mirror of
https://github.com/osm-search/Nominatim.git
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151 lines
4.5 KiB
Markdown
151 lines
4.5 KiB
Markdown
# Basic Installation
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This page contains generic installation instructions for Nominatim and its
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prerequisites. There are also step-by-step instructions available for
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the following operating systems:
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* [Ubuntu 20.04](../appendix/Install-on-Ubuntu-20.md)
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* [Ubuntu 18.04](../appendix/Install-on-Ubuntu-18.md)
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* [CentOS 8](../appendix/Install-on-Centos-8.md)
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* [CentOS 7.2](../appendix/Install-on-Centos-7.md)
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These OS-specific instructions can also be found in executable form
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in the `vagrant/` directory.
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Users have created instructions for other frameworks. We haven't tested those
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and can't offer support.
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* [Docker](https://github.com/mediagis/nominatim-docker)
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* [Docker on Kubernetes](https://github.com/peter-evans/nominatim-k8s)
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* [Ansible](https://github.com/synthesio/infra-ansible-nominatim)
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## Prerequisites
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### Software
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For compiling:
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* [cmake](https://cmake.org/)
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* [expat](https://libexpat.github.io/)
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* [proj](https://proj.org/)
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* [bzip2](http://www.bzip.org/)
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* [zlib](https://www.zlib.net/)
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* [Boost libraries](https://www.boost.org/), including system and filesystem
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* PostgreSQL client libraries
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* a recent C++ compiler (gcc 5+ or Clang 3.8+)
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For running Nominatim:
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* [PostgreSQL](https://www.postgresql.org) (9.3+)
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* [PostGIS](https://postgis.org) (2.2+)
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* [Python 3](https://www.python.org/)
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* [Psycopg2](https://initd.org/psycopg)
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* [PHP](https://php.net) (7.0 or later)
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* PHP-pgsql
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* PHP-intl (bundled with PHP)
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For running continuous updates:
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* [pyosmium](https://osmcode.org/pyosmium/) (with Python 3)
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For running tests:
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* [behave](http://pythonhosted.org/behave/)
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* [nose](https://nose.readthedocs.io)
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* [phpunit](https://phpunit.de) >= 7.3
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### Hardware
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A minimum of 2GB of RAM is required or installation will fail. For a full
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planet import 64GB of RAM or more are strongly recommended. Do not report
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out of memory problems if you have less than 64GB RAM.
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For a full planet install you will need at least 800GB of hard disk space
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(take into account that the OSM database is growing fast). SSD disks
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will help considerably to speed up import and queries.
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Even on a well configured machine the import of a full planet takes
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at least 2 days. Without SSDs 7-8 days are more realistic.
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## Tuning the PostgreSQL database
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You might want to tune your PostgreSQL installation so that the later steps
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make best use of your hardware. You should tune the following parameters in
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your `postgresql.conf` file.
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shared_buffers = 2GB
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maintenance_work_mem = (10GB)
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autovacuum_work_mem = 2GB
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work_mem = (50MB)
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effective_cache_size = (24GB)
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synchronous_commit = off
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checkpoint_segments = 100 # only for postgresql <= 9.4
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max_wal_size = 1GB # postgresql > 9.4
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checkpoint_timeout = 10min
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checkpoint_completion_target = 0.9
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The numbers in brackets behind some parameters seem to work fine for
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64GB RAM machine. Adjust to your setup. A higher number for `max_wal_size`
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means that PostgreSQL needs to run checkpoints less often but it does require
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the additional space on your disk.
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Autovacuum must not be switched off because it ensures that the
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tables are frequently analysed. If your machine has very little memory,
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you might consider setting:
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autovacuum_max_workers = 1
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and even reduce `autovacuum_work_mem` further. This will reduce the amount
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of memory that autovacuum takes away from the import process.
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For the initial import, you should also set:
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fsync = off
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full_page_writes = off
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Don't forget to reenable them after the initial import or you risk database
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corruption.
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## Downloading and building Nominatim
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### Downloading the latest release
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You can download the [latest release from nominatim.org](https://nominatim.org/downloads/).
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The release contains all necessary files. Just unpack it.
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### Downloading the latest development version
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If you want to install latest development version from github, make sure to
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also check out the osm2pgsql subproject:
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```
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git clone --recursive git://github.com/openstreetmap/Nominatim.git
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```
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The development version does not include the country grid. Download it separately:
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```
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wget -O Nominatim/data/country_osm_grid.sql.gz https://www.nominatim.org/data/country_grid.sql.gz
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```
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### Building Nominatim
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The code must be built in a separate directory. Create the directory and
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change into it.
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```
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mkdir build
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cd build
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```
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Nominatim uses cmake and make for building. Assuming that you have created the
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build at the same level as the Nominatim source directory run:
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```
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cmake ../Nominatim
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make
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```
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Now continue with [importing the database](Import.md).
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