[yang] syslog yang model

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -295,6 +295,10 @@
             "23.92.29.245": {},
             "2001:aa:aa::aa": {}
         },
+        "SYSLOG_SERVER" : {
+            "10.13.14.17": {},
+            "20.1.1.1": {}
+        },
         "PORT": {
             "Ethernet0": {
                 "alias": "Eth1/1",

src/sonic-yang-models/tests/yang_model_tests/tests/syslog.json

@@ -0,0 +1,15 @@
+{
+    "SYSLOG_SERVER_TEST": {
+        "desc": "LOAD SYSLOG SERVER TABLE WITH ADDRESS WITH IPV4, IPV6 AND HOST NAME AS SYSLOG SERVERS."
+    },
+    "SYSLOG_SERVER_1_NEG_TEST": {
+        "desc": "LOAD SYSLOG SERVER TABLE WITH EMPTY ADDRESS AS SYSLOG SERVER.",
+        "eStrKey": "InvalidValue",
+        "eStr": ["server_address"]
+    },
+    "SYSLOG_SERVER_2_NEG_TEST": {
+        "desc": "LOAD SYSLOG SERVER TABLE WITH INVALID IP ADDRESS AS SYSLOG SERVER.",
+        "eStrKey": "InvalidValue",
+        "eStr": ["server_address"]
+    }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/syslog.json

@@ -0,0 +1,38 @@
+{
+    "SYSLOG_SERVER_TEST": {
+        "sonic-syslog:sonic-syslog": {
+            "sonic-syslog:SYSLOG_SERVER": {
+                "SYSLOG_SERVER_LIST": [
+                    {
+                        "server_address": "10.11.12.13"
+                    },
+                    {
+                        "server_address": "20.1.1.1"
+                    }
+                ]
+            }
+        }
+    },
+    "SYSLOG_SERVER_1_NEG_TEST": {
+        "sonic-syslog:sonic-syslog": {
+            "sonic-syslog:SYSLOG_SERVER": {
+                "SYSLOG_SERVER_LIST": [
+                    {
+                        "server_address": ""
+                    }
+                ]
+            }
+        }
+    },
+    "SYSLOG_SERVER_2_NEG_TEST": {
+        "sonic-syslog:sonic-syslog": {
+            "sonic-syslog:SYSLOG_SERVER": {
+                "SYSLOG_SERVER_LIST": [
+                    {
+                        "server_address": "2001:aa:aa:aa"
+                    }
+                ]
+            }
+        }
+    }
+}

src/sonic-yang-models/yang-models/sonic-syslog.yang

@@ -0,0 +1,33 @@
+module sonic-syslog {
+
+    yang-version 1.1;
+
+    namespace "http://github.com/Azure/sonic-system-syslog";
+    prefix syslog;
+
+    import ietf-inet-types {
+        prefix inet;
+    }
+
+    container sonic-syslog {
+
+        container SYSLOG_SERVER {
+
+            description "SYSLOG SERVER part of config_db.json";
+
+            list SYSLOG_SERVER_LIST {
+                max-elements 10;
+                description
+                    "Number of upstream SYSLOG servers, limiting to 10";
+
+                key "server_address";
+
+                leaf server_address {
+                    description "syslog server ip address";
+                    type inet:host;
+                }
+            } /* end of list SYSLOG_SERVER_LIST */ 
+
+        } /* end of container SYSLOG_SERVER */
+    }
+}