3.0 config: replication reference

doc/code_snippets/README.md

@@ -1,25 +1,43 @@
 # Tarantool code examples
 
-The `doc/code_snippets` folder of a Tarantool documentation repository contains runnable code examples that show how to work with various Tarantool modules. Code from these examples is [referenced](#referencing-code-snippets) in corresponding documentation sections. 
+The `doc/code_snippets` folder of a Tarantool documentation repository contains runnable code examples that show how to work with Tarantool:
+
+- The [snippets](snippets) folder contains sample applications that demonstrate how to configure a Tarantool cluster.
+- The [test](test) folder contains testable Lua examples that show how to work with various Tarantool modules.
+
+Code from these examples is [referenced](#referencing-code-snippets) in corresponding documentation sections. 
 
 ## Prerequisites
 
-First, install the [tt CLI utility](https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/).
-Then, go to the `doc/code_snippets` folder and install the following libraries:
+- Install the [tt CLI utility](https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/).
+- To be able to run tests for samples from [test](test), go to the `doc/code_snippets` folder and install the following libraries:
 
-- Install [luatest](https://github.com/tarantool/luatest):
-    ```shell
-    tt rocks install luatest
-    ```
+    - [luatest](https://github.com/tarantool/luatest):
+        ```shell
+        tt rocks install luatest
+        ```
+
+    - [luarapidxml](https://github.com/tarantool/luarapidxml):
+        ```shell
+        tt rocks install luarapidxml
+        ```
 
-- Install [luarapidxml](https://github.com/tarantool/luarapidxml):
-    ```shell
-    tt rocks install luarapidxml
-    ```
 
 
+## Running
+
+### Running applications from 'snippets'
+
+To run applications placed in [snippets](snippets), follow these steps:
+
+1.  Go to the directory containing samples for a specific feature, for example, [snippets/replication](snippets/replication).
+2. To run applications placed in [instances.enabled](instances.enabled), execute the `tt start` command, for example:
+
+    ```console
+    $ tt start auto_leader
+    ```
 
-## Running and testing examples
+### Running and testing examples from 'test'
 
 To test all the examples, go to the `doc/code_snippets` folder and execute the `luatest` command:
 

doc/code_snippets/snippets/config/tt.yaml

@@ -1,63 +1,54 @@
-tt:
-  modules:
-    # Directory where the external modules are stored.
-    directory: "modules"
+modules:
+  # Directory where the external modules are stored.
+  directory: modules
 
-  app:
-    # Directory that stores various instance runtime
-    # artifacts like console socket, PID file, etc.
-    run_dir: "var/run"
+env:
+  # Restart instance on failure.
+  restart_on_failure: false
 
-    # Directory that stores log files.
-    log_dir: var/log
+  # Directory that stores binary files.
+  bin_dir: bin
 
-    # The maximum size in MB of the log file before it gets rotated.
-    log_maxsize: 100
+  # Directory that stores Tarantool header files.
+  inc_dir: include
 
-    # The maximum number of days to retain old log files.
-    log_maxage: 8
+  # Path to directory that stores all applications.
+  # The directory can also contain symbolic links to applications.
+  instances_enabled: instances.enabled
 
-    # The maximum number of old log files to retain.
-    log_maxbackups: 10
+  # Tarantoolctl artifacts layout compatibility: if set to true tt will not create application
+  # sub-directories for control socket, pid files, log files, etc.. Data files (wal, vinyl,
+  # snap) and multi-instance applications are not affected by this option.
+  tarantoolctl_layout: false
 
-    # Restart instance on failure.
-    restart_on_failure: false
+app:
+  # Directory that stores various instance runtime
+  # artifacts like console socket, PID file, etc.
+  run_dir: var/run
 
-    # Directory where write-ahead log (.xlog) files are stored.
-    wal_dir: "var/lib"
+  # Directory that stores log files.
+  log_dir: var/log
 
-    # Directory where memtx stores snapshot (.snap) files.
-    memtx_dir: "var/lib"
+  # Directory where write-ahead log (.xlog) files are stored.
+  wal_dir: var/lib
 
-    # Directory where vinyl files or subdirectories will be stored.
-    vinyl_dir: "var/lib"
+  # Directory where memtx stores snapshot (.snap) files.
+  memtx_dir: var/lib
 
-    # Directory that stores binary files.
-    bin_dir: "bin"
+  # Directory where vinyl files or subdirectories will be stored.
+  vinyl_dir: var/lib
 
-    # Directory that stores Tarantool header files.
-    inc_dir: "include"
+# Path to file with credentials for downloading Tarantool Enterprise Edition.
+# credential_path: /path/to/file
+ee:
+  credential_path:
 
-    # Path to directory that stores all applications.
-    # The directory can also contain symbolic links to applications.
-    instances_enabled: "instances.enabled"
+templates:
+  # The path to templates search directory.
+  - path: templates
 
-    # Tarantoolctl artifacts layout compatibility: if set to true tt will not create application
-    # sub-directories for control socket, pid files, log files, etc.. Data files (wal, vinyl,
-    # snap) and multi-instance applications are not affected by this option.
-    tarantoolctl_layout: false
-
-  # Path to file with credentials for downloading Tarantool Enterprise Edition.
-  # credential_path: /path/to/file
-  ee:
-    credential_path: ""
-
-  templates:
-    # The path to templates search directory.
-    - path: "templates"
-
-  repo:
-    # Directory where local rocks files could be found.
-    rocks: ""
-    # Directory that stores installation files.
-    distfiles: "distfiles"
+repo:
+  # Directory where local rocks files could be found.
+  rocks:
+  # Directory that stores installation files.
+  distfiles: distfiles

doc/code_snippets/snippets/replication/README.md

@@ -0,0 +1,11 @@
+# Replication
+
+A sample application demonstrating various replication features.
+
+## Running
+
+To run applications placed in [instances.enabled](instances.enabled), go to the `replication` directory in the terminal and execute the `tt start` command, for example:
+
+```console
+$ tt start auto_leader
+```

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

@@ -0,0 +1,30 @@
+credentials:
+  users:
+    replicator:
+      password: 'topsecret'
+      roles: [replication]
+
+iproto:
+  advertise:
+    peer: replicator@
+
+replication:
+  failover: election
+
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        replication:
+          bootstrap_strategy: config
+        bootstrap_leader: instance001
+        instances:
+          instance001:
+            iproto:
+              listen: 127.0.0.1:3301
+          instance002:
+            iproto:
+              listen: 127.0.0.1:3302
+          instance003:
+            iproto:
+              listen: 127.0.0.1:3303

doc/code_snippets/snippets/replication/instances.enabled/bootstrap_strategy/instances.yml

@@ -0,0 +1,3 @@
+instance001:
+instance002:
+instance003:

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

@@ -3,9 +3,6 @@ credentials:
     replicator:
       password: 'topsecret'
       roles: [replication]
-    client:
-      password: 'secret'
-      roles: [super]
 
 iproto:
   advertise:

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

@@ -0,0 +1,27 @@
+credentials:
+  users:
+    replicator:
+      password: 'topsecret'
+      roles: [replication]
+
+replication:
+  peers:
+    - replicator:topsecret@127.0.0.1:3301
+    - replicator:topsecret@127.0.0.1:3302
+    - replicator:topsecret@127.0.0.1:3303
+  failover: election
+
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            iproto:
+              listen: 127.0.0.1:3301
+          instance002:
+            iproto:
+              listen: 127.0.0.1:3302
+          instance003:
+            iproto:
+              listen: 127.0.0.1:3303

doc/code_snippets/snippets/replication/instances.enabled/peers/instances.yml

@@ -0,0 +1,3 @@
+instance001:
+instance002:
+instance003:

doc/code_snippets/snippets/replication/tt.yaml

@@ -1,63 +1,54 @@
-tt:
-  modules:
-    # Directory where the external modules are stored.
-    directory: "modules"
+modules:
+  # Directory where the external modules are stored.
+  directory: modules
 
-  app:
-    # Directory that stores various instance runtime
-    # artifacts like console socket, PID file, etc.
-    run_dir: "var/run"
+env:
+  # Restart instance on failure.
+  restart_on_failure: false
 
-    # Directory that stores log files.
-    log_dir: var/log
+  # Directory that stores binary files.
+  bin_dir: bin
 
-    # The maximum size in MB of the log file before it gets rotated.
-    log_maxsize: 100
+  # Directory that stores Tarantool header files.
+  inc_dir: include
 
-    # The maximum number of days to retain old log files.
-    log_maxage: 8
+  # Path to directory that stores all applications.
+  # The directory can also contain symbolic links to applications.
+  instances_enabled: instances.enabled
 
-    # The maximum number of old log files to retain.
-    log_maxbackups: 10
+  # Tarantoolctl artifacts layout compatibility: if set to true tt will not create application
+  # sub-directories for control socket, pid files, log files, etc.. Data files (wal, vinyl,
+  # snap) and multi-instance applications are not affected by this option.
+  tarantoolctl_layout: false
 
-    # Restart instance on failure.
-    restart_on_failure: false
+app:
+  # Directory that stores various instance runtime
+  # artifacts like console socket, PID file, etc.
+  run_dir: var/run
 
-    # Directory where write-ahead log (.xlog) files are stored.
-    wal_dir: "var/lib"
+  # Directory that stores log files.
+  log_dir: var/log
 
-    # Directory where memtx stores snapshot (.snap) files.
-    memtx_dir: "var/lib"
+  # Directory where write-ahead log (.xlog) files are stored.
+  wal_dir: var/lib
 
-    # Directory where vinyl files or subdirectories will be stored.
-    vinyl_dir: "var/lib"
+  # Directory where memtx stores snapshot (.snap) files.
+  memtx_dir: var/lib
 
-    # Directory that stores binary files.
-    bin_dir: "bin"
+  # Directory where vinyl files or subdirectories will be stored.
+  vinyl_dir: var/lib
 
-    # Directory that stores Tarantool header files.
-    inc_dir: "include"
+# Path to file with credentials for downloading Tarantool Enterprise Edition.
+# credential_path: /path/to/file
+ee:
+  credential_path:
 
-    # Path to directory that stores all applications.
-    # The directory can also contain symbolic links to applications.
-    instances_enabled: "instances.enabled"
+templates:
+  # The path to templates search directory.
+  - path: templates
 
-    # Tarantoolctl artifacts layout compatibility: if set to true tt will not create application
-    # sub-directories for control socket, pid files, log files, etc.. Data files (wal, vinyl,
-    # snap) and multi-instance applications are not affected by this option.
-    tarantoolctl_layout: false
-
-  # Path to file with credentials for downloading Tarantool Enterprise Edition.
-  # credential_path: /path/to/file
-  ee:
-    credential_path: ""
-
-  templates:
-    # The path to templates search directory.
-    - path: "templates"
-
-  repo:
-    # Directory where local rocks files could be found.
-    rocks: ""
-    # Directory that stores installation files.
-    distfiles: "distfiles"
+repo:
+  # Directory where local rocks files could be found.
+  rocks:
+  # Directory that stores installation files.
+  distfiles: distfiles