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2022.4
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Guía de instalación de Automation Suite
Last updated 12 de jul. de 2024

La copia de seguridad falló debido al error

Descripción

Durante la copia de seguridad, los volúmenes de Longhorn se respaldan tomando la instantánea del volumen y enviándola a una ubicación remota. Si los problemas de creación de instantáneas afectan al volumen Longhorn, con el recuento de instantáneas para el volumen siendo superior a 248, la copia de seguridad no se realizará correctamente.

Puedes verificar si la copia de seguridad falló debido al error TooManySnapshots de las siguientes maneras:
  • Comprobando los registros de Velero:

    kubectl logs  -n velero -l app.kubernetes.io/name=velero -c velero |grep "Waiting for volumesnapshotcontents" kubectl logs  -n velero -l app.kubernetes.io/name=velero -c velero |grep "Waiting for volumesnapshotcontents"

    Salida de ejemplo:

    time="2023-12-15T08:15:59Z" level=info msg="Waiting for volumesnapshotcontents snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef to have snapshot handle. Retrying in 5s" backup=velero/daily-2 cmd=/plugins/velero-plugin-for-csi logSource="/go/src/velero-plugin-for-csi/internal/util/util.go:182" pluginName=velero-plugin-for-csi
    time="2023-12-15T08:15:59Z" level=info msg="Waiting for volumesnapshotcontents snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef to have snapshot handle. Retrying in 5s" backup=velero/daily-2 cmd=/plugins/velero-plugin-for-csi logSource="/go/src/velero-plugin-for-csi/internal/util/util.go:182" pluginName=velero-plugin-for-csitime="2023-12-15T08:15:59Z" level=info msg="Waiting for volumesnapshotcontents snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef to have snapshot handle. Retrying in 5s" backup=velero/daily-2 cmd=/plugins/velero-plugin-for-csi logSource="/go/src/velero-plugin-for-csi/internal/util/util.go:182" pluginName=velero-plugin-for-csi
    time="2023-12-15T08:15:59Z" level=info msg="Waiting for volumesnapshotcontents snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef to have snapshot handle. Retrying in 5s" backup=velero/daily-2 cmd=/plugins/velero-plugin-for-csi logSource="/go/src/velero-plugin-for-csi/internal/util/util.go:182" pluginName=velero-plugin-for-csi
  • Comprobando los registros del pod Longhorn:

    kubectl logs  -n longhorn-system -l app=csi-snapshotter --tail=-1 |grep "too many snapshots created"kubectl logs  -n longhorn-system -l app=csi-snapshotter --tail=-1 |grep "too many snapshots created"

    Salida de ejemplo:

    I1215 08:39:41.707351       1 snapshot_controller.go:291] createSnapshotWrapper: CreateSnapshot for content snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef returned error: rpc error: code = Internal desc = Bad response statusCode [500]. Status [500 Internal Server Error]. Body: [code=Server Error, detail=, message=failed to create snapshot: proxyServer=10.42.7.56:8501 destination=10.42.7.56:10004: failed to snapshot volume: rpc error: code = Unknown desc = failed to create snapshot snapshot-f073b88e-bd01-40a8-a645-ec929e276cef for volume 10.42.7.56:10004: rpc error: code = Unknown desc = too many snapshots created] from [http://longhorn-backend:9500/v1/volumes/pvc-7d89efa4-3d60-4837-a632-f190cd3cd9ed?action=snapshotCreate]I1215 08:39:41.707351       1 snapshot_controller.go:291] createSnapshotWrapper: CreateSnapshot for content snapcontent-f073b88e-bd01-40a8-a645-ec929e276cef returned error: rpc error: code = Internal desc = Bad response statusCode [500]. Status [500 Internal Server Error]. Body: [code=Server Error, detail=, message=failed to create snapshot: proxyServer=10.42.7.56:8501 destination=10.42.7.56:10004: failed to snapshot volume: rpc error: code = Unknown desc = failed to create snapshot snapshot-f073b88e-bd01-40a8-a645-ec929e276cef for volume 10.42.7.56:10004: rpc error: code = Unknown desc = too many snapshots created] from [http://longhorn-backend:9500/v1/volumes/pvc-7d89efa4-3d60-4837-a632-f190cd3cd9ed?action=snapshotCreate]

Solución

Si te encuentras con el error TooManySnapshots, debes limpiar las instantáneas para todos los volúmenes ejecutando el siguiente script. Para obtener más información sobre cómo automatizar esta operación, consulta Cómo limpiar automáticamente las instantáneas de Longhorn.
#!/bin/bash
set -e

# longhorn backend URL
url=
# By default, snapshot older than 10 days will be deleted
days=10

function display_usage() {
	echo "usage: $(basename "$0") [-h] -u longhorn-url -d days"
	echo "  -u	Longhorn URL"
	echo "  -d 	Number of days(should be >0). By default, script will delete snapshot older than 10 days."
	echo "  -h	Print help"
}

while getopts 'hd:u:' flag "$@"; do
	case "${flag}" in
		u)
			url=${OPTARG}
			;;
		d)
			days=${OPTARG}
			[ "$days" ] && [ -z "${days//[0-9]}" ] || { echo "Invalid number of days=$days"; exit 1; }
			;;
		h)
			display_usage
			exit 0
			;;
		:)
			echo "Invalid option: ${OPTARG} requires an argument."
			exit 1
			;;
		*)
			echo "Unexpected option ${flag}"
			exit 1
			;;
	esac
done

[[ -z "$url" ]] && echo "Missing longhorn URL" && exit 1

# check if URL is valid
curl -s --connect-timeout 30 ${url}/v1 >> /dev/null || { echo "Unable to connect to longhorn backend"; exit 1; }

echo "Deleting snapshots older than $days days"

# Fetch list of longhorn volumes
vols=$( (curl -s -X GET ${url}/v1/volumes |jq -r '.data[].name') )

#delete given snapshot for given volume
function delete_snapshot() {
	local vol=$1
	local snap=$2

	[[ -z "$vol" || -z "$snap" ]] && echo "Error: delete_snapshot: Empty argument" && return 1
	curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotDelete -d '{"name": "'$snap'"}'
	echo "Snapshot=$snap deleted for volume=$vol"
}

#perform cleanup for given volume
function cleanup_volume() {
	local vol=$1
	local deleted_snap=0

	[[ -z "$vol" ]] && echo "Error: cleanup_volume: Empty argument" && return 1

	# fetch list of snapshot
	snaps=$( (curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotList | jq  -r '.data[] | select(.usercreated==true) | .name' ) )
	for i in ${snaps[@]}; do
		if [[ $i == "volume-head" ]]; then
			continue
		fi

		# calculate date difference for snapshot
		snapTime=$(curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotGet -d '{"name":"'$i'"}' |jq -r '.created')
		currentTime=$(date "+%s")
		timeDiff=$(($currentTime - ($(date -d $snapTime "+%s")) / 86400))
		if [[ $timeDiff -lt $days ]]; then
			echo "Ignoring snapshot $i, since it is older than $timeDiff days"
			continue
		fi

		#trigger deletion for snapshot
		delete_snapshot $vol $i
		deleted_snap=$((deleted_snap+1))
	done

	if [[ "$deleted_snap" -gt 0 ]]; then
		#trigger purge for volume
		curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotPurge >> /dev/null
	fi

}

for i in ${vols[@]}; do
	cleanup_volume $i
done#!/bin/bash
set -e

# longhorn backend URL
url=
# By default, snapshot older than 10 days will be deleted
days=10

function display_usage() {
	echo "usage: $(basename "$0") [-h] -u longhorn-url -d days"
	echo "  -u	Longhorn URL"
	echo "  -d 	Number of days(should be >0). By default, script will delete snapshot older than 10 days."
	echo "  -h	Print help"
}

while getopts 'hd:u:' flag "$@"; do
	case "${flag}" in
		u)
			url=${OPTARG}
			;;
		d)
			days=${OPTARG}
			[ "$days" ] && [ -z "${days//[0-9]}" ] || { echo "Invalid number of days=$days"; exit 1; }
			;;
		h)
			display_usage
			exit 0
			;;
		:)
			echo "Invalid option: ${OPTARG} requires an argument."
			exit 1
			;;
		*)
			echo "Unexpected option ${flag}"
			exit 1
			;;
	esac
done

[[ -z "$url" ]] && echo "Missing longhorn URL" && exit 1

# check if URL is valid
curl -s --connect-timeout 30 ${url}/v1 >> /dev/null || { echo "Unable to connect to longhorn backend"; exit 1; }

echo "Deleting snapshots older than $days days"

# Fetch list of longhorn volumes
vols=$( (curl -s -X GET ${url}/v1/volumes |jq -r '.data[].name') )

#delete given snapshot for given volume
function delete_snapshot() {
	local vol=$1
	local snap=$2

	[[ -z "$vol" || -z "$snap" ]] && echo "Error: delete_snapshot: Empty argument" && return 1
	curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotDelete -d '{"name": "'$snap'"}'
	echo "Snapshot=$snap deleted for volume=$vol"
}

#perform cleanup for given volume
function cleanup_volume() {
	local vol=$1
	local deleted_snap=0

	[[ -z "$vol" ]] && echo "Error: cleanup_volume: Empty argument" && return 1

	# fetch list of snapshot
	snaps=$( (curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotList | jq  -r '.data[] | select(.usercreated==true) | .name' ) )
	for i in ${snaps[@]}; do
		if [[ $i == "volume-head" ]]; then
			continue
		fi

		# calculate date difference for snapshot
		snapTime=$(curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotGet -d '{"name":"'$i'"}' |jq -r '.created')
		currentTime=$(date "+%s")
		timeDiff=$(($currentTime - ($(date -d $snapTime "+%s")) / 86400))
		if [[ $timeDiff -lt $days ]]; then
			echo "Ignoring snapshot $i, since it is older than $timeDiff days"
			continue
		fi

		#trigger deletion for snapshot
		delete_snapshot $vol $i
		deleted_snap=$((deleted_snap+1))
	done

	if [[ "$deleted_snap" -gt 0 ]]; then
		#trigger purge for volume
		curl -s -X POST ${url}/v1/volumes/${vol}?action=snapshotPurge >> /dev/null
	fi

}

for i in ${vols[@]}; do
	cleanup_volume $i
done

Al ejecutar el script mencionado anteriormente, debes pasar los siguientes argumentos:

  • -u: la URL del backend de Longhorn. Para obtener la URL del backend de Longhorn, ejecuta el siguiente comando:
    kubectl get svc -n longhorn-system longhorn-backend -o json | jq -r '.spec | (.clusterIP|tostring) + ":" + (.ports[0].port|tostring)' to fetch URLkubectl get svc -n longhorn-system longhorn-backend -o json | jq -r '.spec | (.clusterIP|tostring) + ":" + (.ports[0].port|tostring)' to fetch URL
  • -d: el número de días antes de que se eliminen las instantáneas.
Nota:
Para obtener una lista de volúmenes afectados por el error TooManySnapshots, ejecuta el siguiente comando:
kubectl get volumes -n longhorn-system -o json | jq -r '.items[] | select(([ .status.conditions[] | select(.type == "toomanysnapshots" and .status == "True") ] | length ) == 1 ) | .metadata.name'kubectl get volumes -n longhorn-system -o json | jq -r '.items[] | select(([ .status.conditions[] | select(.type == "toomanysnapshots" and .status == "True") ] | length ) == 1 ) | .metadata.name'
  • Descripción
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