【我与openGauss的故事系列】奇思妙想

[root@node1 ~]# wget https://golang.google.cn/dl/go1.19.1.linux-amd64.tar.gz

[root@node1 ~]# tar -zxvf go1.19.1.linux-amd64.tar.gz -C /usr/local

export PATH=$PATH:/usr/local/go/bin

package main

import fmt

func main(){

fmt.Println("hello,world！")

}

[root@node1 ~]# go run test.go
hello,world！

[root@node1 ~]# cat gaussdb.go
package main

import (
  "fmt"
  "io/ioutil"
  "os/exec"
)

func main() {
  cmd := exec.Command("/bin/bash", "-c", `useradd omm ;echo "Enmo@123" | passwd --stdin omm > /dev/null ;mkdir -p /opt/mogdb/software;chown -R omm:omm /opt/;tar -xf  openGauss-3.1.0-CentOS-64bit.tar.bz2 -C /opt/mogdb/software; su - omm -c "echo 'export GAUSSHOME=/opt/mogdb/software'  >> /home/omm/.bashrc ;echo 'export PATH=\$GAUSSHOME/bin:\$PATH' >> /home/omm/.bashrc ;echo 'export LD_LIBRARY_PATH=\$GAUSSHOME/lib:\$LD_LIBRARY_PATH' >> /home/omm/.bashrc;source /home/omm/.bashrc;gs_initdb --pgdata=/opt/mogdb/data --nodename=primary --pwpasswd=Enmo@123 --encoding=UTF-8 --locale=en_US.UTF-8 > /dev/null ;echo \"port=26000\" >> /opt/mogdb/data/postgresql.conf;echo \"listen_addresses = '0.0.0.0'\" >> /opt/mogdb/data/postgresql.conf;echo \"password_encryption_type = 0\" >> /opt/mogdb/data/postgresql.conf;echo \"log_directory = 'pg_log'\" >> /opt/mogdb/data/postgresql.conf;echo \"remote_read_mode=non_authentication\" >> /opt/mogdb/data/postgresql.conf;echo \"host all all 0.0.0.0/0 md5\" >> /opt/mogdb/data/pg_hba.conf;gs_ctl start -D /opt/mogdb/data > /dev/null ;gsql -d postgres -p 26000 -c'select version();select pg_postmaster_start_time();';echo -e 'data_user is omm ! \ndata_port is 26000 ! \ndata_path is /opt/mogdb/data ! \ndata_soft is /opt/mogdb/software !'"`)
//  cmd := exec.Command("/bin/bash", "-c", `df -h;ls`)
  //创建获取命令输出管道
  stdout, err := cmd.StdoutPipe()
  if err != nil {
    fmt.Printf("Error:can not obtain stdout pipe for command:%s\n", err)
    return
  }

  //执行命令
  if err := cmd.Start(); err != nil {
    fmt.Println("Error:The command is err,", err)
    return
  }

  //读取所有输出
  bytes, err := ioutil.ReadAll(stdout)
  if err != nil {
    fmt.Println("ReadAll Stdout:", err.Error())
    return
  }

  if err := cmd.Wait(); err != nil {
    fmt.Println("wait:", err.Error())
    return
  }
  fmt.Printf("stdout:\n\n %s", bytes)
}

[root@node1 ~]# ls openGauss-3.1.0-CentOS-64bit.tar.bz2 gaussdb.go
gaussdb.go  openGauss-3.1.0-CentOS-64bit.tar.bz2

[root@node1 ~]# go run gaussdb.go
stdout:

                                                                        version
------------------------------------------------------------------------------------------------------------------------------------------------------
 (openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr   on x86_64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)

   pg_postmaster_start_time
-------------------------------
 2022-09-28 13:38:28.550462+08
(1 row)

data_user is omm !
data_port is 26000 !
data_path is /opt/mogdb/data !
data_soft is /opt/mogdb/software !

[root@node1 ~]# su - omm
Last login: Wed Sep 28 13:39:38 CST 2022
[omm@node1 ~]$ gsql -d postgres -p26000 -r
gsql ((openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

openGauss=# select version();
                                                                       version
------------------------------------------------------------------------------------------------------------------------------------------------------
 (openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr   on x86_64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)

openGauss=# \q
[omm@node1 ~]$ logout

[root@node1 ~]# go build gaussdb.go
[root@node1 ~]# ls gaussdb openGauss-3.1.0-CentOS-64bit.tar.bz2 gaussdb.go
gaussdb  gaussdb.go  openGauss-3.1.0-CentOS-64bit.tar.bz2

[root@node1 ~]# cat a.sh
pkill -9 gaussdb
rm -rf /opt/mogdb/*
userdel -r omm
[root@node1 ~]# sh a.sh

[root@node1 ~]# date;./gaussdb;date
Wed Sep 28 13:53:12 CST 2022
stdout:

                                                                        version
------------------------------------------------------------------------------------------------------------------------------------------------------
 (openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr   on x86_64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)

   pg_postmaster_start_time
-------------------------------
 2022-09-28 13:53:27.034021+08
(1 row)

data_user is omm !
data_port is 26000 !
data_path is /opt/mogdb/data !
data_soft is /opt/mogdb/software !
Wed Sep 28 13:53:27 CST 2022

[root@node1 ~]# su - omm
Last login: Wed Sep 28 13:53:19 CST 2022
[omm@node1 ~]$ gsql -d postgres -p26000 -r
gsql ((openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

openGauss=# select version();
                                                                       version
------------------------------------------------------------------------------------------------------------------------------------------------------
 (openGauss 3.1.0 build 2c0ccaf9) compiled at 2022-09-25 19:32:58 commit 0 last mr   on x86_64-unknown-linux-gnu, compiled by g++ (GCC) 7.3.0, 64-bit
(1 row)

openGauss=# \q