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  <title>Blogging Roller</title>
  <link>https://rollerweblogger.org/roller/</link>
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  <description>Dave Johnson on open web technologies, social software and software development</description>
  <language>en-us</language>
  <copyright>Copyright 2026</copyright>
  <lastBuildDate>Tue, 28 Apr 2026 07:02:22 +0000</lastBuildDate>
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  <item>
    <guid isPermaLink="true">https://rollerweblogger.org/roller/entry/powered-by-postgresql</guid>
    <title>Powered by Postgresql and Docker Swarm</title>
    <dc:creator>Dave Johnson</dc:creator>
    <link>https://rollerweblogger.org/roller/entry/powered-by-postgresql</link>
    <pubDate>Tue, 7 Nov 2017 21:52:40 +0000</pubDate>
    <category>Roller</category>
    <category>asf</category>
    <category>docker</category>
    <category>postgresql</category>
    <category>swarm</category>
<description>It was somewhat painful but due to some problems with MySQL and Docker, and some general uneasiness with MySQL, I switched this site from MySQL v5.7 to &lt;a href=&quot;https://www.postgresql.org&quot;&gt;PostgreSQL&lt;/a&gt; v10. I also switched over to &lt;a href=&quot;https://docs.docker.com/engine/swarm/&quot;&gt;Docker Swarm&lt;/a&gt;. Here&amp;#39;s the Docker-Compose file that I&amp;#39;m using now to run this site:

&lt;pre&gt;
version: &amp;#39;3.2&amp;#39;

services:

   postgresql:
      image: &amp;quot;postgres:10.0&amp;quot;
      ports:
         - &amp;quot;5432:5432&amp;quot;
      deploy:
         resources:
           limits:
              memory: 50M
      volumes:
         - type: bind
           source: /var/lib/postgresql/data
           target: /var/lib/postgresql/data
      environment:
        - POSTGRES_USER=roller
        - POSTGRES_DB=rollerdb
        - POSTGRES_PASSWORD_FILE=/run/secrets/pg_passwd
      secrets:
        - source: db_passwd
          target: pg_passwd

   roller:
      image: &amp;quot;rwo:latest&amp;quot;
      ports:
        -  &amp;quot;80:8080&amp;quot;
      depends_on:
        - postgresql
      deploy:
         resources:
           limits:
              memory: 800M
      volumes:
        - type: bind
          source: /var/lib/roller
          target: /var/lib/roller
      environment:
        - DB_HOST=postgresql
        - STORAGE_ROOT=/var/lib/roller
        - JAVA_OPTS=&amp;quot;-Xmx700m&amp;quot;

secrets:
  db_passwd:
    file: ./db_passwd.txt
&lt;/pre&gt;

It was a pain, but sometimes pain = gain and I learned a lot. I&amp;#39;m hoping the site will be a bit more stable now. </description>  </item>
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