runCDN

#!/bin/bash 

HTTP1="cdn-http1.5700.network"
HTTP2="cdn-http2.5700.network"
HTTP3="cdn-http3.5700.network"
HTTP4="cdn-http4.5700.network"
HTTP5="cdn-http5.5700.network"
HTTP6="cdn-http6.5700.network"
HTTP7="cdn-http7.5700.network"
HTTP_SERVERS=($HTTP1 $HTTP2 $HTTP3 $HTTP4 $HTTP5 $HTTP6 $HTTP7)
DNS_SERVER="cdn-dns.5700.network"
HTTP_DIR="http_server"
DNS_DIR="dns_server"

# (1) PARSE INPUT ARGUMENTS:
while getopts ":p:o:n:u:i:" args; do
  case $args in
    p) 
      port="$OPTARG"
      ;;
    o) 
      origin="$OPTARG"
      ;;
    n)
      name="$OPTARG"
      ;;
    u) 
      username="$OPTARG"
      ;;
    i)
      keyfile="$OPTARG"
      ;;
    ?) 
      echo "Invalid option -$OPTARG" >$2  # >$2=stderr
      echo "Should be of form: ./deployCDN -p <port> -o -<origin> -n <name> -u <username> -i <keyfile>" >$2
      exit 1
      ;;
  esac
done

DNS_KEY_FILE_PATH="/home/${username}/${DNS_DIR}/kf"
SOURCE_FILE_PATH="/home/${username}/${DNS_DIR}/cache"
DESTINATION_FILE_PATH="/home/${username}/${HTTP_DIR}/cache"

# (2) START RUNNING HTTP SERVER (on each http server node):
for SERVER in "${HTTP_SERVERS[@]}"; do 
	ssh -i $keyfile $username@$SERVER "\
        nohup /home/${username}/$HTTP_DIR/httpserver -p $port -o $origin > /dev/null 2>&1 & \
    "
	echo "HTTP server at ${username}@$SERVER is running" 
done 

# (3) SCP DNS /CACHE/ FOLDER TO HTTP SERVERS:
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP1}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP2}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP3}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP4}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP5}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP6}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"
ssh -t -q "${username}@${DNS_SERVER}" "tar czf - ${SOURCE_FILE_PATH} | ssh -i '${DNS_KEY_FILE_PATH}' '${username}@${HTTP7}' 'mkdir -p ${DESTINATION_FILE_PATH} && tar xzf - -C ${DESTINATION_FILE_PATH}'"

ssh -i $keyfile $username@$DNS_SERVER "\
    rm -rf /home/${username}/${DNS_DIR}/cache \
"
echo "Removed /cache/ from DNS server"

# (4) START RUNNING DNS SERVER:
# This command redirects both the standard output (stdout) and standard error (stderr) to /dev/null, which discards the output. 
# The 2>&1 syntax means "redirect stderr (file descriptor 2) to the same destination as stdout (file descriptor 1).
ssh -i $keyfile $username@$DNS_SERVER "\
  nohup /home/${username}/$DNS_DIR/dnsserver -p $port -n $name > /dev/null 2>&1 & \
"
echo "DNS server at $DNS_SERVER is running"

wait

echo "CDN is running!"