95 lines
2.6 KiB
Bash
Executable File
95 lines
2.6 KiB
Bash
Executable File
#! /usr/bin/env bash
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# enable unofficial bash strict mode
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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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IFS=$'\n\t'
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# make script trace visible via `kubectl logs`
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set -o xtrace
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ALL_DB_SIZE_QUERY="select sum(pg_database_size(datname)::numeric) from pg_database;"
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PG_BIN=$PG_DIR/$PG_VERSION/bin
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DUMP_SIZE_COEFF=5
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TOKEN=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
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K8S_API_URL=https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_SERVICE_PORT/api/v1
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CERT=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
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function estimate_size {
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"$PG_BIN"/psql -tqAc "${ALL_DB_SIZE_QUERY}"
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}
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function dump {
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# settings are taken from the environment
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"$PG_BIN"/pg_dumpall
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}
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function compress {
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pigz
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}
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function aws_upload {
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declare -r EXPECTED_SIZE="$1"
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# mimic bucket setup from Spilo
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# to keep logical backups at the same path as WAL
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# NB: $LOGICAL_BACKUP_S3_BUCKET_SCOPE_SUFFIX already contains the leading "/" when set by the Postgres operator
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PATH_TO_BACKUP=s3://$LOGICAL_BACKUP_S3_BUCKET"/spilo/"$SCOPE$LOGICAL_BACKUP_S3_BUCKET_SCOPE_SUFFIX"/logical_backups/"$(date +%s).sql.gz
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if [ -z "$EXPECTED_SIZE" ]; then
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aws s3 cp - "$PATH_TO_BACKUP" --debug --sse="AES256"
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else
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aws s3 cp - "$PATH_TO_BACKUP" --debug --expected-size "$EXPECTED_SIZE" --sse="AES256"
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fi;
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}
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function get_pods {
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declare -r SELECTOR="$1"
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curl "${K8S_API_URL}/pods?$SELECTOR" \
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--cacert $CERT \
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-H "Authorization: Bearer ${TOKEN}" | jq .items[].status.podIP -r
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}
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function get_current_pod {
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curl "${K8S_API_URL}/pods?fieldSelector=metadata.name%3D${HOSTNAME}" \
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--cacert $CERT \
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-H "Authorization: Bearer ${TOKEN}"
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}
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declare -a search_strategy=(
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list_all_replica_pods_current_node
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list_all_replica_pods_any_node
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get_master_pod
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)
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function list_all_replica_pods_current_node {
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get_pods "labelSelector=version%3D${SCOPE},spilo-role%3Dreplica&fieldSelector=spec.nodeName%3D${CURRENT_NODENAME}" | head -n 1
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}
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function list_all_replica_pods_any_node {
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get_pods "labelSelector=version%3D${SCOPE},spilo-role%3Dreplica" | head -n 1
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}
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function get_master_pod {
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get_pods "labelSelector=version%3D${SCOPE},spilo-role%3Dmaster" | head -n 1
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}
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CURRENT_NODENAME=$(get_current_pod | jq .items[].spec.nodeName --raw-output)
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export CURRENT_NODENAME
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for search in "${search_strategy[@]}"; do
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PGHOST=$(eval "$search")
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export PGHOST
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if [ -n "$PGHOST" ]; then
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break
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fi
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done
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dump | compress | aws_upload $(($(estimate_size) / DUMP_SIZE_COEFF))
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