chore: add README for pitr

Signed-off-by: mlycore <[email protected]>

pitr/README.md

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+# README
+
+## Prerequisition
+
+### Servers
+
+| | Role | Components |
+|:-:|:-:|:-:|
+|1| Pitr cli operation server | Pitr Cli + ShardingSphere Proxy + Zookeeper|
+|2| OpenGauss Server 1 | OpenGauss Server + Pitr Agent |
+|3| OpenGauss Server 2 | OpenGauss Server + Pitr Agent |
+
+### Softwares
+
+- Apache ShardingSphere Proxy can access OpenGauss network 
+- External access to Apache ShardingSphere Proxy
+- External access to OpenGauss Server via port 18080
+- OpenGauss has user `omm` and database `omm` which can be accessed
+- OpenGauss enables `cbm tracking`
+- SSL certs for cli and agent secure communication
+
+
+### ShardingSphere Proxy Configurations
+
+server.yaml
+
+```yaml
+mode:
+  type: Cluster
+  repository:
+    type: ZooKeeper
+    props:
+      namespace: governance
+      server-lists: localhost:2181
+      retryIntervalMilliseconds: 500
+      timeToLiveSeconds: 60
+      maxRetries: 3
+      operationTimeoutMilliseconds: 500
+
+authority:
+  users:
+    - user: root@%
+      password: root
+    - user: sharding
+      password: sharding
+  privilege:
+    type: ALL_PERMITTED
+
+globalClock:
+  enabled: true
+  type: TSO
+  provider: redis
+  props:
+    host: 127.0.0.1
+    port: 6379
+
+transaction:
+  defaultType: XA
+  providerType: Atomikos
+
+props:
+  proxy-frontend-database-protocol-type: openGauss
+
+```
+
+config-sharding.yaml
+```yaml
+databaseName: sharding_db
+dataSources:
+  ds_0:
+    url: jdbc:opengauss://${OPENGAUSS_SERVER_1}:13100/tpccdb?useSSL=false
+    username: root 
+    password: root 
+    connectionTimeoutMilliseconds: 30000
+    idleTimeoutMilliseconds: 60000
+    maxLifetimeMilliseconds: 1800000
+    maxPoolSize: 50
+    minPoolSize: 1
+
+  ds_1:
+    url: jdbc:opengauss://${OPENGAUSS_SERVER_2}:13100/tpccdb?useSSL=false
+    username: root 
+    password: root 
+    connectionTimeoutMilliseconds: 30000
+    idleTimeoutMilliseconds: 60000
+    maxLifetimeMilliseconds: 1800000
+    maxPoolSize: 50
+    minPoolSize: 1
+```
+
+### OpenGauss Configurations
+
+Enable `cbm tracking` in postgres.conf
+
+```shell
+enable_cbm_tracking = on
+```
+
+### SSL Configurations
+
+The communication of Pitr cli and Pitr agent is secured by TLS which needs a SSL key pair. You can choose or generate a new key pair through commands below:
+
+```shell
+cd pitr/agent
+make openssl-local
+```
+
+NOTE: update environment variable `OPENSSL_CONF` if needed.
+
+## Deployment
+
+Pitr cli (aka `gs_pitr`) and Pitr agent (aka `pitr-agent`) binaries could be downloaded at Apache ShardingSphere on Cloud release page, or just compiled in your local development environment.
+
+### Binary
+
+The binaries are packaged as .tar.gz file on [release page](https://github.com/apache/shardingsphere-on-cloud/releases). You can download expected version and uncompress the binary files `gs_pitr` and `pitr-agent`.
+
+### Compile
+
+To compile Pitr cli and agent, you should using a recommanded Golang version 1.20 with Linux 3.10.0-957.el7.x86_64.
+
+1. Firstly clone the project
+
+```shell
+git clone [email protected]:apache/shardingsphere-on-cloud.git
+```
+
+2. Compile Pitr agent
+
+```shell
+cd shardingsphere-on-cloud/pitr/agent
+make build
+```
+
+3. Compile Pitr cli
+
+```shell
+cd shardingsphere-on-cloud/pitr/cli 
+make build
+```
+
+### Deploy Pitr Agent
+
+1. Copy cert files
+
+```shell
+scp tls.crt tls.key root@${OPENGAUSS_SERVER_1}:/home/omm/
+scp tls.crt tls.key root@${OPENGAUSS_SERVER_2:/home/omm/
+```
+
+2. Copy binary and cert files
+
+```shell
+cd shardingsphere-on-cloud/pitr/agent 
+
+scp pitr-agent root@${OPENGAUSS_SERVER_1}:/home/omm/
+scp pitr-agent root@${OPENGAUSS_SERVER_2}:/home/omm/
+```
+
+### Start Pitr Agent
+
+1. Login OpenGauss server and change directory to `/home/omm`
+
+Here are files under `/home/omm`:
+
+```shell
+$ ll
+total 13M
+drwx------  4 omm  omm    32 Mar  2 14:22 data
+drwx------ 29 omm  omm  4.0K May 23 11:37 pgdata
+-rwxr-xr-x  1 root root  13M May 16 18:25 pitr-agent
+-rwxr-xr-x  1 root root 1.1K May 16 18:26 tls.crt
+-rwxr-xr-x  1 root root 1.7K May 16 18:26 tls.key
+```
+
+2. Start Pitr agent
+
+```shell
+./pitr-agent -pgdata /data/data-glt/d1 -port 18080 -tls-crt tls.crt -tls-key tls.key -log-level debug
+```
+
+Parameters:
+- pgdata: OpenGauss data storage path
+- port: Pitr agent exposed port 
+- tls-crt: TLS crt file path
+- tls-key: TLS key file path
+- log-level: Pitr agent log level
+
+## Test
+
+### Prepare Test Data
+
+You can connect to ShardingSphere Proxy with `gsql` and generate some data for testing.
+```shell
+gsql -h127.0.0.1 -p3307 -Usharding -Wsharding -d sharding_db
+```
+1. Check Storage Units
+
+```SQL
+SHOW STORAGE UNITS
+```
+
+2. Create Sharding Table Rule `t_user`
+
+```SQL
+CREATE SHARDING TABLE RULE t_user(
+ STORAGE_UNITS(ds_0,ds_1),
+ SHARDING_COLUMN=user_id,
+ TYPE(NAME="hash_mod",PROPERTIES("sharding-count"="4"))
+);	
+```
+
+3. Check Sharding Table Rule
+
+```SQL
+SHOW SHARDING TABLE RULE t_user;
+```
+
+4. Create Table `t_user` 
+```SQL
+CREATE TABLE t_user (
+  user_id INT NOT NULL, 
+  order_id INT NOT NULL, 
+  status VARCHAR(45) NULL, 
+  PRIMARY KEY (user_id)
+);
+```
+
+5. Check Sharding Table Nodes:
+```SQL
+SHOW SHARDING TABLE NODES;
+```
+
+6. Insert test data
+```SQL
+insert into t_user( user_id, order_id, status) values(1,1,1);
+insert into t_user( user_id, order_id, status) values(2,2,2);
+insert into t_user( user_id, order_id, status) values(3,3,3);
+insert into t_user( user_id, order_id, status) values(4,4,4);
+
+select * from t_user;
+```
+
+### Test Case 
+
+#### Backup
+
+```Shell
+./gs_pitr backup --host ${OPENGAUSS_SERVER_1} --password sharding --port 3307 --username sharding --agent-port 18080 --dn-threads-num 1 --dn-backup-path "/home/omm/data" -b FULL
+```
+
+Parameters:
+- host: ShardingSphere Proxy server
+- port: ShardingSphere Proxy port
+- username: ShardingSphere Proxy user
+- password: ShardingSphere Proxy password
+- agent-port: Pitr agent port
+- dn-threads-num: OpenGauss concurrent backup
+- dn-threads-path: OpenGauss backup files path
+- b: Backup mode
+
+Check backups and get the backup id for recovery.
+
+```Shell
+./gs_pitr show
+```
+
+#### Recovery
+
+You may need to delete some records of `t_user` first.
+```SQL
+delete from t_user where user_id=1;
+delete from t_user where user_id=2;
+```
+
+Do recovery:
+```Shell
+./gs_pitr restore --host ${OPENGAUSS_SERVER_1} --password sharding --port 3307 --username sharding --agent-port 18080 --dn-backup-path "/home/omm/data" --id ${BACKUP_ID} 
+```
+
+Parameters:
+- host: ShardingSphere Proxy server
+- port: ShardingSphere Proxy port
+- username: ShardingSphere Proxy user
+- password: ShardingSphere Proxy password
+- agent-port: Pitr agent port
+- dn-backup-path: OpenGauss backup files path
+- id: Backup id 
+
+Verify data: 
+```SQL
+select * from t_user;
+```
+
+