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If I have multiple tasks defined in my playbook, does ansible creates a separate ssh connection for each of the tasks. If yes, is that not a performance issue.
Because whenever I do a verbose o/p while i run the playbook, against each task i spot this.
"ESTABLISH SSH CONNECTION FOR USER: gparasha"
Am i wrong in my understanding.
By default, Ansible creates a new connection for each task. It takes advantage of SSH connection multiplexing to significantly reduce the amount of time required to establish a new connection.
If you enable the pipelining feature, then in many cases Ansible will be able to re-use a single ssh connection for multiple tasks (although in some cases it will still need to spawn a new connection).
To enable pipelining, you need the following in your ansible.cfg:
[ssh_connection]
pipelining = True
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Closed 1 year ago.
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I am using the HexChat client on my local machine. I have been using an unregistered nick, eg. foobar. When my connection has dropped I get a message when I try to reconnect:
foobar is already in use. Retrying with foobar01...
foobar01 is already in use. Retrying with foobar02...
This has been like this for weeks. My actual username I am trying to use is not something anyone wold be using so it seems it is locked. Obviously I cannot register the nick because I can't connect with it.
What's the solution?
If you are saying it is happening only temporarily after disconnecting that is often referred to as a ghost and your old connection just hasn't timed out. If you register the nick you can forcefully disconnect it otherwise you wait.
If it is always happening and another user is actually using it /whois $thenick then there is nothing you can do about that since you didn't register it.
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How can I check if a username exists at a ssh server address using command line tools? For example, I would love to type,
isvaliduser [username] [ssh_server]
result: True
where isvaliduser is some magical function that tests whether a user with name username exists at ssh_server. But is this feasible?
My specific application: The remote server I need to access has a dynamic IP (I can't use a Dynamic DNS service). I can come up with a list of server addresses that contains my target address, but I need a way to figure out which one is mine. I thought one way of doing this would be to test if any of the addresses have the user myusername. But if you have another suggestion for solving my particular problem, I would be happy to hear it.
You have to connect to that server and check if the user is in the passwd for example:
ssh your_account_at_serve#[ssh_server] grep [username] /etc/passwd
If you would be able to enumerate users without authentication, it is considered as a information disclosure and security threat.
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I want to create an AS2 connection with my customer by using SAP PI tool. But PI is in internal network. We also have a DMZ machine. How can I make the AS2 connection between each other ?
Thanks
We have a similar integration.
We use Run Operation System command After message Processing, under the processing tab in communication channel (file).
Basicaly: write the file on the internal network with the file communicaiton channel that then launch a SH (or BAT) script launching the AS2 transfert to the outside.
Hope it can help. We have multiple integrations using this on i5/OS and Windows.
Regards,
M
Edit: added the proper CC's option name
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Closed 8 years ago.
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Rsync took over 10 hours today to transfer a 1GB file over the internet (from one Raspberry Pi to another. Are there any ways to speed this up?
rsync uses ssh to transfer files. Therefore what you want to do is speed up ssh. You can do that by changing the encryption method to a faster one such as arcfour or blowfish. You can do this by using the -e flag. For example
rsync -avt -e "ssh -c blowfish" user#dest:/remote/path /local/path
Personally I use blowfish but here is a benchmark I found real quick. Keep in mind this isn't going to make rsync super fast all of a sudden, but it could help if the bottleneck is the CPU on either side which is likely with embedded machines. Also keep in mind that your build of ssh might not have all the ciphers you see used elsewhere.
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I am using scp to download millions of small files (100 - 1000 kb) files from my EC2 instances. scp seems to transfer one file at a time and does not utilize fully my 1 gbps connection.
Is there a more efficient way to download the files? For various technical reasons, achieving and downloading is not an option.
Take a look at rsync. It can also work through ssh.
If you are still able to use tar, but not able to create a tarball on the remote host, you can try something like:
ssh ec2instance "tar c /path/to/source" | tar x -C /path/to/destination
You can use the v option to tar, or the pipe viewer to get feedback on the transfer.
If the above is not an option either, try running several (a dozen) scp in parallel to reduce the effect of the overhead induced by many small files.
(Also make sure that the filesystem is not the bottleneck.)