sdjournal - Provide an interface to capture systemd journal entries.
sdjournal [ --help ] [ --version ] [ --extcap-interfaces ] [ --extcap-dlts ] [ --extcap-interface=<interface> ] [ --extcap-config ] [ --capture ] [ --fifo=<path to file or pipe> ] [ --start-from=<entry count> ]
sdjournal is an extcap tool that allows one to capture systemd journal entries. It can be used to correlate system events with network traffic.
Supported interfaces:
Print program arguments.
Print program version.
List available interfaces.
Use specified interfaces.
List DLTs of specified interface.
List configuration options of specified interface.
Start capturing from specified interface and write raw packet data to the location specified by --fifo.
Save captured packet to file or send it through pipe.
Start from the last <entry count> entries, similar to the "-n" or "--lines" argument for the tail(1) command. Values prefixed with a + sign start from the beginning of the journal, otherwise the count starts from the end. The default value is 10. To include all entries use +0.
To see program arguments:
sdjournal --help
To see program version:
sdjournal --version
To see interfaces:
sdjournal --extcap-interfaces
Only one interface (sdjournal) is supported.
Output:
interface {value=sdjournal}{display=systemd journal capture}
To see interface DLTs:
sdjournal --extcap-interface=sdjournal --extcap-dlts
Output:
dlt {number=147}{name=sdjournal}{display=USER0}
To see interface configuration options:
sdjournal --extcap-interface=sdjournal --extcap-config
Output:
arg {number=0}{call=--start-from}{display=Starting position}{type=string}
{tooltip=The journal starting position. Values with a leading "+" start from the beginning, similar to the "tail" command}
To capture:
sdjournal --extcap-interface=sdjournal --fifo=/tmp/sdjournal.pcap --capture
To capture all entries since the system was booted:
sdjournal --extcap-interface=sdjournal --fifo=/tmp/sdjournal.pcap --capture --start-from +0
NOTE: To stop capturing CTRL+C/kill/terminate application.
wireshark(1), tshark(1), dumpcap(1), extcap(4), tcpdump(1)
sdjournal is part of the Wireshark distribution. The latest version of Wireshark can be found at https://www.wireshark.org.
HTML versions of the Wireshark project man pages are available at: https://www.wireshark.org/docs/man-pages.
Original Author
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Gerald Combs <gerald[AT]wireshark.org>