snapshot
===============================


elasticsearch集群中要使用snapshot备份数据的快照，需要用到共享存储。
假设有3个节点，那么三个节点要挂在相同的共享存储，并且mount点要一样。

.. code-block:: bash
    :linenos:

    sudo mkdir share2lxc
    sudo chmod -R 777 share2lxc/
    lxc config device add elasticsearch-cluster-node-1 mydisk disk source=/vm/share2lxc path=/mnt/data
    lxc config device add elasticsearch-cluster-node-2 mydisk disk source=/vm/share2lxc path=/mnt/data
    lxc config device add elasticsearch-cluster-node-3 mydisk disk source=/vm/share2lxc path=/mnt/data

.. code-block:: bash

    # 创建snapshot仓库
    curl -X PUT "http://10.196.126.18:9200/_snapshot/my_backup" -H 'Content-Type: application/json' -d'
    {
        "type": "fs",
        "settings": {
            "location": "/mnt/data/es-snapshot-repo",
            "compress": true
        }
    }
    '
    
    # 查看集群中注册了那些仓库
    curl http://10.196.126.38:9200/_snapshot

    # 删除snapshot仓库
    curl -X DELETE "http://10.196.126.18:9200/_snapshot/my_backup"

    # 查看有那些snapshot
    curl "HTTP://10.196.126.193:9200/_snapshot/my_backup/_all?pretty"
    {
        "snapshots": [
            {
                "snapshot": "snapshot_1",
                "uuid": "wU3WpvnnR9SOpShRMsnQww",
                "version_id": 6040399,
                "version": "6.4.3", # 版本
                "indices": [ # 索引列表
                    "knowledgeindex",
                    "onequestionindex",
                    "trainmanualindex",
                    "knowattachindex"
                ],
                "include_global_state": true,
                "state": "SUCCESS",
                "start_time": "2024-12-13T16:34:25.287Z",
                "start_time_in_millis": 1734107665287,
                "end_time": "2024-12-13T16:34:34.473Z",
                "end_time_in_millis": 1734107674473,
                "duration_in_millis": 9186,
                "failures": [],
                "shards": {
                    "total": 20,
                    "failed": 0,
                    "successful": 20
                }
            }
        ]
    }

    # 恢复快照
    curl -X POST "10.196.126.193:9200/_snapshot/my_backup/snapshot_1/_restore?pretty"

    # 查看索引是否恢复进去了
    curl http://10.196.126.38:9200/_cat/indices?v&pretty
    health status index            uuid                   pri rep docs.count docs.deleted store.size pri.store.size
    green  open   onequestionindex 7WYSLyk3TJGrP2QcTHIFYw   5   1        722           99      2.3mb          1.1mb
    green  open   trainmanualindex bxseCPEtTe6QAj2CKnBFfA   5   1       4840          100      4.3mb          2.1mb
    green  open   knowattachindex  HdEpQFkQQdKGsg6iUslZSg   5   1       2787           33      1.8mb        923.1kb
    green  open   knowledgeindex   XbB_kFWbRGG6Kq1kRZI-9g   5   1      53599        19417    440.5mb        220.2mb