安装Docker 脚本

适用于ubuntu和Centos系统，docker_version参数可根据自己的需求进行修改。
本文参考rancher官网，规避安装docker的繁琐步骤。

#!/bin/sh
set -e

CHANNEL="stable"

#可根据需求修改版本号
docker_version=17.12.1
apt_url="https://apt.dockerproject.org"
yum_url="https://yum.dockerproject.org"
gpg_fingerprint="9DC858229FC7DD38854AE2D88D81803C0EBFCD88"

key_servers="
ha.pool.sks-keyservers.net
pgp.mit.edu
keyserver.ubuntu.com
"

rhel_repos="
rhel-7-server-extras-rpms
rhui-REGION-rhel-server-extras
rhui-rhel-7-server-rhui-extras-rpms
"

mirror=''
while [ $# -gt 0 ]; do
    case "$1" in
        --mirror)
            mirror="$2"
            shift
            ;;
        *)
            echo "Illegal option $1"
            ;;
    esac
    shift $(( $# > 0 ? 1 : 0 ))
done

case "$mirror" in
    AzureChinaCloud)
        apt_url="https://mirror.azure.cn/docker-engine/apt"
        yum_url="https://mirror.azure.cn/docker-engine/yum"
        ;;
    Aliyun)
        apt_url="https://mirrors.aliyun.com/docker-engine/apt"
        yum_url="https://mirrors.aliyun.com/docker-engine/yum"
        ;;
esac

command_exists() {
    command -v "$@" > /dev/null 2>&1
}

echo_docker_as_nonroot() {
    if command_exists docker && [ -e /var/run/docker.sock ]; then
        (
            set -x
            $sh_c 'docker version'
        ) || true
    fi
    your_user=your-user
    [ "$user" != 'root' ] && your_user="$user"
    # intentionally mixed spaces and tabs here -- tabs are stripped by "<<-EOF", spaces are kept in the output
    cat <<-EOF

    If you would like to use Docker as a non-root user, you should now consider
    adding your user to the "docker" group with something like:

      sudo usermod -aG docker $your_user

    Remember that you will have to log out and back in for this to take effect!

    WARNING: Adding a user to the "docker" group will grant the ability to run
             containers which can be used to obtain root privileges on the
             docker host.
             Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
             for more information.

    EOF
}

# Check if this is a forked Linux distro
check_forked() {

    # Check for lsb_release command existence, it usually exists in forked distros
    if command_exists lsb_release; then
        # Check if the `-u` option is supported
        set +e
        lsb_release -a -u > /dev/null 2>&1
        lsb_release_exit_code=$?
        set -e

        # Check if the command has exited successfully, it means we're in a forked distro
        if [ "$lsb_release_exit_code" = "0" ]; then
            # Print info about current distro
            cat <<-EOF
            You're using '$lsb_dist' version '$dist_version'.
            EOF

            # Get the upstream release info
            lsb_dist=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'id' | cut -d ':' -f 2 | tr -d '[[:space:]]')
            dist_version=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'codename' | cut -d ':' -f 2 | tr -d '[[:space:]]')

            # Print info about upstream distro
            cat <<-EOF
            Upstream release is '$lsb_dist' version '$dist_version'.
            EOF
        else
            if [ -r /etc/debian_version ] && [ "$lsb_dist" != "ubuntu" ] && [ "$lsb_dist" != "raspbian" ]; then
                # We're Debian and don't even know it!
                lsb_dist=debian
                dist_version="$(cat /etc/debian_version | sed 's/\/.*//' | sed 's/\..*//')"
                case "$dist_version" in
                    9)
                        dist_version="stretch"
                    ;;
                    8|'Kali Linux 2')
                        dist_version="jessie"
                    ;;
                    7)
                        dist_version="wheezy"
                    ;;
                esac
            fi
        fi
    fi
}

semverParse() {
    major="${1%%.*}"
    minor="${1#$major.}"
    minor="${minor%%.*}"
    patch="${1#$major.$minor.}"
    patch="${patch%%[-.]*}"
}

deprecation_notice() {
    echo
    echo
    echo "  WARNING: $1 is no longer updated @ $url"
    echo "           Installing the legacy docker-engine package..."
    echo
    echo
    sleep 10;
}

do_install() {

    architecture=$(uname -m)
    case $architecture in
        # officially supported
        amd64|x86_64)
            ;;
        # unofficially supported with available repositories
        armv6l|armv7l)
            ;;
        # unofficially supported without available repositories
        aarch64|arm64|ppc64le|s390x)
            cat 1>&2 <<-EOF
            Error: This install script does not support $architecture, because no
            $architecture package exists in Docker's repositories.

            Other install options include checking your distribution's package repository
            for a version of Docker, or building Docker from source.
            EOF
            exit 1
            ;;
        # not supported
        *)
            cat >&2 <<-EOF
            Error: $architecture is not a recognized platform.
            EOF
            exit 1
            ;;
    esac

    if command_exists docker; then
        version="$(docker -v | cut -d ' ' -f3 | cut -d ',' -f1)"
        MAJOR_W=1
        MINOR_W=10

        semverParse $version

        shouldWarn=0
        if [ $major -lt $MAJOR_W ]; then
            shouldWarn=1
        fi

        if [ $major -le $MAJOR_W ] && [ $minor -lt $MINOR_W ]; then
            shouldWarn=1
        fi

        cat >&2 <<-'EOF'
            Warning: the "docker" command appears to already exist on this system.

            If you already have Docker installed, this script can cause trouble, which is
            why we're displaying this warning and provide the opportunity to cancel the
            installation.

            If you installed the current Docker package using this script and are using it
        EOF

        if [ $shouldWarn -eq 1 ]; then
            cat >&2 <<-'EOF'
            again to update Docker, we urge you to migrate your image store before upgrading
            to v1.10+.

            You can find instructions for this here:
            https://github.com/docker/docker/wiki/Engine-v1.10.0-content-addressability-migration
            EOF
        else
            cat >&2 <<-'EOF'
            again to update Docker, you can safely ignore this message.
            EOF
        fi

        cat >&2 <<-'EOF'

            You may press Ctrl+C now to abort this script.
        EOF
        ( set -x; sleep 20 )
    fi

    user="$(id -un 2>/dev/null || true)"

    sh_c='sh -c'
    if [ "$user" != 'root' ]; then
        if command_exists sudo; then
            sh_c='sudo -E sh -c'
        elif command_exists su; then
            sh_c='su -c'
        else
            cat >&2 <<-'EOF'
            Error: this installer needs the ability to run commands as root.
            We are unable to find either "sudo" or "su" available to make this happen.
            EOF
            exit 1
        fi
    fi

    curl=''
    if command_exists curl; then
        curl='curl -sSL'
    elif command_exists wget; then
        curl='wget -qO-'
    elif command_exists busybox && busybox --list-modules | grep -q wget; then
        curl='busybox wget -qO-'
    fi

    # check to see which repo they are trying to install from
    if [ -z "$repo" ]; then
        repo='main'
        if [ "https://test.docker.com/" = "$url" ]; then
            repo='testing'
        elif [ "https://experimental.docker.com/" = "$url" ]; then
            repo='experimental'
        fi
    fi

    # perform some very rudimentary platform detection
    lsb_dist=''
    dist_version=''
    if command_exists lsb_release; then
        lsb_dist="$(lsb_release -si)"
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/lsb-release ]; then
        lsb_dist="$(. /etc/lsb-release && echo "$DISTRIB_ID")"
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/debian_version ]; then
        lsb_dist='debian'
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/fedora-release ]; then
        lsb_dist='fedora'
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/oracle-release ]; then
        lsb_dist='oracleserver'
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/centos-release ]; then
        lsb_dist='centos'
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/redhat-release ]; then
        lsb_dist='redhat'
    fi
    if [ -z "$lsb_dist" ] && [ -r /etc/os-release ]; then
        lsb_dist="$(. /etc/os-release && echo "$ID")"
    fi

    lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"

    # Special case redhatenterpriseserver
    if [ "${lsb_dist}" = "redhatenterpriseserver" ]; then
        # Set it to redhat, it will be changed to centos below anyways
        lsb_dist='redhat'
    fi

    case "$lsb_dist" in

        ubuntu)
            if command_exists lsb_release; then
                dist_version="$(lsb_release --codename | cut -f2)"
            fi
            if [ -z "$dist_version" ] && [ -r /etc/lsb-release ]; then
                dist_version="$(. /etc/lsb-release && echo "$DISTRIB_CODENAME")"
            fi
        ;;

        debian|raspbian)
            dist_version="$(cat /etc/debian_version | sed 's/\/.*//' | sed 's/\..*//')"
            case "$dist_version" in
                9)
                    dist_version="stretch"
                ;;
                8)
                    dist_version="jessie"
                ;;
                7)
                    dist_version="wheezy"
                ;;
            esac
        ;;

        oracleserver)
            # need to switch lsb_dist to match yum repo URL
            lsb_dist="oraclelinux"
            dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//')"
        ;;

        fedora|centos|redhat)
            dist_version="$(rpm -q --whatprovides ${lsb_dist}-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//' | sort | tail -1)"
        ;;

        *)
            if command_exists lsb_release; then
                dist_version="$(lsb_release --codename | cut -f2)"
            fi
            if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
                dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
            fi
        ;;


    esac

    # Check if this is a forked Linux distro
    check_forked

    # Run setup for each distro accordingly
    case "$lsb_dist" in
        ubuntu|debian)
            pre_reqs="apt-transport-https ca-certificates curl"
            if [ "$lsb_dist" = "debian" ] && [ "$dist_version" = "wheezy" ]; then
                pre_reqs="$pre_reqs python-software-properties"
                backports="deb http://ftp.debian.org/debian wheezy-backports main"
                if ! grep -Fxq "$backports" /etc/apt/sources.list; then
                    (set -x; $sh_c "echo \"$backports\" >> /etc/apt/sources.list")
                fi
            else
                pre_reqs="$pre_reqs software-properties-common"
            fi
            if ! command -v gpg > /dev/null; then
                pre_reqs="$pre_reqs gnupg"
            fi
            apt_repo="deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/$lsb_dist $dist_version $CHANNEL"
            (
                set -x
                $sh_c 'apt-get update'
                $sh_c "apt-get install -y -q $pre_reqs"
                curl -fsSl "https://download.docker.com/linux/$lsb_dist/gpg" | $sh_c 'apt-key add -'
                $sh_c "add-apt-repository \"$apt_repo\""
                if [ "$lsb_dist" = "debian" ] && [ "$dist_version" = "wheezy" ]; then
                    $sh_c 'sed -i "/deb-src.*download\.docker/d" /etc/apt/sources.list'
                fi
                $sh_c 'apt-get update'
                $sh_c "apt-get install -y -q docker-ce=$(apt-cache madison docker-ce | grep ${docker_version} | head -n 1 | cut -d ' ' -f 4)"
            )
            echo_docker_as_nonroot
            exit 0
            ;;
        centos|fedora|redhat|oraclelinux)
            yum_repo="https://download.docker.com/linux/centos/docker-ce.repo"
            if [ "$lsb_dist" = "fedora" ]; then
                if [ "$dist_version" -lt "24" ]; then
                    echo "Error: Only Fedora >=24 are supported by $url"
                    exit 1
                fi
                pkg_manager="dnf"
                config_manager="dnf config-manager"
                enable_channel_flag="--set-enabled"
                pre_reqs="dnf-plugins-core"
            else
                pkg_manager="yum"
                config_manager="yum-config-manager"
                enable_channel_flag="--enable"
                pre_reqs="yum-utils"
            fi
            (
                set -x
                    if [ "$lsb_dist" = "redhat" ]; then
                                        for rhel_repo in $rhel_repos ; do
                                                $sh_c "$config_manager $enable_channel_flag $rhel_repo"
                                        done
                                fi
                $sh_c "$pkg_manager install -y -q $pre_reqs"
                $sh_c "$config_manager --add-repo $yum_repo"
                if [ "$CHANNEL" != "stable" ]; then
                    echo "Info: Enabling channel '$CHANNEL' for docker-ce repo"
                    $sh_c "$config_manager $enable_channel_flag docker-ce-$CHANNEL"
                fi
                $sh_c "$pkg_manager makecache fast"
                $sh_c "$pkg_manager install -y -q docker-ce-${docker_version}.ce"
                if [ -d '/run/systemd/system' ]; then
                    $sh_c 'service docker start'
                else
                    $sh_c 'systemctl start docker'
                fi
            )
            echo_docker_as_nonroot
            exit 0
            ;;
        raspbian)
            deprecation_notice "$lsb_dist"
            export DEBIAN_FRONTEND=noninteractive

            did_apt_get_update=
            apt_get_update() {
                if [ -z "$did_apt_get_update" ]; then
                    ( set -x; $sh_c 'sleep 3; apt-get update' )
                    did_apt_get_update=1
                fi
            }

            if [ "$lsb_dist" != "raspbian" ]; then
                # aufs is preferred over devicemapper; try to ensure the driver is available.
                if ! grep -q aufs /proc/filesystems && ! $sh_c 'modprobe aufs'; then
                    if uname -r | grep -q -- '-generic' && dpkg -l 'linux-image-*-generic' | grep -qE '^ii|^hi' 2>/dev/null; then
                        kern_extras="linux-image-extra-$(uname -r) linux-image-extra-virtual"

                        apt_get_update
                        ( set -x; $sh_c 'sleep 3; apt-get install -y -q '"$kern_extras" ) || true

                        if ! grep -q aufs /proc/filesystems && ! $sh_c 'modprobe aufs'; then
                            echo >&2 'Warning: tried to install '"$kern_extras"' (for AUFS)'
                            echo >&2 ' but we still have no AUFS.  Docker may not work. Proceeding anyways!'
                            ( set -x; sleep 10 )
                        fi
                    else
                        echo >&2 'Warning: current kernel is not supported by the linux-image-extra-virtual'
                        echo >&2 ' package.  We have no AUFS support.  Consider installing the packages'
                        echo >&2 ' "linux-image-virtual" and "linux-image-extra-virtual" for AUFS support.'
                        ( set -x; sleep 10 )
                    fi
                fi
            fi

            # install apparmor utils if they're missing and apparmor is enabled in the kernel
            # otherwise Docker will fail to start
            if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
                if command -v apparmor_parser >/dev/null 2>&1; then
                    echo 'apparmor is enabled in the kernel and apparmor utils were already installed'
                else
                    echo 'apparmor is enabled in the kernel, but apparmor_parser is missing. Trying to install it..'
                    apt_get_update
                    ( set -x; $sh_c 'sleep 3; apt-get install -y -q apparmor' )
                fi
            fi

            if [ ! -e /usr/lib/apt/methods/https ]; then
                apt_get_update
                ( set -x; $sh_c 'sleep 3; apt-get install -y -q apt-transport-https ca-certificates' )
            fi
            if [ -z "$curl" ]; then
                apt_get_update
                ( set -x; $sh_c 'sleep 3; apt-get install -y -q curl ca-certificates' )
                curl='curl -sSL'
            fi
            if ! command -v gpg > /dev/null; then
                apt_get_update
                ( set -x; $sh_c 'sleep 3; apt-get install -y -q gnupg2 || apt-get install -y -q gnupg' )
            fi

            # dirmngr is a separate package in ubuntu yakkety; see https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1634464
            if ! command -v dirmngr > /dev/null; then
                apt_get_update
                ( set -x; $sh_c 'sleep 3; apt-get install -y -q dirmngr' )
            fi

            (
            set -x
                        for key_server in $key_servers ; do
                                $sh_c "apt-key adv --keyserver hkp://${key_server}:80 --recv-keys ${gpg_fingerprint}" && break
                        done
                        $sh_c "apt-key adv -k ${gpg_fingerprint} >/dev/null"
            $sh_c "mkdir -p /etc/apt/sources.list.d"
            $sh_c "echo deb \[arch=$(dpkg --print-architecture)\] ${apt_url}/repo ${lsb_dist}-${dist_version} ${repo} > /etc/apt/sources.list.d/docker.list"
            $sh_c 'sleep 3; apt-get update; apt-get install -y -q docker-engine'
            )
            echo_docker_as_nonroot
            exit 0
            ;;
        rancheros)
            (
            set -x
            $sh_c "sleep 3; ros engine switch -f $(sudo ros engine list | grep ${docker_version} | head -n 1 | cut -d ' ' -f 2)"
            )
            exit 0
            ;;
    esac

    # intentionally mixed spaces and tabs here -- tabs are stripped by "<<-'EOF'", spaces are kept in the output
    cat >&2 <<-'EOF'

    Either your platform is not easily detectable or is not supported by this
    installer script.
    Please visit the following URL for more detailed installation instructions:

    https://docs.docker.com/engine/installation/

    EOF
    exit 1
}

# wrapped up in a function so that we have some protection against only getting
# half the file during "curl | sh"
do_install