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Add recipe to set up PostgreSQL replication, rewrite kosmos-postgresql cookbook #163

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raucao merged 17 commits from feature/160-postgres_replication into master 2020-05-14 13:10:37 +00:00
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site-cookbooks/kosmos-postgresql/README.md
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# kosmos-postgresql
## Custom resources
## Usage
### `postgresql_custom_server`
### On the primary:
raucao commented 2020-05-12 09:07:08 +00:00
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What's "custom" about these servers? If "custom" merely means that it's going to be configured for our use case, then isn't that the case for literally every other server, too?

What's "custom" about these servers? If "custom" merely means that it's going to be configured for our use case, then isn't that the case for literally every other server, too?
greg commented 2020-05-12 13:59:32 +00:00
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They're Chef custom resources (https://docs.chef.io/custom_resources/), the concept that replaces LWRP (https://chef.readthedocs.io/en/latest/lwrps_custom.html)

They're Chef custom resources (https://docs.chef.io/custom_resources/), the concept that replaces LWRP (https://chef.readthedocs.io/en/latest/lwrps_custom.html)
Usage:
Set the `postgresql_primary` role on the node
(`node['fqdn']`, for example `andromeda.kosmos.org`) is generated using Let's
Encrypt and copied to the PostgreSQL data directory and added to the
`postgresql.conf` file
#### On the primary:
```ruby
postgresql_custom_server "12" do
role "primary"
end
```
#### On a replica:
```ruby
postgresql_custom_server "12" do
role "replica"
end
```
### On the replica:
Add the `postgresql_replica` role to the node's run list. Run Chef on the node
a first time.
After the initial Chef run on the replica, run Chef on the primary to add the
firewall rules and PostgreSQL access rules, then run Chef again on the replica
to set up replication.
#### Caveat
## Caveat
[`firewall_rules`](https://github.com/chef-cookbooks/firewall/issues/134) and
[`postgresql_access`](https://github.com/sous-chefs/postgresql/issues/648) are