andrijapanicsb opened a new issue #3788:
URL: https://github.com/apache/cloudstack/issues/3788
##### ISSUE TYPE
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* Bug Report
##### COMPONENT NAME
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Categorize the issue, e.g. API, VR, VPN, UI, etc.
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VR / DHCP
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##### CLOUDSTACK VERSION
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New line separated list of affected versions, commit ID for issues on master
branch.
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4.11+
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**PROBLEM:**
After the new VR is created as part of the network restart with cleanup, the
new VR will have missing or empty "/var/lib/misc/dnsmasq.leases" file
This will cause that the VM after 15 days of running (50% from the currently
hardcoded 30d lease duration) will try to renew it's DHCP lease by sending
DHCPREQUEST, but VR/dnsmasq is not aware of that lease (dnsmasq.leases
missing/empty), so it will send DHCPNAK, so eventually DHPC client will fail
back to the initialization process and start from scratch with DHCPDISCOVER and
get its IP again.
This doesn't mean network downtime, but on some older RHEL 6.x systems (that
assumes CentOS 6.x as well), **the "initialization" process will remove any
static routes added**, thus causing issues.
We need to ensure that the content of the "/var/lib/misc/dnsmasq.leases"
file is regenerated/populated with all the needed records on the new VR when
restarting a network with cleanup. Alos, rebootRouter / startRouter API while
"recreate.systemvm.enabled”=”true” also need to produce the same results
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