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copied!<p>I'm not sure for which server you are talking about. But I can provide you an example for thin which supports rolling restart itself. (option <code>onebyone: true</code>) </p> <p>So for monit you can use something like,</p> <p><code>if ... then exec '/path/to/thin_restart.sh'</code></p> <p>And <code>thin_restart.sh</code> would be something like,</p> <pre><code>source /path/to/scripts/rvm rvm use your_gemset@some_ruby thin -C thin.yml restart </code></pre> <p>And contents of thin.yml would look like,</p> <pre><code>port: 1337 pid: tmp/pids/thin.pid rackup: /path/to/config.ru daemonize: true servers: 2 onebyone: true </code></pre> <p>There are other ways to fine tune this restarts based on pid. You can monitor files with pids and restart only those thin process based on conditions. </p> <p>e.g.</p> <pre><code>check process app-1337 with pid /path/to/app.1337.pid start = 'thin -d -p 1337 start' stop = 'thin -d -p 1337 -P /path/to/thin.1337.pid stop' if cpu usage > 50% then restart check process app-1338 with pid /path/to/app.1338.pid start = 'thin -d -p 1338 start' stop = 'thin -d -p 1338 -P /path/to/thin.1338.pid stop' if cpu usage > 50% then restart </code></pre> <p>The other way would be of using groups which monit provides.</p> <p>Extending above example.</p> <pre><code>check process app-1337 with pid /path/to/app.1337.pid group thin group thin-odd start = 'thin -d -p 1337 start' stop = 'thin -d -p 1337 -P /path/to/thin.1337.pid stop' if cpu usage > 50% then restart check process app-1338 with pid /path/to/app.1338.pid group thin group thin-even start = 'thin -d -p 1338 start' stop = 'thin -d -p 1338 -P /path/to/thin.1338.pid stop' if cpu usage > 50% then restart check process app-1337 with pid /path/to/app.1339.pid group thin group thin-odd start = 'thin -d -p 1339 start' stop = 'thin -d -p 1339 -P /path/to/thin.1339.pid stop' if cpu usage > 50% then restart check process app-1340 with pid /path/to/app.1340.pid group thin group thin-even start = 'thin -d -p 1340 start' stop = 'thin -d -p 1340 -P /path/to/thin.1340.pid stop' if cpu usage > 50% then restart </code></pre> <p>So now you can do following to restart all:</p> <pre><code>monit -g thin restart </code></pre> <p>or to achieve sort of rolling restart, restart odd ones then even. To restart only odd ones:</p> <pre><code>monit -g thin-odd restart </code></pre> <p>and to restart even:</p> <pre><code>monit -g thin-even restart </code></pre>

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