helm: improved commands

Signed-off-by: Sugu Sougoumarane <ssougou@gmail.com>

examples/helm/README.md

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+# Instructions
+
+Detailed instructions for running this example can be found at https://vitess.io.
+This document contains the summary of the commands to be run.
+
+
+```
+# Start minikube
+minikube start --kubernetes-version v1.15.0 --cpus=4 --memory=5000
+
+# Bring up initial cluster and commerce keyspace
+helm install vitess ../../helm/vitess -f 101_initial_cluster.yaml
+
+# Setup aliases
+source alias.source
+
+# Insert and verify data
+vmysql < ../common/insert_commerce_data.sql
+vmysql --table < ../common/select_commerce_data.sql
+
+# Bring up customer keyspace
+helm upgrade vitess ../../helm/vitess/ -f 201_customer_tablets.yaml
+
+# Initiate move tables
+vclient MoveTables -workflow=commerce2customer commerce customer '{"customer":{}, "corder":{}}'
+
+# Cut-over
+vclient SwitchReads -tablet_type=rdonly customer.commerce2customer
+vclient SwitchReads -tablet_type=replica customer.commerce2customer
+vclient SwitchWrites customer.commerce2customer
+
+# Clean-up
+vclient SetShardTabletControl -blacklisted_tables=customer,corder -remove commerce/0 rdonly
+vclient SetShardTabletControl -blacklisted_tables=customer,corder -remove commerce/0 replica
+vclient SetShardTabletControl -blacklisted_tables=customer,corder -remove commerce/0 master
+vclient ApplyRoutingRules -rules='{}'
+
+# Prepare for resharding
+helm upgrade vitess ../../helm/vitess/ -f 301_customer_sharded.yaml
+helm upgrade vitess ../../helm/vitess/ -f 302_new_shards.yaml
+
+# Reshard
+vclient Reshard customer.cust2cust '0' '-80,80-'
+vclient SwitchReads -tablet_type=rdonly customer.cust2cust
+vclient SwitchReads -tablet_type=replica customer.cust2cust
+vclient SwitchWrites customer.cust2cust
+
+# Down shard 0
+helm upgrade vitess ../../helm/vitess/ -f 306_down_shard_0.yaml
+vclient DeleteShard -recursive customer/0
+```

examples/helm/alias.source

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+function vhostport() {
+  vhost=$(minikube service $1 --url=true --format="{{.IP}}" | tail -n 1)
+  vport=$(minikube service $1 --url=true --format="{{.Port}}" | tail -n 1)
+
+  if [ -z $vport ]; then 
+    # This checks K8s running on an single node by kubeadm
+    if [ $(kubectl get nodes | grep -v NAM | wc -l) -eq 1 -o $(kubectl get nodes | grep -v NAM | grep master | wc -l ) -eq 1 ]; then
+      vhost="127.0.0.1"
+      vport=`kubectl describe service vtgate-zone1 | grep NodePort | grep mysql | awk '{print $3}' | awk -F'/' '{print $1}'`
+    fi
+  fi
+}
+
+function vsetmysql() {
+  vhostport vtgate-zone1
+  if [ -z $vport ]; then
+    echo "Error: failed to obtain [host:port] minikube or kubectl."
+    return 1
+  fi
+  echo "Setting alias vmysql to: mysql -h $vhost -P $vport"
+  alias vmysql="mysql -h $vhost -P $vport"
+}
+
+function vsetvclient() {
+  vhostport vtctld
+  if [ -z $vport ]; then
+    echo "Error: failed to: obtain [host:port] minikube or kubectl."
+    return 1
+  fi
+  echo "Setting alias vclient to vtctlclient -server=$vhost:$vport"
+  alias vclient="vtctlclient -server=$vhost:$vport"
+}
+
+vsetmysql
+vsetvclient