【转】Is dnf available for RHEL 8?

博客围绕RHEL 8系统展开,提出dnf是否适用于RHEL 8以及何时会取代yum的问题。决议表明,在RHEL 8 Beta版中,yum被dnf取代,yum命令成为dnf的符号链接,更多信息可参考4.4软件管理部分。

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Is dnf available for RHEL 8?

 SOLUTION IN PROGRESS - 已更新 2019年二月21日22:25 - 

English 

环境

  • Red Hat Enterprise Linux 8

问题

  • When will dnf replace yum in RHEL?
  • Is dnf available in RHEL 8?

决议

  • In RHEL8 Beta, yum is replaced by dnf. The yum command has been made into a symlink to dnf.
### DNF Command Usage in Linux The `dnf` command is a next-generation package manager used on RPM-based distributions, such as Fedora, CentOS, and Red Hat Enterprise Linux (RHEL). It was introduced to address the limitations of its predecessor, `yum`, by improving performance, memory usage, dependency resolution speed, and overall efficiency[^2]. Below are some common usages of the `dnf` command: #### Basic Syntax The general syntax for using the `dnf` command is: ```bash dnf [options] <command> [<package(s)>] ``` #### Common Commands 1. **Install Packages** To install one or more packages, use the following command: ```bash dnf install <package_name> ``` For example, installing the `vim` editor would look like this: ```bash dnf install vim ``` 2. **Update Packages** Update all installed packages with: ```bash dnf update ``` Alternatively, you can specify individual packages to be updated: ```bash dnf update <package_name> ``` 3. **Remove Packages** Remove an installed package along with any dependencies that were automatically added when it was installed: ```bash dnf remove <package_name> ``` 4. **Search for Packages** Search available repositories for specific keywords within package names or descriptions: ```bash dnf search <keyword> ``` 5. **List Installed Packages** List currently installed software packages: ```bash dnf list installed ``` 6. **Check Available Updates** Check which updates are available without applying them immediately: ```bash dnf check-update ``` 7. **Clean Cache** Clear cached data from previous operations to free up disk space: ```bash dnf clean all ``` 8. **History Management** Manage transaction history through commands similar to those provided by `yum`. Example actions include listing transactions (`history list`) or undoing changes made during certain transactions. ```bash dnf history info <transaction_id> dnf history rollback <transaction_id> ``` 9. **Repository Information** Display information about enabled repositories: ```bash dnf repolist ``` #### Advantages Over Yum Compared to `yum`, `dnf` offers several advantages including reduced memory consumption due to better optimization techniques implemented via libraries written in C++ such as hawkey[^4], improved handling scenarios where repository configurations fail since non-responsive ones get skipped instead causing immediate termination. Additionally, users benefit significantly faster execution times thanks largely enhanced algorithms designed specifically around solving complex interdependencies between different components across large-scale environments efficiently while maintaining backward compatibility wherever possible ensuring smooth transition paths exist moving forward into future releases too! ```python import subprocess def run_dnf_command(command_args): try: result = subprocess.run(['dnf'] + command_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True) if result.returncode != 0: raise Exception(f"Error executing 'dnf' command: {result.stderr}") return result.stdout.strip() except FileNotFoundError: return "'dnf' not found." print(run_dnf_command(["list", "installed"])) ```
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