I have two nodes (master and slave) where the home directory of the master is shared via NFS with the slave node. I have created an ssh key and used 'ssh-copy-id' to add the public key to 'authorized_keys'.
The passwordless ssh works from the slave to the master, but not from the master to slave as I get "agent admitted failure to signing using key".
I think it may be an issue with file permissions but it is tricky since ~/.ssh folder is shared using NFS. Any ideas?
I have 2 PCs running Ubuntu 12.04 Desktop version connected via 1 Gigabit Ethernet switch. I would like to create a 2 node cluster and configure Torque to submit and schedule jobs on the two nodes.
Please note that I am not interested in running MPI type jobs across the nodes. My calculations would be run on one node at at time, but rather than wait and manually submit a new job when a job is finished, I would like to submit multiple jobs using qsub and have them queued until a node is freed up.
I guess my question could be divided into two parts
a) What is the best cluster setup for the system I have described in the above?
b) How do I setup Torque after setting up the cluster. Please note that I have already installed Torque on each machine.
Thanks in advance
Can someone please tell me what sudo echo nameserver 8.8.8.8 > /etc/resolv.conf does?
I used to have random dropping of internet connection for 15 seconds to 3 mins but after using this command, internet connection is working like a charm. I am just curious what this magic command line did.
Ever since I have installed 12.04 (clean install not an upgrade), I have been having a drop in the Internet connection. The drop in the connection can be anything from 15 seconds to about 3 mins, and then the connection comes back. This behaviour happens while I am actively browsing the Internet, or if I wake up the computer and open Firefox (sometimes I have connection and sometimes I don't) . Please note that when the Internet connection is on, it is not slow (as speedtest.net results show).
In the beginning, I thought it was a problem with the driver r8169 for my RTL8111/8168B Ethernet card, so I downloaded the r8168 from Realtek website, followed the detailed instructions (blacklisted r8169, changed the file to .bsh ...), but still the same problem persisted.
So I switched to a wireless connection, and I got the same problem with Internet connection dropping randomly.
Any ideas? Thanks in advance.
Output from lspci -v:
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: f8000000-fa0fffff
Prefetchable memory behind bridge: 00000000d0000000-00000000dbffffff
Capabilities: [88] Subsystem: Dell Device 04a7
Capabilities: [80] Power Management version 3
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [a0] Express Root Port (Slot+), MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [140] Root Complex Link
Kernel driver in use: pcieport
Kernel modules: shpchp
00:01.1 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: f4000000-f60fffff
Prefetchable memory behind bridge: 00000000c0000000-00000000cbffffff
Capabilities: [88] Subsystem: Dell Device 04a7
Capabilities: [80] Power Management version 3
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [a0] Express Root Port (Slot+), MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [140] Root Complex Link
Kernel driver in use: pcieport
Kernel modules: shpchp
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 52
Memory at f6108000 (64-bit, non-prefetchable) [size=16]
Capabilities: [50] Power Management version 3
Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+
Kernel driver in use: mei
Kernel modules: mei
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05) (prog-if 20 [EHCI])
Subsystem: Dell Device 04a7
Flags: bus master, medium devsel, latency 0, IRQ 16
Memory at f6107000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 53
Memory at f6100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [130] Root Complex Link
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
Memory behind bridge: fa400000-fa4fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Dell Device 04a7
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
I/O behind bridge: 0000c000-0000cfff
Prefetchable memory behind bridge: 00000000dc100000-00000000dc1fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Dell Device 04a7
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
I/O behind bridge: 0000b000-0000bfff
Memory behind bridge: fa300000-fa3fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Dell Device 04a7
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=06, subordinate=06, sec-latency=0
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: fa200000-fa2fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Dell Device 04a7
Capabilities: [a0] Power Management version 2
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) (prog-if 20 [EHCI])
Subsystem: Dell Device 04a7
Flags: bus master, medium devsel, latency 0, IRQ 23
Memory at f6106000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1f.0 ISA bridge: Intel Corporation P67 Express Chipset Family LPC Controller (rev 05)
Subsystem: Dell Device 04a7
Flags: bus master, medium devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
Kernel modules: iTCO_wdt
00:1f.2 RAID bus controller: Intel Corporation 82801 SATA Controller [RAID mode] (rev 05)
Subsystem: Dell Device 04a7
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 42
I/O ports at f070 [size=8]
I/O ports at f060 [size=4]
I/O ports at f050 [size=8]
I/O ports at f040 [size=4]
I/O ports at f020 [size=32]
Memory at f6105000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [70] Power Management version 3
Capabilities: [a8] SATA HBA v1.0
Capabilities: [b0] PCI Advanced Features
Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
Subsystem: Dell Device 04a7
Flags: medium devsel, IRQ 5
Memory at f6104000 (64-bit, non-prefetchable) [size=256]
I/O ports at f000 [size=32]
Kernel modules: i2c-i801
01:00.0 VGA compatible controller: NVIDIA Corporation Device 0dc5 (rev a1) (prog-if 00 [VGA controller])
Subsystem: NVIDIA Corporation Device 085b
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at f8000000 (32-bit, non-prefetchable) [size=16M]
Memory at d0000000 (64-bit, prefetchable) [size=128M]
Memory at d8000000 (64-bit, prefetchable) [size=32M]
I/O ports at e000 [size=128]
Expansion ROM at fa000000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
Kernel driver in use: nouveau
Kernel modules: nouveau, nvidiafb
01:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1)
Subsystem: NVIDIA Corporation Device 085b
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at fa080000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
02:00.0 VGA compatible controller: NVIDIA Corporation Device 0dc5 (rev a1) (prog-if 00 [VGA controller])
Subsystem: NVIDIA Corporation Device 085b
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at f4000000 (32-bit, non-prefetchable) [size=32M]
Memory at c0000000 (64-bit, prefetchable) [size=128M]
Memory at c8000000 (64-bit, prefetchable) [size=64M]
I/O ports at d000 [size=128]
Expansion ROM at f6000000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
Kernel driver in use: nouveau
Kernel modules: nouveau, nvidiafb
02:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1)
Subsystem: NVIDIA Corporation Device 085b
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at f6080000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
03:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30 [XHCI])
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fa400000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [50] Power Management version 3
Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff
Capabilities: [150] Latency Tolerance Reporting
Kernel driver in use: xhci_hcd
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 51
I/O ports at c000 [size=256]
Memory at dc104000 (64-bit, prefetchable) [size=4K]
Memory at dc100000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 03-00-00-00-68-4c-e0-00
Kernel driver in use: r8168
Kernel modules: r8168
05:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series Firewire Controller (rev 01) (prog-if 10 [OHCI])
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at fa300000 (64-bit, non-prefetchable) [size=2K]
I/O ports at b000 [size=256]
Capabilities: [50] Power Management version 3
Capabilities: [80] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [98] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [130] Device Serial Number 00-10-dc-ff-ff-cf-56-1a
Kernel driver in use: firewire_ohci
Kernel modules: firewire-ohci
06:00.0 SATA controller: JMicron Technology Corp. JMB362 SATA Controller (rev 10) (prog-if 01 [AHCI 1.0])
Subsystem: Dell Device 04a7
Flags: bus master, fast devsel, latency 0, IRQ 19
I/O ports at a040 [size=8]
I/O ports at a030 [size=4]
I/O ports at a020 [size=8]
I/O ports at a010 [size=4]
I/O ports at a000 [size=16]
Memory at fa210000 (32-bit, non-prefetchable) [size=512]
Capabilities: [8c] Power Management version 3
Capabilities: [50] Express Legacy Endpoint, MSI 00
Kernel driver in use: ahci
Note that my wireless card is not showing, I have the Ralink 3390 card (which apparently does not show up on Ubuntu for some reason), however I am able to connect to wireless network and connect to the Internet (when it is working).
This just seems like a common problem, however I was not able to find a solution on the net. For some reason Ubuntu doesn't like WPA/WPA2 personal encryption. I can connect to the network fine (others have reported they are not able to connect and the 'Authentication Required Window' keeps on appearing), however I am unable to connect to the internet.
When I change the security settings of the router to 'Open' or to 'WEP' I can connect fine. However 'WEP' slows down the connection by a factor of 2. Several people have suggested to use 'wicd' instead of 'network-manager' I tried that but I got the same problems.
Please note that I have had this problem with Ubuntu 11.10 and now it seems it has carried over to 12.04.
Also note that I dont think it is a problem with the wireless router (Medialink) because my Windows 7 machine, iPad and Android phone all connect fine. Any ideas? Thanks in advance