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ci: pass target filename of /etc/resolv.conf in case it is a symlink

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In some Linux distributions the /etc/resolv.conf file is a symlink. This
file gets included in the Kubernetes containers and will be used for
resolving hostnames. By including the symlink, it is possible that that
target file is not available in the container(s). This will cause
problems when resolving hostnames, and Kubernetes will not get deployed.

The default minikube VM provides /run/systemd/resolve/resolv.conf, with
/etc/resolv.conf being a symlink. Therefor, it is needed to pass the
`--extra-config=kubelet.resolv-conf=..` parameter to `kubeadm`.

In case minikube is started with `--vm-driver=none` and
/run/systemd/resolve/resolv.conf does not exist, the local
/etc/resolv.conf will be used for inclusion in the Kubelet container. If
this is a symlink, the final destination should get passed with
`--extra-config=kubelet.resolv-conf=..` so that a working hostname
resolution configuration is available in the container.

Updates: #1121
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit is contained in:
Niels de Vos 2020-06-02 16:52:53 +02:00 committed by mergify[bot]
parent 365fbd1ca0
commit 81b17c5157
1 changed files with 13 additions and 2 deletions
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15
scripts/minikube.sh
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@ -78,8 +78,19 @@ fi
K8S_FEATURE_GATES=${K8S_FEATURE_GATES:-"BlockVolume=true,CSIBlockVolume=true,VolumeSnapshotDataSource=true,ExpandCSIVolumes=true"}
#extra-config for kube https://minikube.sigs.k8s.io/docs/reference/configuration/kubernetes/
EXTRA_CONFIG=${EXTRA_CONFIG:-"--extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy \
--extra-config=kubelet.resolv-conf=/run/systemd/resolve/resolv.conf"}
EXTRA_CONFIG=${EXTRA_CONFIG:-"--extra-config=apiserver.enable-admission-plugins=PodSecurityPolicy"}
# kubelet.resolv-conf needs to point to a file, not a symlink
# the default minikube VM has /etc/resolv.conf -> /run/systemd/resolve/resolv.conf
RESOLV_CONF='/run/systemd/resolve/resolv.conf'
if [[ "${VM_DRIVER}" == "none" ]] && [[ ! -e "${RESOLV_CONF}" ]]; then
# in case /run/systemd/resolve/resolv.conf does not exist, use the
# standard /etc/resolv.conf (with symlink resolved)
RESOLV_CONF="$(readlink -f /etc/resolv.conf)"
fi
# TODO: this might overload --extra-config=kubelet.resolv-conf in case the
# caller did set EXTRA_CONFIG in the environment
EXTRA_CONFIG="${EXTRA_CONFIG} --extra-config=kubelet.resolv-conf=${RESOLV_CONF}"
#extra Rook configuration
ROOK_BLOCK_POOL_NAME=${ROOK_BLOCK_POOL_NAME:-"newrbdpool"}