| # these make the ec2 commands just work | |
| export AWS_ACCESS_KEY=[AWS access key] | |
| export AWS_SECRET_KEY=[AWS secret] | |
| # fetch the instance id | |
| export INSTANCE_ID=$(wget -q -O - http://169.254.169.254/latest/meta-data/instance-id) | |
| #grep out the tag you're looking for, in this case "Name" | |
| export APP_TAG=$(ec2-describe-tags | grep $INSTANCE_ID | grep -oE "Name\\W+(.+)$" | grep -oE "\\W.+$") |
WAL-E needs to be installed on all machines, masters and slaves.
Only one machine, the master, writes WAL segments via continuous archiving. The configuration for the master postgresql.conf is:
archive_mode = on
archive_command = 'envdir /etc/wal-e.d/env wal-e wal-push %p'
archive_timeout = 60