Bash Script for Installing MongoDB on Linux

This script automates the installation of MongoDB on Linux, including OS detection, prerequisite package installation, downloading the MongoDB tarball, extracting it, setting up directories, creating symbolic links, updating the system PATH, and starting the mongod service with appropriate logging and color‑coded status messages.

#!/bin/bash
#******************************************
#FileName: install_mongodb.sh
#Description: The test script
#******************************************
file=mongodb-linux-x86_64-ubuntu1804-4.4.4.tgz
url=https://fastdl.mongodb.org/linux/$file
install_dir=/usr/local
db_dir=/data/db
port=27017

color () {
    RES_COL=60
    MOVE_TO_COL="echo -en \033[${RES_COL}G"
    SETCOLOR_SUCCESS="echo -en \033[1;32m"
    SETCOLOR_FAILURE="echo -en \033[1;31m"
    SETCOLOR_WARNING="echo -en \033[1;33m"
    SETCOLOR_NORMAL="echo -en \E[0m"
    echo -n "$2" && $MOVE_TO_COL && echo -n "$1" && $SETCOLOR_NORMAL
}

os_type () {
    awk -F '[=]"' '/^NAME/{print $2}' /etc/os-release
}

check () {
    [ -e $db_dir -o -e $install_dir/mongodb ] && {
        color $SETCOLOR_SUCCESS "MongoDB 数据库已安装"; exit; }
    if [ `os_type` = "CentOS" ]; then
        rpm -q curl &>/dev/null || yum install -y -q curl
    elif [ `os_type` = "Ubuntu" ]; then
        dpkg -l curl &>/dev/null || apt -y install curl
    else
        color $SETCOLOR_WARNING "不支持当前操作系统"; exit
    fi
}

file_prepare () {
    if [ ! -e $file ]; then
        curl -O $url || { color $SETCOLOR_FAILURE "MongoDB 数据库文件下载失败"; exit; }
    fi
}

install_mongodb () {
    tar xf $file -C $install_dir
    mkdir -p $db_dir
    ln -s $install_dir/mongodb-linux-x86_64-* $install_dir/mongodb
    echo PATH=$install_dir/mongodb/bin/:'$PATH' > /etc/profile.d/mongodb.sh
    . /etc/profile.d/mongodb.sh
    mongod --dbpath $db_dir --bind_ip_all --port $port --logpath $db_dir/mongod.log --fork
    if [ $? -eq 0 ]; then
        color $SETCOLOR_SUCCESS "MongoDB 数据库安装成功" || color $SETCOLOR_FAILURE "MongoDB 数据库安装失败"
    fi
}

check
file_prepare
install_mongodb

After execution, the script verifies the installation, prepares the necessary files, installs MongoDB, and starts the server, providing clear success or error messages with colored output for better readability.