List of All Blog Posts

• Regenerate Expired Puppet Master Certificate
• Revive an Expired Puppet CA with Certregen
• Create a Swap File on Linux with dd Command
• 10th Website Anniversary
• Grafana with Azure AD and AWS Cognito
• Gaining SSH Access to TP-Link RE200 Wi-Fi Range Extender
• Kubernetes Cluster Hardening: Set Minimum TLS Version to 1.3
• How to Mount an AWS S3 Bucket Locally on Linux Using Mountpoint
• libcrypt.so.1: cannot open shared object file when upgrading from Debian Buster to Bullseye
• Migrating HA Kubernetes Cluster from Rocky Linux 8 to Rocky Linux 9
• Configure PXE Boot Server for Rocky Linux 9/CentOS 9 Kickstart Installation
• Get Rid of Ubuntu Pro Advertisement when Updating Apt
• Mongo Shell SyntaxError Identifier Directly After Number
• Replacing a Failed Control Plane Node in a HA Kubernetes Cluster
• Reset the Licensing Status of a Windows Server Machine
• Kiali Does Not See istio-ingressgateway Installed in Separate Kubernetes Namespace
• Passed CKAD Exam
• Upgrading Homelab Kubernetes Cluster from 1.24 to 1.25
• Install OpenVAS on Rocky Linux 8/CentOS 8
• Passed EX180 Containers and Kubernetes
• EX180 Series: Deploying Applications to OpenShift
• EX180 Series: Deploying a Rootless Multi-Container WordPress Application with Podman
• EX180 Series: Using Podman to Build Images and Run Containers
• EX180 Series: Install Podman and Set up OpenShift Using CodeReady Containers
• Reload Prometheus ConfigMap without Restarting the Kubernetes Pod
• Configure Docker Daemon to Use HTTP Proxy
• Install ESET Antivirus on macOS via CLI
• Upgrading Homelab Kubernetes Cluster from 1.23 to 1.24
• Build and Install OpenLens on Linux
• Kubernetes Liveness Probe Saves the Day
• Speed up Ansible SSH with Multiplexing
• How to Download View-Only Teams Meeting Recording Video from SharePoint
• Rocky Linux 9 Kernel Panic on Packer Launched qemu-kvm
• Backup Kubernetes Cluster Resources to AWS S3 with Velero
• Deploy Elasticsearch and Kibana on Kubernetes with Helm
• Upgrading Homelab Kubernetes Cluster from 1.22 to 1.23
• Building Qemu KVM Images with Packer
• Passed CKA Exam
• CKA Practice Questions
• OpenVPN Server on Kubernetes
• Speedtest with InfluxDB and Grafana on Kubernetes
• Add Second Disk to Existing TrueNAS Pool in Mirror Configuration (RAID1)
• Upgrading Homelab Kubernetes Cluster from 1.21 to 1.22
• Install Kubecost to Help Optimise Kubernetes Applications
• Use External Labels with Prometheus Alerts
• Blue/Green Deployment with Istio: Match Host Header and sourceLabels for Pod to Pod Communication
• Migrating HA Kubernetes Cluster from CentOS 7 to Rocky Linux 8
• Configure PXE Boot Server for Rocky Linux 8/CentOS 8 Kickstart Installation
• Upgrading Homelab Kubernetes Cluster from 1.20 to 1.21
• Moving to TrueNAS and Democratic CSI for Kubernetes Persistent Storage
• AWS EKS AccessDenied: The aws-auth ConfigMap in your cluster is invalid
• Install MetalLB and Istio Ingress Gateway with Mutual TLS for Kubernetes
• Upgrading Homelab Kubernetes Cluster from 1.19 to 1.20
• Install a Multi-Master Kubernetes Cluster with Ansible
• How to use Hyphens in Systemd Mount Points
• Create Your Own Certificate Authority (CA) for Homelab Environment
• Monitor Mikrotik Router with Grafana and Prometheus (mikrotik-exporter)
• Install and Configure Alertmanager with Slack Integration on Kubernetes
• Install Kube State Metrics on Kubernetes
• Monitor Linux Servers with Grafana and Prometheus (node_exporter)
• Monitor HAProxy with Grafana and Prometheus (haproxy_exporter)
• Monitor Bind DNS Server with Grafana and Prometheus (bind_exporter)
• Monitor Etcd Cluster with Grafana and Prometheus
• Passed AWS Solutions Architect Associate Exam (SAA-C02)
• Install and Configure Grafana on Kubernetes
• Install and Configure Prometheus Monitoring on Kubernetes
• Install Kubernetes Dashboard
• Install and Configure a Multi-Master HA Kubernetes Cluster with kubeadm, HAProxy and Keepalived on CentOS 7
• Install and Configure a PXE Boot Server for Kickstart Installation on CentOS 7
• Configure Kubelet Out of Resource Handling, or How to Stop EKS Kubernetes Nodes from Going Down
• Disable Suspend Mode on Laptop Lid Close with Ansible and Systemd
• Terraform with AWS S3 and DynamoDB for Remote State Files
• Install Kubernetes Cluster with Ansible
• Manage Windows Servers with Ansible
• Automate Windows Server Setup with Windows Unattended Install
• Keycloak with Okta IDP Initiated SSO Login
• Create a Keycloak Realm Using Admin REST API
• Deploy Keycloak Using Docker Swarm
• Change the Default Docker Subnet with SystemD
• Anthy Keyboard to Write in Hiragana and not Katakana
• Passed EX220 Hybrid Cloud Management
• OpenShift: Create Edge Secured Route
• OpenShift: Create a Service Account
• OpenShift: Working with Internal Docker Registry
• Passed EX280 OpenShift Administration
• Minishift on Linux with VirtualBox
• Road to RHCA Epilog: How I Became a Red Hat Certified Architect
• Passed EX415 Security
• Inspecting Audit Logs with ausearch and aureport
• Auditing the SELinux Policy with sesearch
• Controlling Authentication with PAM
• Configure Audit Service to Send Audit Messages to Another Server
• Passed EX403 Deployment and Systems Management with Satellite
• Passed EX407 Ansible Automation
• Ansible Sample Exam for RHCE EX294 and EX407
• Ansible: Generate Crypted Passwords for the User Module
• Ansible: Use hostvars to Generate Hosts File
• Ansible EX407 Exam Booked
• Why Free Trial of RHLS is Good News
• Getting Started with Azure CLI: Build a 3-Tier Network
• Ansible Dynamic Inventory for Proxmox
• Passed EX405 Configuration Management with Puppet
• Passed EX436 High Availability Clustering
• First Bump in the Road and Second RHCA Exam
• High Availability Pacemaker Cluster Monitoring
• High Availability Pacemaker Cluster Logging
• The Start of the RHCA Journey
• Libvirt Fencing on a Physical KVM Host
• 5th Website Anniversary
• MySQL Replication and MEMORY Tables
• Katello: Security Compliance Management with OpenSCAP
• Configure HAProxy and Keepalived with Puppet
• Configure Apache Server and Deploy WordPress with Puppet
• Configure Active/Passive NFS Server on a Pacemaker Cluster with Puppet
• Configure MySQL Replication with Puppet
• Configure Graylog Server with Puppet
• Configure Zabbix Monitoring Server with Puppet
• Configure OpenLDAP Master/Slave Replication with Puppet
• Katello: Separate Lifecycle for Puppet Modules
• Katello: Working with Puppet Modules and Creating the Main Manifest
• Katello: Create a Domain, Subnet, Installation Media, OS, Provisioning Templates, Host Groups, PXE Boot
• Katello: Import CentOS Errata into Pulp
• Katello: Create Products, Repositories, Content Views, Lifecycle Environments, Activation Keys
• Configure Postfix to Relay Mail to an External SMTP Server on CentOS 7
• Configure Peered NTP Servers on CentOS 7
• Configure DHCP Failover with Dynamic DNS on CentOS 7
• Configure Bind DNS Servers with Failover and Dynamic Updates on CentOS 7
• Homelab Project with KVM, Katello and Puppet
• Basic Python Script to Log in to Website Using Selenium Webdriver
• Analyse Cisco ASA Firewall Logs with Graylog
• Compile Apache Tomcat mod_jk on CentOS
• Monitoring Tomcat with Nagios Core and jmx4perl
• Nagios Core Upgrade on CentOS 7
• CentOS 7 Server Hardening Guide
• Nagiosgraph with Nagios Core: Graph Icons not Visible
• Setting up a NetApp NFSv4 Share for Linux Guests
• Set up MongoDB Authentication for Graylog
• Configure Tripwire on CentOS 7
• Send Squid Logs to Graylog
• Send Apache Logs to Graylog
• Configure AWS NAT Gateway for Lambda Functions to Access Public SQS Queues from VPC
• Graylog Server Upgrade from 1.3.x to 2.0.x on CentOS 6
• Create Local YUM Repository from Systemd Mounted DVD on RHEL 7
• Dirty COW (CVE-2016-5195): Recompile Linux Kernel 4.2 with the Fix Applied
• Build and Import Puppet Modules into Katello
• Set up Wake On LAN (WOL) on CentOS 7
• Configure IIS 8 and Tomcat Connector ISAPI Filter on Windows Server 2012
• Install Katello on CentOS 7
• Configure Public Bridge Guest Networking in KVM on Debian Jessie
• Install Puppet Enterprise (PE) Server on RHEL 7
• Passed RHCE on RHEL 7
• Configure Host-based and User-based Security for the Service on RHEL 7
• Setting up Time Synchronisation with Chrony on RHEL 7
• Configure Remote Logging on RHEL 7
• Setting up a Software Bridge on Top of a Teamed Device on RHEL 7
• RHCE Sample Exam for RHEL 7
• Firewalld Rich and Direct Rules: Setting up RHEL 7 Server as a Router
• Setting up a MariaDB Server with SELinux on RHEL 7
• Setting up an OpenSSH Server with SELinux on RHEL 7
• Setting up a Samba Server with SELinux on RHEL 7
• Setting up a Kerberised NFS Server on RHEL 7
• Configure Postfix on RHEL 7 to Forward All Email to a Central Mail Server
• Setting up a Caching-only DNS Server on RHEL 7
• Advanced Apache Configuration with SELinux on RHEL 7
• Configure Unique Local IPv6 Addresses on RHEL 7
• Configure Aggregated Network Links on RHEL 7: Bonding and Teaming
• iSCSI Target and Initiator Configuration on RHEL 7
• Getting Started with KVM on Debian Jessie
• Setting up LDAP and Kerberos Client Authentication on RHEL 7 (using sssd)
• Setting up LDAP and Kerberos Client Authentication on RHEL 7 (using nslcd)
• Setting up a FreeIPA Server on RHEL 7
• Xen Live Migration with DRBD on Debian Jessie: Part 3 – DRBD
• Xen Live Migration with DRBD on Debian Jessie: Part 2 – DomU
• Xen Live Migration with DRBD on Debian Jessie: Part 1 – Dom0
• Setting up an OpenLDAP Server with SSL + NFS for User Home Directories on CentOS 7
• Set up LDAP Authentication with nslcd on CentOS 7
• Set up NFS Server on CentOS 7 and Configure Client Automount
• Setting up an O2CB Cluster with Dual Primary DRBD and OCFS2 on Oracle Linux 7
• Active/Active High Availability Pacemaker Cluster with GFS2 and iSCSI Shared Storage on CentOS 7
• Fixing Sendmail: fatal: setrlimit: Permission denied
• Active/Passive MySQL High Availability Pacemaker Cluster with DRBD on CentOS 7
• Active Node Not Updated by Virtual Server: Simpana cvclusternotify on Unix Failover
• Resize GPT Multipath Disk with Parted on CentOS 6
• Active/Passive Cluster With Pacemaker, Corosync and DRBD on CentOS 7: Part 4 – Configure Fencing (STONITH)
• Active/Passive Cluster With Pacemaker, Corosync and DRBD on CentOS 7: Part 3 – Replicate Storage with DRBD
• Active/Passive Cluster With Pacemaker, Corosync and DRBD on CentOS 7: Part 2 – Add and Configure Resources
• Active/Passive Cluster With Pacemaker, Corosync and DRBD on CentOS 7: Part 1 – Cluster Installation
• Install Graylog Server 1.x on CentOS 7
• No WiFi on Dell Inspiron 5559 with Debian Jessie and Kernel 4.2
• No Sound on Dell Inspiron 5559 (Intel Corporation Device 9d70) with Linux
• Setting up a Load-Balancing Cluster with Heartbeat and Ldirectord
• Set up CentOS 6 Linux Server as a Router Using Iptables
• Setting up a Load-Balancing HAProxy Cluster with Keepalived
• Setting up a Load-Balancing LVS (Direct Routing) Cluster with Piranha
• Setting up a Load-Balancing LVS (NAT) Cluster with Piranha
• Compile and Install Nasty on Debian
• High Availability Concepts and Theory
• Set up NFS Server on CentOS 6
• Set up Puppet Server with Hiera on CentOS 6
• Set up Spacewalk 2.4 on CentOS 6
• Set up Postfix to Relay Mail to an External SMTP Server on CentOS 6
• Set up DHCP Server on CentOS 6
• Set up NTP Server on CentOS 6
• Set up BIND DNS Server on CentOS 6
• Set up VirtualBox 5.0 on a Headless CentOS 6 Server
• Set up Linux Home Lab Environment with Oracle VirtualBox
• Install psad on CentOS 6
• Set up Spacewalk 2.3 on CentOS 6
• Install Graylog Server 1.x on CentOS 6
• Your Satellite Certificate has Expired (Spacewalk)
• Reset Forgotten MySQL Root Password
• Optimise MySQL Configuration for WordPress
• Kernel Sysctl Configuration for Linux
• Getting an “A+” on Qualys SSL Labs with Apache 2.2 on Debian
• Configure Security Limits on a Debian Server
• Install AWStats on Debian
• Install Commvault Simpana File System iDataAgent on CentOS 6
• Configure fault-tolerance Network Bonding on Oracle Linux
• Oracle Linux iSCSI Installation and Configuration
• Extend an ext4 LVM root Volume
• Prevent Logjam in Apache 2.2 on CentOS 6
• Install DNN7 on Windows Server 2008
• Install Kivy 1.8 on Debian
• Compile and Install Ettercap on Debian
• Cannot add duplicate collection entry of type ‘mimeMap’ with unique key attribute ‘fileExtension’ set to ‘.json’
• Compile and Install Exim from Source with LDAP and MySQL Lookup Support on Ubuntu 14.04
• Parsing IIS Server Logs with Log Parser
• Convert OpenLDAP Schema to LDIF
• Upgrade Zabbix 1.8 to 2.2 on Ubuntu
• OpenSSH SSH Client Configuration
• Create a Subject Alternative Name (SAN) CSR with OpenSSL
• Install Xorg and Xfce on a Gentoo Linux
• Install Gentoo Linux from Debian
• Postfix + Courier IMAP + MySQL + SASL + TLS on Debian
• Install NFS and Configure Shares on Debian
• SQL Server 2014 Reporting Services Fail to Bind to SSL
• Encrypted Swap on Debian
• Configure AWS IAM User Account to Send Emails via SES by Using AWS CLI
• Setting up ProFTPd with OpenLDAP Authentication on Debian
• Configure Squid for OpenLDAP Authentication
• Install and Configure an OpenLDAP Server with SSL on Debian
• Disable SSLv3 (POODLE Vulnerability) on Nginx, Apache and IIS
• Amazon SES SMTP Outbound Email Configuration with SSMTP on Debian
• Convert IAM Secret Access Key to SES SMTP Password in Bash
• Move tempdb on MSSQL Server 2008
• Web Application and Server Security Testing on Ubuntu 14.04 with Lynis, Nmap, Nikto, Wapiti, w3af, Arachni and Skipfish
• Prevent IE from Changing .apk, .xap and .ipa Extensions to .zip (Apache)
• Configure BIND as a Catching-only DNS Server on Debian
• Disk Cleanup on Windows Server 2008 Without Installing Desktop Experience
• Installation Notes for WordPress (Apache, MySQL, ProFTPd)
• Migrate MySQL RDS Instance from One AWS Account to Another
• Amazon Elastic Load Balancer on a root Domain (Route53)
• Recovering Windows Server Licences from Key Management Server (KMS) on Amazon EC2
• Custom IAM Policies for AWS
• Finding Spamming IPs on Exim Mail Server
• Install and Configure Samba Server on Debian
• Skype 2.2/4.2 “Server connect failed” on Linux
• Find Largest Mailboxes on Exchange 2010 (PowerShell)
• Install and Configure Squid3 Caching Proxy on Debian
• GRUB2 Rescue Mode “error: unknown filesystem”
• Nginx Reverse Proxy for Apache2 (LAMP) with TLS/SSL on Debian
• Limit Bandwidth on Mikrotik with Simple Queue
• Grant an Exchange 2010 Administrator Paswordless Access to User’s Mailbox (PowerShell)
• Configure Iptables Firewall on a Debian PC
• “Unknown phone dialed ***” Switchvox Dial Plan
• Peering Switchvox and Asterisk using IAX
• Rebuild initrd Image (Linux)
• Build and Install Dahdi Framework on Switchvox (CentOS 5)
• Create Switchvox (CentOS 5) EC2 EBS AMI with root Partition on LVM
• Fix “This webpage has a redirect loop” Moodle v2.7
• Enable Remote Commands in Windows PowerShell (Windows Remote Management)
• Pepper Flash Player for Chromium v35 on Debian Linux
• Office Professional Plus 2010 on a Terminal Server (RemoteApp)
• Upgrade from Mediawiki v1.21 to Mediawiki v1.23.0 on Debian
• SNMP on Mikrotik RB751G-2HnD Router
• Convert P7B to PFX with OpenSSL
• Connect to WPA/WPA2 Secured Wireless Network on Debian Using Command Line
• Compile and Install Ncrack 0.4 Alpha on Debian
• Set up DenyHosts with Email Notifications on Debian
• Get Windows System Information via WMI Command-line (WMIC)
• Mount Remote Filesystem with SSHFS on Debian
• Using Smartctl, Smartd and Hddtemp on Debian
• Using Linux LVM on Amazon EC2 Ubuntu Server
• Share Exchange 2010 Mailbox Calendar with Other Users (PowerShell)
• Setup VoIPmonitor on Ubuntu 12.04 LTS
• Configure Wildcard SSL Certificate for POP/IMAP on Exchange 2010 (PowerShell)
• VirtualBox 4.1 on a Headless Debian Server
• Install PHP IonCube Loader for Nginx (Ubuntu)
• XenApp 7.5 “Fail worker callback using SPN HOST/ and IP address”
• XenApp 7.5 Error XDDS:EEBF43DB “DesktopStudio_ErrorId : DatabaseNotConfigured”
• Change Default RDP Port on Windows Server 2008/2012
• Fix “java.lang.OutOfMemoryError: Java heap space” for Jenkins
• Conky IMAPS Configuration with Stunell on Debian
• Create and Attach a Second Elastic Network Interface with EIP to EC2 VPC Instance (with Routing)
• The Uselessness of Amazon EC2 Instance System Log
• So what is the size of that file? Sparse Files on Linux
• Using Subversion (SVN) CLI on Linux
• Send Email From Windows PowerShell
• Dual Monitor on XFCE
• Measure and Troubleshoot Linux Network Resource Usage
• Setup Brother HL-4150CDN Printer with CUPS on a 64-bit Debian Machine
• Measure and Troubleshoot Linux Disk I/O Resource Usage
• Measure and Troubleshoot Linux Memory Resource Usage
• Measure and Troubleshoot Linux CPU Resource Usage
• Install Oracle’s Instant Client 12.1 and Oracle SQL Plus on Ubuntu 12.04 x64
• Tune up Mediawiki v1.21 Installation for a Personal Usage
• Create a Systemd Service to Send Automatic Emails When Arch Linux Restarts
• Find and Remove All Non-Empty Directories with Windows Command Prompt
• Install WiKID Strong Authentication Community Server 3.5.0 on Ubuntu 13.10 Saucy Salamander
• Backup All Route53 Hosted Zones and Put on S3 with Debian
• Process Text Streams Using Sed on Linux
• Simple Python Script to Start and Stop Amazon AWS Instances
• My Linux Bash Script to Upload Encrypted MySQL Backups to Remote FTPS Server
• Fix “Host key verification failed” Error When Launching Jenkins Slave via SSH
• Delete a Linux Software Raid Array
• Set up Linux Software RAID10 to Store MySQL Data Files and Databases
• Setting up ProFTPD on Debian with Explicit FTPS and Alternate mod_auth_file File
• Install Nessus Vulnerability Scanner on Debian
• Increase Rules Size Limit for Exchange 2010 Mailboxes (PowerShell)
• Automate ClamAV to Perform Daily System Scan and Send Email Notifications on Linux
• Simple Fix for Moodle “ERROR: This script no longer supports CLI, please use admin/cli/cron.php instead”
• OpenVPN Server and Client Setup on Windows
• Install NTOP on Debian and Configure to Use NetFlow on Mikrotik RouterOS
• Add New User on Mac OS X Mountain Lion via CLI
• Install Java (jre-7u60) on Mac OS X Mountain Lion via CLI
• Remotely Wipe a Mobile Phone Connected to Exchange 2010
• Get Python 2.7 to Work with AWS and MSSQL 2008 R2
• Fix Boot MBR in Windows 7
• VLC 2.0.3 Fails to Play Youtube Videos on Debian
• Extend an Encrypted LUKS Partition
• Manually and Automatically Configure Network Interfaces on Linux
• Change Grub2 Backgroud Image on Debian Startup
• Zoneminder Installation on Debian with Logitech QuickCam Pro 5000
• Shrink MSSQL Logs and Rebuild Database Table Indexes
• Compile and Install Linux Kernel 3.12.5 on Debian Wheezy
• OpenVPN Client Setup on Linux
• OpenVPN Server Setup on Linux
• Installing Zabbix 1.8.19 From Source on Debian with PHP Frontend and HTTPS (LAMP Stack)
• OpenSSH Server Installation and Configuration
• Configure Passive FTP on IIS6
• Finding Open Ports and Listening Services on Linux: Nmap, Netstat, lsof and ss
• Fundamentals of Internet Protocols (IPv4)
• Alien: Converting Between Package Formats
• Exploring Linux Hard and Symbolic Links
• LUKS: Add a Backup Key, Backup, Restore and Delete LUKS Volume Header
• Install LUKS and Create an Encrypted LUKS Partition on Debian
• Installing WebKeePass on a Debian Server
• Exploring Linux Runlevels and Their Purposes (SysVinit)
• Set up Wake On LAN (WOL) on a Debian Server
• Move Mediawiki from Debian to Arch Linux Server (Raspberry Pi)
• Set up LAMP on Arch Linux (Raspberry Pi)
• Setting up Logwatch, SSMTP and Iptables or Arch Linux (Raspberry Pi)
• Tune up Arch Linux Installation on Raspberry Pi
• The Pilot