Comments (1)
mathog
commented on August 10, 2024
Solved it.
The problem was that "firewalld" was running and its configuration was not in any way visible with "iptables --list". The RPMs built from the Fedora src.rpms did not set rules for firewalld which would let them work (accept connections). Without those rules gmond could still talk to gmond on other sysetms.
I only figured this out because there was for some reason a firewalld rule for "cockpit" so that nmap from another machine showed port 9090 even though lsof on the CentOS 8 machine had nothing on that port. cockpit was not running or installed, and never had been.
So add the appropriate ports to the firewalld configuration. (Forget about iptables, since it is broken/not available on CentOS 8. iptables --list still runs but it does not actually show the existing rules!)
from monitor-core.
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