[Beowulf] ganglia on CentOS 8?

[Jonathan Engwall]

Glad to hear it.

On Thu, Apr 2, 2020, 12:18 PM David Mathog <mathog at caltech.edu> wrote:

> Solved it.
>
> The problem was that firewalld was running on CentOS 8.  It sets up a
> firewall but those changes are NOT visible in "iptables --list", so
> I didn't know it was there until an nmap from another machine showed port
> 9090 on the CentOS 8 machine.  lsof had nothing attached to 9090. This was
> super confusing. It turned out that firewalld for some reason had
> opened that port for "cockpit" even though that package is not only not
> running, but is not installed.  (And never was.)  Good thing that it did
> so, it turns out, or I would never have started looking for _another_
> firewall.
>
> So the solution is to stop firewalld and then disable it.  Otherwise, add
> rules to firewalld allowing gmond/gmetad connections.  The RPMs that were
> rebuilt from the Fedora src.rpm did not contain commands to set these
> rules, apparently.
>
> Regards,
>
> David Mathog
> mathog at caltech.edu
>
>
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