<h3 id="heading-step-1-run-the-postgres-docker-container">Step 1: Run the postgres docker container</h3>
<pre><code class="lang-bash">$ docker run -it --rm --network=host postgres:11.16 bash
root@a018fe70d745:/<span class="hljs-comment"># apt update &amp;&amp; apt install telnet -y</span>
</code></pre>
<h3 id="heading-step-2-check-if-postgres-is-connected-by-using-telnet-command">Step 2: Check if postgres is connected by using telnet command</h3>
<p>For example the endpoint of the RDS: <code>rds-database.abcdefghi.us-east-1.rds.amazonaws.com</code></p>
<pre><code class="lang-bash">root@a018fe70d745:/<span class="hljs-comment"># telnet rds-database.abcdefghi.us-east-1.rds.amazonaws.com 5432</span>
Connected to rds-database.abcdefghi.us-east-1.rds.amazonaws.com.
Escape character is <span class="hljs-string">'^]'</span>.
^]
</code></pre>
<h3 id="heading-step-3-connect-using-the-psql-command">Step 3: Connect using the psql command</h3>
<p>The command: <code>psql -h rds-database.abcdefghi.us-east-1.rds.amazonaws.com -p 5432 -U &lt;username&gt; -d &lt;dbname&gt; -W</code></p>
<pre><code class="lang-bash">root@a018fe70d745:/<span class="hljs-comment"># psql -h rds-database.abcdefghi.us-east-1.rds.amazonaws.com -p 5432 -U test -d db_test -W</span>
Password: 
psql (11.16 (Debian 11.16-1.pgdg90+1))
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type <span class="hljs-string">"help"</span> <span class="hljs-keyword">for</span> <span class="hljs-built_in">help</span>.

db_test=&gt;
</code></pre>


### Step 1: Run the postgres docker container
```bash
$ docker run -it --rm --network=host postgres:11.16 bash
root@a018fe70d745:/# apt update && apt install telnet -y
```

### Step 2: Check if postgres is connected by using telnet command

For example the endpoint of the RDS: `rds-database.abcdefghi.us-east-1.rds.amazonaws.com`

```bash
root@a018fe70d745:/# telnet rds-database.abcdefghi.us-east-1.rds.amazonaws.com 5432
Connected to rds-database.abcdefghi.us-east-1.rds.amazonaws.com.
Escape character is '^]'.
^]
```

### Step 3: Connect using the psql command

The command: `psql -h rds-database.abcdefghi.us-east-1.rds.amazonaws.com -p 5432 -U <username> -d <dbname> -W`

```bash
root@a018fe70d745:/# psql -h rds-database.abcdefghi.us-east-1.rds.amazonaws.com -p 5432 -U test -d db_test -W
Password: 
psql (11.16 (Debian 11.16-1.pgdg90+1))
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type "help" for help.

db_test=>
```


Connect RDS (PostgreSQL) from Docker container

Step 1: Run the postgres docker container

Step 2: Check if postgres is connected by using telnet command

Step 3: Connect using the psql command