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+# Active/Standby Switch
+
+>In the [quickstart](01-quickstart.en.md) article, we introduced the architecture of OpenTenBase, source code compilation and installation, cluster running status, start and stop, etc.
+>
+>In [access](02-access.en.md) we introduced the application to connect to the OpenTenBase database for operations such as database creation, table creation, data import, and query.
+>
+>In [basic-use](03-basic-use.en.md) we introduce the creation of unique shard tables, replicated tables, and basic DML operations in OpenTenBase.
+>
+>In [advanced-use](04-advanced-use.md) we introduce the advanced usage operations of OpenTenBase, which includes the use of various window functions, Json/Jsonb, cursors, transactions, locks, etc.
+>
+>In [component](05-component.md), we go deep into the various components of OpenTenBase and provide a detailed introduction to the initialization, parameter configuration, start and stop, running status viewing, routing effective configuration, etc. of various components.
+>
+>In this article, we will introduce in detail how to switch the active and backup roles of various components within OpenTenBase.
+
+## Environment deployment
+- Number of servers
+
+   2 units, the IPs are: 172.16.0.29, 172.16.0.47
+
+- Hardware Configuration
+
+   CPU: 4 cores
+   Memory: 8G
+   System disk: 50G
+   Data disk: 200G
+
+- Operating system requirements
+
+   centos7.3
+
+## Create OS user
+- Create operating system running user
+
+```
+[root@VM_0_29_centos ~]# adduser -d /data/opentenbase opentenbase
+```
+
+- Configure operating system user password
+
+```
+[root@VM_0_29_centos pgxztmp]# passwd opentenbase
+```
+
+- Create the opentenbase application running directory
+
+```
+[root@VM_0_29_centos pgxz]# su opentenbase
+[opentenbase@VM_0_29_centos install]$ mkdir -p /data/opentenbase/install/pgxz
+```
+
+- Create 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. The structure of the directory is
+
+```
+[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 the pgxz user
+
+```
+[opentenbase@VM_0_29_centos ~]$ vim /data/opentenbase/.bashrc
+# .bashrc
+
+# Source global definitions
+if [ -f /etc/bashrc ]; then
+         ./etc/bashrc
+fi
+
+export OPENTENBSE_HOME=/data/opentenbase/install/pgxz
+export PATH=$OPENTENBase_HOME/bin:$PATH
+export LD_LIBRARY_PATH=$OPENTENBASE_HOME/lib:${LD_LIBRARY_PATH}
+```
+
+## Configure 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 structure description
+
+Node Name | IP | Directory
+-------|:-----------:|--------------------------
+gtm master | 172.16.0.29 | /data/opentenbase/data/pgxz/gtm
+gtm preparation | 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
+dn01master | 172.16.0.29 | /data/opentenbase/data/pgxz/dn01
+dn01备172.16.0.47 | /data/opentenbase/data/pgxz/dn01
+dn02master | 172.16.0.47 | /data/opentenbase/data/pgxz/dn02
+dn02备172.16.0.29 | /data/opentenbase/data/pgxz/dn02
+
+
+# DN active/standby switchover
+## Simulate DN01 main fault
+
+```
+[opentenbase@VM_0_29_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 stop -m f
+```
+
+## Promote DN01 backup to master
+
+```
+[opentenbase@VM_0_47_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 promote
+```
+
+## CN01 main route change
+
+```
+[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 main route change
+
+```
+[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 main route change
+
+```
+[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 that you need to connect to the new master here**
+
+## DN02 main route change
+
+```
+[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: CN's active-standby switching is similar to DN, except that the -Z parameter is changed to coordinator when simulating CN failure and promoting the standby node, so I won't go into details.
+pg_ctl -Z coordinator -D ${CN node data directory} [stop -m f | promote]
+
+#GTM active/standby switchover
+## Simulate GTM main fault
+
+```
+[opentenbase@VM_0_29_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm stop
+```
+## Promote GTM backup to primary
+
+```
+[opentenbase@VM_0_47_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm promote
+```
+## CN01 main route change
+
+```
+[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 main route change
+
+```
+[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 main route change
+
+```
+[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 that you need to connect to the new master here**
+## DN02 main route change
+
+```
+
+[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);
+```