Help getting Oracle Linux guest running

[jackdouglas]

I use firecracker for many of the database backends on db<>fiddle, which has been working fine for years. I can run Debian and even Alpine guests but I've always had trouble with RHEL clones like Oracle Linux.

They boot ok but don't let me log in - with this dockerfile I get stuck without a tty:

FROM mysql:8.4-oraclelinux9
RUN microdnf install -y systemd
RUN echo '[Service]' > /etc/systemd/system/fiddle.service \
  && echo 'ExecStart=/fiddle.sh' >> /etc/systemd/system/fiddle.service \
  && echo '[Install]' >> /etc/systemd/system/fiddle.service \
  && echo 'WantedBy=default.target' >> /etc/systemd/system/fiddle.service \
  && systemctl enable fiddle
RUN echo '[Service]' > /etc/systemd/system/mysqld.service \
  && echo 'ExecStart=/usr/sbin/mysqld --user=root --skip-networking --daemonize' >> /etc/systemd/system/mysqld.service \
  && echo '[Install]' >> /etc/systemd/system/mysqld.service \
  && echo 'RequiredBy=fiddle.service' >> /etc/systemd/system/mysqld.service \
  && systemctl enable mysqld
RUN echo ttyS0 > /etc/securetty
RUN microdnf clean all
RUN echo "root:Docker!" | chpasswd
ENTRYPOINT ["bash"]

and today I finally got a login prompt for the first time, but logging in a 'no login shell' error with this dockerfile:

FROM mysql:8.4-oraclelinux9
RUN microdnf install -y systemd
RUN echo '[Service]' > /etc/systemd/system/fiddle.service \
  && echo 'ExecStart=/fiddle.sh' >> /etc/systemd/system/fiddle.service \
  && echo '[Install]' >> /etc/systemd/system/fiddle.service \
  && echo 'WantedBy=default.target' >> /etc/systemd/system/fiddle.service \
  && systemctl enable fiddle
RUN echo '[Service]' > /etc/systemd/system/mysqld.service \
  && echo 'ExecStart=/usr/sbin/mysqld --user=root --skip-networking --daemonize' >> /etc/systemd/system/mysqld.service \
  && echo '[Install]' >> /etc/systemd/system/mysqld.service \
  && echo 'RequiredBy=fiddle.service' >> /etc/systemd/system/mysqld.service \
  && systemctl enable mysqld
RUN echo ttyS0 > /etc/securetty \
  && echo '[Service]' > /etc/systemd/system/mygetty.service \
  && echo 'ExecStart=/usr/sbin/agetty -L 9600 ttyS0 vt102' >> /etc/systemd/system/mygetty.service \
  && echo '[Install]' >> /etc/systemd/system/mygetty.service \
  && echo 'RequiredBy=fiddle.service' >> /etc/systemd/system/mygetty.service \
  && systemctl enable mygetty
RUN microdnf clean all
RUN echo "root:Docker!" | chpasswd
ENTRYPOINT ["bash"]

in both cases I'm building the rootfs like this:

DOCKER_BUILDKIT=1 docker build -t dummy - < DOCKERFILE
dd if=/dev/zero bs=1M count=1000 > rootfs.ext4
mkfs.ext4 rootfs.ext4
mount -o loop rootfs.ext4 mnt
docker run --rm -ti -v mnt:/my-rootfs dummy
for d in bin etc home lib lib64 opt root sbin usr dev run var; do tar c "/$d" | tar x -C /my-rootfs; done
for dir in proc sys; do mkdir /my-rootfs/${dir}; done
exit

Is there something obvious I'm doing wrong? I'm really keen to add later versions of MySQL to dbfiddle but the official docker images are all Oracle Linux based since 8.0.