Prometeus Failed to start TCP listener on \"0.0.0.0\" port 9094:

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When I'm trying to run Prometheus alert manager with alertmanager --config.file /etc/alertmanager/alertmanager.yml

It giving me error like

   $ alertmanager --config.file /etc/alertmanager/alertmanager.yml
level=info ts=2021-11-10T05:08:13.937Z caller=main.go:216 msg="Starting Alertmanager" version="(version=0.21.0, branch=HEAD, revision=4c6c03ebfe21009c546e4d1e9b92c371d67c021d)"
level=info ts=2021-11-10T05:08:13.937Z caller=main.go:217 build_context="(go=go1.14.4, user=root@dee35927357f, date=20200617-08:54:02)"
level=info ts=2021-11-10T05:08:13.939Z caller=cluster.go:161 component=cluster msg="setting advertise address explicitly" addr=<PrivateIP> port=9094
level=error ts=2021-11-10T05:08:13.940Z caller=main.go:241 msg="unable to initialize gossip mesh" err="create memberlist: Could not set up network transport: failed to obtain an address: Failed to start TCP listener on \"0.0.0.0\" port 9094: listen tcp 0.0.0.0:9094: bind: address already in use"

I checked the listening port by netstat -tnlp

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
                
tcp6       0      0 :::9094                 :::*                    LISTEN      -

I tried too kill the process with sudo kill -9 $(sudo lsof -t -i:9094) and fuser -n tcp -k 9094

I'm not getting how to resolve that issue.

prometheus-alertmanager prometheus port
1 Answers

It's unclear why the port is unavailable.

But, if you don't need high availability, you can disable it and alertmanager won't try to use that port with:

alertmanager \
--cluster.listen-address= \
--config.file=/etc/alertmanager/alertmanager.yml

See: https://github.com/prometheus/alertmanager#high-availability

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