Compute Instances with CentOS Image is Unavailable After Some Period Of Time

(Doc ID 2293070.1)

Last updated on APRIL 10, 2018

Applies to:

Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0]
Information in this document applies to any platform.

Symptoms

Customer complained that after some period of time (12 - 48 Hrs) instances become unavailable over network (any protocol, private or public IPs) and
stay in this state till restart (stop and start). All three region and both BM and VM affected. Image used here was CentOS-7-2017.04.18-0.

Changes

Though customer confirmed that the Network Manager is disabled on this environment, from the console manager, we identified that the Network Manager was not disabled.

Starting Network Manager...
[ 68.570282] cloud-init[2186]: Cloud-init v. 0.7.5 running 'init-local' at Fri, 30 Jun 2017 12:10:51 +0000. Up 68.51 seconds.
[ OK ] Started Initial cloud-init job (pre-networking).
[ OK ] Started Network Manager.
Starting Network Manager Wait Online...
Starting Network Manager Script Dispatcher Service...
[ OK ] Started Network Manager Script Dispatcher Service.

Cause

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