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author | Achilleas Pipinellis <axil@gitlab.com> | 2018-12-28 08:43:50 +0100 |
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committer | Achilleas Pipinellis <axil@gitlab.com> | 2019-04-03 20:25:57 +0200 |
commit | 7fcd386a6c0255f388183e3f74c652f9f5bbd649 (patch) | |
tree | c6598a19e61ebcc0f0cfa29e2c77a9a33dfedbd9 | |
parent | 14bbc9362af374b7387a475821db5738b9032eb0 (diff) | |
download | gitlab-ce-7fcd386a6c0255f388183e3f74c652f9f5bbd649.tar.gz |
Clean up the mysql to postgres guidedocs/refactor-pgloader
This change refactors the pgloader instructions to have
less headings and be more straightforward.
-rw-r--r-- | doc/update/mysql_to_postgresql.md | 286 |
1 files changed, 139 insertions, 147 deletions
diff --git a/doc/update/mysql_to_postgresql.md b/doc/update/mysql_to_postgresql.md index 350072186ee..b7f7d71689d 100644 --- a/doc/update/mysql_to_postgresql.md +++ b/doc/update/mysql_to_postgresql.md @@ -1,31 +1,58 @@ --- -last_updated: 2018-02-07 +last_updated: 2019-03-27 --- # Migrating from MySQL to PostgreSQL -> **Note:** This guide assumes you have a working GitLab instance with -> MySQL and want to migrate to bundled PostgreSQL database. +This guide documents how to take a working GitLab instance that uses MySQL and +migrate it to a PostgreSQL database. -## Omnibus installation +## Requirements -### Prerequisites +[pgloader](http://pgloader.io) 3.4.1+ is required. -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 -from the old MySQL database to the new PostgreSQL one. +You can install it directly from your distribution, for example in +Debian/Ubuntu: -Here's what you'll need to have installed: +1. Search for the version: -- pgloader 3.4.1+ -- Omnibus GitLab -- MySQL + ```bash + apt-cache madison pgloader + ``` -### Enable bundled PostgreSQL database +1. If the version is 3.4.1+, install it with: + + ```bash + sudo apt-get install pgloader + ``` + + If your distribution's 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 + ``` + +For other distributions, follow the instructions in PostrgreSQL's +[download page](https://www.postgresql.org/download/) to add their repository +and then install `pgloader`. + +## Omnibus GitLab installations + +For [Omnibus GitLab packages](https://about.gitlab.com/install/), you'll first +need to enable the bundled PostgreSQL: 1. Stop GitLab: - ``` bash + ```bash sudo gitlab-ctl stop ``` @@ -40,39 +67,34 @@ Here's what you'll need to have installed: and alike. You could just comment all of them out so that we'll just use the defaults. -1. [Reconfigure GitLab] for the changes to take effect: - - ``` bash - sudo gitlab-ctl reconfigure - ``` - +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: - ``` bash + ```bash sudo gitlab-ctl start unicorn sudo gitlab-ctl start postgresql ``` 1. Run the following commands to prepare the schema: - ``` bash + ```bash sudo gitlab-rake db:create db:migrate ``` 1. Stop Unicorn to prevent other database access from interfering with the loading of data: - ``` bash + ```bash sudo gitlab-ctl stop unicorn ``` 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: +Next, we'll 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 - database `username`, `password` and `host`: + MySQL database `username`, `password` and `host`: ``` LOAD DATABASE @@ -90,7 +112,7 @@ Now, you can use pgloader to migrate the data from MySQL to PostgreSQL: 1. Start the migration: - ``` bash + ```bash sudo -u gitlab-psql pgloader commands.load ``` @@ -117,170 +139,140 @@ Now, you can use pgloader to migrate the data from MySQL to PostgreSQL: 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. + 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 + ```bash sudo gitlab-ctl start ``` -Now, you can verify that everything worked by visiting GitLab. - -### Troubleshooting - -#### 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: - -``` -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: - -``` bash -sudo gitlab-rake cache:clear -``` - -[reconfigure GitLab]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure - -## Source installation +You can now verify that everything works as expected by visiting GitLab. -### Prerequisites +## Source installations -#### Install PostgreSQL and create database +For installations from source that use MySQL, you'll first need to +[install PostgreSQL and create a database](../install/installation.md#6-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 +After the database is created, go on with the following steps: 1. Stop GitLab: - ``` bash - sudo service gitlab stop - ``` + ```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 - ``` + ```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. Install Gems related to Postgresql - ``` bash - sudo -u git -H rm .bundle/config - sudo -u git -H bundle install --deployment --without development test mysql aws kerberos - ``` + ```bash + 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: - ``` bash - sudo -u git -H bundle exec rake db:create db:migrate RAILS_ENV=production - ``` + ```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: +Next, we'll 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`: - ``` - LOAD DATABASE - FROM mysql://username:password@host/gitlabhq_production - INTO postgresql://postgres@unix://var/run/postgresql:/gitlabhq_production + ``` + 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 + 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' + ALTER SCHEMA 'gitlabhq_production' RENAME TO 'public' - ; - ``` + ; + ``` 1. Start the migration: - ``` bash - sudo -u postgres pgloader commands.load - ``` + ```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. + ``` + 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 - ``` + ```bash + 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. -Now, you can verify that everything worked by visiting GitLab. +### Database error permission denied -### Troubleshooting +The PostgreSQL user that you use for the migration MUST have **superuser** privileges. +Otherwise, you may see a similar message to the following: -#### Experiencing 500 errors after the migration +``` +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: -``` bash +```bash +# Omnibus GitLab +sudo gitlab-rake cache:clear + +# Installations from source sudo -u git -H bundle exec rake cache:clear RAILS_ENV=production ``` |