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@sacreman
Last active Jul 12, 2019
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Backup all K8s config to a timestamped location
#!/bin/bash -e
BACKUP_DIR="/var/tmp/k8sbackup/$(date +%s)"
echo "Backing up cluster to ${BACKUP_DIR}"
NAMESPACES=$(kubectl get ns -o jsonpath={.items[*].metadata.name})
RESOURCETYPES="${RESOURCETYPES:-"ingress deployment configmap secret svc rc ds networkpolicy statefulset cronjob pvc"}"
GLOBALRESOURCES="${GLOBALRESOURCES:-"namespace storageclass clusterrole clusterrolebinding customresourcedefinition"}"
mkdir -p ${BACKUP_DIR}
cd ${BACKUP_DIR}
# Start kubernetes state export
for resource in $GLOBALRESOURCES; do
echo "Exporting resource: ${resource}" >/dev/stderr
kubectl get -o=json "$resource" | jq --sort-keys \
'del(
.items[].metadata.annotations."kubectl.kubernetes.io/last-applied-configuration",
.items[].metadata.annotations."control-plane.alpha.kubernetes.io/leader",
.items[].metadata.uid,
.items[].metadata.selfLink,
.items[].metadata.resourceVersion,
.items[].metadata.creationTimestamp,
.items[].metadata.generation
)' | python -c 'import sys, yaml, json; yaml.safe_dump(json.load(sys.stdin), sys.stdout, default_flow_style=False)' >"${BACKUP_DIR}/${resource}.yaml"
done
for namespace in $NAMESPACES; do
[ -d "${BACKUP_DIR}/${namespace}" ] || mkdir -p "${BACKUP_DIR}/${namespace}"
for type in $RESOURCETYPES; do
echo "[${namespace}] Exporting resources: ${type}" >/dev/stderr
label_selector=""
if [[ "$type" == 'configmap' && -z "${INCLUDE_TILLER_CONFIGMAPS:-}" ]]; then
label_selector="-l OWNER!=TILLER"
fi
kubectl --namespace="${namespace}" get "$type" $label_selector -o custom-columns=SPACE:.metadata.namespace,KIND:..kind,NAME:.metadata.name --no-headers | while read -r a b name; do
[ -z "$name" ] && continue
# Service account tokens cannot be exported
if [[ "$type" == 'secret' && $(kubectl get -n "${namespace}" -o jsonpath="{.type}" secret "$name") == "kubernetes.io/service-account-token" ]]; then
continue
fi
kubectl --namespace="${namespace}" get -o=json "$type" "$name" | jq --sort-keys \
'del(
.metadata.annotations."control-plane.alpha.kubernetes.io/leader",
.metadata.annotations."kubectl.kubernetes.io/last-applied-configuration",
.metadata.creationTimestamp,
.metadata.generation,
.metadata.resourceVersion,
.metadata.selfLink,
.metadata.uid,
.spec.clusterIP,
.status
)' | python -c 'import sys, yaml, json; yaml.safe_dump(json.load(sys.stdin), sys.stdout, default_flow_style=False)' >"${BACKUP_DIR}/${namespace}/${name}.${type}.yaml"
done
done
done
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