Re: [Users] loopback connection problem

Denis Zinevich Sun, 18 May 2014 01:46:22 -0700

juts got fresh info which narrows problem:

I was comparing normal and faulty containers, and found that they are using different kernels (on one server containers were not restarted after yum upgrade)

so normal one was using 2.6.32-042stab084.26

and faulty - 2.6.32-042stab085.20

Then I've restarted normal container (084.26), so now it uses 085.20. Got same problem on previously normal container - no more connection to localhost.

18.05.2014, 10:38, "Denis Zinevich" <l...@ngc.net.ua>:

iconfig:

eth0      Link encap:Ethernet HWaddr 00:18:51:A6:4F:22
          inet addr:78.78.77.77 Bcast:78.78.77.255 Mask:255.255.255.128
          inet6 addr: fe80::218:51ff:fea6:4f22/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:113671 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44739 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:14085378 (13.4 MiB) TX bytes:10667627 (10.1 MiB)

eth0:1    Link encap:Ethernet HWaddr 00:18:51:A6:4F:22
          inet addr:78.78.77.75 Bcast:78.78.77.255 Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

eth1      Link encap:Ethernet HWaddr 00:18:51:7C:CF:57
          inet addr:192.168.2.11 Bcast:192.168.2.255 Mask:255.255.255.0
          inet6 addr: fe80::218:51ff:fe7c:cf57/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:82934 errors:0 dropped:0 overruns:0 frame:0
          TX packets:81484 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:19472524 (18.5 MiB) TX bytes:19234809 (18.3 MiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:16922 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16922 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1216942 (1.1 MiB) TX bytes:1216942 (1.1 MiB)

iptables - is just empty, everything ACCEPT, not nat or other tables used

netstat:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      933/nginx
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      590/sshd
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      884/sendmail
tcp        0      0 0.0.0.0:443                 0.0.0.0:*                   LISTEN      933/nginx
tcp        0      0 0.0.0.0:5666                0.0.0.0:*                   LISTEN      866/nrpe
tcp        0      0 127.0.0.1:9000              0.0.0.0:*                   LISTEN      919/php-fpm
tcp        1      0 192.168.2.11:46444           192.168.2.61:514             CLOSE_WAIT 495/rsyslogd
tcp        0      0 :::22                       :::*                        LISTEN      590/sshd
tcp        0      0 :::5666                     :::*                        LISTEN      866/nrpe
udp        0      0 0.0.0.0:694                 0.0.0.0:*                               862/heartbeat: writ
udp        0      0 127.0.0.1:123               0.0.0.0:*                               604/ntpd
udp        0      0 78.78.77.75:123          0.0.0.0:*                               604/ntpd
udp        0      0 78.78.77.77:123          0.0.0.0:*                               604/ntpd
udp        0      0 192.168.2.11:123             0.0.0.0:*                               604/ntpd
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               604/ntpd
udp        0      0 0.0.0.0:53930               0.0.0.0:*                               862/heartbeat: writ
udp        0      0 ::1:123                     :::*                                    604/ntpd
udp        0      0 fe80::218:51ff:fea6:4f22:123 :::*                                    604/ntpd
udp        0      0 fe80::218:51ff:fe7c:cf57:123 :::*                                    604/ntpd
udp        0      0 :::123                      :::*                                    604/ntpd

18.05.2014, 10:04, "Dragomir Zhelev" <dr...@delta.bg>:
Please return output of next commands :

ifconfig
iptables -nvL
netstat -putan

Regards!

On 18.05.2014 09:17, Denis Zinevich wrote:
Hello,

I have 2 identical hardware servers - for HA, so they also have everything identical inside (OS, settings, etc, just IP's differ).
OS - CentOS 6.5, 2.6.32-042stab085.20
ploop containers made from basic template, use veth networking.
On some of them nagios checks fails (those that use localhost to check).
Problem itself:
only on one server (on first it never happened), on containers sometimes (no system, but often) I can't establish connection to 127.0.0.1
no matter what port I use, I tried 80,22 and all others that are listening - connection timed out.
I compared networks setings, sysctl's and so on - no difference found.
Now mailing to this list because even do not have more ideas where to digg.
--
Denis
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--
Dragomir Zhelev
CEO
Delta SoftMedia OOD
Cellular: +359 895 66 99 79
E-mail: dr...@delta.bg
Web: Delta.BG

,
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,
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Re: [Users] loopback connection problem

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