81 lines
2.4 KiB
Bash
81 lines
2.4 KiB
Bash
#!/bin/bash
|
|
|
|
# Copyright 2016 The Kubernetes Authors.
|
|
#
|
|
# 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.
|
|
|
|
# This script is for master and node instance health monitoring, which is
|
|
# packed in kube-manifest tarball. It is executed through a systemd service
|
|
# in cluster/gce/gci/<master/node>.yaml. The env variables come from an env
|
|
# file provided by the systemd service.
|
|
|
|
set -o nounset
|
|
set -o pipefail
|
|
|
|
# We simply kill the process when there is a failure. Another systemd service will
|
|
# automatically restart the process.
|
|
function docker_monitoring {
|
|
while [ 1 ]; do
|
|
if ! timeout 60 docker ps > /dev/null; then
|
|
echo "Docker daemon failed!"
|
|
pkill docker
|
|
# Wait for a while, as we don't want to kill it again before it is really up.
|
|
sleep 30
|
|
else
|
|
sleep "${SLEEP_SECONDS}"
|
|
fi
|
|
done
|
|
}
|
|
|
|
function kubelet_monitoring {
|
|
echo "Wait for 2 minutes for kubelet to be functional"
|
|
# TODO(andyzheng0831): replace it with a more reliable method if possible.
|
|
sleep 120
|
|
local -r max_seconds=10
|
|
while [ 1 ]; do
|
|
if ! curl -m "${max_seconds}" -f -s http://127.0.0.1:10255/healthz > /dev/null; then
|
|
echo "Kubelet is unhealthy!"
|
|
curl http://127.0.0.1:10255/healthz
|
|
pkill kubelet
|
|
# Wait for a while, as we don't want to kill it again before it is really up.
|
|
sleep 60
|
|
else
|
|
sleep "${SLEEP_SECONDS}"
|
|
fi
|
|
done
|
|
}
|
|
|
|
|
|
############## Main Function ################
|
|
if [[ "$#" -ne 1 ]]; then
|
|
echo "Usage: health-monitor.sh <docker/kubelet>"
|
|
exit 1
|
|
fi
|
|
|
|
KUBE_ENV="/home/kubernetes/kube-env"
|
|
if [[ ! -e "${KUBE_ENV}" ]]; then
|
|
echo "The ${KUBE_ENV} file does not exist!! Terminate health monitoring"
|
|
exit 1
|
|
fi
|
|
|
|
SLEEP_SECONDS=10
|
|
component=$1
|
|
echo "Start kubernetes health monitoring for ${component}"
|
|
source "${KUBE_ENV}"
|
|
if [[ "${component}" == "docker" ]]; then
|
|
docker_monitoring
|
|
elif [[ "${component}" == "kubelet" ]]; then
|
|
kubelet_monitoring
|
|
else
|
|
echo "Health monitoring for component "${component}" is not supported!"
|
|
fi
|