3.0 config: update replication tutorials (#3862)

Author: andreyaksenov

doc/code_snippets/snippets/replication/README.md

@@ -0,0 +1,11 @@
+# Master-replica: automated failover
+
+A sample application demonstrating how to bootstrap a replica set with [automated failover](https://www.tarantool.io/en/doc/latest/how-to/replication/repl_bootstrap_auto/).
+
+## Running
+
+To start all instances, execute the following command in the [replication](../../../replication) directory:
+
+```console
+$ tt start auto_leader
+```

doc/code_snippets/snippets/replication/instances.enabled/auto_leader/README.md

@@ -0,0 +1,11 @@
+# Master-replica: manual failover
+
+A sample application demonstrating how to bootstrap a replica set with [manual failover](https://www.tarantool.io/en/doc/latest/how-to/replication/repl_bootstrap/).
+
+## Running
+
+To start all instances, execute the following command in the [replication](../../../replication) directory:
+
+```console
+$ tt start manual_leader
+```

doc/code_snippets/snippets/replication/instances.enabled/manual_leader/README.md

@@ -8,16 +8,6 @@ function create_space()
     box.space.bands:create_index('primary', { parts = { 'id' } })
 end
 
-function create_sync_space()
-    box.schema.space.create('bands', { is_sync = true })
-    box.space.bands:format({
-        { name = 'id', type = 'unsigned' },
-        { name = 'band_name', type = 'string' },
-        { name = 'year', type = 'unsigned' }
-    })
-    box.space.bands:create_index('primary', { parts = { 'id' } })
-end
-
 function load_data()
     box.space.bands:insert { 1, 'Roxette', 1986 }
     box.space.bands:insert { 2, 'Scorpions', 1965 }

doc/code_snippets/snippets/replication/instances.enabled/manual_leader/myapp.lua

@@ -0,0 +1,11 @@
+# Master-master
+
+A sample application demonstrating how to bootstrap a [master-master](https://www.tarantool.io/en/doc/latest/how-to/replication/repl_bootstrap_master_master/) replica set.
+
+## Running
+
+To start all instances, execute the following command in the [replication](../../../replication) directory:
+
+```console
+$ tt start master_master
+```

doc/code_snippets/snippets/replication/instances.enabled/master_master/README.md

@@ -25,4 +25,8 @@ groups:
             database:
               mode: rw
             iproto:
-              listen: 127.0.0.1:3302
+              listen: 127.0.0.1:3302
+
+# Load sample data
+app:
+  file: 'myapp.lua'

doc/code_snippets/snippets/replication/instances.enabled/master_master/config.yaml

@@ -0,0 +1,22 @@
+function create_space()
+    box.schema.space.create('bands')
+    box.space.bands:format({
+        { name = 'id', type = 'unsigned' },
+        { name = 'band_name', type = 'string' },
+        { name = 'year', type = 'unsigned' }
+    })
+    box.space.bands:create_index('primary', { parts = { 'id' } })
+end
+
+function load_data()
+    box.space.bands:insert { 1, 'Roxette', 1986 }
+    box.space.bands:insert { 2, 'Scorpions', 1965 }
+    box.space.bands:insert { 3, 'Ace of Base', 1987 }
+    box.space.bands:insert { 4, 'The Beatles', 1960 }
+    box.space.bands:insert { 5, 'Pink Floyd', 1965 }
+    box.space.bands:insert { 6, 'The Rolling Stones', 1962 }
+    box.space.bands:insert { 7, 'The Doors', 1965 }
+    box.space.bands:insert { 8, 'Nirvana', 1987 }
+    box.space.bands:insert { 9, 'Led Zeppelin', 1968 }
+    box.space.bands:insert { 10, 'Queen', 1970 }
+end

doc/code_snippets/snippets/replication/instances.enabled/master_master/myapp.lua

@@ -10,7 +10,7 @@ Replication allows multiple Tarantool instances to work on copies of the same
 databases. The databases are kept in sync because each instance can communicate
 its changes to all the other instances.
 
-This chapter includes the following sections:
+This section includes the following topics:
 
 ..  toctree::
     :maxdepth: 2
@@ -20,9 +20,5 @@ This chapter includes the following sections:
     repl_sync
     repl_leader_elect
 
-For practical guides to replication, see the :ref:`How-to section <how-to-replication>`.
-You can learn about :ref:`bootstrapping a replica set <replication-bootstrap>`,
-:ref:`adding instances <replication-add_instances>` to the replica set
-or :ref:`removing them <replication-remove_instances>`,
-:ref:`using synchronous replication <how-to-repl_sync>`
-and :ref:`managing leader elections <how-to-repl_leader_elect>`.
+For practical guides to replication, see :ref:`Replication tutorials <how-to-replication>`.
+You can learn about bootstrapping a replica set, adding instances to the replica set, or removing them.

doc/code_snippets/snippets/sharding/README.md renamed to doc/code_snippets/snippets/sharding/instances.enabled/sharded_cluster/README.md

@@ -47,7 +47,7 @@ The following are specifics of adding different types of information to the WAL:
 *    Data change operations on **replication-local** spaces (:doc:`created </reference/reference_lua/box_schema/space_create>` with ``is_local = true``) are written to the WAL but are not replicated.
 
 
-To learn how to enable replication, check the :ref:`Bootstrapping a replica set <replication-setup>` guide.
+To learn how to enable replication, check the :ref:`Bootstrapping a replica set <replication-bootstrap>` guide.
 
 
 .. _replication_stages: