ZDM-295 Enhance docker-compose components

* Created Dockerfiles for jumphost, proxy, and client
* Migrated installation of packages and user setup from docker-entrypoint into
  Dockerfile for jumphost, proxy, and client
* Increased retry sleep time to 20s for jumphost's ssh connection test,
  and key scan
* Increased retry sleep time to 20s for proxy's ssh key check
* Added functionality to jumphost to detect container names and ip address of
  proxy, origin (Cassandra node), and target (Cassandra node) containers and
  record information to a shared hosts file
* Added functionality to client to read ip address information of proxies and
  Cassandra nodes from shared hosts file
* Updated test carried out by client to initially insert data into the
  Cassandra origin node, then every minute insert data via the ZDM proxy, read
  data back via ZDM proxy, and then read data back directly from each
  Cassandra node
* Fixed issue where ansible will fail to provision proxy hosts if less than
  three existed by making the jumphost dynamically generate the
  zdm_ansible_inventory file

.env

@@ -0,0 +1 @@
+NETWORK_SUBNET=192.168.100.0/24

docker-compose.yml

@@ -7,56 +7,60 @@ networks:
     ipam:
       driver: default
       config:
-        - subnet: 192.168.100.0/24
+        - subnet: $NETWORK_SUBNET
 
 services:
   origin:
     image: cassandra:3.11
     restart: unless-stopped
+    environment:
+      - CASSANDRA_CLUSTER_NAME='origin_cluster'
+      - CASSANDRA_NUM_TOKENS=32
+      - CASSANDRA_DC=datacenter1
+      - CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch
     networks:
       proxy:
 
   target:
     image: cassandra:4.0
     restart: unless-stopped
+    environment:
+      - CASSANDRA_CLUSTER_NAME='target_cluster'
+      - CASSANDRA_DC=datacenter1
+      - CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch
     networks:
       proxy:
 
   proxy:
-    image: thesoul/ubuntu-dind:docker-20.10.12
+    build: ./docker-compose/services/proxy
     restart: unless-stopped
     tty: true
     privileged: true
     volumes:
-      - .:/opt/zdm-proxy-automation
-      - ./compose/keys:/run/keys
-    entrypoint:
-      - /opt/zdm-proxy-automation/compose/proxy-entrypoint.sh
+      - ./docker-compose/services/proxy/proxy-entrypoint.sh:/usr/bin/proxy-entrypoint.sh
+      - ./docker-compose/share:/run/zdm-proxy-automation/
     networks:
       proxy:
-    deploy:
-      mode: replicated
-      replicas: 3
 
   jumphost:
-    image: ubuntu:20.04
+    build: ./docker-compose/services/jumphost
     restart: unless-stopped
     tty: true
+    environment:
+      - CIDR_IP_SUBNET=$NETWORK_SUBNET
     volumes:
-      - .:/opt/zdm-proxy-automation
-      - ./compose/keys:/run/keys
-    entrypoint:
-      - /opt/zdm-proxy-automation/compose/jumphost-entrypoint.sh
+      - ./docker-compose/services/jumphost/jumphost-entrypoint.sh:/usr/bin/jumphost-entrypoint.sh
+      - ./docker-compose/share:/run/zdm-proxy-automation/
+      - ./ansible/:/opt/zdm-proxy-automation/ansible/
     networks:
       proxy:
 
   client:
-    image: ubuntu:20.04
+    build: ./docker-compose/services/client
     restart: unless-stopped
     tty: true
     volumes:
-      - .:/opt/zdm-proxy-automation
-    entrypoint:
-      - /opt/zdm-proxy-automation/compose/client-entrypoint.sh
+      - ./docker-compose/services/client/client-entrypoint.sh:/usr/bin/client-entrypoint.sh
+      - ./docker-compose/share:/run/zdm-proxy-automation/
     networks:
       proxy:

docker-compose/services/client/Dockerfile

@@ -0,0 +1,23 @@
+FROM ubuntu:20.04
+
+ENV ZDM_PROXY_RUN /run/zdm-proxy-automation
+ENV HOSTS_FILE ${ZDM_PROXY_RUN}/hostsfile
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive \
+    apt-get -y install \
+        iproute2 \
+        net-tools \
+        iputils-ping \
+        python3 \
+        python3-pip \
+        tzdata
+
+RUN python3 -m pip install -U cqlsh
+
+# Fix timezone in client 
+RUN ln -fs /usr/share/zoneinfo/Australia/Sydney /etc/localtime && \
+    dpkg-reconfigure -f noninteractive tzdata
+
+ENTRYPOINT ["client-entrypoint.sh"]
+CMD [""]