ISILON: ¿Cómo ejecutar tcpdump en modo de cumplimiento en varias interfaces en todos los nodos?

Summary: El modo de cumplimiento de normas requiere pequeños cambios en los comandos tcpdump habituales del servicio de soporte.

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Instructions

  1. Cree una carpeta para guardar las capturas de paquetes. 
    1. mkdir -p /ifs/data/tcpdump/$(date +%F)

# Writes to Isilon_Support are protected, use /ifs/data/tcpdump/ instead.
  2. Inicie la captura. 
    1. sudo isi_for_array 'for iface in `ifconfig | grep -B3 ether | grep flags | grep -v ISIINTERNAL | cut -d ":" -f1`; do echo `hostname`; sudo tcpdump -i $iface -s1000 -w /ifs/data/tcpdump/$(date +%F)/`hostname`_"$iface"_$(date +%F_%H%M%S).pcap &; done'

# Press Ctrl+C to return to the shell prompt after all tcpdumps have started.
# See the notes for expected output. (There are a number of errors that don't affect the capture)
  3. Verifique que la captura esté en ejecución. 
    1. sudo isi_for_array "ps -auwwxx | grep tcpdump | grep -v grep"
  4. Reproduzca el problema.
  5. Detenga la captura y verifique que se haya detenido en todos los nodos. 
    1. sudo isi_for_array "sudo killall tcpdump"
sudo isi_for_array "ps -auwwxx | grep tcpdump | grep -v grep"

# See notes for expected output
  6. Cargue las capturas con un conjunto de registros. 
    1. sudo isi_gather_info -f /ifs/data/tcpdump/$(date +%F)

Additional Information

Al ejecutar la captura es posible ver una serie de errores sobre "do" inesperados; Estos pueden ser ignorados.
A continuación, se muestra un inicio de captura correcto:

Isilon-1% sudo isi_for_array 'for iface in `ifconfig | grep -B3 ether | grep flags | grep -v ISIINTERNAL | cut -d ":" -f1`; do echo `hostname`; sudo tcpdump -i $iface -s1000 -w /ifs/data/tcpdump/$(date +%F)/`hostname`_"$iface"_$(date +%F_%H%M%S).pcap &; done'

Syntax error: "do" unexpected
Syntax error: "do" unexpected
Syntax error: "do" unexpected
Isilon-1: Isilon-1
Isilon-3: Isilon-3
Isilon-1: Isilon-1
Isilon-2: Isilon-2
Isilon-1: tcpdump: WARNING: unable to contact casperd
Isilon-1: tcpdump: WARNING: em2: no IPv4 address assigned
Isilon-1: tcpdump: WARNING: unable to contact casperd
Isilon-1: tcpdump: listening on em1, link-type EN10MB (Ethernet), capture size 1000 bytes
Isilon-1: tcpdump: listening on em2, link-type EN10MB (Ethernet), capture size 1000 bytes
Isilon-3: Isilon-3
Isilon-3: tcpdump: WARNING: em1: no IPv4 address assigned
Isilon-3: tcpdump: WARNING: unable to contact casperd
Isilon-3: tcpdump: WARNING: em2: no IPv4 address assigned
Isilon-3: tcpdump: WARNING: unable to contact casperd
Isilon-3: tcpdump: listening on em1, link-type EN10MB (Ethernet), capture size 1000 bytes
Isilon-3: tcpdump: listening on em2, link-type EN10MB (Ethernet), capture size 1000 bytes
Isilon-2: Isilon-2
Isilon-2: tcpdump: WARNING: em2: no IPv4 address assigned
Isilon-2: tcpdump: WARNING: unable to contact casperd
Isilon-2: tcpdump: WARNING: em1: no IPv4 address assigned
Isilon-2: tcpdump: WARNING: unable to contact casperd
Isilon-2: tcpdump: listening on em2, link-type EN10MB (Ethernet), capture size 1000 bytes
Isilon-2: tcpdump: listening on em1, link-type EN10MB (Ethernet), capture size 1000 bytes

# Pressed Ctrl+C to return to shell
Isilon-1%

When checking running processes, expect to see something like the following:

Isilon-1% sudo isi_for_array "ps -auwwxx | grep tcpdump | grep -v grep"
Isilon-3: root      71317   0.0  0.3  90240  6188  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-3_2018-09-14_152532.pcap
Isilon-3: root      71322   0.0  0.3  90240  6188  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-3_2018-09-14_152532.pcap
Isilon-3: root      71323   0.0  0.4  70236  7816  -  SN    3:25PM     0:00.02 tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-3_2018-09-14_152532.pcap
Isilon-3: root      71324   0.0  0.4  70236  7820  -  SN    3:25PM     0:00.02 tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-3_2018-09-14_152532.pcap
Isilon-1: root      76007   0.0  0.3  89984   6088  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-1_2018-09-14_152532.pcap
Isilon-1: root      76012   0.0  0.3  89984   6088  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-1_2018-09-14_152532.pcap
Isilon-1: root      76013   0.0  0.4  70236   7736  -  SN    3:25PM     0:00.02 tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-1_2018-09-14_152532.pcap
Isilon-1: root      76014   0.0  0.4  70236   7736  -  SN    3:25PM     0:00.02 tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-1_2018-09-14_152532.pcap
Isilon-2: root      51721   0.0  0.3  90240  6180  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-2_2018-09-14_152532.pcap
Isilon-2: root      51726   0.0  0.3  90240  6180  -  SN@   3:25PM     0:00.01 sudo tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-2_2018-09-14_152532.pcap
Isilon-2: root      51727   0.0  0.4  70236  7752  -  SN    3:25PM     0:00.02 tcpdump -i em2 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-2_2018-09-14_152532.pcap
Isilon-2: root      51728   0.0  0.4  70236  7752  -  SN    3:25PM     0:00.02 tcpdump -i em1 -s1000 -w /ifs/data/tcpdump/2018-09-14/Isilon-2_2018-09-14_152532.pcap

After killing tcpdump, expect to see the following:

Isilon-1% sudo isi_for_array "ps -auwwxx | grep tcpdump | grep -v grep"
Isilon-2 exited with status 1
Isilon-1 exited with status 1
Isilon-3 exited with status 1

Affected Products

Isilon
Article Properties
Article Number: 000019451
Article Type: How To
Last Modified: 22 May 2025
Version:  4
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