详解如何干净的卸载docker的方法

先上服务器环境信息：

卸载的原因：

宿主机过段时间就磁盘100%了，导致continart异常退出，后来找了很多解决方案，才发现是安装docker的时候有个配置文件错误（正常的应该是|Storage Driver: overlay2）。

上干货：

①卸载

yum remove docker \
         docker-client \
         docker-client-latest \
         docker-common \
         docker-latest \
         docker-latest-logrotate \
         docker-logrotate \
         docker-selinux \
         docker-engine-selinux \
         docker-engine

rm -rf /etc/systemd/system/docker.service.d

rm -rf /var/lib/docker

rm -rf /var/run/docker

②安装

#!/bin/sh
set -e

# This script is meant for quick & easy install via:
#  $ curl -fsSL get.docker.com -o get-docker.sh
#  $ sh get-docker.sh
#
# For test builds (ie. release candidates):
#  $ curl -fsSL test.docker.com -o test-docker.sh
#  $ sh test-docker.sh
#
# NOTE: Make sure to verify the contents of the script
#    you downloaded matches the contents of install.sh
#    located at https://github.com/docker/docker-install
#    before executing.
#
# Git commit from https://github.com/docker/docker-install when
# the script was uploaded (Should only be modified by upload job):
SCRIPT_COMMIT_SHA=36b78b2


# This value will automatically get changed for:
#  * edge
#  * test
#  * experimental
DEFAULT_CHANNEL_VALUE="edge"
if [ -z "$CHANNEL" ]; then
  CHANNEL=$DEFAULT_CHANNEL_VALUE
fi

DEFAULT_DOWNLOAD_URL="https://download.docker.com"
if [ -z "$DOWNLOAD_URL" ]; then
  DOWNLOAD_URL=$DEFAULT_DOWNLOAD_URL
fi

DEFAULT_REPO_FILE="docker-ce.repo"
if [ -z "$REPO_FILE" ]; then
  REPO_FILE="$DEFAULT_REPO_FILE"
fi

SUPPORT_MAP="
x86_64-centos-7
x86_64-fedora-26
x86_64-fedora-27
x86_64-fedora-28
x86_64-debian-wheezy
x86_64-debian-jessie
x86_64-debian-stretch
x86_64-debian-buster
x86_64-ubuntu-trusty
x86_64-ubuntu-xenial
x86_64-ubuntu-bionic
x86_64-ubuntu-artful
s390x-ubuntu-xenial
s390x-ubuntu-bionic
s390x-ubuntu-artful
ppc64le-ubuntu-xenial
ppc64le-ubuntu-bionic
ppc64le-ubuntu-artful
aarch64-ubuntu-xenial
aarch64-ubuntu-bionic
aarch64-debian-jessie
aarch64-debian-stretch
aarch64-debian-buster
aarch64-fedora-26
aarch64-fedora-27
aarch64-fedora-28
aarch64-centos-7
armv6l-raspbian-jessie
armv7l-raspbian-jessie
armv6l-raspbian-stretch
armv7l-raspbian-stretch
armv7l-debian-jessie
armv7l-debian-stretch
armv7l-debian-buster
armv7l-ubuntu-trusty
armv7l-ubuntu-xenial
armv7l-ubuntu-bionic
armv7l-ubuntu-artful
"

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

case "$mirror" in
  Aliyun)
    DOWNLOAD_URL="https://mirrors.aliyun.com/docker-ce"
    ;;
  AzureChinaCloud)
    DOWNLOAD_URL="https://mirror.azure.cn/docker-ce"
    ;;
esac

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

is_dry_run() {
  if [ -z "$DRY_RUN" ]; then
    return 1
  else
    return 0
  fi
}

deprecation_notice() {
  distro=$1
  date=$2
  echo
  echo "DEPRECATION WARNING:"
  echo "  The distribution, $distro, will no longer be supported in this script as of $date."
  echo "  If you feel this is a mistake please submit an issue at https://github.com/docker/docker-install/issues/new"
  echo
  sleep 10
}

get_distribution() {
  lsb_dist=""
  # Every system that we officially support has /etc/os-release
  if [ -r /etc/os-release ]; then
    lsb_dist="$(. /etc/os-release && echo "$ID")"
  fi
  # Returning an empty string here should be alright since the
  # case statements don't act unless you provide an actual value
  echo "$lsb_dist"
}

add_debian_backport_repo() {
  debian_version="$1"
  backports="deb http://ftp.debian.org/debian $debian_version-backports main"
  if ! grep -Fxq "$backports" /etc/apt/sources.list; then
    (set -x; $sh_c "echo \"$backports\" >> /etc/apt/sources.list")
  fi
}

echo_docker_as_nonroot() {
  if is_dry_run; then
    return
  fi
  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
  echo "If you would like to use Docker as a non-root user, you should now consider"
  echo "adding your user to the \"docker\" group with something like:"
  echo
  echo " sudo usermod -aG docker $your_user"
  echo
  echo "Remember that you will have to log out and back in for this to take effect!"
  echo
  echo "WARNING: Adding a user to the \"docker\" group will grant the ability to run"
  echo "     containers which can be used to obtain root privileges on the"
  echo "     docker host."
  echo "     Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface"
  echo "     for more information."

}

# 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
        if [ "$lsb_dist" = "osmc" ]; then
          # OSMC runs Raspbian
          lsb_dist=raspbian
        else
          # We're Debian and don't even know it!
          lsb_dist=debian
        fi
        dist_version="$(sed 's/\/.*//' /etc/debian_version | 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%%[-.]*}"
}

ee_notice() {
  echo
  echo
  echo " WARNING: $1 is now only supported by Docker EE"
  echo "      Check https://store.docker.com for information on Docker EE"
  echo
  echo
}

do_install() {
  echo "# Executing docker install script, commit: $SCRIPT_COMMIT_SHA"

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

    semverParse "$docker_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'
      W