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container.training/prepare-eks/80_s3_bucket.sh
2021-03-28 15:36:25 +02:00

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#!/bin/sh
# Create an S3 bucket with two objects in it:
# - public.txt (world-readable)
# - private.txt (private)
# Also create an IAM policy granting read-only access to the bucket
# (and therefore, to the private object).
# Finally, attach the policy to an IAM role (for instance, the role
# created by another script in this directory).
# This isn't idempotent, but it can be made idempotent by replacing the
# "aws iam create-policy" call with "aws iam create-policy-version" and
# a bit of extra elbow grease. (See other scripts in this directory for
# an example).
ACCOUNT=$(aws sts get-caller-identity | jq -r .Account)
BUCKET=container.training
ROLE_NAME=s3-reader-container-training
POLICY_NAME=s3-reader-container-training
POLICY_DOC=$(envsubst <<EOF
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:ListBucket",
"s3:GetObject*"
],
"Resource": [
"arn:aws:s3:::$BUCKET",
"arn:aws:s3:::$BUCKET/*"
]
}
]
}
EOF
)
aws iam create-policy \
--policy-name $POLICY_NAME \
--policy-doc "$POLICY_DOC"
aws s3 mb s3://container.training
echo "this is a public object" \
| aws s3 cp - s3://container.training/public.txt \
--acl public-read
echo "this is a private object" \
| aws s3 cp - s3://container.training/private.txt \
--acl private
aws iam attach-role-policy \
--role-name "$ROLE_NAME" \
--policy-arn arn:aws:iam::$ACCOUNT:policy/$POLICY_NAME