Re: Read-only rootfs on systemd [SOLVED]

[Amit <amit.uttam@gmail.com>]

Thanks for your help and the replies. So this issue is now resolved.

Summary of Issue:
Mounting root as read-only as documented in
(https://wiki.debian.org/ReadonlyRoot) because rootfs is busy.

Summary of Solution:

 1. 'lsof +L1' showed cupsd getting stuck on /etc/passwd (deleted).
    Looking at systemd journalctl, a custom service on this server was
    creating users blindly on every startup due to a bug in the code logic
    of this custom user management application. This caused /etc/passwd
    to keep changing.

    By fixing the bug, the /etc/passwd (deleted) was no longer an issue.

 2. After reading the debian wiki on ReadOnlyRoot, there is a section on
    samba creating a file /etc/samba/dhcp.conf everytime dhclient was
    called. This server has a dual ethernet port with one port not
    plugged. As a result, dhclient kept trying to get a lease for this
    eth1 port and thus samba kept creating that file in /etc and rootfs
    was always busy.

    Not sure how this issue was solved but by adding the following line
    to /etc/fstab, I don't see the repeated dhclient messages anymore:

    tmpfs           /tmp            tmpfs nodev,nosuid  0       0