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DevOps - Infrastructure as Code

No plan resists first contact with reality

No plan resists first contact with reality Unless you’re repeating a well-established process, you can only plan ahead so much . And even if you are very careful and thorough, the universe, Fate, Karma, or whatever personal beliefs you hold to will eventually render your beautiful plan obsolete and unrealistic. When you face a new…

DevOps - Infrastructure as Code

November All hands meeting: Jenkins guidelines

Last week we had our “All hands meeting”, consisting of a video call with all the team members. We use these meetings to report what’s going on here at flugel, to share knowledge, and to define some general guidelines. In this case, it was time to review how we deploy pipelines based on Jenkins. The…

DevOps - Infrastructure as Code

Failover is dead

When doing a quick Google search of the keywords “failover meaning”, you will find this definition: “a procedure by which a system automatically transfers control to a duplicate system when it detects a fault or failure.” The definition is perfect, but the concept is broken. Failover is broken. It was ostensibly a good idea years…

Linux

Preseed notes: autopartition with LVM

Working with preseed can be so so frustrating, but once you start to get the hang of it starts to make sense. Here are some notes, and more important some examples for you to use, feel free to comment. For this example keep in mind this: Disk device here is “/dev/vda” We’re going to set…

OpenStack

OpenStack: Dell Equallogic controlled by Cinder

Last week a client arrived with new hardware. A Dell Equallogic PS6210XS storage that should be integrated to OpenStack. It was the first time with this model but it worked in the first shoot. In the [DEFAULT] section of cinder.conf we added: [codesyntax lang=”ini”] volume_driver = cinder.volume.drivers.eqlx.DellEQLSanISCSIDriver san_ip = 10.10.10.10 san_login: grpadmin san_password: grpadmin eqlx_group_name: groupname1 eqlx_pool: poolname1 [/codesyntax] Cinder was restarted…

DevOps - Infrastructure as Code

To use or not to use… Cloud Services

Introduction Recently we’ve been asked to help to decide whether a client should move all their deployment cycle to a cloud provider, or keep some parts In-house, specially Continuous Integration / Continuous Delivery (CI/CD) tasks. This gives me the opportunity to think about a broader matter rather than a particular case. Nowadays it is really…

DevOps - Infrastructure as Code

SaltStack and Terraform: Installing Minions in ec2 instances

Terraform is a great orchestration tool and SaltStack is great configuration management software. The first one allows you to create resources in the cloud (instances, load balancer, databases, etc) and the second is used to provision the instances. Salt works in a master-agent mode, the agents are called minions. To provision an instance you have…

DevOps - Infrastructure as Code

Centos7, Rackspace and kswap0

I’ve just started to test an application from one my clients in CentOS 7. A Python app that runs on Python 2.7 that is the default version in the latest version of CentOS/RHEL. As usual, all the cloud providers don’t configure the swap space by default, so I have to configure Chef to create it…

Infrastructure as Code

Chef: How to regenerate the validation key

Today I’ve lost the Chef validation key of one the servers that we have around. I haven’t found how to recover it in a quick Google search, so… good reason to write this short post. The validation “thing”, is a client (not an user) in Chef which has permission to register new Chef clients to…

Infrastructure as Code

Salt and the bash security issue

Yesterday was published a Bash security issue. Details here. So, we needed to upgrade your instance very quickly. Thanksfully, we have SaltStack managing it. The procedure was simple as described below. To update our systems with Salt, just run: salt ‘*’ pkg.install bash refresh=True And to be sure that new nodes are deployed with the…