Search Engine: Elastic

Article ID: 131417, created on Sep 5, 2017, last review on Sep 5, 2017

  • Applies to:
  • Operations Automation 7.1

Symptoms

Autoscale rules are not delivered to Virtuozzo hosts. Attempt to apply new autoscale rules results in its 'infinite' application in IM UI, but rules are never effectively applied on Virtualization side.

Autoscale set request is correctly processed on IM side and sent to VZ node. After some timeout an error could be seen in vps.log:

AutoscaleRuleDeliveryTask.error(-2, No response to SNMP SET operation)

According to network and firewall settings, communication ports of SNMP (1161, 161) are not blocked on both sides, however, according to tcpdump capture, packets are not sent back to IM. Additionally, checksum errors could be seen in dump:

# tcpdump -A -i any -vvv port 1162 or port 161

oaciim.provider.local.health-trap > 172.24.100.51.snmp: [bad udp cksum 5237!]  { SNMPv2c C=parallels { SetRequest<...>

Cause

Network issues or incorrect net device configuration.

Resolution

General recommendations are following:

  1. Disable unnecessary modules RmondMIB and systemview from /etc/snmp/smpd.local.conf:

    dlmod   RmondMIB        /usr/lib64/rmond/rmond.so
    view    systemview      included        .1.3.6.1.4.1
    
  2. Disable checksumming on backnet interface:

    # ethtool --offload  eth0  rx off  tx off
    # ethtool -K eth0 gso off
    
  3. Contact your local netwoek administrator to further investigate the issue.

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 8c199f0ee4305da1a577740620df4a51 1941880841f714e458ae4dc3d9f3062d

Email subscription for changes to this article
Save as PDF