A CLI for managing declarative infrastructure.
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#!/usr/bin/env bash
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set -ex
# This script first loops to check if the K8s cluster is ready before applying
# airship-in-a-pod to it. Once all of the kube-system pods are ready, it applies
# the yaml and then checks every so often to determine if all of the containers
# are ready.
INTERVAL=15
# Number of statuses that the status checker is looking at
STATUS_CHECKER_NUM=3
READY=false
KUBE_READY=false
# Wait for the Kubernetes environment to become completely ready
while [[ $KUBE_READY == "false" ]];
do
# Grab the readiness from the kubectl output
kube_pods=$(kubectl get pods -n kube-system | tail -n +2 | awk '{print $2}')
for POD in $kube_pods; do
# Compare the two values to determine if each pod is completely ready
kube_ready_pod=$(echo "$POD" | cut -f1 -d/)
kube_ready_total=$(echo "$POD" | cut -f2 -d/)
if [[ "$kube_ready_pod" != "$kube_ready_total" ]]; then
# If a pod is not ready yet, break out and try again next time
KUBE_READY=false
break
fi
# This will only stay "true" as long as the previous 'if' is never reached
KUBE_READY=true
done
sleep "$INTERVAL"
done
kustomize build tools/airship-in-a-pod/examples/airshipctl | kubectl apply -f -
while [[ $READY == "false" ]];
do
# Grab the number of ready containers from the kubectl output
kubectl get pod airship-in-a-pod -o wide
readiness=$(kubectl get pods | grep airship-in-a-pod | awk '{print $2}')
ready_pod=$(echo "$readiness" | cut -f1 -d/)
ready_total=$(echo "$readiness" | cut -f2 -d/)
# if it is 7/7 ready (example with 7 containers), then mark ready
if [[ "$ready_pod" == "$ready_total" ]]; then
READY=true
fi
sleep "$INTERVAL"
done
# Now that all of the containers are ready, keep an eye on the status-checker
# container until it shows that every status succeeds, and exit on any failure
while [[ $(kubectl logs airship-in-a-pod -c status-checker --tail 1 | grep -o "SUCCESS" | wc -l) -lt ${STATUS_CHECKER_NUM} ]]
do
# If any status is listed as "FAILED" then we should kill the script with a non 0 exit code
if [[ $(kubectl logs airship-in-a-pod -c status-checker --tail 1 | grep -c -o "FAILED") -gt 0 ]]; then
kubectl logs airship-in-a-pod -c status-checker --tail 1
exit 3
fi
sleep "$INTERVAL"
done