OpenShift Container Platform 4 Master Nodes not always getting the same IP after restart when using dhcpd
Issue
- Our OpenShift Container Platform 4 Master Nodes running Red Hat CoreOS are regularly getting a new IP assigned by the DHCP server (dhcpd).
-
The lease file of the DHCP server shows the same MAC address but a different "UID" for each entry:
$ cat /var/lib/dhcpd/dhcpd.leases [..] lease 10.228.108.221 { starts 5 2020/10/30 14:42:33; ends 5 2020/10/30 14:52:33; tstp 5 2020/10/30 14:52:33; cltt 5 2020/10/30 14:42:33; binding state free; hardware ethernet 00:50:56:ab:bd:ef; uid "\377V\224\275\270\000\004/Q\343\243\025<E\026\211\244\022`\261Y4)"; } lease 10.228.108.226 { starts 1 2021/01/11 14:30:37; ends 1 2021/01/11 14:40:37; tstp 1 2021/01/11 14:40:37; cltt 1 2021/01/11 14:30:37; binding state free; hardware ethernet 00:50:56:ab:bd:ef; uid "\001\000PV\224\275\270"; }
Environment
- Red Hat OpenShift Container Platform (OCP) 4
- DHCP server running
dhcpd
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