mirror of
https://github.com/marcel-dempers/docker-development-youtube-series.git
synced 2025-06-06 17:01:30 +00:00
62 lines
1.9 KiB
Markdown
62 lines
1.9 KiB
Markdown
# How to replicate PostgreSQL
|
|
|
|
So far we've learnt how to run PostgreSQL as per [chapter 1](../1-introduction/README.md). </br>
|
|
We've also learnt how to configure PostgreSQL with our custom configuration file as per [chapter 2](../2-configuration/README.md). </br>
|
|
|
|
In this chapter we will setup a second PostgreSQL instance. </br>
|
|
Then we will learn how to configure our first PostgreSQL instance to replicate its data to the new second instance. </br>
|
|
This will essentially give us a primary and a secondary server for better availability in case we lose our primary server. </br>
|
|
|
|
|
|
* Documentation on HA \ replication \ failover modes
|
|
|
|
|
|
## Get our Primary PostgreSQL up and running
|
|
|
|
Let's start by running our PostgreSQL in docker </br>
|
|
|
|
Few things to note here: </br>
|
|
* We start our instance with a different name to identify it as the first instance with the `--name postgres-1` flag and `2` for the second instance
|
|
* Set unique data volumes for data between instances
|
|
* Set unique config files for each instance
|
|
* Create and run our docker containers on the same network
|
|
|
|
Create a new network so our instances can talk with each other:
|
|
|
|
```
|
|
docker network create postgres
|
|
```
|
|
|
|
Start with instance 1:
|
|
|
|
```
|
|
cd storage/databases/postgres/3-replication
|
|
|
|
docker run -it --rm --name postgres-1 `
|
|
--net postgres `
|
|
-e POSTGRES_USER=postgresadmin `
|
|
-e POSTGRES_PASSWORD=admin123 `
|
|
-e POSTGRES_DB=postgresdb `
|
|
-e PGDATA="/data" `
|
|
-v ${PWD}/postgres-1/pgdata:/data `
|
|
-v ${PWD}/postgres-1/config:/config `
|
|
-p 5000:5432 `
|
|
postgres:15.0 -c 'config_file=/config/postgresql.conf'
|
|
```
|
|
|
|
Start instance 2:
|
|
|
|
```
|
|
cd storage/databases/postgres/3-replication
|
|
|
|
docker run -it --rm --name postgres-2 `
|
|
--net postgres `
|
|
-e POSTGRES_USER=postgresadmin `
|
|
-e POSTGRES_PASSWORD=admin123 `
|
|
-e POSTGRES_DB=postgresdb `
|
|
-e PGDATA="/data" `
|
|
-v ${PWD}/postgres-2/pgdata:/data `
|
|
-v ${PWD}/postgres-2/config:/config `
|
|
-p 5000:5432 `
|
|
postgres:15.0 -c 'config_file=/config/postgresql.conf'
|
|
``` |