81 lines
2.5 KiB
Bash
81 lines
2.5 KiB
Bash
#!/bin/bash
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# Copyright 2016 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script is for master and node instance health monitoring, which is
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# packed in kube-manifest tarball. It is executed through a systemd service
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# in cluster/gce/gci/<master/node>.yaml. The env variables come from an env
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# file provided by the systemd service.
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set -o nounset
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set -o pipefail
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# We simply kill the process when there is a failure. Another systemd service will
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# automatically restart the process.
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function docker_monitoring {
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while [ 1 ]; do
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if ! timeout 60 docker ps > /dev/null; then
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echo "Docker daemon failed!"
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pkill docker
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# Wait for a while, as we don't want to kill it again before it is really up.
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sleep 30
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else
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sleep "${SLEEP_SECONDS}"
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fi
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done
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}
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function kubelet_monitoring {
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echo "Wait for 2 minutes for kubelet to be fuctional"
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# TODO(andyzheng0831): replace it with a more reliable method if possible.
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sleep 120
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local -r max_seconds=10
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while [ 1 ]; do
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if ! curl --insecure -m "${max_seconds}" -f -s https://127.0.0.1:${KUBELET_PORT:-10250}/healthz > /dev/null; then
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echo "Kubelet is unhealthy!"
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curl --insecure https://127.0.0.1:${KUBELET_PORT:-10250}/healthz
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pkill kubelet
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# Wait for a while, as we don't want to kill it again before it is really up.
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sleep 60
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else
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sleep "${SLEEP_SECONDS}"
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fi
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done
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}
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############## Main Function ################
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if [[ "$#" -ne 1 ]]; then
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echo "Usage: health-monitor.sh <docker/kubelet>"
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exit 1
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fi
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KUBE_ENV="/home/kubernetes/kube-env"
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if [[ ! -e "${KUBE_ENV}" ]]; then
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echo "The ${KUBE_ENV} file does not exist!! Terminate health monitoring"
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exit 1
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fi
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SLEEP_SECONDS=10
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component=$1
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echo "Start kubernetes health monitoring for ${component}"
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source "${KUBE_ENV}"
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if [[ "${component}" == "docker" ]]; then
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docker_monitoring
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elif [[ "${component}" == "kubelet" ]]; then
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kubelet_monitoring
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else
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echo "Health monitoring for component "${component}" is not supported!"
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fi
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