Forwards messages from the journal to other hosts over the network using the Syslog Protocol (RFC 5424). It can be configured to send messages to both unicast and multicast addresses. systemd-netlogd runs with own user systemd-journal-netlog. Starts sending logs when network is up and stops sending as soon as network is down (uses sd-network). It reads from journal and forwards to network one by one. It does not use any extra disk space.
Install build dependencies:
# On Debian/Ubuntu
sudo apt install build-essential gperf libcap-dev libsystemd-dev pkg-config meson python3-sphinx
# On CentOS/RHEL/Fedora
sudo dnf group install 'Development Tools'
sudo dnf install gperf libcap-devel pkg-config systemd-devel meson python3-sphinx
Build and install:
make
sudo make install
sudo useradd -r -d / -s /usr/sbin/nologin -g systemd-journal systemd-journal-netlog
systemd-networkd reads configuration files named /etc/systemd/systemd-netlogd.conf and /etc/systemd/systemd-netlogd.conf.d/*.conf.
[NETWORK] SECTION OPTIONS
The "[Network]" section only applies for UDP multicast address and Port:
Address=
Controls whether log messages received by the systemd daemon shall be forwarded
to a unicast UDP address or multicast UDP network group in syslog RFC 5424 format.
The the address string format is similar to socket units. See systemd.socket(1)
Protocol=
Specifies whether to use udp or tcp protocol. Defaults to udp.
Optional settings
StructuredData=
Meta information about the syslog message, which can be used for Cloud Based
syslog servers, such as Loggly
EXAMPLE
Example 1. /etc/systemd/systemd-netlogd.conf
[Network]
Address=239.0.0.1:6000
#Protocol=udp
Example 2. /etc/systemd/systemd-netlogd.conf
[Network]
Address=192.168.8.101:514
#Protocol=udp
Example 3. /etc/systemd/systemd-netlogd.conf
[Network]
Address=192.168.8.101:514
#Protocol=udp
StructuredData=[1ab456b6-90bb-6578-abcd-5b734584aaaa@41058]