All Articles

• Troubleshooting SYNs to LISTEN sockets dropped message from netstat
  
• Postfix as a SASL authenticated, TLS enabled Relay
  
• Updating Route53 records after EC2 instance restart
  
• Using LXC with OpenStack
• Deploying Prometheus for monitoring and stats collection
• Deploying MongoDB
• Deploying Apache Cassandra
• Deploying Elasticsearch cluster
• Simple Continuous Deployment System with Jenkins and Github
• Deploying services with Mesos, Marathon, Zookeeper and Docker
• Multitenant HA Redis on AWS
• Container Integration in systemd
• Fun with Linux Network Namespaces
• Deploying Apache Kafka and Apache Zookeeper
• Block device encryption with cryptsetup and LUKS
• Keepalived using unicast, track and notify scripts
• Deploying Highly Available MySQL with MHA and HAProxy
• Deploying HAProxy 1.5 from source
• Metrics visualisation and collection with Graphite, Grafana and python
• Deploying Highly Available NFS Server with DRBD and Heartbeat on Debian
• Injecting kernel modules in initrd.gz for the Debian Installer
• Creating an official Debian mirror with apt-mirror
• Creating secure LXC containers with virt-sandbox-service
• DROP versus REJECT a packet
• Diagnosing High CPU utilization and memory leaks
• Deploying OpenVZ Containers
• Connecting KVM or LXC to Open vSwitch
• Installing OpenStack Folsom on Ubuntu
• Diagnosing kernel panics with Kdump
• Troubleshooting the "Out of socket memory" error
• Building a Load Balancer with LVS - Linux Virtual Server
• Configuring LXC using libvirt
• Building HA Load Balancer with Nginx and keepalived
• Creating apt repository with reprepro on Ubuntu
• Configuring LXC - Linux Containers
• Setting Up Linux cgroups - Control Groups
• Deploying GlusterFS
• Fun with redirecting file descriptors
• Load balancing Puppet with Apache mod_proxy and mod_passenger
• Linux Interview Questions
• Accessing the contents of a KVM disk image file
• Red Hat to Debian Packaging conversion
• Building HA Load Balancer with HAProxy and keepalived
• Debian Binary Package Building
• Linux SNMP OID’s for CPU, Memory and Disk Statistics
• How to Install and use Graphite
• Building HA cluster with Pacemaker, Corosync and DRBD
• Deploying DRBD on Linux
• Counting Concurrent Connections on Linux
• Linux hugepages
• Backup and Restore a MBR
• vi cheat sheet
• LPIC 101 Certification Practice Test
• ELF executables and ld-linux.so.2
• Multipath Usage Guide for SANs
• Virtualization using KVM with libvirt on RHEL
• Magic SysRq key
• Linux TCP Tuning
• Remounting filesystem with read/write attributes
• All you need to know about /proc/sys to manipulate a running kernel
• Linux performance tuning – /proc/sys/vm/swappiness
• Linux performance tuning – /proc/sys/vm/drop_caches
• How to Install CentOS PXE server
• Linux lvm - Logical Volume Manager
• Kickstart example
• Improving IO performance with noatime
• Quick Logins with ssh Client Keys
• Forwarding Ports over ssh
• Checking On Open Files and Sockets with lsof
• Working with ISOs and CDR/CDRWs
• Tunneling: IPIP and GRE Encapsulation
• Using rsync over ssh
• Backing Up with tar over ssh
• Finding and Eliminating setuid/setgid Binaries
• Manipulating Processes Symbolically with procps
• Setting up MySQL Replication
• Routing and Alias Management with OpenLDAP and Sendmail
• Fixing disk problems under Linux with smartmontools
• Installing Xen on CentOS
• GPG Quick Start
• Public Key Cryptography with RSA
• Public Key Cryptography with Diffie-Hellman
• Public Key Cryptography with DSA
• Installing kernel source on CentOS
• Network Card Bonding On CentOS
• Centralized logging with syslog-ng over stunnel
• Centralized authentication with OpenLDAP
• Naming Network Interfaces on LInux