kvm 创建虚拟机脚本（centos7）

Posted 2021-02-13

#!/bin/bash
#创建单个虚拟机（需要电脑中存在模板虚拟机）

#获取新虚拟机名称（单个创建模式）
get_newname(){
    while true
        do
                read -p "请输入新虚拟机名称：" newname
                if [ $newname ];then
                        break
                else
                        echo "************"
                        echo "请输入姓名！"
                        echo "************"
                fi
        done
}
get_newmemary(){
    while true
        do
                current_free_mem=`free -h|awk ‘/^Mem/{print $4}‘|sed  -r ‘s/(.*).$/1/‘`
                mem_total=`free -h|awk ‘/^Mem/{print $2}‘|sed  -r ‘s/(.*).$/1/‘`
                echo "目前本机内存总大小：${mem_total} G"
                echo "当前空闲内存大小为：${current_free_mem} MB"
                read -p "请输入新虚拟机内存大小(单位G)：" newmemary
                if [ $newmemary ];then
                        if [[ $newmemary < $mem_total ]];then
                                break
                        else
                                echo "**********************************"
                                echo "输入的数值必须小于当前内存总大小！"
                                echo "**********************************"
                        fi
                else
                        echo "********************"
                        echo "请输入新虚拟机内存！"
                        echo "********************"
                fi
        done
}
get_newcpu(){
    while true
        do
                core=`cat /proc/cpuinfo| grep "processor"| wc -l`
                echo "可用core个数：${core}"
                read -p "请输入新虚拟机处理器核数：" newcpu
                if [ $newcpu ];then
                        if [ $newcpu -le $core ];then
                                break
                        else
                                echo "******************************"
                                echo "不能超过可用个数或者输入错误！"
                                echo "******************************"
                        fi
                else
                        echo "**************"
                        echo "输入不能为空！"
                        echo "**************"
                fi
        done
}
#设置虚拟机名称（自定义创建多个虚拟机）
set_group_name(){
    #虚拟机个数
        read -p "新虚拟机个数：" vir_num
        free_vir=$vir_num
        #功能分组
        echo "**********************************************************************************"
        echo "设置好组名之后，虚拟机将每组下的虚拟机自动用【组名01、组名01、组名03、...】的形式命名"
        echo "**********************************************************************************"
        read -p "需要分几种功能类型(大于1)：" vir_type
        if [ ${vir_type} -gt ${vir_num} ];then
                echo "输入不符合规则！"
                exit
        fi
        #设置名字,组名+数字
        k=1
        for((i=1;i<=${vir_type};i++))
        do
                read -p "第${i}组组名：" group[$i]
                read -p "分配新虚拟机个数:" group_num_vir
                #检测输入
                free_vir=$((${free_vir}-${group_num_vir}))
                if [ ${group_num_vir} -gt ${vir_num} ];then
                        echo "输入错误，超过自定义虚拟机个数！"
                        exit
                elif [ ${free_vir} -lt $((${vir_type}-${i})) ];then
                        echo "分配不均,请重新分配！"
                        exit
                fi
                #记录组内虚拟机个数
                for((j=1;j<=${group_num_vir};j++))
                do
                        name_n="${group[$i]}${j}"
                        name[${k}]=${name_n}
                        k=$(($k+1))
                done
        done
    echo "准备创建如下虚拟机："
        for((i=1;i<=${vir_num};i++))
        do
                echo ${name[${i}]}
        done    
}
#设置xml所需参数
set_xml_args_single(){
    uuid=`uuidgen`
        src_path=/mnt/lv2/centos7.0.qcow2
        src_xml=/etc/libvirt/qemu/centos7.0.xml
        new_path=/mnt/lv1/${newname}.qcow2
        new_path_sed="/mnt/lv1/${newname}.qcow2"
        new_xml=/etc/libvirt/qemu/${newname}.xml
}
#设置xml所需参数(多个)，例如：【set_xml_args ${name[${i}]} $new_memary $new_cpu】
set_xml_args(){
    newname=$1
        newmemary=$2
        newcpu=$3
    uuid=`uuidgen`
        src_path=/mnt/lv2/centos7.0.qcow2
        src_xml=/etc/libvirt/qemu/centos7.0.xml
        new_path=/mnt/lv1/${newname}.qcow2
        new_path_sed="/mnt/lv1/${newname}.qcow2"
        new_xml=/etc/libvirt/qemu/${newname}.xml
}
#复制模板、xml
copy_model_xml(){
    cp $src_path $new_path
        cp $src_xml $new_xml
}
#修改xml文件
modification_xml(){
    sed -ri "s/(<name>).*(</name>)/1${newname}2/" $new_xml
        sed -ri "s/(<uuid>).*(</uuid>)/1${uuid}2/" $new_xml
        mem_kb=$((${newmemary}*1024*1024))

        sed -ri "s/(<memory.*>).*(</memory>)/1${mem_kb}2/" $new_xml
        sed -ri "s/(<currentMemory.*>).*(</currentMemory>)/1${mem_kb}2/" $new_xml
        sed -ri "s/(<vcpu.*>).*(</vcpu>)/1${newcpu}2/" $new_xml
        sed -ri "s/(<source file=‘).*(‘/>)/1${new_path_sed}2/" $new_xml

        mac_addr=`openssl rand -hex 3 | sed -r ‘s/..B/&:/g‘`

        sed -ri "s/(<mac address=‘..:..:..:).*(‘/>)/1${mac_addr}2/" $new_xml
}
#define
define_vir_single(){
    virsh define $new_xml
    echo "**********"
    echo "${newname}建完成！"
    echo "**********"
}
#------------运行分界线------------------------------------
echo "1)single"
echo "2)group"
read -p "选择你的操作：" str
case $str in
single)
    get_newname
    get_newmemary
    get_newcpu
    set_xml_args_single
    copy_model_xml
    modification_xml
    define_vir_single
;;
group)
    set_group_name
    get_newmemary
    get_newcpu
    for((i=1;i<=${vir_num};i++))
    do
        set_xml_args ${name[${i}]} $newmemary $newcpu
        copy_model_xml
        modification_xml
        define_vir_single
    done
;;
*)
    exit
;;
esac