Installation on a Single Node

Prerequisites

A user group and a common user have been created.
All the server OSs and networks are functioning properly.
A common user must have the read, write, and execute permissions on the database package decompression path and installation path, and the installation path must be empty.
A common user has the execution permission on the downloaded openGauss package.
Before the installation, check whether the specified openGauss port is occupied. If the port number is occupied, change the port or stop the process that uses the port.

Procedure

Log in to the host where the openGauss package is installed as a common user and decompress the openGauss package to the installation directory.
```
tar -jxf openGauss-Server-x.x.x-openEuler20.03-x86_64.tar.bz2 -C /opt/software/openGauss
```
Assume that the decompressed package is stored in the /opt/software/openGauss directory. Go to the simpleInstall directory.
```
cd /opt/software/openGauss/simpleInstall
```
Run the install.sh script to install openGauss.
```
sh install.sh  -w  "xxxx" &&source ~/.bashrc
```
NOTE:
- -w: initializes the database password (specified by gs_initdb). This parameter is mandatory for security purposes.
- -p: specifies the openGauss port number. If the port number is not specified, the default value 5432 is used.
- -h|--help: displays usage instructions.
- After the installation, the database name is sgnode.
- The installation path of the database directory is /opt/software/openGauss/data/single_node, in which /opt/software/openGauss is the decompression path and data/single_node is the newly created database node directory.
- During execution, if the error “the maximum number of SEMMNI is not correct, the current SEMMNI is xxx. Please check it.” appears, please execute the following command as a user with root privileges.
```
sysctl -w kernel.sem="250 85000 250 330" 
```

After the installation is complete, check whether the process is normal by using ps and gs_ctl.

ps ux | grep gaussdb
gs_ctl query -D /opt/software/openGauss/data/single_node

Run the ps command to display information similar to the following:

omm      24209 11.9  1.0 1852000 355816 pts/0  Sl   01:54   0:33 /opt/software/openGauss/bin/gaussdb -D /opt/software/openGauss/single_node
omm      20377  0.0  0.0 119880  1216 pts/0    S+   15:37   0:00 grep --color=auto gaussdb

Run the gs_ctl command to display information similar to the following:

gs_ctl query ,datadir is /opt/software/openGauss/data/single_node
HA state:
    local_role                     : Normal
    static_connections             : 0
    db_state                       : Normal
    detail_information             : Normal

Senders info:
    No information

 Receiver info:
No information