pypsh - cli for parallel ssh command execution on all known hosts that match a
pypsh is a simple commandline tool to execute a command in parallel on multiple hosts.
Under the hoods it uses ssh via the paramiko python library.
Why pypsh instead of dsh?
Because managing group files with dsh is tedious. Pypsh requires no configuration, it just works.
Similar to dsh, pypsh can be used to execute a command on multiple hosts in parallel. In addition it is also possible to copy a file to multiple hosts at once. See below for further usage instructions.
The command or file copy operation will be executed on any host that is in the known_hosts file and matches the given regular expression.
This means in order for pypsh to know about a host it is necessary to connect to it at least once with plain ssh.
To execute a command on a group of hosts matching a given regular expression:
pypsh <hostregex> <cmd-to-execute>
pypsh "role\d+\.customer\.your\.domain" "uptime"
Instead of executing the commands in parallel it is also possible to execute the commands one after another. To do so use:
pypsh "role\d+\.customer\.your\.domain" --interval 0.1 cmd "uptime"
Or to wait between the commands (which might be useful when restarting services like elasticsearch that are part of a cluster):
pypsh "role\d+\.customer\.your\.domain" -i 60 cmd "uptime"
pypsh can also read from stdin. So it is possible to pipe command into it:
echo "uptime" | pypsh "myhosts[0-9]"
Piping is only supported if pypsh itself only received one argument. Therefore it is not possible to couple it with other parameters like interval
Copy file to multiple hosts
To copy a given file to a group of hosts:
pypsh "my\.domains\d+\.com" copy /tmp/here/myfile.txt /tmp/remote/file.txt
pypsh can be installed using pip:
pip install pypsh
To work on pypsh checkout the git repository, create a virtual environment and install the dependencies:
git clone https://github.com/mfussenegger/pypsh.git cd pypsh mkvirtualenv pypsh pip install -r requirements.txt
Sometimes it is useful to point the pypsh command to the local development branch:
pip install --upgrade --force-reinstall --editable .
But usually it is sufficient to invoke it like this:
python pypsh/main.py ...
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