234 lines
8.2 KiB
Markdown
234 lines
8.2 KiB
Markdown
---
|
|
stage: Enablement
|
|
group: Geo
|
|
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
|
|
type: howto
|
|
---
|
|
|
|
# Geo with external PostgreSQL instances **(PREMIUM ONLY)**
|
|
|
|
This document is relevant if you are using a PostgreSQL instance that is *not
|
|
managed by Omnibus*. This includes cloud-managed instances like AWS RDS, or
|
|
manually installed and configured PostgreSQL instances.
|
|
|
|
NOTE: **Note:**
|
|
We strongly recommend running Omnibus-managed instances as they are actively
|
|
developed and tested. We aim to be compatible with most external
|
|
(not managed by Omnibus) databases but we do not guarantee compatibility.
|
|
|
|
## **Primary** node
|
|
|
|
1. SSH into a GitLab **primary** application server and login as root:
|
|
|
|
```shell
|
|
sudo -i
|
|
```
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` and add a **unique** ID for your node (arbitrary value):
|
|
|
|
```ruby
|
|
# The unique identifier for the Geo node.
|
|
gitlab_rails['geo_node_name'] = '<node_name_here>'
|
|
```
|
|
|
|
1. Reconfigure the **primary** node for the change to take effect:
|
|
|
|
```shell
|
|
gitlab-ctl reconfigure
|
|
```
|
|
|
|
1. Execute the command below to define the node as **primary** node:
|
|
|
|
```shell
|
|
gitlab-ctl set-geo-primary-node
|
|
```
|
|
|
|
This command will use your defined `external_url` in `/etc/gitlab/gitlab.rb`.
|
|
|
|
### Configure the external database to be replicated
|
|
|
|
To set up an external database, you can either:
|
|
|
|
- Set up streaming replication yourself (for example, in AWS RDS).
|
|
- Perform the Omnibus configuration manually as follows.
|
|
|
|
#### Leverage your cloud provider's tools to replicate the primary database
|
|
|
|
Given you have a primary node set up on AWS EC2 that uses RDS.
|
|
You can now just create a read-only replica in a different region and the
|
|
replication process will be managed by AWS. Make sure you've set Network ACL, Subnet, and
|
|
Security Group according to your needs, so the secondary application node can access the database.
|
|
|
|
The following instructions detail how to create a read-only replica for common
|
|
cloud providers:
|
|
|
|
- Amazon RDS - [Creating a Read Replica](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html#USER_ReadRepl.Create)
|
|
- Azure Database for PostgreSQL - [Create and manage read replicas in Azure Database for PostgreSQL](https://docs.microsoft.com/en-us/azure/postgresql/howto-read-replicas-portal)
|
|
|
|
Once your read-only replica is set up, you can skip to [configure you secondary application node](#configure-secondary-application-nodes-to-use-the-external-read-replica).
|
|
|
|
#### Manually configure the primary database for replication
|
|
|
|
The [`geo_primary_role`](https://docs.gitlab.com/omnibus/roles/#gitlab-geo-roles)
|
|
configures the **primary** node's database to be replicated by making changes to
|
|
`pg_hba.conf` and `postgresql.conf`. Make the following configuration changes
|
|
manually to your external database configuration and ensure that you restart PostgreSQL
|
|
afterwards for the changes to take effect:
|
|
|
|
```plaintext
|
|
##
|
|
## Geo Primary Role
|
|
## - pg_hba.conf
|
|
##
|
|
host all all <trusted primary IP>/32 md5
|
|
host replication gitlab_replicator <trusted primary IP>/32 md5
|
|
host all all <trusted secondary IP>/32 md5
|
|
host replication gitlab_replicator <trusted secondary IP>/32 md5
|
|
```
|
|
|
|
```plaintext
|
|
##
|
|
## Geo Primary Role
|
|
## - postgresql.conf
|
|
##
|
|
wal_level = hot_standby
|
|
max_wal_senders = 10
|
|
wal_keep_segments = 50
|
|
max_replication_slots = 1 # number of secondary instances
|
|
hot_standby = on
|
|
```
|
|
|
|
## **Secondary** nodes
|
|
|
|
### Manually configure the replica database
|
|
|
|
Make the following configuration changes manually to your `pg_hba.conf` and `postgresql.conf`
|
|
of your external replica database and ensure that you restart PostgreSQL afterwards
|
|
for the changes to take effect:
|
|
|
|
```plaintext
|
|
##
|
|
## Geo Secondary Role
|
|
## - pg_hba.conf
|
|
##
|
|
host all all <trusted secondary IP>/32 md5
|
|
host replication gitlab_replicator <trusted secondary IP>/32 md5
|
|
host all all <trusted primary IP>/24 md5
|
|
```
|
|
|
|
```plaintext
|
|
##
|
|
## Geo Secondary Role
|
|
## - postgresql.conf
|
|
##
|
|
wal_level = hot_standby
|
|
max_wal_senders = 10
|
|
wal_keep_segments = 10
|
|
hot_standby = on
|
|
```
|
|
|
|
### Configure **secondary** application nodes to use the external read-replica
|
|
|
|
With Omnibus, the
|
|
[`geo_secondary_role`](https://docs.gitlab.com/omnibus/roles/#gitlab-geo-roles)
|
|
has three main functions:
|
|
|
|
1. Configure the replica database.
|
|
1. Configure the tracking database.
|
|
1. Enable the [Geo Log Cursor](index.md#geo-log-cursor) (not covered in this section).
|
|
|
|
To configure the connection to the external read-replica database and enable Log Cursor:
|
|
|
|
1. SSH into a GitLab **secondary** application server and login as root:
|
|
|
|
```shell
|
|
sudo -i
|
|
```
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` and add the following
|
|
|
|
```ruby
|
|
##
|
|
## Geo Secondary role
|
|
## - configure dependent flags automatically to enable Geo
|
|
##
|
|
roles ['geo_secondary_role']
|
|
|
|
# note this is shared between both databases,
|
|
# make sure you define the same password in both
|
|
gitlab_rails['db_password'] = '<your_password_here>'
|
|
|
|
gitlab_rails['db_username'] = 'gitlab'
|
|
gitlab_rails['db_host'] = '<database_read_replica_host>'
|
|
|
|
# Disable the bundled Omnibus PostgreSQL, since we are
|
|
# using an external PostgreSQL
|
|
postgresql['enable'] = false
|
|
```
|
|
|
|
1. Save the file and [reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure)
|
|
|
|
### Configure the tracking database
|
|
|
|
**Secondary** nodes use a separate PostgreSQL installation as a tracking
|
|
database to keep track of replication status and automatically recover from
|
|
potential replication issues. Omnibus automatically configures a tracking database
|
|
when `roles ['geo_secondary_role']` is set.
|
|
If you want to run this database external to Omnibus, please follow the instructions below.
|
|
|
|
If you are using a cloud-managed service for the tracking database, you may need
|
|
to grant additional roles to your tracking database user (by default, this is
|
|
`gitlab_geo`):
|
|
|
|
- Amazon RDS requires the [`rds_superuser`](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.PostgreSQL.CommonDBATasks.html#Appendix.PostgreSQL.CommonDBATasks.Roles) role.
|
|
- Azure Database for PostgreSQL requires the [`azure_pg_admin`](https://docs.microsoft.com/en-us/azure/postgresql/howto-create-users#how-to-create-additional-admin-users-in-azure-database-for-postgresql) role.
|
|
|
|
If you have an external database ready to be used as the tracking database,
|
|
follow the instructions below to use it:
|
|
|
|
NOTE: **Note:**
|
|
If you want to use AWS RDS as a tracking database, make sure it has access to
|
|
the secondary database. Unfortunately, just assigning the same security group is not enough as
|
|
outbound rules do not apply to RDS PostgreSQL databases. Therefore, you need to explicitly add an inbound
|
|
rule to the read-replica's security group allowing any TCP traffic from
|
|
the tracking database on port 5432.
|
|
|
|
1. Ensure that your secondary node can communicate with your tracking database by
|
|
manually changing the `pg_hba.conf` that is associated with your tracking database.
|
|
Remember to restart PostgreSQL afterwards for the changes to take effect:
|
|
|
|
```plaintext
|
|
##
|
|
## Geo Tracking Database Role
|
|
## - pg_hba.conf
|
|
##
|
|
host all all <trusted tracking IP>/32 md5
|
|
host all all <trusted secondary IP>/32 md5
|
|
```
|
|
|
|
1. SSH into a GitLab **secondary** server and login as root:
|
|
|
|
```shell
|
|
sudo -i
|
|
```
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` with the connection parameters and credentials for
|
|
the machine with the PostgreSQL instance:
|
|
|
|
```ruby
|
|
geo_secondary['db_username'] = 'gitlab_geo'
|
|
geo_secondary['db_password'] = '<your_password_here>'
|
|
|
|
geo_secondary['db_host'] = '<tracking_database_host>'
|
|
geo_secondary['db_port'] = <tracking_database_port> # change to the correct port
|
|
geo_postgresql['enable'] = false # don't use internal managed instance
|
|
```
|
|
|
|
1. Save the file and [reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure)
|
|
|
|
1. Run the tracking database migrations:
|
|
|
|
```shell
|
|
gitlab-rake geo:db:create
|
|
gitlab-rake geo:db:migrate
|
|
```
|