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…
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…
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…
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…
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…
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…
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…
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…
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