diff --git a/docs/guide/06-switching.en.md b/docs/guide/06-switching.en.md new file mode 100644 index 0000000..a2be9a0 --- /dev/null +++ b/docs/guide/06-switching.en.md @@ -0,0 +1,233 @@ +# Failover + +>In [Quick Start](01-quickstart.en.md) article, we introduced opentenbase architecture, source code compilation and installation, cluster running status, startup and stop, etc. +> +>In [Access](02-access.md) article, we introduced the application program to connect opentenbase for database creation, table creation, data import, query and other operations. +> +>In [Basic Use](03-basic-use.md) article, we introduced the creation of shard table, cold and hot partition table, replication table in opentenbase, and basic DML operations. +> +>In [Advanced Use](04-advanced-use.md) article, we introduced the advanced use of opentenbase, including the use of various window functions, Json/Jsonb, cursors, transactions, locks, etc. +> +>In [组件安装及管理](05-component.md) article, we dive into the internal of various components of opentenbase, and introduced the initialization, parameter configuration, startup and stop, running status viewing, routing effective configuration of various components separately. +> +>In this article, we will introduce in detail how to switch the master and standby roles of various components in opentenbase. + +## Environment Deployment +- Number of servers + + Two servers, IP's are： 172.16.0.29，172.16.0.47 + +- Hardware configuration + + CPU：4 core+ + Memory：8 GB+ + System Disk：50GB+ + Data Disk：200G+ + +- Operation system requirements + + CentOS 7.3 + +## Create OS user +- Create 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 opentenbase application program 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 `pgxz` application program to directory `/data/opentenbase/install/pgxz`, the directory structure 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 the environment variables for user 'pgxz' + +``` +[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} +``` + +## 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 = '' +``` + +## Install and configure GTM + + | Node IP | Directory +-------|:-----------:|------------------------- +gtm master | 172.16.0.29 | /data/opentenbase/data/pgxz/gtm +gtm standby | 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 standby | 172.16.0.47 | /data/opentenbase/data/pgxz/dn01 +dn02 master | 172.16.0.47 | /data/opentenbase/data/pgxz/dn02 +dn02 stangdy | 172.16.0.29 | /data/opentenbase/data/pgxz/dn02 + + +# DN Failover +## Simulate DN01 master failure + +``` +[opentenbase@VM_0_29_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 stop -m f +``` + +## Switch DN01 standby to master + +``` +[opentenbase@VM_0_47_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 promote +``` + +## Switch main route of CN01 + +``` +[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); +``` + +## Switch main route of CN02 + +``` +[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); +``` + +## Switch main route of DN01 + +``` +[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); +``` + +**Notice that here we need connect to new route** + +## Switch main route of DN02 + +``` +[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); +``` +说明：CN的主备切换和DN类似，只是在模拟CN故障和提升备节点时将-Z参数改为coordinator，因此不在赘述 +pg_ctl -Z coordinator -D ${CN节点数据目录} [stop -m f | promote] + +# GTM Failover +## Simulate GTM master failure + +``` +[opentenbase@VM_0_29_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm stop +``` + +## Promote GTM standby to master + +``` +[opentenbase@VM_0_47_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm promote +``` + +## Switch main route of CN01 + +``` +[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); +``` + +## Switch main route of CN02 + +``` +[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); +``` + +## Switch main route of DN01 + +``` +[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); +``` + +**Notice that here we need connect to new route** +## Switch main route of DN02 + +``` +[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); +```