Automated deployment of pod and proxy ssh and other ports without load-balancer

example.sh

#!/bin/bash

# Scripted deployment of a pod w/ forward ports using ssh tunnels via $JUMP_BOX.

JUMP_BOX=root@my-bastion-host

NAME="my-container-prefix-name"

CONTAINER=`kubectl -n admin get pods | grep $NAME | head -1 | awk '{print $1}'`

if [ -n "$CONTAINER" ]; then
  echo "pod for $NAME exists: $CONTAINER"
else
  echo "pod for $NAME does not exist. running..."

  kubectl -n admin run $NAME --image=ubuntu --port 8001 -- sleep infinity

  CONTAINER=`kubectl -n admin get pods | grep $NAME | head -1 | awk '{print $1}'`
  sleep 5
  kubectl -n admin exec $CONTAINER -- bash -c "shopt -s expand_aliases; source /root/.bashrc; apt-get update; apt-get install -y openssh-server vim; mkdir -p /root/.ssh"

  kubectl -n admin cp ~/.ssh/id_rsa.pub $CONTAINER:/root/.ssh/
fi

EC2_NODE=$(kubectl -n admin get pods -o wide | grep $NAME | head -1 | awk '{print $7}')
IP=$(echo "$EC2_NODE" | sed 's/.*-\([0-9]\{1,3\}-[0-9]\{1,3\}-[0-9]\{1,3\}-[0-9]\{1,3\}\).*/\1/' | sed 's/-/\./g')

echo "IP Address: $IP"

if ! echo "$(kubectl -n admin get services)" | grep -q $NAME-2002; then
  kubectl -n admin expose deployment $NAME --port 2002 --target-port 22 --name $NAME-2002  --external-ip $IP
fi

if ! echo "$(kubectl -n admin get services)" | grep -q $NAME-8001; then
  kubectl -n admin expose deployment $NAME --port 8001 --target-port 8001 --name $NAME-8001  --external-ip $IP
fi


alias $NAME-2002-up="ssh -M -S ~/.ssh/$NAME-2002.sock -fNT -L 2002:$IP:2002 $JUMP_BOX"
alias $NAME-2002-check="ssh -S ~/.ssh/$NAME-2002.sock -O check $JUMP_BOX"
alias $NAME-2002-down="ssh -S ~/.ssh/$NAME-2002.sock -O exit $JUMP_BOX"

alias $NAME-8001-up="ssh -M -S ~/.ssh/$NAME-8001.sock -fNT -L 8001:$IP:8001 $JUMP_BOX"
alias $NAME-8001-check="ssh -S ~/.ssh/$NAME-8001.sock -O check $JUMP_BOX"
alias $NAME-8001-down="ssh -S ~/.ssh/$NAME-8001.sock -O exit $JUMP_BOX"


alias connect-$NAME-shell="kubectl -n admin exec -it $CONTAINER bash"

shopt -s expand_aliases

# tunnel ports to localhost if not already up
if ! echo "$(eval $NAME-2002-check 2>&1)" | grep -q running; then
  echo "starting tunnel for port 2002"
  eval $NAME-2002-up
else
  echo "tunnel for port 2002 already up"
fi

if ! echo "$(eval $NAME-8001-check 2>&1)" | grep -q running; then
  echo "starting tunnel for port 8001"
  eval $NAME-8001-up
else
  echo "tunnel for port 8001 already up"
fi