[手动选题][tech]: 20230301.0 ⭐️ How to Install PgAdmin4 on RHEL 9 Step by Step.md (#28749)

sources/tech/20230301.0 ⭐️ How to Install PgAdmin4 on RHEL 9 Step by Step.md

@@ -0,0 +1,159 @@
+[#]: subject: "How to Install PgAdmin4 on RHEL 9 Step by Step"
+[#]: via: "https://www.linuxtechi.com/how-to-install-pgadmin-on-rhel/"
+[#]: author: "Pradeep Kumar https://www.linuxtechi.com/author/pradeep/"
+[#]: collector: "lkxed"
+[#]: translator: " "
+[#]: reviewer: " "
+[#]: publisher: " "
+[#]: url: " "
+
+How to Install PgAdmin4 on RHEL 9 Step by Step
+======
+
+Pgadmin4is a free and opensource web-based administration and development platform for PostgreSQL. It interacts with PostgreSQL database server on both local and remote servers and displays server statistics using intuitive and interactive dashboards.
+
+Pgadmin4 is a rewrite of Pgadmin 3 and provides the following notable features:
+
+- A responsive web UI with intutive and real-time monitoring dashboards
+- An improved web interface with cool and new panels and icons.
+- An SQL query editor with syntax highlighting.
+- Extensive documentation.
+- Useful tips to help you get started.
+
+In this guide, we will demonstrate how to install Pgadmin4 on RHEL 9.
+
+##### Prerequisites
+
+Before you begin, ensure that you have a RHEL 9 server instance with PostgreSQL database server installed. Check out guide on how to install PostgreSQL 15 on RHEL 9.
+
+With PostgreSQL server installed, carry on with the following steps.
+
+### Step 1) Add Pgadmin4 Repository on RHEL 9
+
+The first step is to add the Pgadmin4 repository on RHEL 9. But first, install the EPEL repository which provides essential software packages.
+
+```
+$ sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
+```
+
+Next, install Pgadmin4’s repository as follows.
+
+```
+$ sudo dnf install -y https://ftp.postgresql.org/pub/pgadmin/pgadmin4/yum/pgadmin4-redhat-repo-2-1.noarch.rpm
+```
+
+Once done, build a cache for Pgadmin4 and EPEL repositories as follows.
+
+```
+$ sudo dnf makecache
+```
+
+### Step 2) Install PgAdmin4 on RHEL 9
+
+Once the Pgadmin4 and EPEL repositories are in place, proceed and install Pgadmin4 using the DNF package manager as shown.
+
+```
+$ sudo dnf install pgadmin4 -y
+```
+
+This installs a myriad of packages including Pgadmin4, Apache HTTP web servers, and Python packages to mention a few.
+
+To confirm that Pgadmin4 has been installed, run the following command:
+
+```
+$ rpm -qi pgadmin4
+```
+
+This prints out quite some information including the name, version, release, and architecture of the installed package.
+
+### Step 3) Start / Enable PgAdmin4 on RHEL 9
+
+At this point, Pgadmin4 is successfully installed. However, you need to go a step further and get it running. To start the Pgadmin4 service, run the command:
+
+```
+$ sudo systemctl start httpd
+```
+
+Be sure also to enable the service to start every time the system boots.
+
+```
+$ sudo systemctl enable httpd
+```
+
+To confirm that Pgadmin4 is running run the command:
+
+```
+$ sudo systemctl status httpd
+```
+
+### Step 4) Initializing PgAdmin4 on RHEL 9
+
+The Pgadmin4 package provides a configurable script for setting up the pgAdmin web service. This allows you to create a user account which is used to authenticate and configure SELinux policies and Apache web server.
+
+Therefore, run the script as follows.
+
+```
+$ sudo /usr/pgadmin4/bin/setup-web.sh
+```
+
+Provide the email and password that you will use as login credentials on the login page.
+
+NOTE:Sometimes, you may encounter a ‘semanage: command not found‘ error as shown in the output below. This indicates that the semanage package is missing.
+
+Semanage, short for SELinux (Security-Enhanced Linux) policy management tool, is a utility used to configure some aspects of SELinux policy without requiring modification to or recompilation from policy sources.
+
+To fix this error, you need to check for the package that provides semanage. You can do this by running the command:
+
+```
+$ sudo dnf provides /usr/sbin/semanage
+```
+
+From the output, you can see that semanage is provided by the  policycoreutils-python-utils-3.3-6.el9_0.noarch  package.
+
+To install this package, run the following command.
+
+```
+$ sudo dnf install policycoreutils-python-utils -y
+```
+
+Once again, run the Pgadmn4 installation script as shown.  Provide the email address and password and type ‘y’ when prompted.
+
+```
+$ sudo /usr/pgadmin4/bin/setup-web.sh
+```
+
+### Step 5) Access the Pgadmin4 Web Interface
+
+At this point, Pgadmin4 is successfully installed. To access it from a web browser, head over to the following address:
+
+http://server-ip/pgadmin4
+
+You will get the following login web interface. Be sure to provide the Email and password you provided when running the installation script and click ‘Login’.
+
+Once logged in, the Pgadmin4 dashboard will come to view as shown.
+
+To add a server that can be administered by Pgadmin4, click ‘Add New Server’
+
+On the ‘General’ tab fill out the name of the server and add comments for better description.
+
+Next, click ‘Connection’ and fill out the Hostname/Address , Port , maintenance database , username and password. Then finally click ‘Save’.
+
+Thereafter, you will see PosrgreSQL server statistics displayed on interactive and intuitive dashboards. On the left sidebar, you can browse various PostgreSQL parameters.
+
+##### Conclusion
+
+We hope you found this guide informative, kindly do post your queries and feedback in below comments section.
+
+--------------------------------------------------------------------------------
+
+via: https://www.linuxtechi.com/how-to-install-pgadmin-on-rhel/
+
+作者：[Pradeep Kumar][a]
+选题：[lkxed][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.linuxtechi.com/author/pradeep/
+[b]: https://github.com/lkxed/