So I am attempting to reduce the downtime of our deployments, in one such
case I umount all database related mount points so I can take a snapshot on
the SAN (this is all automated via capistrano using SAN APIs etc..) it
would be nice if I could have one cap job which ran all 20 commands at
exactly the same time, if that cap command failed I can deal with that in a
paret script which controles the remounting of file systems etc... To me
that is what "in parallel means" all the "run" tasks run at the same time.
Brian
On Sat, Nov 5, 2011 at 4:56 PM, Donovan Bray <donno...@gmail.com> wrote:
> What difference does it make?
>
> Commands runs serially in order specified, whether you do it via multiple
> command passed to the shell or not. Each command is sent in parallel via
> ssh to all servers specified.
>
> What exactly do you mean in parallel?
>
> On Nov 5, 2011, at 12:33 PM, Brian Carpio <bcar...@thetek.net> wrote:
>
> I guess I don't want this to be a shell issue, these tasks
> aren't dependent on one another so I was hoping capistrano could run them
> all at the same time. What if I separate out each run " command " to its
> own cap task then can I run cap tasks in parellel?
>
> Thanks,
> Brian
>
> On Sat, Nov 5, 2011 at 11:07 AM, Donovan Bray < <donno...@gmail.com>
> donno...@gmail.com> wrote:
>
>> You can do anything that your shell can do.
>>
>> You have to first determine how you want the commands to exit in case one
>> command fails.
>>
>> run "a;b;c"
>>
>> In this case all commands will run regardless of exit code, the exit code
>> of the last command only will be returned to cap.
>>
>> run "a && b && c"
>>
>> Will run each command but will exit on the first failure
>>
>> run "cd /a && b; true"
>>
>> Will exit and not run b if it can't cd into a;
>> If it can cd into a then it will run b; but it will always report sucess
>> to cap; even if b fails.
>>
>> Fair warning sudo doesn't allow you to chain execution this way
>>
>> sudo "cd /a && b; true"
>>
>> Won't work as expected; but you could rewrite it as a run.
>>
>> run "cd /a && #{sudo} b; true"
>>
>> On Nov 5, 2011, at 5:22 AM, Brian Carpio < <bcar...@thetek.net>
>> bcar...@thetek.net> wrote:
>>
>> > Lets say I have the following
>> >
>> >
>> > desc "my task"
>> > task :my_task, :roles => :cluster do
>> > run "some command here"
>> > run "some command here"
>> > run "some command here"
>> > run "some command here"
>> > run "some command here"
>> > run "some command here"
>> > run "some command here"
>> > end
>> >
>> > When I call my_task each command runs one after the other, is there a
>> > way to make Capistrano run them all at once instead of waiting for the
>> > first one to finish then move to the next one?
>> >
>> > Thanks,
>> > Brian
>> >
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