#!/bin/bash
# vim:sw=4:ts=4:et
<<INFO
AUTHOR:运维@小兵<邮箱号>
DATE:2021-01-28
DESCRIBE:1、rpm方式安装/卸载Docker，可以指定数据盘作为Docker的存储盘
SYSTEM:CentOS7/RedHat7
WARNING:
MODIFY:
INFO

set -e

WORKDIR=$(cd `dirname $0`;pwd)
LOG_PATH=${WORKDIR}/docker.log
DOCKER_VERSION="18.09.0"
DOCKER_STORAGE="/data/docker"       #使用逻辑卷时，挂载到该路径
VG_NAME="dockervg"
LV_NAME="${VG_NAME}_storage"

#${FUNCNAME[1]代表调用该函数的函数，$LINENO代表当前代码行号
Log(){
    local log_level=$1
    local log_info=$2
    local line=$3
    local script_name=$(basename $0)

    case ${log_level} in
    "INFO")
        echo -e "\033[32m$(date "+%Y-%m-%d %T.%N") [INFO]: ${log_info}\033[0m";;
    "WARN")
        echo -e "\033[33m$(date "+%Y-%m-%d %T.%N") [WARN]: ${log_info}\033[0m";;
    "ERROR")
        echo -e "\033[31m$(date "+%Y-%m-%d %T.%N") [ERROR ${script_name} ${FUNCNAME[1]}:$line]: ${log_info}\033[0m";;
    *)
        echo -e "${@}"
    ;;
    esac
}

# 检查当前环境
Check_Env(){
    local docker_status=$(systemctl is-active docker)
    if [[ ${docker_status} != "unknown" ]];then
        Log ERROR "Docker Is Exist" && exit 0
    elif which docker &> /dev/null ]];then
        Log ERROR "Docker Is Exist" && exit 0
    fi
    if ! grep '^docker:' /etc/group &> /dev/null;then
        groupadd docker
    fi
    if [[ ! -d ${WORKDIR}/rpm_x86 ]];then
        Log ERROR "${WORKDIR}/rpm_x86 Not Found" $LINENO && exit 1
    fi
}

# 创建逻辑卷，当作Docker存储路径
Create_Lvm(){
    Log INFO "Begin Create LVM....."
    local disk_name=$1
    local disk_num=$(fdisk -l |grep "${disk_name}" |wc -l)
    [[ ${disk_num} -gt 1 ]] && Log ERROR "${disk_name} Is Used,Please Format or Change New Disk" $LINENO && exit 1
    if pvs | grep -w ${disk_name};then
        Log ERROR "${disk_name} Is Used,Please Format or Change New Disk" $LINENO && exit 1
    fi
    Log INFO "挂载磁盘为:${disk_name}"
    #创建卷组
    if ! vgs | grep -w "${VG_NAME}" >/dev/null;then  
        vgcreate "${VG_NAME}" "${disk_name}"
    else
        Log ERROR "${VG_NAME} Is Exist" $LINENO && exit 1
    fi
    #创建逻辑卷
    if ! lvs | grep -w "${LV_NAME}" >/dev/null;then
        lvcreate -n ${LV_NAME} -l 100%VG ${VG_NAME} -y
        mkfs.ext4 /dev/${VG_NAME}/${LV_NAME} >/dev/null
    else
        Log ERROR "${LV_NAME} Is Exist" $LINENO && exit 1           
    fi
    if lvs | grep -w ${LV_NAME};then
        Log INFO "${LV_NAME} Create Success"
    else
        Log ERROR "${LV_NAME} Create Faild" $LINENO && exit 1
    fi
    # 挂载逻辑卷
    if [[ ! -d ${DOCKER_STORAGE} ]];then
        mkdir -p ${DOCKER_STORAGE}
        local uuid=$(blkid | grep -w "${VG_NAME}-${LV_NAME[i]}" |awk '{print $2}')
        [[ ! -f /etc/fstab.bak ]] && cp /etc/fstab{,.bak}
        sed -ri "s#(.*)${DOCKER_STORAGE}(.*)##" /etc/fstab        #防止多次写入相同的挂载内容
        echo "${uuid} ${DOCKER_STORAGE} ext4 defaults 0 0" >> /etc/fstab
        sed -i '/^$/d' /etc/fstab
        mount -a
        if df -h | grep -w "${DOCKER_STORAGE}";then
            Log INFO "${DOCKER_STORAGE} Mount Success"
        else
            Log ERROR "${DOCKER_STORAGE} Mount Faild" $LINENO && exit 1
        fi
    else
        Log ERROR "${DOCKER_STORAGE} Is Exist" $LINENO && exit 1
    fi
}

# 删除逻辑卷
Remove_Lvm(){
    Log INFO "Begin Remove LVM....."
    local disk_name=$1
    df -h | grep -w "${DOCKER_STORAGE}" &> /dev/null && umount ${DOCKER_STORAGE}
    [[ ! -f /etc/fstab.bak ]] && cp /etc/fstab{,.bak}
    sed -ri "s#(.*)${DOCKER_STORAGE}(.*)##" /etc/fstab
    sed -i '/^$/d' /etc/fstab
    #删除逻辑卷
    if lvs | grep -w "${LV_NAME}" >/dev/null;then
        lvremove -f /dev/${VG_NAME}/${LV_NAME}
    fi
    #删除卷组
    if vgs | grep -w "${VG_NAME}" >/dev/null;then
        vgremove ${VG_NAME}
    fi
    #删除物理卷
    if pvs | grep -w "${disk_name}" >/dev/null;then
        pvremove "${disk_name}"
    fi
    [[ -d ${DOCKER_STORAGE} ]] && rm -rf ${DOCKER_STORAGE}
    Log INFO "Remove LVM Success"
}

# 修改Docker存储路径
Modify_Docker_Storage(){
    [[ ! -d /etc/docker ]] && mkdir /etc/docker
    cat > /etc/docker/daemon.json << EOF
{
    "graph":"${DOCKER_STORAGE}"
}
EOF
}

Install_Docker(){
    Log INFO "Begin Install Docker ${DOCKER_VERSION}....."
    local disk_name=$1
    if [[ -n ${disk_name} ]];then
        Create_Lvm ${disk_name}
        Modify_Docker_Storage
    fi
    Check_Env
    cd ${WORKDIR}/rpm_x86 && rpm -ivh *.rpm --force --nodeps
    systemctl enable docker
    systemctl restart docker
    local docker_status=$(systemctl is-active docker)
    if [[ ${docker_status} == "active" ]];then
        docker -v
        Log INFO "Install Docker Success"
    else
        Log ERROR "Install Docker Faild" $LINENO && exit 1
    fi
}

Uninstall_Docker(){
    Log INFO "Begin Uninstall Docker......"
    local disk_name=$1
    if docker system prune -a -f &> /dev/null;then
        systemctl disable docker
        systemctl stop docker
    else
        Log WARN "Docker Is Stop"
    fi
    yum remove docker-engine docker-engine-selinux -y
    if [[ -n ${disk_name} ]];then
        Remove_Lvm ${disk_name}
    else
        [[ -d /var/lib/docker ]] && rm -rf /var/lib/docker
    fi
    local docker_status=$(systemctl is-active docker)
    if [[ ${docker_status} == "unknown" ]];then
        if ! which docker &> /dev/null;then
            Log INFO "Uninstall Docker Success" && exit 0
        else
            Log ERROR "Uninstall Docker Faild" $LINENO && exit 1
        fi
    else
        Log ERROR "Uninstall Docker Faild" $LINENO && exit 1
    fi
}

#帮助信息
Help(){
	cat << EOF
Usage: 
=======================================================================
optional arguments:
    help                 提供帮助信息
    install              安装docker，存储路径为/var/lib/docker
    install /dev/xvde    安装docker,创建逻辑卷，存储路径为:${DOCKER_STORAGE}
    uninstal             卸载docker,如果安装时指定了磁盘，卸载也需要指定磁盘
EXAMPLE:
    bash install_docker.sh install /dev/xvde
    bash install_docker.sh uninstall /dev/xvde
    bash install_docker.sh install
    bash install_docker.sh uninstall
EOF
}

######################主程序######################
[[ $UID -ne 0 ]] && Log ERROR "Please Use Admin(root) Excute......" $LINENO | tee -a ${LOG_PATH} && exit 1
[[ $# -ne 1 && $# -ne 2 ]] && Help && exit 1

if [[ -n $2 ]];then
    if [[ -b $2 ]];then
        DISK_NAME=$2
        echo $2
    else
        Log ERROR "$2 Not Is Disk Or Not Found" $LINENO | tee -a ${LOG_PATH} && exit 1
    fi
fi

case $1 in
install)
    Install_Docker ${DISK_NAME} | tee -a ${LOG_PATH};;
uninstall)
    Uninstall_Docker ${DISK_NAME} | tee -a ${LOG_PATH};;
help)
    Help;;
*)
    Log ERROR "Invalid option:bash `basename $0` help" $LINENO | tee -a ${LOG_PATH} && exit 1
esac