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The Ansible In Depth white paper outlines Ansible’s use cases in four categories: Configuration management Application deployment Orchestration: for coordinating a multi-machine process such as interacting with load balancer and rolling cluster upgrade As-needed task execution: ad-hoc tasks on large number of hosts At work, my original automation scheme involves several Ansible Playbooks that started … Read moreAnsible at scale 1 of 2
This article is my experience with memory balloon on virtual machine. I came across an ElasticSearch server (ESXi guest with 32GB physical memory) where the main process keeps dying of OOM. Even worse, after the OOM event, the free memory left is about 10G and Elastic Search cannot start because its JVM is set with … Read moreBalloon steals memory from virtual machines
There are too many metrics that describes some aspects about memory in Linux. Further to an old article on this site, where several concepts were discussed, this posting will make sense of those common metrics in Linux, CentOS as an example. The most fundamental command is free and my favourite switch is -h for human … Read moreHow memory usage adds up in Linux
This article explains how two most common authentication mechanisms (NTLM and Kerberos) work. Both authentication protocols are based on symmetric key cryptography. The protocols themselves are platform independent. NTLM Authentication NTLM is the default authentication protocol prior to Windows 2000 and still prevalent today as backup to Kerberos. It is based on challenge/response mechanism. User … Read moreNTLM and Kerberos protocols
Introduction Authentication is used in many protocols (such as LDAP binding) and it usually involves sending password. Given the nature of authentication protocol, its traffic encryption is usually mandatory. Simple Authentication and Security Layer (SASL) is introduced to ensure the security during authentication. It is not a single protocol, but rather a framework for authentication … Read moreSASL Authentication Mechanisms
What for Someone who I maintain website for realized the bill of a public cloud provider isn’t exactly as expected. The computing resource falls under “free tier” but the disk isn’t. And the cost of disk usage is the surprise. Second, WordPress does a good job building the initial website but requires a hosting EC2 … Read moreMigrate WordPress to static website