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Posted to dev@cloudstack.apache.org by SudharmaJain <gi...@git.apache.org> on 2015/09/16 08:36:28 UTC
[GitHub] cloudstack pull request: CLOUDSTACK-8863: VM doesn't reconnect to ...
GitHub user SudharmaJain opened a pull request:
https://github.com/apache/cloudstack/pull/836
CLOUDSTACK-8863: VM doesn't reconnect to internet post VR RESTART/STO…
…P-START/RECREATE
The ongoing ICMP request reply session is broken when the VR is down, the expectation is that it would resume once the VR is up. Investigations revealed that the ongoing ICMP packets are sent out of eth2 without being NATed post VR stop/start or restart or recreate.
TCPDUMP output from VR post restart/stop-start/recreate on eth2:
root@r-4-VM:~# tcpdump -i eth2 icmp -n -vvv
tcpdump: listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
06:22:52.749770 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 81, length 64
06:22:53.749782 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 82, length 64
06:22:54.749771 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 83, length 64
06:22:55.749775 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 84, length 64
06:22:56.749765 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 85, length 64
06:22:57.749776 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.200.67 > 173.194.33.163: ICMP echo request, id 30996, seq 86, length 64
^C
6 packets captured
6 packets received by filter
0 packets dropped by kernel
root@r-4-VM:~#
root@r-4-VM:~# grep icmp /proc/net/ip_conntrack
icmp 1 29 src=192.168.200.67 dst=173.194.33.163 type=8 code=0 id=30996 [UNREPLIED] src=173.194.33.163 dst=192.168.200.67 type=0 code=0 id=30996 mark=0 use=2
This get fixed after flushing the conntrack table.
Screenshots:
Before fix (ping session doesn't resume, stop and starting the ping works, 120 packets lost):
After fix(ping session resumes, 27 packets lost):
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/SudharmaJain/cloudstack cs-8863
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/cloudstack/pull/836.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #836
----
commit 321bba79579eab9cd59a1697a2d4b0ff6ae54bec
Author: sudharma jain <su...@citrix.com>
Date: 2015-09-16T05:25:57Z
CLOUDSTACK-8863: VM doesn't reconnect to internet post VR RESTART/STOP-START/RECREATE
----
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[GitHub] cloudstack pull request: CLOUDSTACK-8863: VM doesn't reconnect to ...
Posted by asfgit <gi...@git.apache.org>.
Github user asfgit closed the pull request at:
https://github.com/apache/cloudstack/pull/836
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[GitHub] cloudstack pull request: CLOUDSTACK-8863: VM doesn't reconnect to ...
Posted by bhaisaab <gi...@git.apache.org>.
Github user bhaisaab commented on a diff in the pull request:
https://github.com/apache/cloudstack/pull/836#discussion_r39598913
--- Diff: systemvm/patches/debian/config/opt/cloud/bin/vr_cfg.sh ---
@@ -93,4 +93,16 @@ done < $cfg
#remove the configuration file, log file should have all the records as well
rm -f $cfg
+# Flush kernel conntrack table
+log_it "VR config: Flushing conntrack table"
+ps cax | grep conntrackd > /dev/null
+if [ $? -eq 0 ]; then
--- End diff --
instead of ps <args> | grep, why not use status result and start, like: service conntrackd status || service conntrackd start (or other commands) etc.
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[GitHub] cloudstack pull request: CLOUDSTACK-8863: VM doesn't reconnect to ...
Posted by wilderrodrigues <gi...@git.apache.org>.
Github user wilderrodrigues commented on the pull request:
https://github.com/apache/cloudstack/pull/836#issuecomment-142922779
@jayapalu @karuturi
We, @remibergsma, Funs and I will test the 3 PRs which are VR related now.
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[GitHub] cloudstack pull request: CLOUDSTACK-8863: VM doesn't reconnect to ...
Posted by SudharmaJain <gi...@git.apache.org>.
Github user SudharmaJain commented on the pull request:
https://github.com/apache/cloudstack/pull/836#issuecomment-140687549
@bhaisaab, using service conntrackd status don't provide the status and always gives the usage information for conntrackd. So i have added the changes by starting conntrackd in deamon mode with (-d) switch.
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