Implement configurable replcfg (client-side)

Implements administrator-selectable replication configurations for new
pools in PVC clusters, overriding the default of copies=3,mincopies=2.

client-api/api_lib/pvcapi.py

@@ -870,12 +870,12 @@ def ceph_pool_list(limit=None):
     pvc_common.stopZKConnection(zk_conn)
     return flask.jsonify(retdata), retcode
 
-def ceph_pool_add(name, pgs):
+def ceph_pool_add(name, pgs, replcfg):
     """
     Add a Ceph RBD pool to the PVC Ceph storage cluster.
     """
     zk_conn = pvc_common.startZKConnection(config['coordinators'])
-    retflag, retdata = pvc_ceph.add_pool(zk_conn, name, pgs)
+    retflag, retdata = pvc_ceph.add_pool(zk_conn, name, pgs, replcfg)
     if retflag:
         retcode = 200
     else:

client-api/pvc-api.py

@@ -755,6 +755,13 @@ def api_ceph_pool_root():
             # We default to a very small number; DOCUMENT THIS
             pgs = 128
 
+        # Get replication configuration
+        if 'replcfg' in flask.request.values:
+            replcfg = flask.request.values['replcfg']
+        else:
+            # We default to copies=3,mincopies=2
+            replcfg = 'copies=3,mincopies=2'
+
         return pvcapi.ceph_pool_add(pool, pgs)
 
 @api.route('/api/v1/storage/ceph/pool/<pool>', methods=['GET', 'DELETE'])

client-cli/pvc.py

@@ -1380,13 +1380,22 @@ def ceph_pool():
 @click.argument(
     'pgs'
 )
-def ceph_pool_add(name, pgs):
+@click.option(
+    '--replcfg', 'replcfg',
+    default='copies=3,mincopies=2', show_default=True, required=False,
+    help="""
+    The replication configuration, specifying both a "copies" and "mincopies" value, separated by a
+    comma, e.g. "copies=3,mincopies=2". The "copies" value specifies the total number of replicas and should not exceed the total number of nodes; the "mincopies" value specifies the minimum number of available copies to allow writes. For additional details please see the Cluster Architecture documentation.
+    """
+)
+def ceph_pool_add(name, pgs, replcfg):
     """
     Add a new Ceph RBD pool with name NAME and PGS placement groups.
+
     """
 
     zk_conn = pvc_common.startZKConnection(zk_host)
-    retcode, retmsg = pvc_ceph.add_pool(zk_conn, name, pgs)
+    retcode, retmsg = pvc_ceph.add_pool(zk_conn, name, pgs, replcfg)
     cleanup(retcode, retmsg, zk_conn)
 
 ###############################################################################

client-common/ceph.py

@@ -658,9 +658,9 @@ def getPoolInformation(zk_conn, pool):
     }
     return pool_information
 
-def add_pool(zk_conn, name, pgs):
+def add_pool(zk_conn, name, pgs, replcfg):
     # Tell the cluster to create a new pool
-    add_pool_string = 'pool_add {},{}'.format(name, pgs)
+    add_pool_string = 'pool_add {},{},{}'.format(name, pgs, replcfg)
     zkhandler.writedata(zk_conn, {'/cmd/ceph': add_pool_string})
     # Wait 1/2 second for the cluster to get the message and start working
     time.sleep(0.5)
@@ -670,7 +670,7 @@ def add_pool(zk_conn, name, pgs):
         try:
             result = zkhandler.readdata(zk_conn, '/cmd/ceph').split()[0]
             if result == 'success-pool_add':
-                message = 'Created new RBD pool "{}" with "{}" PGs.'.format(name, pgs)
+                message = 'Created new RBD pool "{}" with "{}" PGs and replication configuration {}.'.format(name, pgs, replcfg)
                 success = True
             else:
                 message = 'ERROR: Failed to create new pool; check node logs for details.'