Unable to connect tomcat container to mariadb database container in kubernetes? - mysql

Question

Tomcat and mariadb services are up and running and pinging was happening from tomcat service to mariadb service but not communicating from db to tomcat using ping command. attached my scripts for troubleshooting issue-----------------------------
tomcat deployment
apiVersion: apps/v1
kind: Deployment
metadata:
name: xyzapp-tomcat
spec:
selector:
matchLabels:
app: xyzapp-tomcat
tier: backend
track: stable
template:
metadata:
labels:
app: xyzapp-tomcat
tier: backend
track: stable
spec:
containers:
- name: xyzapp-tomcat
image: xyz/xyz:tomcat
env:
- name: MYSQL_SERVICE_HOST
value: "xyzapp-mariadb"
- name: MYSQL_SERVICE_PORT
value: "3306"
#- name: DB_PORT_3306_TCP_ADDR
#value: xyzapp-mariadb #service name of mysql
- name: MYSQL_DATABASE
value: xyzapp
- name: MYSQL_USER
value: student
- name: MYSQL_PASSWORD
value: student
ports:
- name: http
containerPort: 8080
database deployment.yml
apiVersion: v1
kind: Service
metadata:
name: xyzapp-mariadb
labels:
app: xyzapp
spec:
ports:
- port: 3306
selector:
app: xyzapp
tier: mariadb
clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: xyzapp-mariadb
labels:
app: xyzapp
spec:
selector:
matchLabels:
app: xyzapp
tier: mariadb
strategy:
type: Recreate
template:
metadata:
labels:
app: xyzapp
tier: mariadb
spec:
containers:
- image: mariadb
name: xyzapp-mariadb
env:
- name: MYSQL_ROOT_PASSWORD
value: password
- name: MYSQL_DATABASE
value: xyzapp
- name: MYSQL_USER
value: student
- name: MYSQL_PASSWORD
value: student
args: ["--default-authentication-plugin=mysql_native_password"]
ports:
- containerPort: 3306
volumeMounts:
- name: mariadb-init
mountPath: /docker-entrypoint-initdb.d
volumes:
- name: mariadb-init
persistentVolumeClaim:
claimName: xyzapp-initdb-pv-claim
tomcat logs:
05-May-2020 11:48:53.486 WARNING [main] org.apache.tomcat.util.scan.StandardJarScanner.processURLs Failed to scan [file:/usr/local/tomcat/lib/mysql-connector-java-8.0.20.jar] from classloader hierarchy
JDBC mapped context.xml:
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource" maxTotal="100" maxIdle="30" maxWaitMillis="10000" username="$MYSQL_USER" password="$MYSQL_PASSWORD" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://$MYSQL_SERVICE_HOST:$MYSQL_SERVICE_PORT/$MYSQL_DATABASE"/>