team could develop. Not only that, he saw a lot of potential for Kubernetes and was looking for ways to extend it even further. In CustomResourceDefinitions (CRDs), Kubernetes users had a way to create birth can be traced back to February 2001, when the Agile Manifesto [1.3] was published. In many ways, the Agile Manifesto is the grandfather of DevOps. Agile development practices were a big step toward Kuber- netes and other container technologies have changed the game for DevOps practi- tioners. The ways in which Kubernetes and cloud-native systems manage immutable instances (containers) have allowed

automatically in some cases ● Argo CD provides Sync Phases and Waves to address other use cases ○ Three sync phases - Pre-sync, sync, post-sync ○ Within each phase can have multiple waves, next wave does primitives where possible: ○ Init containers ○ Jobs ○ Operators ● Argo CD Resource Hooks ○ Hooks are ways to run scripts before, during, and after a Sync operation ○ Hooks can be run: PreSync, Sync, PostSync

approach Use of internal platforms and level of DevOps evolution Source: Puppet While there are many ways to deliver resources and tools to application developers, the favorite approach of high-performing prepare for a Black Friday sale, the platform team had to start ordering additional servers two to three months in advance, and always over provision. Very short internal deadlines for big product launches

not entirely clear what exactly we mean by “use a previous commit”. Different people use different ways to rollback: 1. You can simply point your cluster to a previous Git hash and let your GitOps solution. In the case of GitOps tooling, we can handle the promotion mechanism in a different number of ways, such as introducing an automation mechanism for Pull Requests (more on this in the next section)

Kubernetes installation. This example uses three Ubuntu hosts on Digital Ocean and then installs Kubernetes with kubeadm. Sign up for Digital Ocean to receive a three month free trial (you’ll have to input PART 1: SPIN UP A KUBERNETES CLUSTER eBook 15 1. Create three droplets in Digital Ocean Sign up or log into Digital Ocean and create three Ubuntu instances with the following specifications: • Ubuntu each machine and become root (for example, run sudo su -). Install the required binaries onto all three instances: curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - cat <

0 码力 | 37 页 | 850.88 KB | 1 年前

3

the birth of designing distributed systems. Containers took the world by storm and introduced new ways to orchestrate applications. When Google open-sourced Kubernetes in 2014, it grabbed the attention

practices and enforcing strong password policies. Selecting Tools and Common Practices With these three foundational elements in mind, you are ready to select your tools and preferred practices. GitOps