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Commit 1d698113 authored by Stan Hu's avatar Stan Hu
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Merge branch 'patch-11' into 'master' 

Add instructions for source installation to mysql_to_postgresql.md

See merge request gitlab-org/gitlab-ce!16983
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---
last_updated: 2017-10-05
last_updated: 2018-02-07
---
 
# Migrating from MySQL to PostgreSQL
 
> **Note:** This guide assumes you have a working Omnibus GitLab instance with
> **Note:** This guide assumes you have a working GitLab instance with
> MySQL and want to migrate to bundled PostgreSQL database.
 
## Prerequisites
## Omnibus installation
### Prerequisites
 
First, we'll need to enable the bundled PostgreSQL database with up-to-date
schema. Next, we'll use [pgloader](http://pgloader.io) to migrate the data
@@ -19,7 +21,7 @@ Here's what you'll need to have installed:
- Omnibus GitLab
- MySQL
 
## Enable bundled PostgreSQL database
### Enable bundled PostgreSQL database
 
1. Stop GitLab:
 
@@ -65,7 +67,7 @@ Here's what you'll need to have installed:
 
After these steps, you'll have a fresh PostgreSQL database with up-to-date schema.
 
## Migrate data from MySQL to PostgreSQL
### Migrate data from MySQL to PostgreSQL
 
Now, you can use pgloader to migrate the data from MySQL to PostgreSQL:
 
@@ -104,122 +106,9 @@ the following:
----------------------------------------------- --------- --------- --------- --------------
public.abuse_reports 0 0 0 0.490s
public.appearances 0 0 0 0.488s
public.approvals 0 0 0 0.273s
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.
.
.
public.web_hook_logs 0 0 0 1.080s
----------------------------------------------- --------- --------- --------- --------------
COPY Threads Completion 4 4 0 2.008s
@@ -240,9 +129,9 @@ the following:
 
Now, you can verify that everything worked by visiting GitLab.
 
## Troubleshooting
### Troubleshooting
 
### Permissions
#### Permissions
 
Note that the PostgreSQL user that you use for the above MUST have **superuser** privileges. Otherwise, you may see
a similar message to the following:
@@ -256,7 +145,7 @@ debugger invoked on a CL-POSTGRES-ERROR:INSUFFICIENT-PRIVILEGE in thread
QUERY: ALTER TABLE approver_groups DISABLE TRIGGER ALL;
```
 
### Experiencing 500 errors after the migration
#### Experiencing 500 errors after the migration
 
If you experience 500 errors after the migration, try to clear the cache:
 
@@ -265,3 +154,130 @@ sudo gitlab-rake cache:clear
```
 
[reconfigure GitLab]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure
## Source installation
### Prerequisites
#### Install PostgreSQL and create database
See [installation guide](../install/installation.md#6-database).
#### Install [pgloader](http://pgloader.io) 3.4.1+
Install directly from your distro:
``` bash
sudo apt-get install pgloader
```
If this version is too old, use PostgreSQL's repository:
``` bash
# add repository
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
# add key
sudo apt-get install wget ca-certificates
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
# install package
sudo apt-get update
sudo apt-get install pgloader
```
### Enable bundled PostgreSQL database
1. Stop GitLab:
``` bash
sudo service gitlab stop
```
1. Switch database from MySQL to PostgreSQL
``` bash
cd /home/git/gitlab
sudo -u git mv config/database.yml config/database.yml.bak
sudo -u git cp config/database.yml.postgresql config/database.yml
sudo -u git -H chmod o-rwx config/database.yml
```
1. Run the following commands to prepare the schema:
``` bash
sudo -u git -H bundle exec rake db:create db:migrate RAILS_ENV=production
```
After these steps, you'll have a fresh PostgreSQL database with up-to-date schema.
### Migrate data from MySQL to PostgreSQL
Now, you can use pgloader to migrate the data from MySQL to PostgreSQL:
1. Save the following snippet in a `commands.load` file, and edit with your
MySQL `username`, `password` and `host`:
```
LOAD DATABASE
FROM mysql://username:password@host/gitlabhq_production
INTO postgresql://postgres@unix://var/run/postgresql:/gitlabhq_production
WITH include no drop, truncate, disable triggers, create no tables,
create no indexes, preserve index names, no foreign keys,
data only
ALTER SCHEMA 'gitlabhq_production' RENAME TO 'public'
;
```
1. Start the migration:
``` bash
sudo -u postgres pgloader commands.load
```
1. Once the migration finishes, you should see a summary table that looks like
the following:
```
table name read imported errors total time
----------------------------------------------- --------- --------- --------- --------------
fetch meta data 119 119 0 0.388s
Truncate 119 119 0 1.134s
----------------------------------------------- --------- --------- --------- --------------
public.abuse_reports 0 0 0 0.490s
public.appearances 0 0 0 0.488s
.
.
.
public.web_hook_logs 0 0 0 1.080s
----------------------------------------------- --------- --------- --------- --------------
COPY Threads Completion 4 4 0 2.008s
Reset Sequences 113 113 0 0.304s
Install Comments 0 0 0 0.000s
----------------------------------------------- --------- --------- --------- --------------
Total import time 1894 1894 0 12.497s
```
If there is no output for more than 30 minutes, it's possible pgloader encountered an error. See
the [troubleshooting guide](#Troubleshooting) for more details.
1. Start GitLab:
``` bash
sudo service gitlab start
```
Now, you can verify that everything worked by visiting GitLab.
### Troubleshooting
#### Experiencing 500 errors after the migration
If you experience 500 errors after the migration, try to clear the cache:
``` bash
sudo -u git -H bundle exec rake cache:clear RAILS_ENV=production
```
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