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Robert Speicher 567eac0396 Reformat and copy edit the CI-to-CE migration guide
2015-09-17 16:24:00 -04:00
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README.md Reformat and copy edit the CI-to-CE migration guide 2015-09-17 16:24:00 -04:00

README.md

Migrate GitLab CI to GitLab CE or EE

Beginning with version 8.0 of GitLab Community Edition (CE) and Enterprise Edition (EE), GitLab CI is no longer its own application, but is instead built into the CE and EE applications.

This guide will detail the process of migrating your CI installation and data into your GitLab CE or EE installation.

Before we begin

You need to have a working installation of GitLab CI version 7.14 to perform this migration. The older versions are not supported and will most likely break this migration procedure.

This migration cannot be performed online and takes a significant amount of time. Make sure to plan ahead.

If you are running a version of GitLab CI prior to 7.14 please follow the appropriate update guide.

The migration is divided into three parts:

  1. GitLab CI
  2. Gitlab CE (or EE)
  3. Finishing Up

Part I: GitLab CI

1. Stop GitLab CI

sudo service gitlab_ci stop

2. Create a backup

The migration procedure modifies the structure of the CI database. If something goes wrong, you will not be able to revert to a previous version without a backup:

cd /home/gitlab_ci/gitlab-ci
sudo -u gitlab_ci -H bundle exec backup:create RAILS_ENV=production

3. Rename database tables

To prevent naming conflicts with database tables in GitLab CE or EE, we need to rename CI's tables to begin with a ci_ prefix:

cat <<EOF | bundle exec rails dbconsole production
ALTER TABLE application_settings RENAME TO ci_application_settings;
ALTER TABLE builds RENAME TO ci_builds;
ALTER TABLE commits RENAME TO ci_commits;
ALTER TABLE events RENAME TO ci_events;
ALTER TABLE jobs RENAME TO ci_jobs;
ALTER TABLE projects RENAME TO ci_projects;
ALTER TABLE runner_projects RENAME TO ci_runner_projects;
ALTER TABLE runners RENAME TO ci_runners;
ALTER TABLE services RENAME TO ci_services;
ALTER TABLE tags RENAME TO ci_tags;
ALTER TABLE taggings RENAME TO ci_taggings;
ALTER TABLE trigger_requests RENAME TO ci_trigger_requests;
ALTER TABLE triggers RENAME TO ci_triggers;
ALTER TABLE variables RENAME TO ci_variables;
ALTER TABLE web_hooks RENAME TO ci_web_hooks;
EOF

4. Remove cronjob

cd /home/gitlab_ci/gitlab-ci
sudo -u gitlab_ci -H bundle exec whenever --clear-crontab

5. Create a database dump

In this step, you will need to know information about both your CI and CE (or EE) databases, such as the server types, hosts, and ports, and the usernames and passwords.

We can obtain the necessary information from the config/database.yml files for each installation.

  1. Get the information for the CI database:

    cat /home/gitlab_ci/gitlab-ci/config/database.yml

  2. Then for the CE (or EE) database:

    cat /home/git/gitlab/config/database.yml

  3. The output of each command should look something like this:

    production:
  adapter: postgresql (or mysql2)
  encoding: utf8
  reconnect: false
  database: GITLAB_CI_DATABASE
  pool: 5
  username: DB_USERNAME
  password: DB_PASSWORD
  host: DB_HOSTNAME
  port: DB_PORT
  # socket: /tmp/mysql.sock

  4. Depending on the values for adapter, you will have to use different commands to perform the database dump.

    NOTE: For any of the commands below, you'll need to substitute the values IN_UPPERCASE with the corresponding values from your CI installation's config/database.yml files above.

    • If both your CI and CE (or EE) installations use mysql2 as the adapter, use mysqldump:

      mysqldump --default-character-set=utf8 --complete-insert --no-create-info \
  --host=DB_USERNAME --port=DB_PORT --user=DB_HOSTNAME -p GITLAB_CI_DATABASE \
  ci_application_settings ci_builds ci_commits ci_events ci_jobs ci_projects \
  ci_runner_projects ci_runners ci_services ci_tags ci_taggings ci_trigger_requests \
  ci_triggers ci_variables ci_web_hooks > gitlab_ci.sql

    • If both your CI and CE (or EE) installations use postgresql as the adapter, use pg_dump:

      pg_dump -h DB_HOSTNAME -U DB_USERNAME -p DB_PORT \
  --data-only GITLAB_CI_DATABASE -t "ci_*" > gitlab_ci.sql

    • If your CI installation uses mysql2 as the adapter and your CE (or EE) installation uses postgresql, use mysqldump to dump the database and then convert it to PostgreSQL using mysql-postgresql-converter:

      # Dump existing MySQL database first
mysqldump --default-character-set=utf8 --compatible=postgresql --complete-insert \
  --host=DB_USERNAME --port=DB_PORT --user=DB_HOSTNAME -p GITLAB_CI_DATABASE \
  ci_application_settings ci_builds ci_commits ci_events ci_jobs ci_projects \
  ci_runner_projects ci_runners ci_services ci_tags ci_taggings ci_trigger_requests \
  ci_triggers ci_variables ci_web_hooks > gitlab_ci.sql.tmp

# Convert database to be compatible with PostgreSQL
git clone https://github.com/gitlabhq/mysql-postgresql-converter.git -b gitlab
python mysql-postgresql-converter/db_converter.py gitlab_ci.sql.tmp gitlab_ci.sql.tmp2
ed -s gitlab_ci.sql.tmp2 < mysql-postgresql-converter/move_drop_indexes.ed

# Filter to only include INSERT statements
grep "^\(START\|SET\|INSERT\|COMMIT\)" gitlab_ci.sql.tmp2 > gitlab_ci.sql

Part II: GitLab CE (or EE)

1. Ensure GitLab is updated

Your GitLab CE or EE installation must be version 8.0. If it's not, follow the update guide.

2. Stop GitLab

Before you can migrate data you need to stop the GitLab service first:

sudo service gitlab stop

3. Create a backup

This migration poses a significant risk of breaking your GitLab installation. Create a backup before proceeding:

cd /home/git/gitlab
sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production

4. Copy secret tokens from CI

The secrets.yml file stores encryption keys for secure variables.

You need to copy the contents of GitLab CI's config/secrets.yml file to the same file in GitLab CE:

sudo cp /home/gitlab_ci/gitlab-ci/config/secrets.yml /home/git/gitlab/config/secrets.yml
sudo chown git:git /home/git/gitlab/config/secrets.yml
sudo chown 0600 /home/git/gitlab/config/secrets.yml

5. New configuration options for gitlab.yml

There are new configuration options available for gitlab.yml. View them with the command below and apply them manually to your current gitlab.yml:

git diff origin/7-14-stable:config/gitlab.yml.example origin/8-0-stable:config/gitlab.yml.example

The new options include configuration settings for GitLab CI.

6. Copy build logs

You need to copy the contents of GitLab CI's builds/ directory to the corresponding directory in GitLab CE or EE:

sudo rsync -av /home/gitlab_ci/gitlab-ci/builds /home/git/gitlab/builds
sudo chown -R git:git /home/git/gitlab/builds

The build logs are usually quite big so it may take a significant amount of time.

7. Import GitLab CI database

Now you'll import the GitLab CI database dump that you created earlier into the GitLab CE or EE database:

sudo mv /home/gitlab_ci/gitlab-ci/gitlab_ci.sql /home/git/gitlab/gitlab_ci.sql
sudo chown git:git /home/git/gitlab/gitlab_ci.sql
sudo -u git -H bundle exec rake ci:migrate CI_DUMP=/home/git/gitlab/gitlab_ci.sql RAILS_ENV=production

This task will:

  1. Delete data from all existing CI tables
  2. Import data from database dump
  3. Fix database auto-increments
  4. Fix tags assigned to Builds and Runners
  5. Fix services used by CI

8. Start GitLab

You can start GitLab CI (or EE) now and see if everything is working:

sudo service gitlab start

Part III: Finishing Up

1. Update Nginx configuration

To ensure that your existing CI runners are able to communicate with the migrated installation, and that existing build triggers still work, you'll need to update your Nginx configuration to redirect requests for the old locations to the new ones.

Edit /etc/nginx/sites-available/gitlab_ci and paste:

# GITLAB CI
server {
  listen 80 default_server;         # e.g., listen 192.168.1.1:80;
  server_name YOUR_CI_SERVER_FQDN;  # e.g., server_name source.example.com;

  access_log  /var/log/nginx/gitlab_ci_access.log;
  error_log   /var/log/nginx/gitlab_ci_error.log;

  # expose API to fix runners
  location /api {
    proxy_read_timeout    300;
    proxy_connect_timeout 300;
    proxy_redirect        off;
    proxy_set_header      X-Real-IP $remote_addr;

    # You need to specify your DNS servers that are able to resolve YOUR_GITLAB_SERVER_FQDN
    resolver 8.8.8.8 8.8.4.4;
    proxy_pass $scheme://YOUR_GITLAB_SERVER_FQDN/ci$request_uri;
  }

  # expose build endpoint to allow trigger builds
  location ~ ^/projects/\d+/build$ {
    proxy_read_timeout    300;
    proxy_connect_timeout 300;
    proxy_redirect        off;
    proxy_set_header      X-Real-IP $remote_addr;

    # You need to specify your DNS servers that are able to resolve YOUR_GITLAB_SERVER_FQDN
    resolver 8.8.8.8 8.8.4.4;
    proxy_pass $scheme://YOUR_GITLAB_SERVER_FQDN/ci$request_uri;
  }

  # redirect all other CI requests
  location / {
    return 301 $scheme://YOUR_GITLAB_SERVER_FQDN/ci$request_uri;
  }

  # adjust this to match the largest build log your runners might submit,
  # set to 0 to disable limit
  client_max_body_size 10m;
}

Make sure you substitute these placeholder values with your real ones:

  1. YOUR_CI_SERVER_FQDN: The existing public-facing address of your GitLab CI install (e.g., ci.gitlab.com).
  2. YOUR_GITLAB_SERVER_FQDN: The current public-facing address of your GitLab CE (or EE) install (e.g., gitlab.com).

Make sure not to remove the /ci$request_uri part. This is required to properly forward the requests.

You should also make sure that you can:

  1. curl https://YOUR_GITLAB_SERVER_FQDN/ from your previous GitLab CI server.
  2. curl https://YOUR_CI_SERVER_FQDN/ from your GitLab CE (or EE) server.

2. Check Nginx configuration

sudo nginx -t

3. Restart Nginx

sudo /etc/init.d/nginx restart

4. Done!

If everything went well you should be able to access your migrated CI install by visiting https://gitlab.example.com/ci/.

If you visit the old GitLab CI address, you should be redirected to the new one.

Enjoy!