nmcli changes do not persist between reboots
Environment
- Red Hat OpenShift Container Platform (RHOCP)
- 4.7
- 4.8
- 4.9
Issue
When manually making network changes to a Red Hat CoreOS OpenShift node using nmcli
the change is lost after rebooting.
Resolution
-
This issue was fixed for some clusters in
4.10.3
with Pull Request 2742 -
If your version is affected, copy the contents of the
tmpfs
mount to the persistent filesystem using the following command:
nmcli connection modify <con_name> ipv6.method dhcp
cp /etc/NetworkManager/systemConnectionsMerged/<con_name>.nmconnection /etc/NetworkManager/system-connections/<con_name>.nmconnection`
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Root Cause
This Issue was introduced due to changes made to CoreOS and the NetworkManager config for the NMState operator. This included creating an overlay filesystem that allowed nmstate
to write network manager configurations without persisting them to disk, this would allow changes to automatically revert on reboot. However, this has the side effect of also affecting nmcli
changes.
More details can be found in Bug Report: 1970021.
Diagnostic Steps
To check if a cluster is affected by the overlay filesystem, run the below command. An example of the output is shown.
If there is no output, this issue does not apply to the cluster.
# mount | grep NetworkManager
overlay on /etc/NetworkManager/systemConnectionsMerged type overlay (rw,relatime,seclabel,lowerdir=/etc/NetworkManager/system-connections,upperdir=/run/nm-system-connections,workdir=/run/nm-system-connections-work)
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