NAME

       systemd-journal-gatewayd.service, systemd-journal-gatewayd.socket, systemd-journal-
       gatewayd - HTTP server for journal events

SYNOPSIS

       systemd-journal-gatewayd.service

       systemd-journal-gatewayd.socket

       /lib/systemd/systemd-journal-gatewayd [OPTIONS...]

DESCRIPTION

       systemd-journal-gatewayd serves journal events over the network. Clients must connect
       using HTTP. The server listens on port 19531 by default. If --cert= is specified, the
       server expects HTTPS connections.

       The program is started by systemd(1) and expects to receive a single socket. Use systemctl
       start systemd-journal-gatewayd.socket to start the service, and systemctl enable
       systemd-journal-gatewayd.socket to have it started on boot.

OPTIONS

       The following options are understood:

       --cert=
           Specify the path to a file containing a server certificate in PEM format. This option
           switches systemd-journal-gatewayd into HTTPS mode and must be used together with
           --key=.

       --key=
           Specify the path to a file containing a server key in PEM format corresponding to the
           certificate specified with --cert=.

       --trust=
           Specify the path to a file containing a CA certificate in PEM format.

       -D DIR, --directory=DIR
           Takes a directory path as argument. If specified, systemd-journal-gatewayd will serve
           the specified journal directory DIR instead of the default runtime and system journal
           paths.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

SUPPORTED URLS

       The following URLs are recognized:

       /browse
           Interactive browsing.

       /entries[?option1&option2=value...]
           Retrieval of events in various formats.

           The Accept: part of the HTTP header determines the format. Supported values are
           described below.

           The Range: part of the HTTP header determines the range of events returned. Supported
           values are described below.

           GET parameters can be used to modify what events are returned. Supported parameters
           are described below.

       /machine
           Return a JSON structure describing the machine.

           Example:

               { "machine_id" : "8cf7ed9d451ea194b77a9f118f3dc446",
                 "boot_id" : "3d3c9efaf556496a9b04259ee35df7f7",
                 "hostname" : "fedora",
                 "os_pretty_name" : "Fedora 19 (Rawhide)",
                 "virtualization" : "kvm",
                 ...}

       /fields/FIELD_NAME
           Return a list of values of this field present in the logs.

ACCEPT HEADER

       Accept: format

       Recognized formats:

       text/plain
           The default. Plaintext syslog-like output, one line per journal entry (like journalctl
           --output short).

       application/json
           Entries are formatted as JSON data structures, one per line (like journalctl --output
           json). See Journal JSON Format[1] for more information.

       text/event-stream
           Entries are formatted as JSON data structures, wrapped in a format suitable for
           Server-Sent Events[2] (like journalctl --output json-sse).

       application/vnd.fdo.journal
           Entries are serialized into a binary (but mostly text-based) stream suitable for
           backups and network transfer (like journalctl --output export). See Journal Export
           Format[3] for more information.

RANGE HEADER

       Range: entries=cursor[[:num_skip]:num_entries]

       where cursor is a cursor string, num_skip is an integer, num_entries is an unsigned
       integer.

       Range defaults to all available events.

URL GET PARAMETERS

       Following parameters can be used as part of the URL:

       follow
           wait for new events (like journalctl --follow, except that the number of events
           returned is not limited).

       discrete
           Test that the specified cursor refers to an entry in the journal. Returns just this
           entry.

       boot
           Limit events to the current boot of the system (like journalctl -b).

       KEY=match
           Match journal fields. See systemd.journal-fields(7).

EXAMPLES

       Retrieve events from this boot from local journal in Journal Export Format[3]:

           curl --silent -H'Accept: application/vnd.fdo.journal' \
                  'http://localhost:19531/entries?boot'

       Listen for core dumps:

           curl 'http://localhost:19531/entries?follow&MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1'

SEE ALSO

       systemd(1), journalctl(1), systemd-journald.service(8), systemd.journal-fields(7),

NOTES

        1. Journal JSON Format
           https://www.freedesktop.org/wiki/Software/systemd/json

        2. Server-Sent Events
           https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events

        3. Journal Export Format
           https://www.freedesktop.org/wiki/Software/systemd/export