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standby switchover: add hint for diagnosing remote DB connection failure

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Output a command, which when excuted on the local node (promotion
candidate) will attempt to remotely connect to the demotion candidate
and display both the connection message encountered and the connection
parameters used.

This is useful for corner-cases where the connection normally succeeds if a
particular environment variable (e.g. PGPORT) is normally set, but is
not set in the environment where SSH is executed.
This commit is contained in:
Ian Barwick
2020-04-17 11:20:02 +09:00
parent 45e96f21a5
commit 97d83bd443
3 changed files with 49 additions and 16 deletions
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21
repmgr-action-standby.c
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@@ -4064,10 +4064,31 @@ do_standby_switchover(void)
if (remote_error == REMOTE_ERROR_DB_CONNECTION)
{
PQExpBufferData ssh_command;
/* can happen if the connection configuration is not consistent across nodes */
log_detail(_("an error was encountered when attempting to connect to PostgreSQL on node \"%s\" (ID: %i)"),
remote_node_record.node_name,
remote_node_record.node_id);
/* output a helpful hint to help diagnose the issue */
initPQExpBuffer(&remote_command_str);
make_remote_repmgr_path(&remote_command_str, &remote_node_record);
appendPQExpBufferStr(&remote_command_str, "node check --db-connection");
initPQExpBuffer(&ssh_command);
make_remote_command(remote_host,
runtime_options.remote_user,
remote_command_str.data,
config_file_options.ssh_options,
&ssh_command);
log_hint(_("diagnose with:\n %s"), ssh_command.data);
termPQExpBuffer(&remote_command_str);
termPQExpBuffer(&ssh_command);
}
else if (remote_error == REMOTE_ERROR_CONNINFO_PARSE)
{