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linux centos修改ssh端口脚本

2022年9月1日

linux修改ssh端口脚本
方法一：
复制以下内容到脚本ssh.sh然后使用命令sh ssh.sh就可以了。

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# Use default SSH port 22. If you use another SSH port on your server
if [ -e "/etc/ssh/sshd_config" ];then
    [ -z "`grep ^Port /etc/ssh/sshd_config`" ] && ssh_port=22 || ssh_port=`grep ^Port /etc/ssh/sshd_config | awk '{print $2}'`
    while :; do echo
        read -p "Please input SSH port(Default: $ssh_port): " SSH_PORT
        [ -z "$SSH_PORT" ] && SSH_PORT=$ssh_port
        if [ $SSH_PORT -eq 22 >/dev/null 2>&1 -o $SSH_PORT -gt 1024 >/dev/null 2>&1 -a $SSH_PORT -lt 65535 >/dev/null 2>&1 ];then
            break
        else
            echo "${CWARNING}input error! Input range: 22,1025~65534${CEND}"
        fi
    done
 
    if [ -z "`grep ^Port /etc/ssh/sshd_config`" -a "$SSH_PORT" != '22' ];then
        sed -i "s@^#Port.*@&\nPort $SSH_PORT@" /etc/ssh/sshd_config
    elif [ -n "`grep ^Port /etc/ssh/sshd_config`" ];then
        sed -i "s@^Port.*@Port $SSH_PORT@" /etc/ssh/sshd_config
    fi
	cp /etc/selinux/config /etc/selinux/config_$baktime
sed -i '/SELINUX/s/\(enforcing\|permissive\)/disabled/' /etc/selinux/config
if [ -e /etc/sysconfig/selinux ]
   then
       cp /etc/sysconfig/selinux /etc/sysconfig/selinux_$baktime
       sed -i '/SELINUX/s/\(enforcing\|permissive\)/disabled/' /etc/sysconfig/selinux
fi
setenforce 0
systemctl enable firewalld
systemctl start firewalld
firewall-cmd --zone=public --add-port=$SSH_PORT/tcp --permanent
firewall-cmd --reload
service sshd restart
fi

方法二：（推荐）
以下这个直接运行就更快捷。

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firewall-cmd --zone=public --add-port=8899/tcp --permanent
firewall-cmd --reload
sed -i '/#Port 22/s/#Port 22/Port 8899/' /etc/ssh/sshd_config
sed -i '/#UseDNS yes/s/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
service sshd restart
/bin/systemctl restart sshd.service

8899就是更改后的端口。自己改变一下。

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