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etcd on tmpfs
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| ETCD_LISTEN_CLIENT_URLS=https://0.0.0.0:2379 | |
| ETCD_ADVERTISE_CLIENT_URLS=https://<replace-with-your-own> | |
| ETCD_CERT_FILE=<replace-with-your-own> | |
| ETCD_KEY_FILE=<replace-with-your-own> | |
| ETCD_CA_FILE=<replace-with-your-own> |
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| #!/bin/bash | |
| do_snapshot() { | |
| sleep 10 | |
| env | |
| while true | |
| do | |
| (set -x; etcdctl --endpoints="$ETCD_ADVERTISE_CLIENT_URLS" --cacert="$ETCD_CA_FILE" --cert="$ETCD_CERT_FILE" --key="$ETCD_KEY_FILE" snapshot save "$HELPER_SNAPSHOT_DIR"/$(date +%s).db) | |
| (cd "$HELPER_BACKUP_DIR" && ls -tp | grep -v '/$' | tail -n +100 | xargs -d '\n' rm -- {}) | |
| sleep 60; | |
| done | |
| } | |
| do_backup() { | |
| epoch=$(stat --printf='%Y' /var/lib/etcd/current/member/snap/db) | |
| (set -x; cp /var/lib/etcd/current/member/snap/db "$HELPER_BACKUP_DIR"/"$epoch".db) | |
| } | |
| do_restore() { | |
| if [[ $(find "$HELPER_SNAPSHOT_DIR" -name '*.db' -print | wc -l) == "0" ]]; then | |
| echo "no snapshot exists, quit" | |
| exit 0 | |
| # TODO: init ? | |
| fi | |
| if [[ -e ${ETCD_DATA_DIR}/member/snap ]]; then | |
| echo "file exists, skip restore from snapshot" | |
| exit 0 | |
| fi | |
| latest=$(find "$HELPER_SNAPSHOT_DIR" -name '*.db' -print0 | xargs -r -0 ls -1 -t | head -1) | |
| (set -x; etcdutl snapshot restore "$latest" --data-dir "$ETCD_DATA_DIR" --skip-hash-check) | |
| } | |
| case $1 in | |
| start) | |
| do_snapshot & | |
| exec etcd | |
| ;; | |
| restore) | |
| do_restore | |
| ;; | |
| backup) | |
| do_backup | |
| ;; | |
| *) | |
| echo "Usage: $0 {snapshot|restore|backup}" | |
| exit 1 | |
| ;; | |
| esac; |
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| [Unit] | |
| Description=etcd key-value store | |
| Documentation=https://github.com/etcd-io/etcd | |
| After=network-online.target local-fs.target remote-fs.target time-sync.target | |
| Wants=network-online.target local-fs.target remote-fs.target time-sync.target | |
| RequiresMountsFor=/var/lib/etcd/current/ | |
| ConditionPathIsMountPoint=/var/lib/etcd/current/ | |
| [Service] | |
| User=root | |
| Type=notify | |
| Environment=ETCD_DATA_DIR=/var/lib/etcd/current/ | |
| Environment=ETCD_NAME=%m | |
| Environment=HELPER_SNAPSHOT_DIR=/var/lib/etcd/snapshots/ | |
| EnvironmentFile=/etc/default/etcd | |
| ExecStartPre=/usr/local/bin/etcd-helper.sh restore | |
| ExecStart=/usr/local/bin/etcd-helper.sh start | |
| ExecStopPost=/usr/local/bin/etcd-helper.sh backup | |
| Restart=always | |
| RestartSec=10s | |
| LimitNOFILE=40000 | |
| [Install] | |
| WantedBy=multi-user.target |
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