title: WAL archive: FAILED (please make sure WAL shipping is setup)
body: <p>I am trying to configure Barman to backup. When I do a <code>barman check replica</code> I keep getting:</p>
  
  <pre><code>Server replica:
  WAL archive: FAILED (please make sure WAL shipping is setup)
  PostgreSQL: OK
  superuser: OK
  wal_level: OK
  directories: OK
  retention policy settings: OK
  backup maximum age: FAILED (interval provided: 1 day, latest backup age: No available backups)
  compression settings: OK
  failed backups: OK (there are 0 failed backups)
  minimum redundancy requirements: FAILED (have 0 backups, expected at least 2)
  ssh: OK (PostgreSQL server)
  not in recovery: FAILED (cannot perform exclusive backup on a standby)
  archive_mode: OK
  archive_command: OK
  continuous archiving: OK
  archiver errors: OK
  </code></pre>
  
  <p>I am using Postgresql 9.6 and barman 2.1; I am not sure as to what the issue is could someone help?
  Here is my Barman server configuration:</p>
  
  <pre><code>description = "Database backup"
  conninfo = host=&lt;db-ip&gt; user=postgres dbname=db
  backup_method = rsync
  ssh_command = ssh postgres@&lt;db-ip&gt;
  archiver = on
  </code></pre>