Docker entrypoint script for cassandra

configMapDockerEntrypoint.yaml

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: docker-entrypoint-sh
data:
  docker-entrypoint.sh: |
      #!/bin/bash
      set -e      # first arg is `-f` or `--some-option`
      if [ "${1:0:1}" = '-' ]; then
        set -- cassandra -f "$@"
      fi      # allow the container to be started with `--user`
      if [ "$1" = 'cassandra' -a "$(id -u)" = '0' ]; then
        chown -R cassandra /var/lib/cassandra /var/log/cassandra "$CASSANDRA_CONFIG"
        exec gosu cassandra "$BASH_SOURCE" "$@"
      fi      if [ "$1" = 'cassandra' ]; then
        : ${CASSANDRA_RPC_ADDRESS='0.0.0.0'}        : ${CASSANDRA_LISTEN_ADDRESS='auto'}
        if [ "$CASSANDRA_LISTEN_ADDRESS" = 'auto' ]; then
          CASSANDRA_LISTEN_ADDRESS="$(hostname --ip-address)"
        fi        : ${CASSANDRA_BROADCAST_ADDRESS="$CASSANDRA_LISTEN_ADDRESS"}        if [ "$CASSANDRA_BROADCAST_ADDRESS" = 'auto' ]; then
          CASSANDRA_BROADCAST_ADDRESS="$(hostname --ip-address)"
        fi
        : ${CASSANDRA_BROADCAST_RPC_ADDRESS:=$CASSANDRA_BROADCAST_ADDRESS}        if [ -n "${CASSANDRA_NAME:+1}" ]; then
          : ${CASSANDRA_SEEDS:="cassandra"}
        fi        : ${CASSANDRA_SEEDS:="$CASSANDRA_BROADCAST_ADDRESS"}
        sed -ri 's/(- seeds:).*/\1 "'"$CASSANDRA_SEEDS"'"/' "$CASSANDRA_CONFIG/cassandra.yaml"        if [ "${HOSTNAME}" == 'cassandra-0' ];then
          : ${CASSANDRA_INITIAL_TOKEN="$CASSANDRA_0_INITIAL_TOKEN"}
        elif [ "${HOSTNAME}" == 'cassandra-1' ];then
          : ${CASSANDRA_INITIAL_TOKEN="$CASSANDRA_1_INITIAL_TOKEN"}
        elif [ "${HOSTNAME}" == 'cassandra-2' ];then
          : ${CASSANDRA_INITIAL_TOKEN="$CASSANDRA_2_INITIAL_TOKEN"}
        fi
        sed -ri "s/\# initial_token\:/initial_token\: $CASSANDRA_INITIAL_TOKEN/" "$CASSANDRA_CONFIG/cassandra.yaml"       for yaml in \
         broadcast_address \
         broadcast_rpc_address \
         cluster_name \
         endpoint_snitch \
         listen_address \
         num_tokens \
         initial_token \
         rpc_address \
         start_rpc \
       ; do
         var="CASSANDRA_${yaml^^}"
         val="${!var}"
       if [ "$val" ]; then
          sed -ri 's/^(# )?('"$yaml"':).*/\2 '"$val"'/' "$CASSANDRA_CONFIG/cassandra.yaml"
        fi
       done       for rackdc in dc rack; do
         var="CASSANDRA_${rackdc^^}"
         val="${!var}"
         if [ "$val" ]; then
           sed -ri 's/^('"$rackdc"'=).*/\1 '"$val"'/' "$CASSANDRA_CONFIG/cassandra-rackdc.properties"
         fi
       done
      fi      exec "$@"