add code skeleton

bash/update_sshd_security/README.md

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+- sshd listen on another port
+- Only take ssh by key, instead of username
+- Reset root password

bash/update_sshd_security/update_sshd_security.sh

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+#!/bin/bash -e
+##-------------------------------------------------------------------
+## @copyright 2016 DennyZhang.com
+## Licensed under MIT
+##   https://raw.githubusercontent.com/DennyZhang/devops_public/tag_v1/LICENSE
+##
+## File : update_sshd_security.sh
+## Author : Denny <[email protected]>
+## Description :
+## --
+## Created : <2015-05-13>
+## Updated: Time-stamp: <2017-06-09 14:20:31>
+##-------------------------------------------------------------------
+function log() {
+    local msg=$*
+    date_timestamp=$(date +['%Y-%m-%d %H:%M:%S'])
+    echo -ne "$date_timestamp $msg\n"
+
+    if [ -n "$LOG_FILE" ]; then
+        echo -ne "$date_timestamp $msg\n" >> "$LOG_FILE"
+    fi
+}
+
+LOG_FILE="/var/log/update_sshd_security.log"
+
+ssh_port=${1:-"2702"}
+root_pwd=${2:-""}
+
+################################################################################
+# Make sure only root can run our script
+if [[ $EUID -ne 0 ]]; then
+    echo "Error: This script must be run as root." 1>&2
+    exit 1
+fi
+## File : update_sshd_security.sh ends