Add encrypted off-cluster etcd backups
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@@ -0,0 +1,36 @@
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apiVersion: v1
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kind: PersistentVolume
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metadata:
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name: naviya-etcd-backups-offsite
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spec:
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capacity:
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storage: 10Gi
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accessModes:
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- ReadWriteMany
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persistentVolumeReclaimPolicy: Retain
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storageClassName: ""
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mountOptions:
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- hard
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- nfsvers=4.2
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- timeo=600
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- retrans=2
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- nosuid
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- nodev
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- noexec
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nfs:
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server: 172.16.2.252
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path: /Volume1/Backup/naviya-kubernetes/etcd
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: naviya-etcd-backups-offsite
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namespace: kube-system
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spec:
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accessModes:
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- ReadWriteMany
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storageClassName: ""
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volumeName: naviya-etcd-backups-offsite
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resources:
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requests:
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storage: 10Gi
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@@ -0,0 +1,285 @@
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apiVersion: batch/v1
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kind: CronJob
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metadata:
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name: naviya-etcd-backup
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namespace: kube-system
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spec:
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schedule: "17 3 * * *"
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timeZone: Etc/UTC
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concurrencyPolicy: Forbid
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startingDeadlineSeconds: 3600
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successfulJobsHistoryLimit: 3
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failedJobsHistoryLimit: 3
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jobTemplate:
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spec:
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backoffLimit: 1
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activeDeadlineSeconds: 1800
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ttlSecondsAfterFinished: 86400
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template:
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metadata:
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labels:
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app.kubernetes.io/name: naviya-etcd-backup
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spec:
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automountServiceAccountToken: false
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hostNetwork: true
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dnsPolicy: ClusterFirstWithHostNet
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restartPolicy: Never
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nodeSelector:
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node-role.kubernetes.io/control-plane: ""
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tolerations:
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- key: node-role.kubernetes.io/control-plane
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operator: Exists
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effect: NoSchedule
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securityContext:
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seccompProfile:
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type: RuntimeDefault
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initContainers:
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- name: snapshot
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image: registry.k8s.io/etcd:3.6.8-0
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imagePullPolicy: IfNotPresent
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command:
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- etcdctl
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args:
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- --endpoints=https://127.0.0.1:2379
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- --cacert=/etcd-certs/ca.crt
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- --cert=/etcd-certs/healthcheck-client.crt
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- --key=/etcd-certs/healthcheck-client.key
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- snapshot
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- save
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- /work/snapshot.db
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securityContext:
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runAsUser: 0
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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volumeMounts:
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- name: etcd-certs
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mountPath: /etcd-certs
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readOnly: true
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- name: work
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mountPath: /work
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- name: validate
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image: registry.k8s.io/etcd:3.6.8-0
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imagePullPolicy: IfNotPresent
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command:
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- etcdutl
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args:
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- --write-out=table
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- snapshot
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- status
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- /work/snapshot.db
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securityContext:
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runAsUser: 0
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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volumeMounts:
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- name: work
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mountPath: /work
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readOnly: true
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containers:
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- name: encrypt
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image: docker.io/alpine/openssl@sha256:61cec9c1f221755bf995f1f309211b222164599e2d1943b666f878ef644d3a0e
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imagePullPolicy: IfNotPresent
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command: ["sh", "-ec"]
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args:
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- |
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umask 077
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stamp="$(date -u +%Y%m%dT%H%M%SZ)"
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name="naviya-etcd-${stamp}-${NODE_NAME}.db.enc"
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target="/offsite/daily/${name}"
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tmp="${target}.tmp.$$"
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checksum="${target}.sha256"
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checksum_tmp="${checksum}.tmp.$$"
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verification="/work/verification.db"
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cleanup() {
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rm -f \
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"$tmp" \
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"$checksum_tmp" \
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"$verification"
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}
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trap cleanup EXIT
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openssl enc \
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-aes-256-cbc \
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-salt \
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-pbkdf2 \
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-iter 600000 \
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-md sha256 \
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-in /work/snapshot.db \
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-out "$tmp" \
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-pass file:/key/passphrase
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test -s "$tmp"
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openssl enc \
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-d \
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-aes-256-cbc \
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-pbkdf2 \
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-iter 600000 \
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-md sha256 \
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-in "$tmp" \
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-out "$verification" \
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-pass file:/key/passphrase
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snapshot_sha="$(sha256sum /work/snapshot.db |
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awk '{print $1}')"
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verification_sha="$(sha256sum "$verification" |
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awk '{print $1}')"
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test "$snapshot_sha" = "$verification_sha"
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rm -f "$verification"
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echo "Chiffrement et déchiffrement de contrôle : OK"
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mv "$tmp" "$target"
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encrypted_sha="$(sha256sum "$target" |
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awk '{print $1}')"
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printf '%s %s\n' \
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"$encrypted_sha" \
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"$name" \
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> "$checksum_tmp"
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mv "$checksum_tmp" "$checksum"
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(
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cd /offsite/daily
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sha256sum -c "$(basename "$checksum")"
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)
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echo "Snapshot etcd quotidien validé : $target"
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copy_tmp=""
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copy_checksum_tmp=""
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cleanup() {
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rm -f \
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"$tmp" \
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"$checksum_tmp" \
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"$verification"
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test -z "$copy_tmp" ||
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rm -f "$copy_tmp"
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test -z "$copy_checksum_tmp" ||
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rm -f "$copy_checksum_tmp"
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}
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copy_archive() {
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tier="$1"
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tier_dir="/offsite/${tier}"
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tier_target="${tier_dir}/${name}"
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copy_tmp="${tier_target}.tmp.$$"
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tier_checksum="${tier_target}.sha256"
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copy_checksum_tmp="${tier_checksum}.tmp.$$"
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cp "$target" "$copy_tmp"
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copy_sha="$(sha256sum "$copy_tmp" |
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awk '{print $1}')"
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test "$copy_sha" = "$encrypted_sha"
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mv "$copy_tmp" "$tier_target"
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printf '%s %s\n' \
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"$encrypted_sha" \
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"$name" \
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> "$copy_checksum_tmp"
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mv \
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"$copy_checksum_tmp" \
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"$tier_checksum"
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(
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cd "$tier_dir"
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sha256sum -c "$(basename "$tier_checksum")"
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)
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copy_tmp=""
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copy_checksum_tmp=""
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echo "Copie ${tier} validée : $tier_target"
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}
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if test "$(date -u +%u)" = "7"; then
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copy_archive weekly
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fi
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if test "$(date -u +%d)" = "01"; then
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copy_archive monthly
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fi
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find /offsite/daily \
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-type f \
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\( -name '*.db.enc' -o -name '*.db.enc.sha256' \) \
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-mtime +14 \
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-delete
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find /offsite/weekly \
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-type f \
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\( -name '*.db.enc' -o -name '*.db.enc.sha256' \) \
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-mtime +56 \
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-delete
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find /offsite/monthly \
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-type f \
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\( -name '*.db.enc' -o -name '*.db.enc.sha256' \) \
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-mtime +370 \
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-delete
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find /offsite \
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-type f \
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-name '*.tmp.*' \
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-mtime +1 \
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-delete
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trap - EXIT
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echo "Sauvegarde etcd chiffrée terminée avec succès"
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env:
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- name: NODE_NAME
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valueFrom:
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fieldRef:
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fieldPath: spec.nodeName
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resources:
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requests:
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cpu: 25m
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memory: 32Mi
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limits:
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cpu: 500m
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memory: 256Mi
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securityContext:
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runAsUser: 0
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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volumeMounts:
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- name: work
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mountPath: /work
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- name: offsite
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mountPath: /offsite
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- name: encryption-key
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mountPath: /key
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readOnly: true
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volumes:
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- name: work
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emptyDir: {}
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- name: etcd-certs
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hostPath:
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path: /etc/kubernetes/pki/etcd
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type: Directory
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- name: offsite
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persistentVolumeClaim:
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claimName: naviya-etcd-backups-offsite
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- name: encryption-key
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secret:
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secretName: naviya-etcd-backup-encryption
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defaultMode: 0400
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@@ -0,0 +1,6 @@
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apiVersion: kustomize.config.k8s.io/v1beta1
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||||
kind: Kustomization
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||||
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||||
resources:
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||||
- 10-storage.yaml
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||||
- 20-cronjob.yaml
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||||
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