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Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface, provides built-in health checks, and more. It also includes a key-value store similar to Etcd or Zookeeper. I’m starting to think of a local Consul agent – either running in client or server mode –
The animated gif* demo below shows: observe a master node failure (consul health checks) promote a slave to become master configure other slaves to the new master configure the original master to become a slave (if it ever awakens/returns to the cluster) And all without touching my configuration management tool (which is BOSH in this
Update: instructions are even simpler thanks to consul v0.3.1+; and releases v5+ of consul-boshrelease. This post documents the old two deployment-step sequence. As of v5 there is now only one deployment required. See the project README. Whether you’re a BOSH user already or not, you might be interested to use it to boot your stable
This article is a continuation of investigations into service discovery, which started 3 days earlier with The world’s quickest demonstration of consul. One side of DNS is the ability for clients to find backend services/web apps without knowing implementation details: the IP addresses of host machines. The flipside is equally important: the ability for the
Continuing to explore consul for service discovery, I added some health checks to the redis cluster from the previous post (World’s quickest demo of consul). As you can see below if a health check is critical, then the service is removed from the DNS listing. If a health check is a warning, then it continues
So, I spent an unreasonable amount of time attempting to automate the install of MySQL 5.6 for a client. Apparently one of the newer features in MySQL is the creation of a temporary password file when MySQL is first intalled. I want to use this password file to reset the root password as the root
"What is service discovery?" and "Should I investigate consul?" are questions for another day. Today is the day for the world’s quickest demonstration* of advertising a master-slave-slave redis cluster across consul. *No effort was made to verify this claim. Step-by-step: It shows a running cluster of consul servers Sadly, there is no redis service available.
It its popular to reference a PostgreSQL database with credentials via a URI, but neither psq –help nor man psql (v9.3.4) indicate how to do it. @yann_ck showed me you can pass it as the first argument: $ psql postgres://USERNAME:[email protected]:5432/jszlmeae psql (9.3.4, server 9.2.8) SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256) Type "help" for help. jszlmeae=>
Ghost is a lovely blogging application that is open source, requires only Node.js, a SQL database and an optional STMP/email service. Perfect for running on Cloud Foundry. So we migrated the static/jekyll Stark & Wayne website to Ghost and its now running on Pivotal Web Services. Here’s how… Follow these instructions to install Node.js &