[capistrano-mailing-list] Trying to write a task to distribute files from a remote server to a group of other remote servers

2015-06-01 Thread Steve Wechsler
Versions:

   - Ruby 1.8.7
   - Capistrano v2.5.5
   - Rake / Rails / etc

Platform:

   - CentOS/Red Hat


I'm trying to write a task (to be called from a Perl script) that will work 
on any Linux host in my environment. However, since there is only one host 
that can SSH to every other host (it can also receive SSH connections from 
any host), and I can't guarantee that the task will be running on that 
host, I need to find a way to run the task on that host.

Here's what I came up with so far:


set :user, usr

cmd = getpass  + user
set :password, `#{cmd}`

task :distribute, :on_error = :continue do
  host_list = hosts.split(',')
  servers = []
  host_list.each do |n|
servers.push([n])
  end
  filelist=files.split(',')
  filelist.each do |f|
upload f, target_dir, { :via = :scp, :hosts = servers, :on_error = 
:continue  }
  end
end

to be invoked like this:

/usr/bin/cap -f distribute_file.rb -S usr=user_to_run_as -s 
target_dir=/path/to/target -s files=/path/to/source_file -s hosts=(list of 
hosts) HOST=master_host

but that caused it to only run against master_host

So then I tried executing it with SSH, but that had a tendency to hang, 
plus it seemed to me like there should be a built-in method for this.

I'm a Perl guy and am new to both Ruby and capistrano, so please be gentle 
:)

Thanks.

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Re: [capistrano-mailing-list] Trying to write a task to distribute files from a remote server to a group of other remote servers

2015-06-01 Thread Lee Hambley
I'd drop Capistrano and use SSHKit, the underlying driver in Capistrano v3
(your example is v2) - see
https://github.com/capistrano/sshkit/blob/master/EXAMPLES.md#upload-a-file-from-disk
and
https://github.com/capistrano/sshkit/blob/master/EXAMPLES.md#using-with-rake

Combine those two to recreate what you have above, and mix in some
https://github.com/capistrano/sshkit#tunneling-and-other-related-ssh-themes
to make sure that you can reach the hosts as you need to, and I think
you'll be fine.

SSH is probably hanging because your process is hanging onto some
resources, that can often be solved by tunneling and/or remotely starting
thigns with `ssh me@thehost 'thecommand'`, for example. Hard to say without
more info.

But, I'd absolutely avoid using Cap v2 if you're starting out, it's more
than two years since EOL, but very widely documented/blogged about in the
net.

Lee Hambley
http://lee.hambley.name/
+49 (0) 170 298 5667

On 1 June 2015 at 21:07, Steve Wechsler swechs...@gmail.com wrote:

 Versions:

- Ruby 1.8.7
- Capistrano v2.5.5
- Rake / Rails / etc

 Platform:

- CentOS/Red Hat


 I'm trying to write a task (to be called from a Perl script) that will
 work on any Linux host in my environment. However, since there is only one
 host that can SSH to every other host (it can also receive SSH connections
 from any host), and I can't guarantee that the task will be running on that
 host, I need to find a way to run the task on that host.

 Here's what I came up with so far:


 set :user, usr

 cmd = getpass  + user
 set :password, `#{cmd}`

 task :distribute, :on_error = :continue do
   host_list = hosts.split(',')
   servers = []
   host_list.each do |n|
 servers.push([n])
   end
   filelist=files.split(',')
   filelist.each do |f|
 upload f, target_dir, { :via = :scp, :hosts = servers, :on_error =
 :continue  }
   end
 end

 to be invoked like this:

 /usr/bin/cap -f distribute_file.rb -S usr=user_to_run_as -s
 target_dir=/path/to/target -s files=/path/to/source_file -s hosts=(list of
 hosts) HOST=master_host

 but that caused it to only run against master_host

 So then I tried executing it with SSH, but that had a tendency to hang,
 plus it seemed to me like there should be a built-in method for this.

 I'm a Perl guy and am new to both Ruby and capistrano, so please be gentle
 :)

 Thanks.

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