check-health
============

EDB Postgres分散クラスターの状態を確認します。

概要
^^^^

すべてのノードがアクセス可能であり、すべてのレプリケーションスロットが動作しているかどうかなど、さまざまなチェックを実行します。

このコマンドの実行中にクラスターが高負荷になっている場合、または多数のノードが含まれている場合、クロックスキューの現在の実装は不正確なスキュー値を返す場合があることに注意してください。

.. code:: sh

   pgd check-health [flags]

例
^^

.. code:: text


     Example 1 (3 node cluster, bdr-a1 and bdr-c1 are up, bdr-b1 is down)

     $ pgd check-health

     Check      Status   Message
     -----      ------   -------
     ClockSkew  Critical Clockskew cannot be determined for at least 1 BDR node pair
     Connection Critical The node bdr-b1 is not accessible
     Raft       Warning  There is at least 1 node that is not accessible
     Replslots  Critical There is at least 1 BDR replication slot which is inactive
     Version    Warning  There is at least 1 node that is not accessible

     Example 2 (3 node cluster, all nodes are up but system clocks are not in sync)

     $ pgd check-health

     Check      Status  Message
     -----      ------  -------
     ClockSkew  Warning At least 1 BDR node pair has clockskew greater than 2 seconds
     Connection Ok      All BDR nodes are accessible
     Raft       Ok      Raft Consensus is working correctly
     Replslots  Ok      All BDR replication slots are working correctly
     Version    Ok      All nodes are running same BDR versions

     Example 3 (3 node cluster, all nodes are up and all checks are Ok)

     $ pgd check-health

     Check      Status Message
     -----      ------ -------
     ClockSkew  Ok     All BDR node pairs have clockskew within permissible limit
     Connection Ok     All BDR nodes are accessible
     Raft       Ok     Raft Consensus is working correctly
     Replslots  Ok     All BDR replication slots are working correctly
     Version    Ok     All nodes are running same BDR versions

オプション
^^^^^^^^^^

.. code:: text

     -h, --help   help for check-health

親コマンドから継承したオプション
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. code:: text

     -f, --config-file string   config file; ignored if 
                                --dsn flag is present (default "/etc/edb/pgd-cli/pgd-cli-config.yml")
         --dsn string           database connection string
                                e.g."host=bdr-a1 port=5432 dbname=bdrdb user=postgres "
     -L, --log-level string     logging level: debug, info, warn, error (default "error")
     -o, --output string        output format: json, yaml