DUMP / RESTORE PostgreSQL Kubernetes

dump-restore

DUMP
// pod-name         name of the postgres pod
// postgres-user    database user that is able to access the database
// database-name    name of the database
kubectl exec [pod-name] -- bash -c "pg_dump -U [postgres-user] [database-name]" > database.sql

RESTORE
// pod-name         name of the postgres pod
// postgres-user    database user that is able to access the database
// database-name    name of the database
cat database.sql | kubectl exec -i [pod-name] -- psql -U [postgres-user] -d [database-name]

@sudonewdev try this
kubectl exec -i [pod-name] -- psql -U [postgres-user] -d [database-name] -f database.sql
or install psql client with :

sudo apt install postgresql-client-common
sudo apt-get install -y postgresql-client

then :
psql -U [postgres-user] -p [database-port] -h [postgres-ip] -d [database-name] -f database.sql