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Ionut Gavrilut


DevOps Enthusiast | Linux System Administrator | Certified Jenkins Engineer


  1. Jenkins flood the log with DNS Errors

    Jenkins is flooding jenkins.log with this type of error: [DNSQuestion@809381925 type: TYPE_IGNORE index 0, class: CLASS_UNKNOWN index 0, name: ] In my case, disk usage of jenkins.log was 500G in few hours. …


  2. Redirect Outgoing Mails to MailHog with iptables

    If you want to redirect all outgoing mails to MailHog, using your firewall: iptables -t nat -A OUTPUT -p tcp -d a.b.c.d --dport 25 -j DNAT --to-destination 127.0.0.1:1025 assuming MailHog is installed locally. …


  3. Wordpress Installation not working

    After a Wordpress Installation, if you access Wordpress in browser and see this: ``` text <?php /** Front to the WordPress application. This file doesn’t do anything, but loads wp-blog-header.php which does and tells WordPress to load the theme. * @package WordPress */ …


  4. Hybris with Tomcat Session Replication and Failover

    This was tested on a 6.7 Hybris Commerce cluster setup, with b2c_acc_plus recipe. …


  5. Load Balancer Apache Configuration

    This setup is for testing purposes. Do not open /balancer-manager path for anyone. …


  6. Apache Basic Auth keeps prompting for password (401 Unauthorized)

    In my case, after a successfully login, Apache forwarded credentials to Jira/Confluence/Jenkins and tried to login there, resulting 401 errors. For this, I unset the Authorization header in Location directive (with mod_headers module). …


  7. Reset Jira and Confluence from Setup Wizard

    Reset Jira from Setup Wizard: …


  8. Light Log Monitoring and Alerting (Filebeat, ElasticSearch, ElastAlert)

    This method is a really light way to monitor logs in real time. Tools used: Filebeat ElasticSearch ElastAlert …


  9. Nagios Monitoring over SSH

    Nagios can monitor remote servers via NRPE or SSH. If your communication between servers is limited, and only SSH and few other ports are open, you can make a command in Nagios that connect over SSH and check the server with local nagios plugins. …


  10. Nagios check_jmx plugin – Examples using jconsole

    check_jmx plugin is a powerful tool for monitoring the JVM. Examples of using this plugin are limited on the Internet, so you can use jconsole tool to see what to monitor. …