Make sure the network is actually up at the moment of the service startup:

https://systemd.io/NETWORK_ONLINE/

galera.spec

@@ -17,6 +17,7 @@ Source0:        http://releases.galeracluster.com/source/%{name}-%{version}.tar.
 
 Patch0:         cmake_paths.patch
 Patch1:         docs.patch
+Patch2:         network.patch
 
 BuildRequires:  boost-devel check-devel openssl-devel cmake systemd gcc-c++ asio-devel
 Requires(pre):  /usr/sbin/useradd
@@ -37,6 +38,7 @@ description of Galera replication engine see https://www.galeracluster.com web.
 %setup -q
 %patch -P0 -p1
 %patch -P1 -p1
+%patch -P2 -p1
 
 %build
 %{set_build_flags}

network.patch

@@ -0,0 +1,15 @@
+Make sure the network is actually up at the moment of the service startup:
+https://systemd.io/NETWORK_ONLINE/
+
+--- galera-26.4.18/garb/files/garb.service	2024-04-17 19:39:35.000000000 +0200
++++ galera-26.4.18/garb/files/garb.service_patched	2024-06-09 07:47:19.245480639 +0200
+@@ -4,7 +4,8 @@
+ Description=Galera Arbitrator Daemon
+ Documentation=man:garbd(8)
+ Documentation=https://galeracluster.com/library/documentation/arbitrator.html
+-After=network.target
++After=network-online.target
++Wants=network-online.target
+ 
+ [Install]
+ WantedBy=multi-user.target