Ensuring zero downtime during deployment updates is a crucial requirement for modern applications. Kubernetes provides a RollingUpdate<\/strong> strategy that allows you to update applications seamlessly without disrupting users.<\/p>\n\n\n\n A rolling update<\/strong> gradually replaces old pods with new ones, ensuring that your application remains available during deployment.<\/p>\n\n\n\n Key features:<\/p>\n\n\n\n Here\u2019s a detailed example of how to deploy an application using a rolling update strategy with both readiness<\/strong> and liveness<\/strong> probes.<\/p>\n\n\n\n Consider an online shopping platform that cannot afford downtime, especially during sales events. Using the above strategy:<\/p>\n\n\n\n A rolling update strategy, combined with readiness and liveness probes, ensures that deployments occur smoothly without downtime. By leveraging these techniques, you can deliver updates with confidence while keeping services online at all times.<\/p>\n\n\n\n Would you like to explore blue-green deployments or canary releases for even more controlled rollouts? Let us know in the comments!<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction Ensuring zero downtime during deployment updates is a crucial requirement for modern applications. Kubernetes provides a RollingUpdate strategy that allows you to update applications seamlessly without disrupting users. Why Use Rolling Updates? A rolling update gradually replaces old pods with new ones, ensuring that your application remains available during deployment. Key features: Example: Kubernetes […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,216],"tags":[11,532,531,533],"class_list":["post-4075","post","type-post","status-publish","format-standard","hentry","category-kubernetes","category-kubernetes-basic","tag-kubernetes-deployment","tag-liveness-probes","tag-readiness-probes","tag-rollingupdate"],"yoast_head":"\nWhy Use Rolling Updates?<\/h2>\n\n\n\n
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Example: Kubernetes Deployment with Rolling Updates, Readiness, and Liveness Probes<\/h2>\n\n\n\n
apiVersion: apps\/v1\nkind: Deployment\nmetadata:\n name: my-app\nspec:\n replicas: 3 # Ensuring high availability\n strategy:\n type: RollingUpdate\n rollingUpdate:\n maxUnavailable: 1 # At most, 1 pod is unavailable at a time\n maxSurge: 1 # Allows 1 extra pod to be created\n selector:\n matchLabels:\n app: my-app\n template:\n metadata:\n labels:\n app: my-app\n spec:\n containers:\n - name: my-app-container\n image: my-app:v2 # New version\n ports:\n - containerPort: 80\n readinessProbe:\n httpGet:\n path: \/health\n port: 80\n initialDelaySeconds: 3\n periodSeconds: 5\n livenessProbe:\n httpGet:\n path: \/health\n port: 80\n initialDelaySeconds: 5\n periodSeconds: 10<\/code><\/pre>\n\n\n\nExplanation of Configuration:<\/h3>\n\n\n\n
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maxUnavailable: 1<\/code> ensures at least one pod is always running.<\/li>\n\n\n\nmaxSurge: 1<\/code> allows Kubernetes to create a new pod before removing an old one.<\/li>\n<\/ul>\n<\/li>\n\n\n\nmy-app:v2<\/strong><\/code>)<\/strong>: This defines the new version being deployed.<\/li>\n<\/ol>\n\n\n\nReal-World Use Case<\/h2>\n\n\n\n
E-commerce Application Deployment<\/strong><\/h3>\n\n\n\n
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Best Practices for Zero Downtime Deployment<\/h2>\n\n\n\n
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kubectl rollout status deployment my-app<\/code> to track updates.<\/li>\n\n\n\nkubectl rollout undo deployment my-app<\/code> to revert if issues arise.<\/li>\n\n\n\nConclusion<\/h2>\n\n\n\n