### 2. Run MinIO in federated mode

Bucket lookup from DNS federation requires two dependencies

- etcd (for bucket DNS service records)
- CoreDNS (for DNS management based on populated bucket DNS service records, optional)

## Architecture

![bucket-lookup](https://github.com/minio/minio/blob/master/docs/federation/lookup/bucket-lookup.png?raw=true)

### Environment variables

    val bit = 1 shl MAX_HEADER_LIST_SIZE
    return if (bit and set != 0) values[MAX_HEADER_LIST_SIZE] else defaultValue
  }

  /**
   * Writes `other` into this. If any setting is populated by this and `other`, the
   * value and flags from `other` will be kept.
   */
  fun merge(other: Settings) {
    for (i in 0 until COUNT) {
      if (!other.isSet(i)) continue
      set(i, other[i])
    }

     *
     * @param handle the domain handle
     * @param access the desired access rights
     * @param rid the relative identifier of the alias
     * @param aliasHandle the alias handle to be populated
     */
    public MsrpcSamrOpenAlias(final SamrDomainHandle handle, final int access, final int rid, final SamrAliasHandle aliasHandle) {
        super(handle, access, rid, aliasHandle);
        this.ptype = 0;

    /**
     * Creates a new request to open an LSA policy handle.
     *
     * @param server the server name to connect to
     * @param access the desired access rights
     * @param policyHandle the policy handle to be populated
     */
    public MsrpcLsarOpenPolicy2(final String server, final int access, final LsaPolicyHandle policyHandle) {
        super(server, new lsarpc.LsarObjectAttributes(), access, policyHandle);

     *
     * @param handle the SAM policy handle
     * @param access the desired access rights
     * @param sid the security identifier of the domain
     * @param domainHandle the domain handle to be populated
     */
    public MsrpcSamrOpenDomain(final SamrPolicyHandle handle, final int access, final rpc.sid_t sid, final SamrDomainHandle domainHandle) {
        super(handle, access, sid, domainHandle);
        ptype = 0;

        assertEquals(0, entries.length);
    }

    @Test
    @DisplayName("getEntries should return SmbShareInfo array for DFS roots")
    void testGetEntries_populatedArray() throws Exception {
        // Create populated DfsEnumArray200
        netdfs.DfsEnumArray200 populatedArray = new netdfs.DfsEnumArray200();
        populatedArray.count = 3;
        populatedArray.s = new netdfs.DfsInfo200[3];

        // Create DFS root entries

        List<Map<String, Object>> emptyList = new ArrayList<>();
        searchRenderData.setDocumentItems(emptyList);
        assertEquals(emptyList, searchRenderData.getDocumentItems());

        // Test with populated list
        List<Map<String, Object>> documentItems = new ArrayList<>();
        Map<String, Object> doc1 = new HashMap<>();
        doc1.put("title", "Test Document 1");
        doc1.put("content", "Test content 1");

           * requireNonNull is safe because we ensure that the first `distinct` elements have been
           * populated.
           */
          return of(requireNonNull(dedupedElements[0]));
        default:
          /*
           * The suppression is safe because we ensure that the first `distinct` elements have been
           * populated.
           */
          @SuppressWarnings("nullness")
          Object[] elements =

      private val source: BufferedSource = source.buffer()

      // Visible for testing.
      @JvmField var dynamicTable = arrayOfNulls<Header>(8)

      // Array is populated back to front, so new entries always have lowest index.
      private var nextHeaderIndex = dynamicTable.size - 1

      @JvmField var headerCount = 0

      @JvmField var dynamicTableByteCount = 0

    /**
     * Creates a new request to open an LSA policy handle.
     *
     * @param server the server name to connect to
     * @param access the desired access rights
     * @param policyHandle the policy handle to be populated
     */
    public MsrpcLsarOpenPolicy2(final String server, final int access, final LsaPolicyHandle policyHandle) {
        super(server, new lsarpc.LsarObjectAttributes(), access, policyHandle);