# Install Percona Distribution for PostgreSQL on Red Hat Enterprise Linux and derivatives


This document describes how to install Percona Distribution for PostgreSQL from Percona repositories on RPM-based distributions such as Red Hat Enterprise Linux and compatible derivatives.

## Platform specific notes

To install Percona Distribution for PostgreSQL, do the following:

### For Percona Distribution for PostgreSQL packages

=== "CentOS 7"

    Install the `epel-release` package:

    ```{.bash data-prompt="$"}
    $ sudo yum -y install epel-release
    $ sudo yum repolist
    ```

=== "RHEL8/Oracle Linux 8/Rocky Linux 8"

    Disable the ``postgresql``  and ``llvm-toolset``modules:    

    ```{.bash data-prompt="$"}
    $ sudo dnf module disable postgresql llvm-toolset
    ```

### For `percona-postgresql{{pgversion}}-devel` package

You may need to install the `percona-postgresql{{pgversion}}-devel` package when working with some extensions or creating programs that interface with PostgreSQL database. This package requires dependencies that are not part of the Distribution, but can be installed from the specific repositories:

=== "RHEL8"

    ```{.bash data-prompt="$"}
    $ sudo yum --enablerepo=codeready-builder-for-rhel-8-rhui-rpms install perl-IPC-Run -y
    ```

=== "Rocky Linux 8"

    ```{.bash data-prompt="$"}
    $ sudo dnf install dnf-plugins-core
    $ sudo dnf module enable llvm-toolset
    $ sudo dnf config-manager --set-enabled powertools
    ```

=== "Oracle Linux 8"

    ```{.bash data-prompt="$"}
    $ sudo dnf config-manager --set-enabled ol8_codeready_builder install perl-IPC-Run -y
    ```

=== "Rocky Linux 9"

    ```{.bash data-prompt="$"}
    $ sudo dnf install dnf-plugins-core
    $ sudo dnf module enable llvm-toolset
    $ sudo dnf config-manager --set-enabled crb
    $ sudo dnf install perl-IPC-Run -y
    ```

=== "Oracle Linux 9"

    ```{.bash data-prompt="$"}
    $ sudo dnf config-manager --set-enabled ol9_codeready_builder install perl-IPC-Run -y
    ```

### For `percona-patroni` package

To install Patroni on Red Hat Enterprise Linux 9 and compatible derivatives, enable the `epel` repository:

```{.bash data-prompt="$"}
$ sudo yum install epel-release
```

### For `pgpool2` extension

To install `pgpool2` on Red Hat Enterprise Linux and compatible derivatives, enable the codeready builder repository first to resolve the dependencies conflict.

The following are commands for Red Hat Enterprise Linux 9 and derivatives. For Red Hat Enterprise Linux 8, replace the operating system version in the commands accordingly. 

=== "RHEL 9"

    ```{.bash data-prompt="$"}
    $ sudo dnf config-manager --set-enabled codeready-builder-for-rhel-9-x86_64-rpms
    ```

=== "Rocky Linux 9"

    ```{.bash data-prompt="$"}
    $ sudo dnf config-manager --set-enabled crb
    ```

=== "Oracle Linux 9"

    ```{.bash data-prompt="$"}
    $ sudo dnf config-manager --set-enabled ol9_codeready_builder
    ```


### For PostGIS 

The following commands provide instructions how to enable required repositories and modules on Red Hat Enterprise Linux 9 and derivatives.

For Red Hat Enterprise Linux 8 and derivatives, replace the operating system version in the commands accordingly.

=== "RHEL 9"     

    1. Install `epel` repository

        ```{.bash data-prompt="$"}
        $ sudo yum install epel-release
        ```

    2. Enable the `llvm-toolset dnf` module

          ```{.bash data-prompt="$"}
          $ sudo dnf module enable llvm-toolset
          ```

    3. Enable the codeready builder repository to resolve dependencies conflict. 

        ```{.bash data-prompt="$"}
        $ sudo dnf config-manager --set-enabled codeready-builder-for-rhel-9-x86_64-rpms
        ```

=== "Rocky Linux 9"

    1. Install `epel` repository

        ```{.bash data-prompt="$"}
        $ sudo yum install epel-release
        ```

    2. Enable the `llvm-toolset dnf` module

        ```{.bash data-prompt="$"}
        $ sudo dnf module enable llvm-toolset
        ```

    3. Enable the codeready builder repository to resolve dependencies conflict.

        ```{.bash data-prompt="$"}
        $ sudo dnf install dnf-plugins-core
        $ sudo dnf config-manager --set-enabled crb
        ```

=== "Oracle Linux 9"

    1. Install `epel` repository

        ```{.bash data-prompt="$"}
        $ sudo yum install epel-release
        ```

    2. Enable the `llvm-toolset dnf` module

        ```{.bash data-prompt="$"}
        $ sudo dnf module enable llvm-toolset
        ```

    3. Enable the codeready builder repository to resolve dependencies conflict.

        ```{.bash data-prompt="$"}
        $ sudo dnf config-manager --set-enabled ol9_codeready_builder
        ```

=== "RHEL UBI 9"

    1. Configure the Oracle-Linux repository. Create the `/etc/yum.repos.d/oracle-linux-ol9.repo` file to install the required dependencies: 

        ```init title="/etc/yum.repos.d/oracle-linux-ol9.repo"
        [ol9_baseos_latest]
        name=Oracle Linux 9 BaseOS Latest ($basearch)
        baseurl=https://yum.oracle.com/repo/OracleLinux/OL9/baseos/latest/$basearch/
        gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
        gpgcheck=1
        enabled=1     

        [ol9_appstream]
        name=Oracle Linux 9 Application Stream ($basearch)
        baseurl=https://yum.oracle.com/repo/OracleLinux/OL9/appstream/$basearch/
        gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
        gpgcheck=1
        enabled=1     

        [ol9_codeready_builder]
        name=Oracle Linux 9 CodeReady Builder ($basearch) - Unsupported
        baseurl=https://yum.oracle.com/repo/OracleLinux/OL9/codeready/builder/$basearch/
        gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
        gpgcheck=1
        enabled=1
        ```

    2. Download the right GPG key for the Oracle Yum Repository:    

        ```{.bash data-prompt="$"}
        $ wget https://yum.oracle.com/RPM-GPG-KEY-oracle-ol9 -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
        ```    

    3. Install `epel` repository    

        ```{.bash data-prompt="$"}
        $ sudo yum install epel-release
        ```     

## Procedure

Run all the commands in the following sections as root or using the `sudo` command.

### Install dependencies

Install `curl` for [Telemetry](telemetry.md). We use it to better understand the use of our products and improve them.

```{.bash data-prompt="$"}
$ sudo yum -y install curl
```

### Configure the repository

1. Install the `percona-release` repository management tool to subscribe to Percona repositories:

    ```{.bash data-prompt="$"}
    $ sudo yum install https://repo.percona.com/yum/percona-release-latest.noarch.rpm
    ```

2. Enable the repository

   Percona provides [two repositories](repo-overview.md) for Percona Distribution for PostgreSQL. We recommend enabling the Major release repository to timely receive the latest updates. 

   To enable a repository, we recommend using the `setup` command: 

   ```{.bash data-prompt="$"}
   $ sudo percona-release setup ppg{{pgversion}}
   ```

### Install packages

=== "Install using meta-package"
     
     ```{.bash data-prompt="$"}
     $ sudo yum install percona-ppg-server{{pgversion}}
     ```

=== "Install packages individually"

     1. Install the PostgreSQL server package:

         ```{.bash data-prompt="$"}
         $ sudo yum install percona-postgresql{{pgversion}}-server
         ```

     2. Install the components:

        Install `pg_repack`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pg_repack{{pgversion}}
        ```

        Install `pgaudit`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pgaudit{{pgversion}}
        ```

        Install `pgBackRest`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pgbackrest
        ```

        Install `Patroni`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-patroni
        ```

        [Install `pg_stat_monitor`](pg-stat-monitor.md):


        Install `pgBouncer`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pgbouncer
        ```

        Install `pgAudit-set_user`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pgaudit{{pgversion}}_set_user
        ```

        Install `pgBadger`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pgbadger
        ```

        Install `wal2json`:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-wal2json{{pgversion}}
        ```

        Install PostgreSQL contrib extensions:

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-postgresql{{pgversion}}-contrib
        ```

        Install HAProxy
        
        ```{.bash data-prompt="$"}
        $ sudo yum install percona-haproxy
        ```
        
        Install `pg_gather`

        ```{.bash data-prompt="$"}
        $ sudo yum install percona-pg_gather
        ```

        Install `pgpool2`

        1. Check the [platform specific notes](#for-pgpool2-extension)
        2. Install the extension

            ```{.bash data-prompt="$"}
            $ sudo yum install percona-pgpool-II-pg{{pgversion}}
            ```

        Some extensions require additional setup in order to use them with Percona Distribution for PostgreSQL. For more information, refer to [Enabling extensions](enable-extensions.md).

### Start the service

After the installation, the default database storage is not automatically initialized. To complete the installation and start Percona Distribution for PostgreSQL, initialize the database using the following command:

```{.bash data-prompt="$"}
$ /usr/pgsql-{{pgversion}}/bin/postgresql-{{pgversion}}-setup initdb
```

Start the PostgreSQL service:

```{.bash data-prompt="$"}
$ sudo systemctl start postgresql-{{pgversion}}
```

### Connect to the PostgreSQL server

By default, `postgres` user and `postgres` database are created in PostgreSQL upon its installation and initialization. This allows you to connect to the database as the `postgres` user.

```{.bash data-prompt="$"}
$ sudo su postgres
```

Open the PostgreSQL interactive terminal:

```{.bash data-prompt="$"}
$ psql
```

!!! hint

    You can connect to `psql` as the `postgres` user in one go:

    ```{.bash data-prompt="$"}
    $ sudo su - postgres -c psql
    ```

To exit the `psql` terminal, use the following command:

```{.bash data-prompt="$"}
$ \q
```