Localhost lo interface accessibility from probe
Issue
- I am trying to run health probe on RHEL7 server:
https://github.com/kubernetes/contrib/tree/master/exec-healthz - In one terminal I’m running :
# bin/amd64/exechealthz --cmd "ls /tmp/test"
- Service is running and listening on all interfaces:
# ss -nap| grep 8080
tcp LISTEN 0 128 :::8080 :::* users:(("exechealthz",pid=27605,fd=3))
# ping localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.037 ms
- On other terminal trying to check status:
[# curl http://localhost:8080/healthz
<HTML><HEAD><TITLE>Network Error</TITLE></HEAD>
<BODY>
<FONT face="Helvetica"><big><strong></strong></big><BR></FONT>
<blockquote>
<TABLE border=0 cellPadding=1 width="80%">
<TR><TD>
<FONT face="Helvetica"><big>Network Error (dns_unresolved_hostname)</big><BR><BR></FONT>
</TD></TR><TR><TD><FONT face="Helvetica">Your requested host "localhost" could not be resolved by DNS.</FONT></TD></TR><TR><TD>
<FONT face="Helvetica"></FONT></TD></TR><TR><TD><FONT face="Helvetica" SIZE=2><BR>For assistance, contact your network support team.</FONT></TD></TR>
</TABLE>
</blockquote>
</FONT>
</BODY></HTML>
- But asking for status on public IP of server is providing expected response
# curl http://192.168.100.10:8080/healthz
ok
- First I thought that it might be a DNS issue, but:
# curl http://127.0.0.1:8080/healthz
<HTML>
<HEAD><TITLE>Redirection</TITLE></HEAD>
<BODY><H1>Redirect</H1></BODY>
- Lo connection is not active in nmcli is it OK ?
- How to configure it so I will get response on localhost.
Environment
- Red Hat Enterprise Linux 7.2
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.
