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Ubuntu installation and configuration PostgreSQL (18.04)

2022-06-26 13:20:00 【Lanterns can only come to the classroom to experience life】

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Write it at the front

The use of Ubuntu edition ：18.04

install

install postgresql
```
$ sudo apt-get install postgresql
```
- If it fails, you can update the package
```
sudo apt-get update
```
After successful installation , You can see psql Version of
```
psql --version
```
- If the installation is successful, output
```
psql (PostgreSQL) 9.5.25
```
It can be seen that , there PostgreSQL Version is 9.5
After successful installation ,postgresql Automatically created ： A database user postgres（ No password by default ）、 A data > library postgres、 One Linux user postgres
Revise it Linux user postgres Password
```
sudo passwd postgres
```
Switch to Linux user postgres
```
su postgres
```

Go to the database command line

psql

Output after successful execution

psql (9.5.25)
Type "help" for help.

postgres=#

Postgresql The service of is enabled by default , without , You can use the following command ：

sudo /etc/init.d/postgresql start   #  Opening service 
sudo /etc/init.d/postgresql stop    #  Close the service 
sudo /etc/init.d/postgresql restart #  Restart the service

see Postgresql Database directory of （ Where is the data stored ）
stay psql At the command line of , perform SHOW data_directory;
```
postgres=# SHOW data_directory;
        data_directory
------------------------------
 /var/lib/postgresql/9.5/main
(1 row)
```
/var/lib/postgresql/9.5/main Is the database directory

To configure （ Optional ）

To enable other computers to connect to your PostgreSQL The server

Edit the file
```
sudo vi /etc/postgresql/9.5/main/postgresql.conf
```
/etc/postgresql/9.5/main/postgresql.conf
among 9.5 yes PostgreSQL Version of , It depends on the local version
find *#listen_addresses = 'localhost'*, It is amended as follows
```
listen_addresses = '*'
```
If you want to allow IPv4 and IPv6 Connect , Please put ‘localhost’ Replace with ‘::’
```
listen_addresses = '::'
```

Modify the database directory

Create a database directory （ Where you need it ）
```
mkdir  Directory name 
```
For example, I created
```
mkdir /home/test/pg_db
```
close Postgresql service
```
sudo service postgresql stop
```

Copy the data （ from Default database directory Copied to the The database directory you specified ）

sudo cp -rf  postgresql Default database directory for   The database directory you specified

What I do is

sudo cp -rf /var/lib/postgresql/9.5/main /home/test/pg_db

permissions

sudo chown -R postgres:postgres  The database directory you specified 
sudo chmod 700  The database directory you specified

What I do is

sudo chown -R postgres:postgres /home/test/pg_db
sudo chmod 700 /home/test/pg_db

modify postgresql Of data_directory （ The database directory specified in the configuration file ）
```
sudo vi /etc/postgresql/9.5/main/postgresql.conf
```
take data_directory = '/var/lib/postgresql/9.5/main' # use data in another directory It is amended as follows ：
```
data_directory = ' The database directory you specified '
```
What I do is
```
data_directory = '/home/test/pg_db'
```
start-up Postgresql service
```
sudo service postgresql start
```