Salt: connection refused to proxy
I have troubles with Salt, installed on an HPC cluster. All maintenance commands (i.e. salt commands) are made from master0. The minions to be managed are named node0, node1, ..., node4. When I try to install a package on a minion (let's say python's numpy on node0), I get the following error:
[root@master0 ~]# salt 'node0' pkg.install python3-numpy
*duplicate lines removed*
https://vault.centos.org/7.8.2003/os/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to master0:3142; Connection refused"
On node0, file /etc/yum.conf looks like this:
[main]
exclude=ibutils-libs*
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=5
bugtracker_url=http://bugs.centos.org/set_project.php?project_id=23&ref=http://bugs.centos.org/bug_report_page.php?category=yum
distroverpkg=centos-release
proxy=http://master0:3142
As far as I understand, node0 does not manage to connect to master0 through port 3142. Indeed, I can curl master0 on default port (80 I guess), but not on 3142:
[root@node0 ~]# curl 'http://master0:3142'
curl: (7) Failed connect to master0:3142; Connection refused
[root@node0 ~]# curl 'http://master0'
<!DOCTYPE html>
<html>
*Some HTML stuff, not relevant here*
</body>
</html>
But I don't get where I am supposed to open this port on master0.
Note: Complete newbie here. To be honest, I don't get the point of passing through this port either, but the whole HPC structure was built by an external service provider, and I just try to handle all this stuff by my own.
Solution 1:
If you don't use a proxy, just remove the proxy= line from your yum.conf.
Alternatively, start your proxy server.
3142 is the default port of apt-cacher, which is used for Debian based distributions, but can also be used to cache RPM packages.
Your config indicates that it used to run on master0 (or you skipped steps you deemed irrelevant when following a tutorial).