Verification done with netplan.io 0.40.1~18.04.1: I have verified that when using ip=dhcp / ip6=dhcp on the kernel cmdline to boot to a remote filesystem; initramfs's scripts correctly write "critical: true" in /run/netplan/<interface>.yaml, and that config is correctly interpreted by netplan as being entirely valid, and generates a configuration for systemd-networkd that avoids releasing IP from DHCP on 'netplan apply'.
In such an environment, running 'netplan apply' correctly leaves IP addresses coming from DHCP untouched. "CriticalConnection=true" is present in the generated config for networkd. ** Tags removed: verification-needed verification-needed-bionic ** Tags added: verification-done-bionic -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/1769682 Title: NFS-based remote root hangs when running 'netplan apply' Status in initramfs-tools package in Ubuntu: Fix Released Status in netplan.io package in Ubuntu: Fix Released Status in nplan package in Ubuntu: Invalid Status in initramfs-tools source package in Xenial: Fix Released Status in netplan.io source package in Xenial: Invalid Status in nplan source package in Xenial: Fix Released Status in initramfs-tools source package in Artful: Won't Fix Status in netplan.io source package in Artful: Invalid Status in nplan source package in Artful: Fix Released Status in initramfs-tools source package in Bionic: Fix Released Status in netplan.io source package in Bionic: Fix Committed Status in nplan source package in Bionic: Invalid Bug description: [Impact] Netboot users with a remote filesystem over NFS (possibly over other networked filesystems). [Test cases] 1) Boot a system with its root filesystem over NFS. 2) Run 'sudo netplan apply' 3) Validate that the system remains responsive and keeps connectivity over the same IP address as it had. [Regression potential] This SRU changes network properties, and enforces that networkd does not release and re-request an IP address from DHCP when it is restarted. Environments relying on the IP release/renew behavior may find themselves staying on the previous IP address, which might negatively impact connectivity. Changes in connectivity on a system running netplan should be investigated as a potential regression from this SRU. Other regression possibilities would include failure to get a new IP address over time (usually seen as losing connectivity) or possible IP conflicts on a network. --- With a system booted on the network, with its remote root fs on NFS: Running 'netplan apply' restarts systemd-networkd, which releases the IP received from DHCP. With no IP (and and IP potentially changing), the NFS server can't be reached so the system hangs. 'netplan apply' or restarting systemd-networkd should not affect teh system, it should continue working normally despite "changing" network states, as long as the effective IP remains the same. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1769682/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
