How to run db migration script in a kubernetes pod from bash?

Question

I would like to run database migration scripts in Ubuntu pod automatically.

How I am doing this manually:

$ kubectl run -i --tty ubuntu --image=ubuntu:focal -- bash
$ apt install -y postgresql-client
$ psql "hostaddr=addr port=5432 user=username password=pass dbname=dbname"

COPY persons(first_name, last_name, dob, email)
FROM './persons.csv'
DELIMITER ','
CSV HEADER;

$ exit

I would like to create a bash script for this purposes to run locally. Could you please advise how to script it? First command connects to a remote bash session, and I am not able to execute other commands. Definitely doing something wrong.

Thank you.

Answer 1

Use here documents.

#!/bin/bash
kubectl run -i --tty ubuntu --image=ubuntu:focal -- bash <<EOF
apt install -y postgresql-client
psql "hostaddr=addr port=5432 user=username password=pass dbname=dbname" <<EOF2

COPY persons(first_name, last_name, dob, email)
FROM './persons.csv'
DELIMITER ','
CSV HEADER;

EOF2
EOF