Install and deploy postgresql database to build timescaledb database (time series library)

Install and deploy postgresql database to build timescaledb database (time series library)

timescaledb build

Build a pg database

1. Install yum source (used when the server can access the Internet)

yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

2. Install the client

yum install postgresql11 –y

3. Install the server

yum install postgresql11-server -y

4. Initialize the database

After installing with yum, a passwordless postgres user will be created in the system. Switch to this user on the main node server, and then create a data directory, which will store all configuration files, database files, and log files.

root # mkdir -p /u01/apps/pgsql/data

root # chown -R  postgres:postgres /u01/apps/pgsql/

The installation directory of PostgreSQL is stored in /usr/pgsql-11 by default. Use the following command to initialize the database directory:
execute with postgres user: record
I put

/usr/pgsql-11/bin/initdb -D 【数据目录全路径】

5. Modify the service startup script

Use the root user to modify the /usr/lib/systemd/system/postgresql-11.service file and modify the PGDATA in it to the new data directory

vim  /usr/lib/systemd/system/postgresql-11.service

6. Modify the database configuration

Use the postgres user to enter the self-created data directory and modify the postgresql.conf file:
you must modify listen_addresses, port, max_connections, log_timezone, timezone, and datestyle .

Modify the pg_hda.conf file under the data directory, and add the address that is allowed to connect to the database:

7. Open firewall ports

firewall-cmd --add-port=5432/tcp --permanent
firewall-cmd --reload

8. Start the database service

Start the service: systemctl start postgresql-11
Stop the service: systemctl stop postgresql-11
Restart the service: systemctl restart postgresql-11

9. Modify the database postgres user password

Modify the password of the database postgres user, use the system postgres user to enter psql, and execute the following command:

[root]# su - postgres
上一次登录：二 12月 29 13:35:56 CST 2020pts/0 上
-bash-4.2$ psql
psql (11.5)
输入 "help" 来获取帮助信息.
 postgres=# ALTER USER postgres ENCRYPTED PASSWORD '【密码】';

Second install the plug-in

Install the required plugins

1. Install PostGIS and pgAgent

yum install postgis25_11 -y
yum install pgagent_11 -y

2. Switch to the postgres user, run psql to enter the postgresql client, and run the following command in the postgres database:

Create extension pgagent;

3. Run the following command in the postgresql client to create the database cs2:

Create database cs2;

4. Create a database extension in the cs2 database

Create extension postgis;
Create extension "uuid-ossp";
Create extension "postgres_fdw"

5. Use the root user to start the pgagent service:

systemctl start pgagent_11
systemctl enable pgagent_11

Three changed postgres to timescaledb timing library

1 Install timescaledb-postgresql-11

sudo yum install -y timescaledb-postgresql-11

2 Edit the configuration file

vi  /u01/data/pgdata/postgresql.conf

Modify the content

shared_preload_libraries = 'timescaledb'

Create a directory
mkdir /etc/postgresql/11/main/ # (no directories are created level by level)
Copy files to the directory /etc/postgresql/11/main/

cp /u01/data/pgdata/postgresql.conf /etc/postgresql/11/main/

3 Configure the database (configure as needed)

sudo timescaledb-tune --pg-config=/usr/pgsql-11/bin/pg_config

Note: If the default values ​​are used

sudo timescaledb-tune --pg-config=/usr/pgsql-11/bin/pg_config --quiet --yes

4 Create EXTENSION:

Switch user:

su – postgres
-bash-4.2$ psql
postgres=# CREATE DATABASE 数据库名;
postgres=# \c 数据库名
hrmwv2=# CREATE SCHEMA 模式名;
hrmwv2=# set search_path to 模式名;   #（这一步一定要执行，指定函数在那个模式下）
hrmwv2=# CREATE EXTENSION timescaledb;

The installation is successful when the following effects occur

5. View the database

He will appear a lot of patterns appear, the general installation is successful