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Oracle Linux: Using _netdev In Local Filesystem Can Cause Systemd Dependencies Problems

Applies To:
Oracle Linux 8

Symptoms:

If “_netdev” is specified as an option on /etc/fstab for a local (non-network mounted) filesystem in /etc/fstab, it can cause systemd dependencies problems.

NetworkManager can fail to start, which will cause DHCP to fail to renew the IP address and the instance to become unreachable.

The logs will show messages like:

May 25 21:01:24 <HOSTNAME> systemd[1]: cloud-init.service: Found ordering cycle on NetworkManager-wait-online.service/start...
May 25 21:01:24 <HOSTNAME> systemd[1]: cloud-init.service: Found dependency on tmp.mount/start
May 25 21:01:24 <HOSTNAME> systemd[1]: cloud-init.service: Found dependency on network-online.target/start 

Cause:

SystemD will try to calculate the dependencies of each Unit during the boot. The entries in /etc/fstab will be converted to “mount” units.

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