+<notextile>
+<div class="releasenotes">
+</notextile>
+
+h2(#v2_0_0). v2.0.0 (2020-02-14)
+
+"Upgrading from 1.4":#v1_4_1
+
+Arvados 2.0 is a major upgrade, with many changes. Please read these upgrade notes carefully before you begin.
+
+h3. Migrating to centralized config.yml
+
+See "Migrating Configuration":config-migration.html for notes on migrating legacy per-component configuration files to the new centralized @/etc/arvados/config.yml@.
+
+To ensure a smooth transition, the per-component config files continue to be read, and take precedence over the centralized configuration. Your cluster should continue to function after upgrade but before doing the full configuration migration. However, several services (keepstore, keep-web, keepproxy) require a minimal `/etc/arvados/config.yml` to start:
+
+<pre>
+Clusters:
+ zzzzz:
+ Services:
+ Controller:
+ ExternalURL: "https://zzzzz.example.com"
+</pre>
+
+h3. Keep-balance configuration migration
+
+(feature "#14714":https://dev.arvados.org/issues/14714 ) The keep-balance service can now be configured using the centralized configuration file at @/etc/arvados/config.yml@. The following command line and configuration options have changed.
+
+You can no longer specify types of keep services to balance via the @KeepServiceTypes@ config option in the legacy config at @/etc/arvados/keep-balance/keep-balance.yml@. If you are still using the legacy config and @KeepServiceTypes@ has a value other than "disk", keep-balance will produce an error.
+
+You can no longer specify individual keep services to balance via the @config.KeepServiceList@ command line option or @KeepServiceList@ legacy config option. Instead, keep-balance will operate on all keepstore servers with @service_type:disk@ as reported by the @arv keep_service list@ command. If you are still using the legacy config, @KeepServiceList@ should be removed or keep-balance will produce an error.
+
+Please see the "config migration guide":{{site.baseurl}}/admin/config-migration.html and "keep-balance install guide":{{site.baseurl}}/install/install-keep-balance.html for more details.
+
+h3. Arv-git-httpd configuration migration
+
+(feature "#14712":https://dev.arvados.org/issues/14712 ) The arv-git-httpd package can now be configured using the centralized configuration file at @/etc/arvados/config.yml@. Configuration via individual command line arguments is no longer available. Please see "arv-git-httpd's config migration guide":{{site.baseurl}}/admin/config-migration.html#arv-git-httpd for more details.
+
+h3. Keepstore and keep-web configuration migration
+
+keepstore and keep-web no longer support configuration via (previously deprecated) command line configuration flags and environment variables.
+
+keep-web now supports the legacy @keep-web.yml@ config format (used by Arvados 1.4) and the new cluster config file format. Please check "keep-web's install guide":{{site.baseurl}}/install/install-keep-web.html for more details.
+
+keepstore now supports the legacy @keepstore.yml@ config format (used by Arvados 1.4) and the new cluster config file format. Please check the "keepstore config migration notes":{{site.baseurl}}/admin/config-migration.html#keepstore and "keepstore install guide":{{site.baseurl}}/install/install-keepstore.html for more details.
+
+h3. Keepproxy configuration migration
+
+(feature "#14715":https://dev.arvados.org/issues/14715 ) Keepproxy can now be configured using the centralized config at @/etc/arvados/config.yml@. Configuration via individual command line arguments is no longer available and the @DisableGet@, @DisablePut@, and @PIDFile@ configuration options are no longer supported. If you are still using the legacy config and @DisableGet@ or @DisablePut@ are set to true or @PIDFile@ has a value, keepproxy will produce an error and fail to start. Please see "keepproxy's config migration guide":{{site.baseurl}}/admin/config-migration.html#keepproxy for more details.
+
+h3. Delete "keep_services" records
+
+After all keepproxy and keepstore configurations have been migrated to the centralized configuration file, all keep_services records you added manually during installation should be removed. System logs from keepstore and keepproxy at startup, as well as the output of @arvados-server config-check@, will remind you to do this.
+
+<notextile><pre><code>$ export ARVADOS_API_HOST=...
+$ export ARVADOS_API_TOKEN=...
+$ arv --format=uuid keep_service list | xargs -n1 arv keep_service delete --uuid
+</code></pre></notextile>
+
+Once these old records are removed, @arv keep_service list@ will instead return the services listed under Services/Keepstore/InternalURLs and Services/Keepproxy/ExternalURL in your centralized configuration file.
+
+h3. Enabling Postgres trigram indexes
+
+Feature "#15106":https://dev.arvados.org/issues/15106 improves the speed and functionality of full text search by introducing trigram indexes on text searchable database columns via a migration. Prior to updating, you must first install the postgresql-contrib package on your system and subsequently run the <code class="userprint">CREATE EXTENSION pg_trgm</code> SQL command on the arvados_production database as a postgres superuser.
+
+The "postgres-contrib package":https://www.postgresql.org/docs/10/contrib.html has been supported since PostgreSQL version 9.4. The version of the contrib package should match the version of your PostgreSQL installation. Using 9.5 as an example, the package can be installed and the extension enabled using the following:
+
+<strong>Centos 7</strong>
+<notextile>
+<pre><code>~$ <span class="userinput">sudo yum install -y postgresql95-contrib</span>
+~$ <span class="userinput">su - postgres -c "psql -d 'arvados_production' -c 'CREATE EXTENSION IF NOT EXISTS pg_trgm'"</span>
+</code></pre>
+</notextile>
+
+<strong>RHEL 7</strong>
+<notextile>
+<pre><code>~$ <span class="userinput">sudo yum install -y rh-postgresql95-postgresql-contrib</span>
+~$ <span class="userinput">su - postgres -c "psql -d 'arvados_production' -c 'CREATE EXTENSION IF NOT EXISTS pg_trgm'"</span>
+</code></pre>
+</notextile>
+
+<strong>Debian or Ubuntu</strong>
+<notextile>
+<pre><code>~$ <span class="userinput">sudo apt-get install -y postgresql-contrib-9.5</span>
+~$ <span class="userinput">sudo -u postgres psql -d 'arvados_production' -c 'CREATE EXTENSION IF NOT EXISTS pg_trgm'</span>
+</code></pre>
+</notextile>
+
+Subsequently, the <code class="userinput">psql -d 'arvados_production' -c '\dx'</code> command will display the installed extensions for the arvados_production database. This list should now contain @pg_trgm@.