267 lines
16 KiB
Markdown
267 lines
16 KiB
Markdown
---
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last_updated: 2017-10-05
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---
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# Migrating from MySQL to PostgreSQL
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> **Note:** This guide assumes you have a working Omnibus GitLab instance with
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> MySQL and want to migrate to bundled PostgreSQL database.
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## Prerequisites
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First, we'll need to enable the bundled PostgreSQL database with up-to-date
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schema. Next, we'll use [pgloader](http://pgloader.io) to migrate the data
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from the old MySQL database to the new PostgreSQL one.
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Here's what you'll need to have installed:
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- pgloader 3.4.1+
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- Omnibus GitLab
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- MySQL
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## Enable bundled PostgreSQL database
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1. Stop GitLab:
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``` bash
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sudo gitlab-ctl stop
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```
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1. Edit `/etc/gitlab/gitlab.rb` to enable bundled PostgreSQL:
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```
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postgresql['enable'] = true
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```
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1. Edit `/etc/gitlab/gitlab.rb` to use the bundled PostgreSQL. Please check
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all the settings beginning with `db_`, such as `gitlab_rails['db_adapter']`
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and alike. You could just comment all of them out so that we'll just use
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the defaults.
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1. [Reconfigure GitLab] for the changes to take effect:
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``` bash
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sudo gitlab-ctl reconfigure
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```
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1. Start Unicorn and PostgreSQL so that we can prepare the schema:
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``` bash
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sudo gitlab-ctl start unicorn
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sudo gitlab-ctl start postgresql
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```
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1. Run the following commands to prepare the schema:
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``` bash
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sudo gitlab-rake db:create db:migrate
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```
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1. Stop Unicorn to prevent other database access from interfering with the loading of data:
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``` bash
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sudo gitlab-ctl stop unicorn
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```
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After these steps, you'll have a fresh PostgreSQL database with up-to-date schema.
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## Migrate data from MySQL to PostgreSQL
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Now, you can use pgloader to migrate the data from MySQL to PostgreSQL:
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1. Save the following snippet in a `commands.load` file, and edit with your
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database `username`, `password` and `host`:
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```
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LOAD DATABASE
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FROM mysql://username:password@host/gitlabhq_production
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INTO postgresql://gitlab-psql@unix://var/opt/gitlab/postgresql:/gitlabhq_production
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WITH include no drop, truncate, disable triggers, create no tables,
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create no indexes, preserve index names, no foreign keys,
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data only
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ALTER SCHEMA 'gitlabhq_production' RENAME TO 'public'
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;
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```
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1. Start the migration:
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``` bash
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sudo -u gitlab-psql pgloader commands.load
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```
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1. Once the migration finishes, you should see a summary table that looks like
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the following:
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```
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table name read imported errors total time
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----------------------------------------------- --------- --------- --------- --------------
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fetch meta data 119 119 0 0.388s
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Truncate 119 119 0 1.134s
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----------------------------------------------- --------- --------- --------- --------------
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public.abuse_reports 0 0 0 0.490s
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public.appearances 0 0 0 0.488s
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public.approvals 0 0 0 0.273s
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public.application_settings 1 1 0 0.266s
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public.approvers 0 0 0 0.339s
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public.approver_groups 0 0 0 0.357s
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public.audit_events 1 1 0 0.410s
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public.award_emoji 0 0 0 0.441s
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public.boards 0 0 0 0.505s
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public.broadcast_messages 0 0 0 0.498s
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public.chat_names 0 0 0 0.576s
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public.chat_teams 0 0 0 0.617s
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public.ci_builds 0 0 0 0.611s
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public.ci_group_variables 0 0 0 0.620s
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public.ci_pipelines 0 0 0 0.599s
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public.ci_pipeline_schedules 0 0 0 0.622s
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public.ci_pipeline_schedule_variables 0 0 0 0.573s
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public.ci_pipeline_variables 0 0 0 0.594s
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public.ci_runners 0 0 0 0.533s
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public.ci_runner_projects 0 0 0 0.584s
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public.ci_sources_pipelines 0 0 0 0.564s
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public.ci_stages 0 0 0 0.595s
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public.ci_triggers 0 0 0 0.569s
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public.ci_trigger_requests 0 0 0 0.596s
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public.ci_variables 0 0 0 0.565s
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public.container_repositories 0 0 0 0.605s
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public.conversational_development_index_metrics 0 0 0 0.571s
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public.deployments 0 0 0 0.607s
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public.emails 0 0 0 0.602s
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public.deploy_keys_projects 0 0 0 0.557s
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public.events 160 160 0 0.677s
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public.environments 0 0 0 0.567s
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public.features 0 0 0 0.639s
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public.events_for_migration 160 160 0 0.582s
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public.feature_gates 0 0 0 0.579s
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public.forked_project_links 0 0 0 0.660s
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public.geo_nodes 0 0 0 0.686s
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public.geo_event_log 0 0 0 0.626s
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public.geo_repositories_changed_events 0 0 0 0.677s
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public.geo_node_namespace_links 0 0 0 0.618s
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public.geo_repository_renamed_events 0 0 0 0.696s
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public.gpg_keys 0 0 0 0.704s
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public.geo_repository_deleted_events 0 0 0 0.638s
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public.historical_data 0 0 0 0.729s
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public.geo_repository_updated_events 0 0 0 0.634s
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public.index_statuses 0 0 0 0.746s
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public.gpg_signatures 0 0 0 0.667s
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public.issue_assignees 80 80 0 0.769s
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public.identities 0 0 0 0.655s
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public.issue_metrics 80 80 0 0.781s
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public.issues 80 80 0 0.720s
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public.labels 0 0 0 0.795s
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public.issue_links 0 0 0 0.707s
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public.label_priorities 0 0 0 0.793s
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public.keys 0 0 0 0.734s
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public.lfs_objects 0 0 0 0.812s
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public.label_links 0 0 0 0.725s
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public.licenses 0 0 0 0.813s
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public.ldap_group_links 0 0 0 0.751s
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public.members 52 52 0 0.830s
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public.lfs_objects_projects 0 0 0 0.738s
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public.merge_requests_closing_issues 0 0 0 0.825s
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public.lists 0 0 0 0.769s
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public.merge_request_diff_commits 0 0 0 0.840s
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public.merge_request_metrics 0 0 0 0.837s
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public.merge_requests 0 0 0 0.753s
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public.merge_request_diffs 0 0 0 0.771s
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public.namespaces 30 30 0 0.874s
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public.merge_request_diff_files 0 0 0 0.775s
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public.notes 0 0 0 0.849s
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public.milestones 40 40 0 0.799s
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public.oauth_access_grants 0 0 0 0.979s
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public.namespace_statistics 0 0 0 0.797s
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public.oauth_applications 0 0 0 0.899s
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public.notification_settings 72 72 0 0.818s
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public.oauth_access_tokens 0 0 0 0.807s
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public.pages_domains 0 0 0 0.958s
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public.oauth_openid_requests 0 0 0 0.832s
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public.personal_access_tokens 0 0 0 0.965s
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public.projects 8 8 0 0.987s
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public.path_locks 0 0 0 0.925s
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public.plans 0 0 0 0.923s
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public.project_features 8 8 0 0.985s
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public.project_authorizations 66 66 0 0.969s
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public.project_import_data 8 8 0 1.002s
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public.project_statistics 8 8 0 1.001s
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public.project_group_links 0 0 0 0.949s
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public.project_mirror_data 0 0 0 0.972s
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public.protected_branch_merge_access_levels 0 0 0 1.017s
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public.protected_branches 0 0 0 0.969s
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public.protected_branch_push_access_levels 0 0 0 0.991s
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public.protected_tags 0 0 0 1.009s
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public.protected_tag_create_access_levels 0 0 0 0.985s
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public.push_event_payloads 0 0 0 1.041s
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public.push_rules 0 0 0 0.999s
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public.redirect_routes 0 0 0 1.020s
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public.remote_mirrors 0 0 0 1.034s
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public.releases 0 0 0 0.993s
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public.schema_migrations 896 896 0 1.057s
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public.routes 38 38 0 1.021s
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public.services 0 0 0 1.055s
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public.sent_notifications 0 0 0 1.003s
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public.slack_integrations 0 0 0 1.022s
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public.spam_logs 0 0 0 1.024s
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public.snippets 0 0 0 1.058s
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public.subscriptions 0 0 0 1.069s
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public.taggings 0 0 0 1.099s
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public.timelogs 0 0 0 1.104s
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public.system_note_metadata 0 0 0 1.038s
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public.tags 0 0 0 1.034s
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public.trending_projects 0 0 0 1.140s
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public.uploads 0 0 0 1.129s
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public.todos 80 80 0 1.085s
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public.users_star_projects 0 0 0 1.153s
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public.u2f_registrations 0 0 0 1.061s
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public.web_hooks 0 0 0 1.179s
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public.users 26 26 0 1.163s
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public.user_agent_details 0 0 0 1.068s
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public.web_hook_logs 0 0 0 1.080s
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----------------------------------------------- --------- --------- --------- --------------
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COPY Threads Completion 4 4 0 2.008s
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Reset Sequences 113 113 0 0.304s
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Install Comments 0 0 0 0.000s
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----------------------------------------------- --------- --------- --------- --------------
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Total import time 1894 1894 0 12.497s
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```
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If there is no output for more than 30 minutes, it's possible pgloader encountered an error. See
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the [troubleshooting guide](#Troubleshooting) for more details.
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1. Start GitLab:
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``` bash
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sudo gitlab-ctl start
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```
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Now, you can verify that everything worked by visiting GitLab.
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## Troubleshooting
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### Permissions
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Note that the PostgreSQL user that you use for the above MUST have **superuser** privileges. Otherwise, you may see
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a similar message to the following:
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```
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debugger invoked on a CL-POSTGRES-ERROR:INSUFFICIENT-PRIVILEGE in thread
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#<THREAD "lparallel" RUNNING {10078A3513}>:
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Database error 42501: permission denied: "RI_ConstraintTrigger_a_20937" is a system trigger
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QUERY: ALTER TABLE ci_builds DISABLE TRIGGER ALL;
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2017-08-23T00:36:56.782000Z ERROR Database error 42501: permission denied: "RI_ConstraintTrigger_c_20864" is a system trigger
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QUERY: ALTER TABLE approver_groups DISABLE TRIGGER ALL;
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```
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### Experiencing 500 errors after the migration
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If you experience 500 errors after the migration, try to clear the cache:
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``` bash
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sudo gitlab-rake cache:clear
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```
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[reconfigure GitLab]: ../administration/restart_gitlab.md#omnibus-gitlab-reconfigure
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