Omnitool is a tool for using SSH on multiple machines in parallel. It is particularly useful for times when you need a bunch of machines for a short period of time but don't want to invest the time in building up a more robust management system.
Omnitool's goal is to let you think in terms of one machine while working with N machines.
$ go get github.com/jmsdnns/omnitool
$ go install github.com/jmsdnns/omnitoolOmnitool has help built-in.
Usage:
omnitool [command]
Available Commands:
copy Copies file to host group
run Runs a command on host group
Flags:
-g, --group string host group for task
-h, --help help for omnitool
--hostsfile string path to hosts file (default "hosts.list")
-k, --keyfile string path to ssh key
-u, --username string username for ssh
Use "omnitool [command] --help" for more information about a command.Running a command on a host group looks like this:
$ ./omnitool -u ... -k ... -g ... run "ls -l"
CMD: ls -l
Host: 33.33.33.12:22
Result:
total 0
-rw-rw-r-- 1 vagrant vagrant 0 Aug 14 02:53 machine_2
Host: 33.33.33.11:22
Result:
total 0
-rw-rw-r-- 1 vagrant vagrant 0 Aug 14 02:53 machine_1Copying a file to a host group looks like this:
$ ./omnitool -u ... -k ... -g ... copy hosts.list hosts.list
Host: 33.33.33.12:22
Result: ok
Host: 33.33.33.11:22
Result: okA hosts file looks like this:
[vagrants]
127.0.0.1:2222
127.0.0.1:2200
[jms labs]
192.168.0.5:22
192.168.0.6:22
Using Omnitool with Vagrant is easy, but you will need to tell Vagrant not to automatically generate SSH keys for each host. This lets us use a single key for each host, which more accurately reflects what you'd have in AWS anyway.
For more info, read about the config.ssh.insert_key flag in Vagrant's SSH documentation.
| Flag | Default value |
|---|---|
-u |
vagrant |
-k |
$HOME/.vagrant.d/insecure_private_key |