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One-click activation of BBR acceleration in CentOS 7 yum install -y wget && wget -N --no-check-certificate... Change the remote port to 22 (52623) in Ubuntu systemctl disable --now ssh.socket rm -f /etc/systemd/system/ssh.service.d/00-socket.conf rm -f... Install a firewall on Ubuntu sudo apt install ufw sudo ufw enable Enabling BBR in Ubuntu sudo sh -c 'echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf' && sudo sh -c... Removing redundant kernels from CentOS 7 yum remove $(rpm -qa | grep kernel | grep -v $(uname -r))