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<article class="markdown-body">
<header>
<h1 class="title">PostgreSQL system role</h1>
</header>
<hr>
<nav id="TOC">
<h1 class="toc-title">Contents</h1>
<ul>
<li><a href="#requirements" id="toc-requirements">Requirements</a>
<ul>
<li><a href="#collection-requirements"
id="toc-collection-requirements">Collection requirements</a></li>
</ul></li>
<li><a href="#role-variables" id="toc-role-variables">Role Variables</a>
<ul>
<li><a href="#postgresql_version"
id="toc-postgresql_version">postgresql_version</a></li>
<li><a href="#postgresql_password"
id="toc-postgresql_password">postgresql_password</a></li>
<li><a href="#postgresql_pg_hba_conf"
id="toc-postgresql_pg_hba_conf">postgresql_pg_hba_conf</a></li>
<li><a href="#postgresql_server_conf"
id="toc-postgresql_server_conf">postgresql_server_conf</a></li>
<li><a href="#postgresql_ssl_enable"
id="toc-postgresql_ssl_enable">postgresql_ssl_enable</a></li>
<li><a href="#postgresql_cert_name"
id="toc-postgresql_cert_name">postgresql_cert_name</a></li>
<li><a href="#postgresql_certificates"
id="toc-postgresql_certificates">postgresql_certificates</a></li>
<li><a href="#postgresql_input_file"
id="toc-postgresql_input_file">postgresql_input_file</a></li>
<li><a href="#postgresql_server_tuning"
id="toc-postgresql_server_tuning">postgresql_server_tuning</a></li>
</ul></li>
<li><a href="#idempotence" id="toc-idempotence">Idempotence</a>
<ul>
<li><a href="#password-change" id="toc-password-change">Password
change</a></li>
<li><a href="#config-file-redefinition"
id="toc-config-file-redefinition">Config file redefinition</a></li>
<li><a href="#version-change" id="toc-version-change">Version
change</a></li>
<li><a href="#server-tunning" id="toc-server-tunning">Server
tunning</a></li>
<li><a href="#ssl-usage" id="toc-ssl-usage">SSL usage</a></li>
</ul></li>
<li><a href="#example-playbook" id="toc-example-playbook">Example
Playbook</a></li>
<li><a href="#rpm-ostree" id="toc-rpm-ostree">rpm-ostree</a></li>
<li><a href="#license" id="toc-license">License</a></li>
</ul>
</nav>
<hr>
<p>The PostgreSQL system role installs, configures, and starts the
PostgreSQL server.</p>
<p>The role also optimizes the database server settings to improve
performance.</p>
<h1 id="requirements">Requirements</h1>
<p>The role currently works with the PostgreSQL server 10, 12, 13, 15
and 16.</p>
<h2 id="collection-requirements">Collection requirements</h2>
<p>The role requires some external collections. Use this to install
them:</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">ansible-galaxy</span> collection install <span class="at">-vv</span> <span class="at">-r</span> meta/collection-requirements.yml</span></code></pre></div>
<h1 id="role-variables">Role Variables</h1>
<h2 id="postgresql_version">postgresql_version</h2>
<p>You can set the version of the PostgreSQL server to 10, 12, 13, 15 or
16.</p>
<div class="sourceCode" id="cb2"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_version</span><span class="kw">:</span><span class="at"> </span><span class="st">"13"</span></span></code></pre></div>
<h2 id="postgresql_password">postgresql_password</h2>
<p>Optionally, you can set a password for the <code>postgres</code>
database superuser. By default, no password is set, and a datababase is
accessible from the <code>postgres</code> system account through a UNIX
socket. It is recommended to encrypt the password by using Ansible
Vault.</p>
<div class="sourceCode" id="cb3"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_password</span><span class="kw">: </span><span class="at">!vault </span><span class="ch">|</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> $ANSIBLE_VAULT;1.2;AES256;dev</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> ....</span></code></pre></div>
<h2 id="postgresql_pg_hba_conf">postgresql_pg_hba_conf</h2>
<p>The content of the <code>postgresql_pg_hba_conf</code> variable
replaces the default upstream configuration in the
<code>/var/lib/pgsql/data/pg_hba.conf</code> file.</p>
<div class="sourceCode" id="cb4"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_pg_hba_conf</span><span class="kw">:</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">type</span><span class="kw">:</span><span class="at"> local</span></span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">database</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">user</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">auth_method</span><span class="kw">:</span><span class="at"> peer</span></span>
<span id="cb4-6"><a href="#cb4-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">type</span><span class="kw">:</span><span class="at"> host</span></span>
<span id="cb4-7"><a href="#cb4-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">database</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-8"><a href="#cb4-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">user</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-9"><a href="#cb4-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">address</span><span class="kw">:</span><span class="at"> </span><span class="st">'127.0.0.1/32'</span></span>
<span id="cb4-10"><a href="#cb4-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">auth_method</span><span class="kw">:</span><span class="at"> ident</span></span>
<span id="cb4-11"><a href="#cb4-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">type</span><span class="kw">:</span><span class="at"> host</span></span>
<span id="cb4-12"><a href="#cb4-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">database</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-13"><a href="#cb4-13" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">user</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb4-14"><a href="#cb4-14" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">address</span><span class="kw">:</span><span class="at"> </span><span class="st">'::1/128'</span></span>
<span id="cb4-15"><a href="#cb4-15" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">auth_method</span><span class="kw">:</span><span class="at"> ident</span></span></code></pre></div>
<h2 id="postgresql_server_conf">postgresql_server_conf</h2>
<p>The content of the <code>postgresql_server_conf</code> variable is
added to the end of the <code>/var/lib/pgsql/data/postgresql.conf</code>
file. As a result, the default settings are overwritten.</p>
<div class="sourceCode" id="cb5"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_server_conf</span><span class="kw">:</span></span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ssl</span><span class="kw">:</span><span class="at"> </span><span class="ch">on</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">shared_buffers</span><span class="kw">:</span><span class="at"> 128MB</span></span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">huge_pages</span><span class="kw">:</span><span class="at"> try</span></span></code></pre></div>
<h2 id="postgresql_ssl_enable">postgresql_ssl_enable</h2>
<p>To set up an SSL/TLS connection, set the
<code>postgresql_ssl_enable</code> variable to <code>true</code> and
provide a server certificate and a private key.</p>
<div class="sourceCode" id="cb6"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_ssl_enable</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span></code></pre></div>
<h2 id="postgresql_cert_name">postgresql_cert_name</h2>
<p>If you want to use your own certificate and private key, use the
<code>postgresql_cert_name</code> variable to specify the certificate
name. You must keep both certificate and key files in the same directory
and under the same name with the <code>.crt</code> and <code>.key</code>
suffixes.</p>
<p>For example, if your certificate file is located in
<code>/etc/certs/server.crt</code> and your private key in
<code>/etc/certs/server.key</code>, set the
<code>postgresql_cert_name</code> value to:</p>
<div class="sourceCode" id="cb7"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_cert_name</span><span class="kw">:</span><span class="at"> /etc/certs/server</span></span></code></pre></div>
<h2 id="postgresql_certificates">postgresql_certificates</h2>
<p>The <code>postgresql_certificates</code> variable requires a
<code>list</code> of <code>dict</code> in the same format as used by the
<code>fedora.linux_system_roles.certificate</code> role. Specify the
<code>postgresql_certificates</code> variable if you want the
certificate role to generate certificates for the PostgreSQL server
configured by the PostgreSQL role. In the following example, a
<code>self-signed</code> certificate <code>postgresql_cert.crt</code> is
generated in the <code>/etc/pki/tls/certs/</code> directory. By default,
no certificates are automatically generated (<code>[]</code>).</p>
<div class="sourceCode" id="cb8"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_certificates</span><span class="kw">:</span></span>
<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> postgresql_cert</span></span>
<span id="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">dns</span><span class="kw">:</span><span class="at"> </span><span class="kw">[</span><span class="st">'localhost'</span><span class="kw">,</span><span class="at"> </span><span class="st">'www.example.com'</span><span class="kw">]</span></span>
<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ca</span><span class="kw">:</span><span class="at"> self-sign</span></span></code></pre></div>
<h2 id="postgresql_input_file">postgresql_input_file</h2>
<p>To run an SQL script, define a path to your SQL file by using the
<code>postgresql_input_file</code> variable:</p>
<div class="sourceCode" id="cb9"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_input_file</span><span class="kw">:</span><span class="at"> </span><span class="st">"/tmp/mypath/file.sql"</span></span></code></pre></div>
<h2 id="postgresql_server_tuning">postgresql_server_tuning</h2>
<p>By default, the PostgreSQL system role enables server settings
optimization based on system resources. To disabe the tuning, set the
<code>postgresql_server_tuning</code> variable to
<code>false</code>.</p>
<div class="sourceCode" id="cb10"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">postgresql_server_tuning</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span></code></pre></div>
<p>See the <a href="examples"><code>examples/</code></a> for
details.</p>
<h1 id="idempotence">Idempotence</h1>
<p>This section should cover role behavior for repeated runs.</p>
<h2 id="password-change">Password change</h2>
<p>Once you set the password by using the
<code>postgresql_password</code> variable, it is impossible to change
the password by setting another value. You must use the
<code>postgresql_password</code> variable for every database acces under
the superuser, including running an SQL script (the functionality of the
<code>postgresql_input_file</code> variable).</p>
<h2 id="config-file-redefinition">Config file redefinition</h2>
<p>Configuration files generated from
<code>postgresql_pg_hba_conf</code> and <code>postgresql_conf</code> are
regenerated within each single run. Therefore, every change rewrites the
previous configuration.</p>
<h2 id="version-change">Version change</h2>
<p>Once the PostgreSQL server is installed, it is impossible to upgrade
or downgrade the server by increasing or decreasing the version number
in the <code>postgresql_version</code> variable.</p>
<h2 id="server-tunning">Server tunning</h2>
<p>This option reflects the setup of the latest run of the role.</p>
<h2 id="ssl-usage">SSL usage</h2>
<p>This option reflects the setup of the latest run of the role. The
PostgreSQL server needs properly defined certificates and keys to run
with enabled SSL/TLS.</p>
<h1 id="example-playbook">Example Playbook</h1>
<div class="sourceCode" id="cb11"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="kw">-</span><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> Manage postgres</span></span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">hosts</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">postgresql_version</span><span class="kw">:</span><span class="at"> </span><span class="st">"13"</span></span>
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true" tabindex="-1"></a><span class="fu"> postgresql_password</span><span class="kw">: </span><span class="at">!vault </span><span class="ch">|</span></span>
<span id="cb11-6"><a href="#cb11-6" aria-hidden="true" tabindex="-1"></a> $ANSIBLE_VAULT;1.2;AES256;dev</span>
<span id="cb11-7"><a href="#cb11-7" aria-hidden="true" tabindex="-1"></a> ....</span>
<span id="cb11-8"><a href="#cb11-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">roles</span><span class="kw">:</span></span>
<span id="cb11-9"><a href="#cb11-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> linux-system-roles.postgresql</span></span></code></pre></div>
<p>You can find more examples in the <a
href="examples"><code>examples/</code></a> directory.</p>
<h1 id="rpm-ostree">rpm-ostree</h1>
<p>NOTE: By default, <code>get_ostree_data.sh</code> will return the
packages for the default version of PostgreSQL. You will need to amend
the output if you want to use a different version - e.g. change
<code>@postgresql:13/server</code> to
<code>@postgresql:15/server</code></p>
<p>See README-ostree.md for more information.</p>
<h1 id="license">License</h1>
<p>MIT</p>
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