308 lines
10 KiB
Markdown
308 lines
10 KiB
Markdown
---
|
|
stage: none
|
|
group: unassigned
|
|
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/#assignments
|
|
---
|
|
|
|
# Migrating from MySQL to PostgreSQL
|
|
|
|
This guide documents how to take a working GitLab instance that uses MySQL and
|
|
migrate it to a PostgreSQL database.
|
|
|
|
## Requirements
|
|
|
|
NOTE:
|
|
Support for MySQL was removed in GitLab 12.1. This procedure should be performed
|
|
**before** installing GitLab 12.1.
|
|
|
|
[pgloader](https://pgloader.io/) 3.4.1+ is required, confirm with `pgloader -V`.
|
|
|
|
You can install it directly from your distribution, for example in
|
|
Debian/Ubuntu:
|
|
|
|
1. Search for the version:
|
|
|
|
```shell
|
|
apt-cache madison pgloader
|
|
```
|
|
|
|
1. If the version is 3.4.1+, install it with:
|
|
|
|
```shell
|
|
sudo apt-get install pgloader
|
|
```
|
|
|
|
If your distribution's version is too old, use PostgreSQL's repository:
|
|
|
|
```shell
|
|
# 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
|
|
```
|
|
|
|
For other distributions, follow the instructions in PostgreSQL's
|
|
[download page](https://www.postgresql.org/download/) to add their repository
|
|
and then install `pgloader`.
|
|
|
|
If you are migrating to a Docker based installation, you must install
|
|
pgloader within the container as it is not included in the container image.
|
|
|
|
1. Start a shell session in the context of the running container:
|
|
|
|
```shell
|
|
docker exec -it gitlab bash
|
|
```
|
|
|
|
1. Install pgloader:
|
|
|
|
```shell
|
|
apt-get update
|
|
apt-get -y install pgloader
|
|
```
|
|
|
|
## Omnibus GitLab installations
|
|
|
|
For [Omnibus GitLab packages](https://about.gitlab.com/install/), you first
|
|
need to enable the bundled PostgreSQL:
|
|
|
|
1. Stop GitLab:
|
|
|
|
```shell
|
|
sudo gitlab-ctl stop
|
|
```
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` to enable bundled PostgreSQL:
|
|
|
|
```ruby
|
|
postgresql['enable'] = true
|
|
```
|
|
|
|
1. Edit `/etc/gitlab/gitlab.rb` to use the bundled PostgreSQL. Review all of the
|
|
settings beginning with `db_` (such as `gitlab_rails['db_adapter']`). To use
|
|
the default values, you can comment all of them out.
|
|
|
|
1. [Reconfigure GitLab](../administration/restart_gitlab.md#omnibus-gitlab-reconfigure)
|
|
for the changes to take effect.
|
|
|
|
1. Start Unicorn and PostgreSQL so that we can prepare the schema:
|
|
|
|
```shell
|
|
sudo gitlab-ctl start unicorn
|
|
sudo gitlab-ctl start postgresql
|
|
```
|
|
|
|
1. Run the following commands to prepare the schema:
|
|
|
|
```shell
|
|
sudo gitlab-rake db:create db:migrate
|
|
```
|
|
|
|
1. Stop Unicorn to prevent other database access from interfering with the loading of data:
|
|
|
|
```shell
|
|
sudo gitlab-ctl stop unicorn
|
|
```
|
|
|
|
After these steps, you have a fresh PostgreSQL database with up-to-date schema.
|
|
|
|
Next, use `pgloader` to migrate the data from the old MySQL database to the
|
|
new PostgreSQL one:
|
|
|
|
1. Save the following snippet in a `commands.load` file, and edit with your
|
|
MySQL database `username`, `password` and `host`:
|
|
|
|
```sql
|
|
LOAD DATABASE
|
|
FROM mysql://username:password@host/gitlabhq_production
|
|
INTO postgresql://gitlab-psql@unix://var/opt/gitlab/postgresql:/gitlabhq_production
|
|
|
|
WITH include no drop, truncate, disable triggers, create no tables,
|
|
create no indexes, preserve index names, no foreign keys,
|
|
data only
|
|
|
|
SET MySQL PARAMETERS
|
|
net_read_timeout = '90',
|
|
net_write_timeout = '180'
|
|
|
|
ALTER SCHEMA 'gitlabhq_production' RENAME TO 'public'
|
|
|
|
;
|
|
```
|
|
|
|
1. Start the migration:
|
|
|
|
```shell
|
|
sudo -u gitlab-psql pgloader commands.load
|
|
```
|
|
|
|
1. Once the migration finishes, you should see a summary table that looks like
|
|
the following:
|
|
|
|
```plaintext
|
|
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:
|
|
|
|
```shell
|
|
sudo gitlab-ctl start
|
|
```
|
|
|
|
You can now verify that everything works as expected by visiting GitLab.
|
|
|
|
## Source installations
|
|
|
|
For installations from source that use MySQL, you must first
|
|
[install PostgreSQL and create a database](../install/installation.md#6-database).
|
|
|
|
After the database is created, go on with the following steps:
|
|
|
|
1. Stop GitLab:
|
|
|
|
```shell
|
|
sudo service gitlab stop
|
|
```
|
|
|
|
1. Switch database from MySQL to PostgreSQL
|
|
|
|
```shell
|
|
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. Install Gems related to PostgreSQL
|
|
|
|
```shell
|
|
sudo -u git -H rm .bundle/config
|
|
sudo -u git -H bundle install --deployment --without development test mysql aws kerberos
|
|
```
|
|
|
|
1. Run the following commands to prepare the schema:
|
|
|
|
```shell
|
|
sudo -u git -H bundle exec rake db:create db:migrate RAILS_ENV=production
|
|
```
|
|
|
|
After these steps, you have a fresh PostgreSQL database with up-to-date schema.
|
|
|
|
Next, use `pgloader` to migrate the data from the old MySQL database to the
|
|
new PostgreSQL one:
|
|
|
|
1. Save the following snippet in a `commands.load` file, and edit with your
|
|
MySQL `username`, `password` and `host`:
|
|
|
|
```sql
|
|
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
|
|
|
|
SET MySQL PARAMETERS
|
|
net_read_timeout = '90',
|
|
net_write_timeout = '180'
|
|
|
|
ALTER SCHEMA 'gitlabhq_production' RENAME TO 'public'
|
|
|
|
;
|
|
```
|
|
|
|
1. Start the migration:
|
|
|
|
```shell
|
|
sudo -u postgres pgloader commands.load
|
|
```
|
|
|
|
1. Once the migration finishes, you should see a summary table that looks like
|
|
the following:
|
|
|
|
```plaintext
|
|
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:
|
|
|
|
```shell
|
|
sudo service gitlab start
|
|
```
|
|
|
|
You can now verify that everything works as expected by visiting GitLab.
|
|
|
|
## Troubleshooting
|
|
|
|
Sometimes, you might encounter some errors during or after the migration.
|
|
|
|
### Database error permission denied
|
|
|
|
The PostgreSQL user that you use for the migration MUST have **superuser** privileges.
|
|
Otherwise, you may see a similar message to the following:
|
|
|
|
```plaintext
|
|
debugger invoked on a CL-POSTGRES-ERROR:INSUFFICIENT-PRIVILEGE in thread
|
|
#<THREAD "lparallel" RUNNING {10078A3513}>:
|
|
Database error 42501: permission denied: "RI_ConstraintTrigger_a_20937" is a system trigger
|
|
QUERY: ALTER TABLE ci_builds DISABLE TRIGGER ALL;
|
|
2017-08-23T00:36:56.782000Z ERROR Database error 42501: permission denied: "RI_ConstraintTrigger_c_20864" is a system trigger
|
|
QUERY: ALTER TABLE approver_groups DISABLE TRIGGER ALL;
|
|
```
|
|
|
|
### Experiencing 500 errors after the migration
|
|
|
|
If you experience 500 errors after the migration, try to clear the cache:
|
|
|
|
```shell
|
|
# Omnibus GitLab
|
|
sudo gitlab-rake cache:clear
|
|
|
|
# Installations from source
|
|
sudo -u git -H bundle exec rake cache:clear RAILS_ENV=production
|
|
```
|