remote kernel problem
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From: Cristobal Navarro on 9 Aug 2010 05:13 hello, i am having problems launching remote kernels. i have a Xeon server (Linux) on which mathematica is installed, and the "math" command works. on my laptop, i have linux too, and on mathematica i add the kernel to be launched on the remote (the server) node. then i try one example: 2+2 i press shift+enter... mathematica asks me to insert the password of the remote node user name.... ok and then i get error message: "The kernel serverKernel failed to connect to the front end. (Error = MLECONNECT). You should try running the kernel connection outside the front end." for debugging purposes, i made a kernel for my same laptop, just like a "Local" kernel but i choose remote and put my ip adress and my useracount of my laptop. i test 2+2, it asks my password..ok, then the same message: "The kernel self failed to connect to the front end. (Error = MLECONNECT). You should try running the kernel connection outside the front end." this is really weird. the parameters of the "self kernel" are this: `java` -jar `mathssh` fcluster(a)agua math -mathlink -LinkMode Connect - LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` if remote kernel does not work with my same computer, i better not keep trying with the server yet. any help is welcome, i really dont know what is going on. best regards Cristobal.
From: Nate Dudenhoeffer on 10 Aug 2010 03:56 Cristobal, I had a similar problem setting up remote kernels on Mac OS. In the kernel configuration try putting the complete path to the kernel, instead of simply "math." On Mac OS the path is: /Applications/Mathematica.app/Contents/MacOS/MathKernel Regards, Nate On Mon, Aug 9, 2010 at 4:13 AM, Cristobal Navarro <axischire(a)gmail.com>wrote: > hello, > > i am having problems launching remote kernels. > i have a Xeon server (Linux) on which mathematica is installed, and > the "math" command works. > > on my laptop, i have linux too, and on mathematica i add the kernel to > be launched on the remote (the server) node. > then i try one example: > 2+2 > > i press shift+enter... mathematica asks me to insert the password of > the remote node user name.... ok and then i get error message: > > "The kernel serverKernel failed to connect to the front end. (Error = > MLECONNECT). You should try running the kernel connection outside the > front end." > > for debugging purposes, i made a kernel for my same laptop, just like > a "Local" kernel but i choose remote and put my ip adress and my > useracount of my laptop. > > i test 2+2, it asks my password..ok, then the same message: > > "The kernel self failed to connect to the front end. (Error = > MLECONNECT). You should try running the kernel connection outside the > front end." > > this is really weird. > > the parameters of the "self kernel" are this: > `java` -jar `mathssh` fcluster(a)agua math -mathlink -LinkMode Connect - > LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` > > if remote kernel does not work with my same computer, i better not > keep trying with the server yet. > > any help is welcome, i really dont know what is going on. > > best regards > Cristobal. > >
From: Cristobal Navarro on 10 Aug 2010 03:56 i tested what you suggested Nate, instead of just puting "math" in the argument. i put complete path /usr/local/bin/math but i get the same error when testing a 2+2 example. if this is useful: the arguments of MLOpen: -LinkMode Listen -LinkProtocol TCPIP -LinkOptions MLDontInteract the arguments of shell command to launch kernel `java` -jar `mathssh` fcluster(a)agua /usr/local/bin/math -mathlink -LinkMode Connect -LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` fcluster is the account on the remote node which has hostname "agua". my laptop uses another account, from what i know it is not necesary to have the same username on both nodes right? On Mon, Aug 9, 2010 at 5:31 PM, Nate Dudenhoeffer <dudenhoeffer(a)wisc.edu>wrote: > Cristobal, > > I had a similar problem setting up remote kernels on Mac OS. In the kernel > configuration try putting the complete path to the kernel, instead of simply > "math." > > On Mac OS the path is: > /Applications/Mathematica.app/Contents/MacOS/MathKernel > > Regards, > Nate > > On Mon, Aug 9, 2010 at 4:13 AM, Cristobal Navarro <axischire(a)gmail.com>wrote: > >> hello, >> >> i am having problems launching remote kernels. >> i have a Xeon server (Linux) on which mathematica is installed, and >> the "math" command works. >> >> on my laptop, i have linux too, and on mathematica i add the kernel to >> be launched on the remote (the server) node. >> then i try one example: >> 2+2 >> >> i press shift+enter... mathematica asks me to insert the password of >> the remote node user name.... ok and then i get error message: >> >> "The kernel serverKernel failed to connect to the front end. (Error = >> MLECONNECT). You should try running the kernel connection outside the >> front end." >> >> for debugging purposes, i made a kernel for my same laptop, just like >> a "Local" kernel but i choose remote and put my ip adress and my >> useracount of my laptop. >> >> i test 2+2, it asks my password..ok, then the same message: >> >> "The kernel self failed to connect to the front end. (Error = >> MLECONNECT). You should try running the kernel connection outside the >> front end." >> >> this is really weird. >> >> the parameters of the "self kernel" are this: >> `java` -jar `mathssh` fcluster(a)agua math -mathlink -LinkMode Connect - >> LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` >> >> if remote kernel does not work with my same computer, i better not >> keep trying with the server yet. >> >> any help is welcome, i really dont know what is going on. >> >> best regards >> Cristobal. >> >> >> >
From: Nate Dudenhoeffer on 10 Aug 2010 03:56 My launch command looks the same with the exception that instead of having the host name I have the IP address including the port (22). That wouldn't be practical if you have a dynamic IP, but you could use the current IP to see if that's where the issue is. I also use a ssh key pair without a password, but that shouldn't make any difference. Nate On Mon, Aug 9, 2010 at 6:29 PM, Cristobal Navarro <axischire(a)gmail.com>wrote: > i tested what you suggested Nate, > > instead of just puting "math" in the argument. > i put complete path > > /usr/local/bin/math > > but i get the same error when testing a 2+2 example. > > if this is useful: > the arguments of MLOpen: > -LinkMode Listen > -LinkProtocol TCPIP > -LinkOptions MLDontInteract > > the arguments of shell command to launch kernel > `java` -jar `mathssh` fcluster(a)agua /usr/local/bin/math -mathlink > -LinkMode Connect -LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost > `ipaddress` > > fcluster is the account on the remote node which has hostname "agua". > my laptop uses another account, from what i know it is not necesary to have > the same username on both nodes right? > > On Mon, Aug 9, 2010 at 5:31 PM, Nate Dudenhoeffer <dudenhoeffer(a)wisc.edu>wrote: > >> Cristobal, >> >> I had a similar problem setting up remote kernels on Mac OS. In the >> kernel configuration try putting the complete path to the kernel, instead of >> simply "math." >> >> On Mac OS the path is: >> /Applications/Mathematica.app/Contents/MacOS/MathKernel >> >> Regards, >> Nate >> >> On Mon, Aug 9, 2010 at 4:13 AM, Cristobal Navarro <axischire(a)gmail.com>wrote: >> >>> hello, >>> >>> i am having problems launching remote kernels. >>> i have a Xeon server (Linux) on which mathematica is installed, and >>> the "math" command works. >>> >>> on my laptop, i have linux too, and on mathematica i add the kernel to >>> be launched on the remote (the server) node. >>> then i try one example: >>> 2+2 >>> >>> i press shift+enter... mathematica asks me to insert the password of >>> the remote node user name.... ok and then i get error message: >>> >>> "The kernel serverKernel failed to connect to the front end. (Error = >>> MLECONNECT). You should try running the kernel connection outside the >>> front end." >>> >>> for debugging purposes, i made a kernel for my same laptop, just like >>> a "Local" kernel but i choose remote and put my ip adress and my >>> useracount of my laptop. >>> >>> i test 2+2, it asks my password..ok, then the same message: >>> >>> "The kernel self failed to connect to the front end. (Error = >>> MLECONNECT). You should try running the kernel connection outside the >>> front end." >>> >>> this is really weird. >>> >>> the parameters of the "self kernel" are this: >>> `java` -jar `mathssh` fcluster(a)agua math -mathlink -LinkMode Connect - >>> LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` >>> >>> if remote kernel does not work with my same computer, i better not >>> keep trying with the server yet. >>> >>> any help is welcome, i really dont know what is going on. >>> >>> best regards >>> Cristobal. >>> >>> >>> >> >
From: Cristobal Navarro on 10 Aug 2010 03:57
i also tried and it didnt work. all i know is that ssh is not the problem because i always everyday with it on the remote node. could you copy to me your arguments ?? thanks! On Mon, Aug 9, 2010 at 7:36 PM, Nate Dudenhoeffer <dudenhoeffer(a)wisc.edu>wrote: > My launch command looks the same with the exception that instead of having > the host name I have the IP address including the port (22). That wouldn't > be practical if you have a dynamic IP, but you could use the current IP to > see if that's where the issue is. > > I also use a ssh key pair without a password, but that shouldn't make any > difference. > > Nate > > > On Mon, Aug 9, 2010 at 6:29 PM, Cristobal Navarro <axischire(a)gmail.com>wrote: > >> i tested what you suggested Nate, >> >> instead of just puting "math" in the argument. >> i put complete path >> >> /usr/local/bin/math >> >> but i get the same error when testing a 2+2 example. >> >> if this is useful: >> the arguments of MLOpen: >> -LinkMode Listen >> -LinkProtocol TCPIP >> -LinkOptions MLDontInteract >> >> the arguments of shell command to launch kernel >> `java` -jar `mathssh` fcluster(a)agua /usr/local/bin/math -mathlink >> -LinkMode Connect -LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost >> `ipaddress` >> >> fcluster is the account on the remote node which has hostname "agua". >> my laptop uses another account, from what i know it is not necesary to >> have the same username on both nodes right? >> >> On Mon, Aug 9, 2010 at 5:31 PM, Nate Dudenhoeffer <dudenhoeffer(a)wisc.edu>wrote: >> >>> Cristobal, >>> >>> I had a similar problem setting up remote kernels on Mac OS. In the >>> kernel configuration try putting the complete path to the kernel, instead of >>> simply "math." >>> >>> On Mac OS the path is: >>> /Applications/Mathematica.app/Contents/MacOS/MathKernel >>> >>> Regards, >>> Nate >>> >>> On Mon, Aug 9, 2010 at 4:13 AM, Cristobal Navarro <axischire(a)gmail.com>wrote: >>> >>>> hello, >>>> >>>> i am having problems launching remote kernels. >>>> i have a Xeon server (Linux) on which mathematica is installed, and >>>> the "math" command works. >>>> >>>> on my laptop, i have linux too, and on mathematica i add the kernel to >>>> be launched on the remote (the server) node. >>>> then i try one example: >>>> 2+2 >>>> >>>> i press shift+enter... mathematica asks me to insert the password of >>>> the remote node user name.... ok and then i get error message: >>>> >>>> "The kernel serverKernel failed to connect to the front end. (Error = >>>> MLECONNECT). You should try running the kernel connection outside the >>>> front end." >>>> >>>> for debugging purposes, i made a kernel for my same laptop, just like >>>> a "Local" kernel but i choose remote and put my ip adress and my >>>> useracount of my laptop. >>>> >>>> i test 2+2, it asks my password..ok, then the same message: >>>> >>>> "The kernel self failed to connect to the front end. (Error = >>>> MLECONNECT). You should try running the kernel connection outside the >>>> front end." >>>> >>>> this is really weird. >>>> >>>> the parameters of the "self kernel" are this: >>>> `java` -jar `mathssh` fcluster(a)agua math -mathlink -LinkMode Connect - >>>> LinkProtocol TCPIP -LinkName "`linkname`" -LinkHost `ipaddress` >>>> >>>> if remote kernel does not work with my same computer, i better not >>>> keep trying with the server yet. >>>> >>>> any help is welcome, i really dont know what is going on. >>>> >>>> best regards >>>> Cristobal. >>>> >>>> >>>> >>> >> > |