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181 lines
6.8 KiB
Bash
Executable File
181 lines
6.8 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2014 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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# Validates that the cluster is healthy.
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# Error codes are:
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# 0 - success
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# 1 - fatal (cluster is unlikely to work)
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# 2 - non-fatal (encountered some errors, but cluster should be working correctly)
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set -o errexit
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set -o nounset
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set -o pipefail
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KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
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if [ -f "${KUBE_ROOT}/cluster/env.sh" ]; then
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source "${KUBE_ROOT}/cluster/env.sh"
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fi
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source "${KUBE_ROOT}/hack/lib/util.sh"
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source "${KUBE_ROOT}/cluster/kube-util.sh"
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# Run kubectl and retry upon failure.
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function kubectl_retry() {
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tries=3
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while ! "${KUBE_ROOT}/cluster/kubectl.sh" "$@"; do
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tries=$((tries-1))
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if [[ ${tries} -le 0 ]]; then
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echo "('kubectl $@' failed, giving up)" >&2
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return 1
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fi
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echo "(kubectl failed, will retry ${tries} times)" >&2
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sleep 1
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done
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}
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ALLOWED_NOTREADY_NODES="${ALLOWED_NOTREADY_NODES:-0}"
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CLUSTER_READY_ADDITIONAL_TIME_SECONDS="${CLUSTER_READY_ADDITIONAL_TIME_SECONDS:-30}"
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EXPECTED_NUM_NODES="${NUM_NODES}"
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if [[ "${KUBERNETES_PROVIDER:-}" == "gce" ]]; then
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echo "Validating gce cluster, MULTIZONE=${MULTIZONE:-}"
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# In multizone mode we need to add instances for all nodes in the region.
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if [[ "${MULTIZONE:-}" == "true" ]]; then
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EXPECTED_NUM_NODES=$(gcloud -q compute instances list --project="${PROJECT}" --format=[no-heading] \
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--filter="name ~ '${NODE_INSTANCE_PREFIX}.*' AND zone:($(gcloud -q compute zones list --project="${PROJECT}" --filter=region=${REGION} --format=csv[no-heading]\(name\) | tr "\n" "," | sed "s/,$//"))" | wc -l)
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echo "Computing number of nodes, NODE_INSTANCE_PREFIX=${NODE_INSTANCE_PREFIX}, REGION=${REGION}, EXPECTED_NUM_NODES=${EXPECTED_NUM_NODES}"
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fi
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fi
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if [[ "${REGISTER_MASTER_KUBELET:-}" == "true" ]]; then
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if [[ "${KUBERNETES_PROVIDER:-}" == "gce" ]]; then
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NUM_MASTERS=$(get-master-replicas-count)
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else
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NUM_MASTERS=1
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fi
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EXPECTED_NUM_NODES=$((EXPECTED_NUM_NODES+NUM_MASTERS))
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fi
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REQUIRED_NUM_NODES=$((EXPECTED_NUM_NODES - ALLOWED_NOTREADY_NODES))
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# Make several attempts to deal with slow cluster birth.
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return_value=0
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attempt=0
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# Set the timeout to ~25minutes (100 x 15 second) to avoid timeouts for 1000-node clusters.
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PAUSE_BETWEEN_ITERATIONS_SECONDS=15
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MAX_ATTEMPTS=100
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ADDITIONAL_ITERATIONS=$(((CLUSTER_READY_ADDITIONAL_TIME_SECONDS + PAUSE_BETWEEN_ITERATIONS_SECONDS - 1)/PAUSE_BETWEEN_ITERATIONS_SECONDS))
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while true; do
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# Pause between iterations of this large outer loop.
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if [[ ${attempt} -gt 0 ]]; then
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sleep 15
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fi
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attempt=$((attempt+1))
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# The "kubectl get nodes -o template" exports node information.
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#
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# Echo the output and gather 2 counts:
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# - Total number of nodes.
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# - Number of "ready" nodes.
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#
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# Suppress errors from kubectl output because during cluster bootstrapping
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# for clusters where the master node is registered, the apiserver will become
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# available and then get restarted as the kubelet configures the docker bridge.
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#
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# We are assigning the result of kubectl_retry get nodes operation to the res
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# variable in that way, to prevent stopping the whole script on an error.
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node=$(kubectl_retry get nodes) && res="$?" || res="$?"
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if [ "${res}" -ne "0" ]; then
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if [[ "${attempt}" -gt "${last_run:-$MAX_ATTEMPTS}" ]]; then
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echo -e "${color_red} Failed to get nodes.${color_norm}"
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exit 1
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else
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continue
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fi
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fi
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found=$(($(echo "${node}" | wc -l) - 1))
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ready=$(($(echo "${node}" | grep -v "NotReady" | wc -l ) - 1))
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if (( "${found}" == "${EXPECTED_NUM_NODES}" )) && (( "${ready}" == "${EXPECTED_NUM_NODES}")); then
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break
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elif (( "${found}" > "${EXPECTED_NUM_NODES}" )); then
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if [[ "${KUBE_USE_EXISTING_MASTER:-}" != "true" ]]; then
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echo -e "${color_red}Found ${found} nodes, but expected ${EXPECTED_NUM_NODES}. Your cluster may not behave correctly.${color_norm}"
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fi
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break
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elif (( "${ready}" > "${EXPECTED_NUM_NODES}")); then
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echo -e "${color_red}Found ${ready} ready nodes, but expected ${EXPECTED_NUM_NODES}. Your cluster may not behave correctly.${color_norm}"
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break
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else
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if [[ "${REQUIRED_NUM_NODES}" -le "${ready}" ]]; then
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echo -e "${color_green}Found ${REQUIRED_NUM_NODES} Nodes, allowing additional ${ADDITIONAL_ITERATIONS} iterations for other Nodes to join.${color_norm}"
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last_run="${last_run:-$((attempt + ADDITIONAL_ITERATIONS - 1))}"
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fi
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if [[ "${attempt}" -gt "${last_run:-$MAX_ATTEMPTS}" ]]; then
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echo -e "${color_yellow}Detected ${ready} ready nodes, found ${found} nodes out of expected ${EXPECTED_NUM_NODES}. Your cluster may not be fully functional.${color_norm}"
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kubectl_retry get nodes
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if [[ "${REQUIRED_NUM_NODES}" -gt "${ready}" ]]; then
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exit 1
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else
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return_value=2
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break
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fi
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else
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echo -e "${color_yellow}Waiting for ${EXPECTED_NUM_NODES} ready nodes. ${ready} ready nodes, ${found} registered. Retrying.${color_norm}"
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fi
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fi
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done
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echo "Found ${found} node(s)."
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kubectl_retry get nodes
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attempt=0
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while true; do
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# The "kubectl componentstatuses -o template" exports components health information.
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#
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# Echo the output and gather 2 counts:
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# - Total number of componentstatuses.
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# - Number of "healthy" components.
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cs_status=$(kubectl_retry get componentstatuses -o template --template='{{range .items}}{{with index .conditions 0}}{{.type}}:{{.status}}{{end}}{{"\n"}}{{end}}') || true
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componentstatuses=$(echo "${cs_status}" | grep -c 'Healthy:') || true
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healthy=$(echo "${cs_status}" | grep -c 'Healthy:True') || true
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if ((componentstatuses > healthy)) || ((componentstatuses == 0)); then
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if ((attempt < 5)); then
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echo -e "${color_yellow}Cluster not working yet.${color_norm}"
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attempt=$((attempt+1))
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sleep 30
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else
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echo -e " ${color_yellow}Validate output:${color_norm}"
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kubectl_retry get cs
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echo -e "${color_red}Validation returned one or more failed components. Cluster is probably broken.${color_norm}"
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exit 1
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fi
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else
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break
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fi
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done
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echo "Validate output:"
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kubectl_retry get cs || true
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if [ "${return_value}" == "0" ]; then
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echo -e "${color_green}Cluster validation succeeded${color_norm}"
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else
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echo -e "${color_yellow}Cluster validation encountered some problems, but cluster should be in working order${color_norm}"
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fi
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exit "${return_value}"
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