Martin Schmitter

Architecture illustration of a Minecraft server on Oracle Cloud Infrastructure with Podman

July 9, 2026 Martin Schmitter

Minecraft Server on OCI Free Tier with Rootless Podman

My ten-year-old son wanted a Minecraft server for playing online with friends. I wanted something small, controlled, allowlisted, and useful as a real-world excuse to run rootless Podman with systemd on an Oracle OCI Free Tier ARM instance.

DOAG 2024 speaker banner for a session about connecting a home office with Oracle Cloud

November 29, 2024 Martin Schmitter

Connect Your Home Office to Oracle Cloud – DOAG 2024

On Tuesday, November 19, 2024, I had the opportunity to speak about Oracle Cloud. Have you ever wondered how to

Illustration of a virtual firewall appliance protecting public and private cloud network segments on Oracle Cloud Infrastructure.

June 12, 2024 Martin Schmitter

Install OPNsense® on Oracle Cloud Infrastructure (OCI)

Easily install OPNsense® on Oracle Cloud Infrastructure (OCI) to secure your cloud environment with a community-driven firewall solution.

November 21, 2022 Martin Schmitter

Interview: Oracle 11gR2 nach 19c migrieren

Interview: Migration von 11.2 auf 19c – von Single Instance zur CDB/PDB

Illustration of OSPF route exchange between a cloud router and a home router over a secure WireGuard IPv6 tunnel.

May 1, 2022 Martin Schmitter

WireGuard VPN over IPv6 with OSPF on OCI – Part IV

This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part IV is focused on routing and OSPF.

WireGuard home router setup over IPv6 with OSPF

February 27, 2022 Martin Schmitter

WireGuard VPN over IPv6 with OSPF on OCI – Part III

This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part III is focused on the WireGuard setup and configuration of the home router. In my case it’s an EdgeRouter™-X with version 2.0.9.

Router configured for a WireGuard VPN over IPv6 with OSPF

February 21, 2022 Martin Schmitter

WireGuard VPN over IPv6 with OSPF on OCI – Part II

This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part II is focused on WireGuard setup and configuration in the cloud.

Abstract database monitoring illustration showing background process activity and rising memory pressure related to Oracle 19.12 EMON PGA usage.

February 9, 2022 Martin Schmitter

Oracle 19.12 EMON large consumption of PGA memory

How to troubleshoot excessive PGA memory usage by Oracle 19.12 EMON/Q processes after the July 2021 RU, including AQ queue checks and the DBMS_AQADM workaround.

WireGuard VPN over IPv6 with OSPF on Oracle Cloud Free Tier - Part I: OCI Preparation

February 1, 2022 Martin Schmitter

WireGuard VPN over IPv6 with OSPF on OCI – Part I

This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier

Illustration of Oracle RAC maintenance where client sessions are disconnected from a node in maintenance and service traffic continues on the active node.

September 7, 2021 Martin Schmitter

Disconnect Oracle Database Sessions with srvctl and DBMS_SERVICE

How to disconnect long-running Oracle database sessions during RAC maintenance using srvctl stop service and DBMS_SERVICE.DISCONNECT_SESSION.

Illustration of Oracle RAC connection pooling with load balancing across cluster nodes and a failover path to an available node.

November 21, 2013 Martin Schmitter

Oracle Real Application Cluster: Connecting and using RAC

Eine wiederveröffentlichte DOAG-2013-Präsentation über Oracle RAC, Load Balancing, Failover und die richtige Nutzung von RAC-Verbindungsmechanismen auf Anwendungsebene.