OpenTenBase · yousoa · Feb 27, 2024
diff --git a/docs/guide/06-switching.en.md b/docs/guide/06-switching.en.md
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+# Master and Slave switching
+
+>In [Quick Start](01-quickstart.md), we introduce the architecture of OpenTenBase, source code compilation and installation, cluster running status, startup and stop, etc.
+>
+>In [Application Access](02-access.md), we describe how applications can connect to OpenTenBase databases for database creation, table creation, data import, and query.
+>
+>In [Basic Usage](03-basic-use.md), we introduce the creation of shard tables, hot and cold partition tables, and replication tables in OpenTenBase, as well as basic DML operations.
+>
+>In [Advanced Usage](04-advanced-use.md), we introduce the advanced usage of OpenTenBase, which includes the use of various window functions, Json/Jsonb, cursors, transactions, locks, etc.
+>
+>IN [Component Installation and Management](05-component.md), We delve into the various components of OpenTenBase and give a detailed introduction to the initialization, parameter configuration, start and stop, running status viewing, and route effective configuration of each component.
+>
+>In this article, we will introduce in detail how to switch the primary/standby roles of various components within OpenTenBase.
+
+## Environment deployment  
+- Number of servers
+
+  2 units, IP respectively： 172.16.0.29，172.16.0.47
+
+- Hardware configuration
+
+  CPU：4C  
+  Memory：8G  
+  System disk：50G  
+  Data disk：200G  
+
+- Operating system requirements
+
+  centos7.3  
+
+## Creating OS Users
+
+-	Create an operating system running user  
+
+```
+[root@VM_0_29_centos ~]# adduser -d /data/opentenbase opentenbase
+```
+
+-	Configure the operating system user password  
+
+```
+[root@VM_0_29_centos pgxztmp]# passwd opentenbase
+```
+
+-	Create a directory for the OpenTenbase application to run  
+
+```
+[root@VM_0_29_centos pgxz]# su opentenbase  
+[opentenbase@VM_0_29_centos install]$ mkdir -p /data/opentenbase/install/pgxz
+```
+
+-	Create an OpenTenbase data directory  
+
+```
+[root@VM_0_29_centos pgxz]# su opentenbase  
+[opentenbase@VM_0_29_centos install]$ mkdir -p /data/opentenbase/data/pgxz
+```
+
+-	Upload the pgxz application to the directory /data/opentenbase/install/pgxz, and the structure of the directory is as follows:  
+
+```
+[opentenbase@VM_0_29_centos pgxz]$ ll /data/opentenbase/install/pgxz
+total 4
+drwxrwxr-x 2 pgxz pgxz 4096 Nov 10 04:33 bin
+drwxrwxr-x 4 pgxz pgxz  189 Nov 10 04:33 include
+drwxrwxr-x 4 pgxz pgxz  172 Nov 10 04:33 lib
+drwxrwxr-x 3 pgxz pgxz   24 Oct  1 14:54 share
+[opentenbase@VM_0_29_centos pgxz]$ 
+```
+
+- Configure environment variables for PGXZ users
+
+```
+[opentenbase@VM_0_29_centos ~]$ vim /data/opentenbase/.bashrc 
+# .bashrc
+
+# Source global definitions
+if [ -f /etc/bashrc ]; then
+        . /etc/bashrc
+fi
+
+export OPENTENBASE_HOME=/data/opentenbase/install/pgxz
+export PATH=$OPENTENBASE_HOME/bin:$PATH
+export LD_LIBRARY_PATH=$OPENTENBASE_HOME/lib:${LD_LIBRARY_PATH}
+```
+
+## Configuring public parameters
+
+```
+[opentenbase@VM_0_29_centos ~]# mkdir -p /data/opentenbase/global/
+[opentenbase@VM_0_29_centos ~]#vim /data/opentenbase/global/postgresql.conf.user
+
+listen_addresses = '0.0.0.0'
+max_connections = 500
+max_pool_size = 65535
+shared_buffers = 1GB                    
+max_prepared_transactions = 2000
+maintenance_work_mem = 256MB
+wal_level = logical
+max_wal_senders = 64
+max_wal_size = 1GB
+min_wal_size = 256MB
+log_destination = 'csvlog'
+logging_collector = on
+log_directory = 'log'
+log_filename = 'postgresql-%A-%H.log' 
+synchronous_commit = local
+synchronous_standby_names = '' 
+```
+
+## Installation Configuration Topology Description
+
+
+Node Name |     IP	    |  Directory
+-------|:-----------:|-------------------------
+gtm-master  | 172.16.0.29 | /data/opentenbase/data/pgxz/gtm
+gtm-slave	| 172.16.0.47	 | /data/opentenbase/data/pgxz/gtm
+cn01	| 172.16.0.29	 | /data/opentenbase/data/pgxz/cn01
+cn02	| 172.16.0.47	 | /data/opentenbase/data/pgxz/cn02
+dn01-master	| 172.16.0.29	 | /data/opentenbase/data/pgxz/dn01
+dn01-slave	| 172.16.0.47	 | /data/opentenbase/data/pgxz/dn01
+dn02-master	| 172.16.0.47	 | /data/opentenbase/data/pgxz/dn02
+dn02slave	| 172.16.0.29	 | /data/opentenbase/data/pgxz/dn02
+
+
+# DN Master/Slave switchover
+## Similar to DN01 primary fault
+
+```
+[opentenbase@VM_0_29_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 stop -m f  
+```
+
+## Promote DN01 Slave to Master
+
+```
+[opentenbase@VM_0_47_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 promote 
+```
+
+## CN01 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.29 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+## CN02 Primary route changes  
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+## DN01 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23001 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+**Note: This is to be connected to the new master**
+
+## DN02 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23002 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+Note: The Master/Slave switchover of a CN is similar to that of a DN, except that the -Z parameter is changed to coordinator when simulating a CN fault and promoting a standby node  
+pg_ctl -Z coordinator -D ${CN node data directory} [stop -m f | promote]
+
+# GTM Master/Slave switchover
+## Similar to a GTM Master fault
+
+```
+[opentenbase@VM_0_29_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm stop 
+```
+## Promote GTM slave to primary
+
+```
+[opentenbase@VM_0_47_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm promote 
+```
+## CN01 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.29 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+## CN02 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+## DN01 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23001 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+
+**Note: This is to be connected to the new master**
+## DN02 Primary route changes
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23002 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+