WIP: Add a Cassandra Demo

demo.sh

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+# First we create a project namespace
+kubectl create ns project-x
+
+# Now we install navigator in that namespace
+helm \
+    --debug \
+    install \
+    --wait \
+    --name navigator \
+    --namespace project-x \
+    --set apiserver.image.repository=gcr.io/jetstack-sandbox/navigator-apiserver \
+    --set controller.image.repository=gcr.io/jetstack-sandbox/navigator-controller \
+    contrib/charts/navigator
+
+# Let's see what's been installed
+kubectl get all --namespace project-x
+kubectl get clusterrolebinding --namespace project-x | grep navigator
+
+# And let's take a look at the Navigator logs
+# First the apiserver logs
+kubectl --namespace project-x logs -c apiserver deploy/navigator-navigator-apiserver
+
+# And then the controller logs
+kubectl --namespace project-x logs deploy/navigator-navigator-controller
+
+# Now that Navigator is running we can start a Cassandra single node cluster, using Helm.
+helm install \
+     --debug \
+     --wait \
+     --name "cc-1" \
+     --namespace "project-x" \
+     --set pilotImage.repository=gcr.io/jetstack-sandbox/navigator-pilot-cassandra \
+     --set replicaCount=1 \
+     contrib/charts/cassandra
+
+# Let's take a quick look at the CassandraCluster resource
+kubectl --namespace project-x get cassandraclusters --output yaml
+
+# And let's see what other resources have been created
+kubectl --namespace project-x get all
+
+# We can look at the cassandra database logs
+kubectl --namespace project-x logs statefulsets/cass-cc-1-cassandra-ringnodes
+
+# Now we'll connect to Cassandra and run some queries
+# (We'll use telepresence to allow us to run cqlsh as if we are in the project-x namespace)
+telepresence --run-shell --namespace project-x
+
+# There's a service which loadbalances CQL connections between all the Cassandra nodes.
+cqlsh --cqlversion=3.4.2 cass-cc-1-cassandra-cql 9042
+
+TRACING ON
+SHOW VERSION
+SHOW HOST
+DESCRIBE CLUSTER
+
+# Now let's scale up the cluster
+# We use Helm to increment the replica count
+helm upgrade \
+     --debug \
+     "cc-1" \
+     contrib/charts/cassandra \
+     --set pilotImage.repository=gcr.io/jetstack-sandbox/navigator-pilot-cassandra \
+     --set replicaCount=2
+
+# Run the node tool to see the cluster status
+kubectl --namespace project-x exec cass-cc-1-cassandra-ringnodes-0 -- nodetool status
+
+
+-- Database example is copied from:
+-- http://blog.mclaughlinsoftware.com/2017/07/30/cassandra-query-language/
+-- Create a database
+DROP KEYSPACE IF EXISTS student;
+
+CREATE KEYSPACE IF NOT EXISTS student
+  WITH REPLICATION = {
+     'class':'SimpleStrategy'
+    ,'replication_factor': 2 }
+  AND DURABLE_WRITES = true;
+
+USE student;
+
+-- See the ranges distributed to both nodes
+DESCRIBE CLUSTER
+
+-- Create some data
+CONSISTENCY ALL
+
+DROP TABLE IF EXISTS member;
+
+CREATE TABLE member
+( member_number       VARCHAR
+, member_type         VARCHAR
+, credit_card_number  VARCHAR
+, credit_card_type    VARCHAR
+, PRIMARY KEY ( member_number ));
+
+DROP TABLE IF EXISTS contact;
+
+CREATE TABLE contact
+( contact_number      VARCHAR
+, contact_type        VARCHAR
+, first_name          VARCHAR
+, middle_name         VARCHAR
+, last_name           VARCHAR
+, member_number       VARCHAR
+, PRIMARY KEY ( contact_number ));
+
+INSERT INTO member
+( member_number, member_type, credit_card_number, credit_card_type )
+VALUES
+('SFO-12345','GROUP','2222-4444-5555-6666','VISA');
+
+INSERT INTO contact
+( contact_number, contact_type, first_name, middle_name, last_name, member_number )
+VALUES
+('CUS_00001','FAMILY','Barry', NULL,'Allen','SFO-12345');
+
+INSERT INTO contact
+( contact_number, contact_type, first_name, middle_name, last_name, member_number )
+VALUES
+('CUS_00002','FAMILY','Iris', NULL,'West-Allen','SFO-12345');
+
+INSERT INTO member
+( member_number, member_type, credit_card_number, credit_card_type )
+VALUES
+('SFO-12346','GROUP','3333-8888-9999-2222','VISA');
+
+INSERT INTO contact
+( contact_number, contact_type, first_name, middle_name, last_name, member_number )
+VALUES
+('CUS_00003','FAMILY','Caitlin','Marie','Snow','SFO-12346');
+
+SELECT * FROM member;
+
+# We can simulate an unresponsive node and see how the Readiness and Liveness probes detect the problem and restart the node.
+# Stop one of the cassandra processes.
+kubectl --namespace project-x  exec cass-cc-1-cassandra-ringnodes-0 -- bash -c 'kill -SIGSTOP -- $(ps -u cassandra -o pid=)'
+
+# Nodetool now reports a node Down
+kubectl --namespace project-x  exec cass-cc-1-cassandra-ringnodes-1 -- nodetool status
+
+# And kubernetes reports that one of the pods is "unready"
+kubectl --namespace project-x get pods
+
+# Cleanup
+helm delete --purge cc-1 navigator
+kubectl delete ns --now project-x