Configuring Keepalived to Run in a Dedicated Namespace on Red Hat Enterprise Linux 8.10

Issue

• Configuring keepalived in a dedicated namespace using the net_namespace parameter in /etc/keepalived/keepalived.conf causes systemctl start keepalived to fail with a timeout:

● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
   Active: failed (Result: timeout) since Fri 2024-10-18 15:16:28 EDT; 7s ago
  Process: 4435 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
    Tasks: 2 (limit: 36091)
   Memory: 1.5M
   CGroup: /system.slice/keepalived.service
           ├─4436 /usr/sbin/keepalived -D
           └─4437 /usr/sbin/keepalived -D

Oct 18 15:15:01 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: (VI_1) Sending/queueing gratuitous ARPs on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:15:06 rhel8u10.example.com Keepalived_vrrp_LB[4437]: Sending gratuitous ARP on enp7s0 for 192.168.0.254
Oct 18 15:16:28 rhel8u10.example.com systemd[1]: keepalived.service: start operation timed out. Terminating.
Oct 18 15:16:28 rhel8u10.example.com systemd[1]: keepalived.service: Failed with result 'timeout'.
Oct 18 15:16:28 rhel8u10.example.com systemd[1]: Failed to start LVS and VRRP High Availability Monitor.