Commit d1a23c3e authored by Marcia Ramos's avatar Marcia Ramos 🔴 Committed by Clement Ho

Merge branch 'docs/subgroups-mysql' into 'master'

Mention limitations of MySQL in docs

See merge request !12272
parent 679c5928
......@@ -86,56 +86,31 @@ if your available memory changes.
Notice: The 25 workers of Sidekiq will show up as separate processes in your process overview (such as top or htop) but they share the same RAM allocation since Sidekiq is a multithreaded application. Please see the section below about Unicorn workers for information about many you need of those.
## GitLab Runner
We strongly advise against installing GitLab Runner on the same machine you plan
to install GitLab on. Depending on how you decide to configure GitLab Runner and
what tools you use to exercise your application in the CI environment, GitLab
Runner can consume significant amount of available memory.
Memory consumption calculations, that are available above, will not be valid if
you decide to run GitLab Runner and the GitLab Rails application on the same
machine.
It is also not safe to install everything on a single machine, because of the
[security reasons] - especially when you plan to use shell executor with GitLab
Runner.
We recommend using a separate machine for each GitLab Runner, if you plan to
use the CI features.
[security reasons]: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/blob/master/docs/security/index.md
## Unicorn Workers
It's possible to increase the amount of unicorn workers and this will usually help to reduce the response time of the applications and increase the ability to handle parallel requests.
For most instances we recommend using: CPU cores + 1 = unicorn workers.
So for a machine with 2 cores, 3 unicorn workers is ideal.
For all machines that have 2GB and up we recommend a minimum of three unicorn workers.
If you have a 1GB machine we recommend to configure only two Unicorn workers to prevent excessive swapping.
To change the Unicorn workers when you have the Omnibus package please see [the Unicorn settings in the Omnibus GitLab documentation](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/settings/unicorn.md#unicorn-settings).
## Database
The server running the database should have _at least_ 5-10 GB of storage
available, though the exact requirements depend on the size of the GitLab
installation (e.g. the number of users, projects, etc).
We currently support the following databases:
- PostgreSQL
- MySQL/MariaDB
We _highly_ recommend the use of PostgreSQL instead of MySQL/MariaDB as not all
features of GitLab may work with MySQL/MariaDB. For example, MySQL does not have
the right features to support nested groups in an efficient manner; see
<https://gitlab.com/gitlab-org/gitlab-ce/issues/30472> for more information
about this. GitLab Geo also does [not support MySQL](https://docs.gitlab.com/ee/gitlab-geo/database.html#mysql-replication).
We **highly recommend** the use of PostgreSQL instead of MySQL/MariaDB as not all
features of GitLab may work with MySQL/MariaDB:
1. MySQL support for subgroups was [dropped with GitLab 9.3][post].
See [issue #30472][30472] for more information.
1. GitLab Geo does [not support MySQL](https://docs.gitlab.com/ee/gitlab-geo/database.html#mysql-replication).
1. [Zero downtime migrations][zero] do not work with MySQL
Existing users using GitLab with MySQL/MariaDB are advised to
migrate to PostgreSQL instead.
[migrate to PostgreSQL](../update/mysql_to_postgresql.md) instead.
The server running the database should have _at least_ 5-10 GB of storage
available, though the exact requirements depend on the size of the GitLab
installation (e.g. the number of users, projects, etc).
[30472]: https://gitlab.com/gitlab-org/gitlab-ce/issues/30472
[zero]: ../update/README.md#upgrading-without-downtime
[post]: https://about.gitlab.com/2017/06/22/gitlab-9-3-released/#dropping-support-for-subgroups-in-mysql
### PostgreSQL Requirements
......@@ -154,6 +129,18 @@ CREATE EXTENSION pg_trgm;
On some systems you may need to install an additional package (e.g.
`postgresql-contrib`) for this extension to become available.
## Unicorn Workers
It's possible to increase the amount of unicorn workers and this will usually help to reduce the response time of the applications and increase the ability to handle parallel requests.
For most instances we recommend using: CPU cores + 1 = unicorn workers.
So for a machine with 2 cores, 3 unicorn workers is ideal.
For all machines that have 2GB and up we recommend a minimum of three unicorn workers.
If you have a 1GB machine we recommend to configure only two Unicorn workers to prevent excessive swapping.
To change the Unicorn workers when you have the Omnibus package please see [the Unicorn settings in the Omnibus GitLab documentation](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/settings/unicorn.md#unicorn-settings).
## Redis and Sidekiq
Redis stores all user sessions and the background task queue.
......@@ -172,6 +159,26 @@ default settings.
If you would like to disable Prometheus and it's exporters or read more information
about it, check the [Prometheus documentation](../administration/monitoring/prometheus/index.md).
## GitLab Runner
We strongly advise against installing GitLab Runner on the same machine you plan
to install GitLab on. Depending on how you decide to configure GitLab Runner and
what tools you use to exercise your application in the CI environment, GitLab
Runner can consume significant amount of available memory.
Memory consumption calculations, that are available above, will not be valid if
you decide to run GitLab Runner and the GitLab Rails application on the same
machine.
It is also not safe to install everything on a single machine, because of the
[security reasons] - especially when you plan to use shell executor with GitLab
Runner.
We recommend using a separate machine for each GitLab Runner, if you plan to
use the CI features.
[security reasons]: https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/blob/master/docs/security/index.md
## Supported web browsers
We support the current and the previous major release of Firefox, Chrome/Chromium, Safari and Microsoft browsers (Microsoft Edge and Internet Explorer 11).
......
......@@ -11,22 +11,6 @@ There are currently 3 official ways to install GitLab:
Based on your installation, choose a section below that fits your needs.
---
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
**Table of Contents** *generated with [DocToc](https://github.com/thlorenz/doctoc)*
- [Omnibus Packages](#omnibus-packages)
- [Installation from source](#installation-from-source)
- [Installation using Docker](#installation-using-docker)
- [Upgrading between editions](#upgrading-between-editions)
- [Community to Enterprise Edition](#community-to-enterprise-edition)
- [Enterprise to Community Edition](#enterprise-to-community-edition)
- [Miscellaneous](#miscellaneous)
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
## Omnibus Packages
- The [Omnibus update guide](http://docs.gitlab.com/omnibus/update/README.html)
......
# Subgroups
> [Introduced][ce-2772] in GitLab 9.0.
>**Notes:**
- [Introduced][ce-2772] in GitLab 9.0.
- Not available when using MySQL as external database (support removed in
GitLab 9.3 [due to performance reasons][issue]).
With subgroups (aka nested groups or hierarchical groups) you can have
up to 20 levels of nested groups, which among other things can help you to:
......@@ -173,3 +176,4 @@ Here's a list of what you can't do with subgroups:
[ce-2772]: https://gitlab.com/gitlab-org/gitlab-ce/issues/2772
[permissions]: ../../permissions.md#group
[reserved]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/path_regex.rb
[issue]: https://gitlab.com/gitlab-org/gitlab-ce/issues/30472#note_27747600
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