Gossh

Go library and CLIs for running ssh and scp concurrently over many hosts.

For the CLIs, arguments try to stick as close as possible to their linux versions.

gossh host-[1..100].example.com \
  -n 40 \                         # 40 concurrent ssh sessions at a time
  -l techops \                    # ssh as user techops
  -i /home/techops/.ssh/id_dsa \  # with identity from path
  -o ServerAliveInterval=10 \     # options to pass to ssh
  -o ConnectTimeout=2 \
  -o UserKnownHostsFile=/dev/null \
  -o PreferredAuthentications=publickey \
  -o StrictHostKeyChecking=no \
  date                            # command to run on all hosts

Real example

$ gossh localhost,localhost -o PreferredAuthentications=publickey -l root date
2013/11/21 09:33:00 Hostname: localhost
Stdout: 
Stderr: Permission denied (publickey,keyboard-interactive).

2013/11/21 09:33:00 Hostname: localhost
Stdout: 
Stderr: Permission denied (publickey,keyboard-interactive).

$ gossh localhost,localhost -o PreferredAuthentications=publickey  date
2013/11/21 09:33:04 Hostname: localhost
Stdout: Thu Nov 21 09:33:04 PST 2013

Stderr: 
2013/11/21 09:33:04 Hostname: localhost
Stdout: Thu Nov 21 09:33:04 PST 2013

Stderr: 

goscp host-[1..100].example.com \
  -n 40 \                         # 40 concurrent ssh sessions at a time
  -l techops \                    # ssh as user techops
  -i /home/techops/.ssh/id_dsa \  # with identity from path
  -o ServerAliveInterval=10 \     # options to pass to ssh
  -o ConnectTimeout=2 \
  -o UserKnownHostsFile=/dev/null \
  -o StrictHostKeyChecking=no \
  /etc/hosts                      # local src file to copy over
  /tmp/admins-hosts               # location where to save file on remote hosts

gorsync host-[1..100].example.com \
  -r                              # recursive
  --keep-insync                   # on local file change, sync
  /local/dir
  /remote/dir