On 03/04/2017 06:41 AM, bruce wrote: > Ok guys, > > I know this isn't strictly "Fed" related, but the group might have suggestions. > > My use case, the process has a number of remote servers. I'd like to > be able to run a bunch of commands on the remote servers as fast as > posible. The initial thought was to loop through the different > IPAddresses, and SSH into each server, to run the commands. > > However, this process was still "sequential" in that each SSH session > needs to complete, prior to running the next server/ssh command. > > So, my question/need -- is to figure out how to run a ssh as a > background on the local server. This approach would/should allow the > process to quickly fire off commands to the remote ipaddresses/servers > in a much faster/parallel manner. > > sortof: > > foreach iplist as ipaddress > > ssh user1@ipaddress command & (assuming that the '&' runs the local > ssh in the background -- it doesn't!) > > > Running "stuff" on the remote can occur in a "Screen" session, which > would allow the ssh process to fire off the remote cmd, but it still > doesn't run the local ssh as a "background" process.. > > Rick has mentioned/discussed the "Screen" function in past threads. Yes, screen is useful. Have a look a the "pdsh" command and its companion, "dshbak". I use it a lot to manage our storage systems. For example, each of the machines involved has an "/etc/machines" file of: seg1-r0 seg2-r0 seg3-r0 seg4-r0 seg5-r0 seg6-r0 They also all have shared ssh keys. If I use the command: pdsh -a "ps ax" | dshbak on one of them, they all will do a "ps ax" command asynchronously and dshbak will sort the output so that the output of each machine is kept together. Similarly, pdsh -w seg[1,2]-r0 "ps ax" | grep dshbak will only run the command on the first two machines. You get the idea. ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx - - AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 - - - - Tempt not the dragons of fate, since thou art crunchy and taste - - good with ketchup. - ---------------------------------------------------------------------- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
