check-health

Checks the health of the EDB Postgres Distributed cluster.

Synopsis

Performs various checks such as if all nodes are accessible, all replication slots are working, and CAMO pairs are connected.

Please note that the current implementation of clock skew may return an inaccurate skew value if the cluster is under high load while running this command or has large number of nodes in it.

pgd check-health [flags]

Examples

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

$ pgd check-health

Check      Status   Message
-----      ------   -------
CAMO       Critical At least 1 CAMO partner is not connected
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 no RAFT_LEADER, an election might be in progress
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
-----      ------  -------
CAMO       Ok      All CAMO pairs are connected
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
-----      ------ -------
CAMO       Ok     All CAMO pairs are connected
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

Options

-h, --help   help for check-health

Options inherited from parent commands

-f, --config-file string   config file; ignored if
                           --dsn flag is present (default "/etc/edb/pgd-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