First create an IAM programmatic user which has permissions to s3 from AWS console. Note down the access ID and the secret KEY
Now, lets configure AWS CLI in the server.
To install the CLI in CentOS 7 lets do this :
sudo yum -y install python-pip sudo pip install --upgrade pip sudo pip install awscli
If its CentOS 8, you can do this :
sudo dnf install -y python3 python3-pip sudo pip3 install awscli
Now, using the following command configure AWS :
Enter the access ID and secret key and the region.
Now, the AWS cli is configured. Lets move the files to bucket. If you have already created the bucket, ignore the following or create the bucket using the following command :
aws s3 mb s3://bucketname
If you have already created the bucket and if you know the bucket name, do this :
aws s3 sync /pathtothefolder/ s3://bucket-name
The files would be uploaded to the bucket