChecking=no -i /Users/MyUser/.ssh/google_compute_engine -A -p 22 MyUser#xxx.xxx.xxx.xxx
i've changed my ssh port to 1234 in sshd_config file and opened a firewall rule at my compute engine console. executing the following command works perfect and connection is established
ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o StrictHostKeyChecking=no -i /Users/MyUser/.ssh/google_compute_engine -A -p 1234 MyUser#xxx.xxx.xxx.xxx
but when running this command gcutil ssh myproject_name port 22 is being called.
How & where can i change the default port of ssh so I wont have to use the long command in order to connect to my instance
gcutil supports alternate ports via the --ssh_port flag. In your case, this should work:
gcutil ssh --ssh_port 1234 INSTANCE_NAME
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Closed 9 years ago.
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I am having multiple ssh commands to do some tasks for me. For eg:
ssh a-vm "rm -f /home/dir/file1.xlsx"
ssh a-vm "rm -f /home/dir/file2.xml"
scp me#b-vm:/somedir/file1.xlsx .
scp me#b-vm:/somedir/file2.xml .
1) Is there a way to combine 2 ssh commands into 1 and two scp commands into 1?
2) Is there a cost if I do ssh and scp multiple times instead of 1 time?
Any help is appreciated.
You can just do:
ssh a-vm "rm -f /home/dir/file1.xlsx ; rm -f /home/dir/file2.xml"
scp "me#b-vm:/somedir/{file1.xlsx,file2.xml}" .
Each ssh/scp call will cost you the connection time and some cpu time (could be significant if you do that to hundreds of machines at the same time, otherwise unlikely).
Alternatively you can use a persistent master connection for ssh and tunnel others over it. That will save a couple of network roundtrips - see http://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing