无法安装screen、iftop、nethogs的解决办法由于Centos8yum源里没有epel，但是呢screen、iftop、nethogs是在epel里面的，解决方法如下：yum -y install epel-release执行命令，出现报错：Failed to set locale, defaulting to C.UTF-8echo "export LC_ALL=en_US.UTF-8" >> /etc/profile source /etc/profileFailed to download metadata for repo 'AppStream'cd /etc/yum.repos.d/ sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-* wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo yum clean all yum makecacheBBR开启CentOS8系统自带了BBR加速，我们只需要修改配置文件激活即可。开启BBRecho "net.core.default_qdisc=fq" >> /etc/sysctl.conf echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf使配置文件生效sysctl -p 重启系统reboot检查BBR的开启状态#两条命令均可 sysctl -n net.ipv4.tcp_congestion_control lsmod | grep bbr