Patches kubelet agents with necessary ceph packages and a secretfile for mounting CephFS volumes in Kubernetes.

ceph-docker-multinode.sh

#!/bin/bash

# Script that patches kubernetes kubelet with 
# various fixes to get CephFS mounts working.

KUBELET_ID=$(docker ps | grep kubelet | cut -d' ' -f1)
KUBELET_DESC=$(docker ps | grep kubelet | awk '{print $2}')


echo -e "KUBELET_ID=$KUBELET_ID ($KUBELET_DESC)"
if [ -z ${CEPH_SECRET+x} ]; then
  echo "CEPH_SECRET is empty - please set this yourself!";
  else echo -e "CEPH_SECRET=$CEPH_SECRET\n"
fi

read -p "Proceed (Yn)? " -n 1 -r
echo    # (optional) move to a new line
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
    # handle exits from shell or function but don't exit interactive shell
    [[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
fi


echo "Installing Ceph packages"
docker exec $KUBELET_ID apt-get update
docker exec $KUBELET_ID apt-get install -y wget lsb-release apt-transport-https
docker exec $KUBELET_ID /bin/bash -c "wget -q -O- 'https://download.ceph.com/keys/release.asc' | apt-key add -"
RELEASE=$(docker exec $KUBELET_ID lsb_release -sc)
docker exec $KUBELET_ID /bin/bash -c "echo deb https://download.ceph.com/debian-jewel/ $RELEASE main | tee /etc/apt/sources.list.d/ceph.list"
docker exec $KUBELET_ID apt-get update
docker exec $KUBELET_ID apt-get install -y ceph-fs-common
docker exec $KUBELET_ID apt-get install -y ceph-common

echo "Installing Ceph secretfile"
docker exec $KUBELET_ID mkdir -p /etc/ceph
docker exec $KUBELET_ID /bin/bash -c "echo $CEPH_SECRET > /etc/ceph/admin.secret"

echo "Done"