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71 lines
3.2 KiB
71 lines
3.2 KiB
#!bin/bash
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DEPLOYMENT_NAME=$(echo "${DEPLOY_MANIFEST}" | jq -r '.metadata.name')
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SERVICE_NAME=$(echo "${SERVICE_MANIFEST}" | jq -r '.metadata.name')
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# 1. Check if the deployment exists. If it doesn't exist, this is the initial deployment and we
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# can simply deploy without blue-green. Add the app label using jq
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out=$(kubectl get --export -o json deployment.apps/${DEPLOYMENT_NAME} 2>&1)
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if [ $? -ne 0 ]; then
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if [[ "${out}" =~ "NotFound" ]] ; then
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echo "Initial deployment"
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echo ${DEPLOY_MANIFEST} | \
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jq ".metadata.labels += {\"app.kubernetes.io/instance\": \"${APPNAME}\"}" | \
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kubectl apply -o yaml -f - || exit 1
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echo ${SERVICE_MANIFEST} | \
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jq ".metadata.labels += {\"app.kubernetes.io/instance\": \"${APPNAME}\"}" | \
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kubectl apply -o yaml -f - || exit 1
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exit 0
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fi
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echo "Failed to get deployment: ${out}"
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exit 1
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fi
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ORIGINAL_DEPLOY_MANIFEST=$out
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# 2. Clone the original, running deployment to a temporary deployment, with tweaks to its name and
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# selectors. The jq command carries over all labels and selectors and appends the `-temp` suffix.
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TMP_DEPLOYMENT_NAME="${DEPLOYMENT_NAME}-temp"
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echo ${ORIGINAL_DEPLOY_MANIFEST} | jq -r '.metadata.name+="-temp" |
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.spec.template.metadata.labels += (.spec.template.metadata.labels | to_entries | map(.value+="-temp") | from_entries) |
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.spec.selector.matchLabels += (.spec.selector.matchLabels | to_entries | map(.value+="-temp") | from_entries)' |
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kubectl apply -f -
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# 3. Wait for cloned deployment to become ready.
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sleep 2
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echo "Waiting for successful rollout of new (temporary) deployment"
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kubectl rollout status --watch=true deployments.apps/${TMP_DEPLOYMENT_NAME} || exit 1
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echo "Rollout of temporary deployment successful"
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# 4. Patch the service object such that all traffic is redirected to the cloned, temporary
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# deployment. After this step, the original deployment will no longer be receiving traffic.
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kubectl get service ${SERVICE_NAME} --export -o json | \
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jq '.spec.selector = (.spec.selector | with_entries(.value+="-temp"))' |
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kubectl apply -f - || exit 1
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sleep 5 # Sleep slightly to allow iptables to get propagated to all nodes in the cluster
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# 5. Update the original deployment (now receiving no traffic) with the new manifest
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echo "Updating original deployment"
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echo ${DEPLOY_MANIFEST} | \
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jq ".metadata.labels += {\"app.kubernetes.io/instance\": \"${APPNAME}\"}" | \
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kubectl apply -f - || exit 1
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# 6. Wait for the new deployment to become complete
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sleep 2
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echo "Waiting for successful rollout of new deployment"
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kubectl rollout status --watch=true deployments.apps/${DEPLOYMENT_NAME} || exit 1
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echo "Rollout of new deployment successful"
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# dummy wait step for demo purposes
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echo "sleeping for 30 seconds"
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sleep 30
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# 7. Apply the new service object. Traffic will be redirected to the new version of the deployment
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echo "Updating original service object"
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echo ${SERVICE_MANIFEST} | \
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jq ".metadata.labels += {\"app.kubernetes.io/instance\": \"${APPNAME}\"}" | \
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kubectl apply -f - || exit 1
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sleep 10
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# 8. Remove the cloned deployment, which is no longer receiving any traffic
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echo "Deleting ephemeral deployment"
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kubectl delete deployments/${TMP_DEPLOYMENT_NAME} --ignore-not-found=true || exit 1
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