Remove IPv6 from vApp to reduce noise in /var/log/messages

[Alan Baugher]

Background:   vApp r14.5  

 

While working with rsyslog we noticed that /var/log/messages was being swamped with error messages due to IPv6 not utilized for Network Manager.

Reference about IPv6 not used in vApp.

https://broadcomcms-software.wolkenservicedesk.com/wolken-support/kbsearch/article?articleNumber=129489

 https://knowledge.broadcom.com/external/article/129489/ipv6-supportfor-vapp.html

 

 

Example of logs events:       grep -i ipv6  /var/log/messages

 

Sep 29 06:22:58 vapp145 NetworkManager[793]: <warn>  [1727608978.3001] ipv6ll[1ad01a420750ae45,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)

Sep 29 06:23:08 vapp145 NetworkManager[793]: <warn>  [1727608988.3024] platform-linux: do-add-ip6-address[2: fe80::290a:17e6:ea50:c07]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)

Sep 29 06:23:08 vapp145 NetworkManager[793]: <warn>  [1727608988.3025] l3cfg[e72522d0d139da92,ifindex=2]: unable to configure IPv6 route: type unicast fe80::/64 dev 2 metric 1024 mss 0 rt-src ipv6ll

Sep 29 06:23:10 vapp145 NetworkManager[793]: <warn>  [1727608990.3051] platform-linux: do-add-ip6-address[2: fe80::f262:f3c1:cf89:f75c]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)

 

 

Resolution:

 

Providing this process to assist with reducing noise when using rsyslog to monitor the vApp.

 

As the 'config' user,  issue the below commands and confirm that /var/log/messages no longer has error messages related to IPv6.

 

 

sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1

sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1

sudo sysctl -p

sudo systemctl restart NetworkManager

sudo journalctl -n 100 --no-pager


Summary Note:  Use the above process to reduce "noise" for your chosen log collector (Grafana/Splunk/etc.) when using rsyslog as the intermediate process.

------------------------------
Alan Baugher
ANA
------------------------------

[Enrique Torres]

Great update, Alan. I had not encountered this yet with a client, since not too many have upgraded to r14.5.

[Alan Baugher]

Thanks Enrique, 

I plan to write up the process using another module of rsyslog on the vApp to showcase how we can see all DEBUG and stderr message in a Collector like Splunk or Grafana, from all the logs under /opt/CA/VirtualAppliance/logs.    Unfortunately, the imjournal module was not sending everything we all wish to see.

------------------------------
Alan Baugher
ANA
------------------------------