You have 20 hosts you want the same command run OR 20 different commands on the same host?
If it's the former use roles and define all the servers then target the task to that role; if it's the latter then your going to need to push down a bash script that forks subshells; On Nov 8, 2011, at 11:10 AM, Brian Carpio <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 >> > >> > -- >> > * You received this message because you are subscribed to the Google >> > Groups "Capistrano" group. >> > * To post to this group, send email to [email protected] >> > * To unsubscribe from this group, send email to >> > [email protected] For more options, visit this group >> > at http://groups.google.com/group/capistrano?hl=en >> >> -- >> * You received this message because you are subscribed to the Google Groups >> "Capistrano" group. >> * To post to this group, send email to [email protected] >> * To unsubscribe from this group, send email to >> [email protected] For more options, visit this group >> at http://groups.google.com/group/capistrano?hl=en >> >> -- >> * You received this message because you are subscribed to the Google Groups >> "Capistrano" group. >> * To post to this group, send email to [email protected] >> * To unsubscribe from this group, send email to >> [email protected] For more options, visit this group >> at http://groups.google.com/group/capistrano?hl=en > > -- > * You received this message because you are subscribed to the Google Groups > "Capistrano" group. > * To post to this group, send email to [email protected] > * To unsubscribe from this group, send email to > [email protected] For more options, visit this group at > http://groups.google.com/group/capistrano?hl=en > > -- > * You received this message because you are subscribed to the Google Groups > "Capistrano" group. > * To post to this group, send email to [email protected] > * To unsubscribe from this group, send email to > [email protected] For more options, visit this group at > http://groups.google.com/group/capistrano?hl=en -- * You received this message because you are subscribed to the Google Groups "Capistrano" group. * To post to this group, send email to [email protected] * To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/capistrano?hl=en
