Good morning, I have the following distribution in the moment
in my application I have a server.xml that
<Realm className = "org.apache.catalina.realm.LockOutRealm">
<Realm className = "org.apache.catalina.realm.JDBCRealm" connectionURL = "jdbc: sqlserver: //xxxx.database.windows.net:1433; database = demo1; user = xxx @ xxx; password =` `; encrypt = true; trustServerCertificate = true; hostNameInCertificate = *. database.windows.net; loginTimeout = 30; " driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver" roleNameCol = "role" userCredCol = "password" userNameCol = "login" userRoleTable = "userRole" userTable = "v_login" />
</ Realm>which references my database and through this makes the connection .... its that okay.
However I was using for each bank an image changing these parameters, but now I want to have only one image and change the parameter externally
I searched a lot and did not find a way to change these parameters externally (in deploy.yaml or service.yaml)
I need your help
You can pass command line arguments in your deployment yaml: .spec.template.spec.containers[0].args. This is an array of strings, every string is a command line argument to your executable.
Example:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-deployment
namespace: default
labels:
app: my-app
spec:
selector:
matchLabels:
app: my-app
replicas: 2
template:
metadata:
labels:
app: my-app
spec:
containers:
- image: my-image
name: my-app
args: [
"argument-1",
"argument-2"
]
Dont bake the jdbc url inside your docker image. Externalize those using environment variables. Tomcat supports java system property interpolation inside server.xml. you need to use catalina_opts to set the java system property from environment variables.
check this post evironment/system variables in server.xml.
Another thing, use configmap and/or secrets to set the env variables into the deployment https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#define-container-environment-variables-using-configmap-data