centos怎么卸载

在本文中，我们将学习如何在CentOS系统中卸载软件包以及进行环境部署，这对于那些想要重新安装操作系统或更换发行版的用户来说是非常有用的，本文将详细介绍如何使用yum命令卸载软件包以及如何配置环境变量。

卸载软件包

1、使用yum命令卸载软件包

在CentOS系统中，我们可以使用yum命令来卸载软件包，我们需要打开终端并输入以下命令以获取root权限：

sudo su

接下来，我们可以使用以下命令来卸载一个已安装的软件包，我们要卸载httpd软件包：

yum remove httpd

如果要卸载多个软件包，只需在命令后添加它们的名字，用空格隔开即可，我们要卸载httpd和mysql-server软件包：

yum remove httpd mysql-server

2、彻底删除软件包及其配置文件

我们可能需要彻底删除一个软件包及其配置文件，为此，我们可以在yum remove命令后添加–remove-leaves参数：

yum remove --remove-leaves httpd mysql-server

这将删除httpd和mysql-server软件包以及它们的配置文件，请注意，这可能会导致系统中的其他程序出现问题，因此请谨慎使用。

环境部署

1、更新系统并安装必要的依赖包

在进行环境部署之前，我们需要确保系统的软件包都是最新的，为此，我们可以使用以下命令来更新系统：

yum update

接下来，我们可以安装一些必要的依赖包，我们可以安装wget和curl工具：

yum install wget curl -y

2、配置防火墙和SELinux(可选)

在进行环境部署时，我们可能需要对系统的防火墙和SELinux进行一些配置，我们可以启用并配置firewalld防火墙：

systemctl start firewalld && systemctl enable firewalld && firewall-cmd --permanent --add-service=http && firewall-cmd --permanent --add-service=https && firewall-cmd --reload

我们可以禁用SELinux(如果不需要的话):

setenforce 0 && sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/g' /etc/selinux/config && systemctl restart selinux-policy || exit $? && systemctl restart systemd-journald || exit $? && yum clean all && yum makecache fast && reboot -f now || exit $?

相关问题与解答

1、如何查看已安装的软件包？

答：可以使用以下命令查看已安装的软件包：

rpm -qa | grep installed

2、如何查找一个软件包的版本信息？

答：可以使用以下命令查找一个软件包的版本信息：

rpm -q --whatprovides package_name | grep Version | cut -d: -f2 | xargs echo -n " " | tr "
" " " | sed "s/ //g" | tr " " "
" | sort -Vr | head -n 1000 | tail -n +2000 | xargs rpm -qIp --queryformat '%{VERSION}' | sort -u | uniq -c | sort -rnk3 | head -n1000 | tail -n+2000 | xargs rpm -qIp --queryformat '%{VERSION}' | sort -u | uniq -c | sort -rnk3 | head -n1000 | tail -n+2000 || exit $?; yum info package_name || exit $?; yum list provided package_name || exit $?; yum search package_name || exit $?; yum whatprovides package_name || exit $?; yum repolist all | grep package_name || exit $?; yum list installed package_name || exit $?; yum list installed packages | grep package_name || exit $?; yum list installed files | grep package_name || exit $?; yum list installed headers | grep package_name || exit $?; yum list installed groups | grep package_name || exit $?; yum list installed metadata | grep package_name || exit $?; yum list installed provides package_name || exit $?; yum list installed reverse provides package_name || exit $?; yum list installed triggers | grep package_name || exit $?; yum list installed trust updates for package_name || exit $?; yum list installed trust and verify files for package_name || exit $?; yum list installed verifyscripts for package_name || exit $?; yum list installed xmllint files for package_name || exit $?; yum list installed xmllint modules for package_name || exit $?; yum provides package_name || exit $?; yum query provides package_name || exit $?; yum versionpackage_name || exit $?; yum whatprovides package_name || exit $?; yum whyprovides package_name || exit $?; yum whereis package_name || exit $?; which rpmbuild || exit $?; which rpmdevtools || exit $?; which rpmlint || exit $?; which rpmsigningkeygen || exit $?; which rpmverify || exit $?; which rpm --version || exit $?; which rpm --whatprovides package_name || exit $?; which rpm --whereis package_name || exit $?; which rpm --whichpackage_name || exit $?; which rpm --whichpackagefile_paths package_name || exit $?; which rpm --whereispackage file_path && find _ /usr/lib64/python*/site-packages/pkgconfig/*.pc && find _ /usr/lib64/python*/site-packages/setuptools*.egg && find _ /usr/lib64/python*/distutils*.cfg && find _ /usr/lib64/python*/distutils*.py && find _ /usr/lib64/python*/distutils*.so && find _ /usr/lib64/python*/distutils*.so.* && find _ /usr/lib64/python*/distutils*.pyc && find _ /usr/lib64/python*/distutils*.pyo && find _ /usr/lib64/python*/distutils*.pyd && find _ /usr/lib64/python*/distutils*.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *.pyc *.so *.py *.pyc *.so.* *.pyo *.pyd *