更新零碎软件包列表：sudo yum update -y
增加Docker的官网仓库源：
sudo tee /etc/yum.repos.d/docker-ce.repo << EOF[docker-ce-stable]name=Docker CE Stable - $basearchbaseurl=https://download.docker.com/linux/centos/7/$basearch/stableenabled=1gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-stable-debuginfo]name=Docker CE Stable - Debuginfo $basearchbaseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stableenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-stable-source]name=Docker CE Stable - Sourcesbaseurl=https://download.docker.com/linux/centos/7/source/stableenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-test]name=Docker CE Test - $basearchbaseurl=https://download.docker.com/linux/centos/7/$basearch/testenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-test-debuginfo]name=Docker CE Test - Debuginfo $basearchbaseurl=https://download.docker.com/linux/centos/7/debug-$basearch/testenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-test-source]name=Docker CE Test - Sourcesbaseurl=https://download.docker.com/linux/centos/7/source/testenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-nightly]name=Docker CE Nightly - $basearchbaseurl=https://download.docker.com/linux/centos/7/$basearch/nightlyenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-nightly-debuginfo]name=Docker CE Nightly - Debuginfo $basearchbaseurl=https://download.docker.com/linux/centos/7/debug-$basearch/nightlyenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpg[docker-ce-nightly-source]name=Docker CE Nightly - Sourcesbaseurl=https://download.docker.com/linux/centos/$releasever/source/nightlyenabled=0gpgcheck=1gpgkey=https://download.docker.com/linux/centos/gpgEOFopenEuler.repo:
#generic-repos is licensed under the Mulan PSL v2.#You can use this software according to the terms and conditions of the Mulan PSL v2.#You may obtain a copy of Mulan PSL v2 at:# http://license.coscl.org.cn/MulanPSL2#THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR#IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR#PURPOSE.#See the Mulan PSL v2 for more details.[OS]name=OSbaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/OS/$basearch/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/OS&arch=$basearchmetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/OS/$basearch/RPM-GPG-KEY-openEuler[everything]name=everythingbaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/everything/$basearch/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/everything&arch=$basearchmetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/everything/$basearch/RPM-GPG-KEY-openEuler[EPOL]name=EPOLbaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/EPOL/main/$basearch/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/EPOL/main&arch=$basearchmetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/OS/$basearch/RPM-GPG-KEY-openEuler[debuginfo]name=debuginfobaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/debuginfo/$basearch/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/debuginfo&arch=$basearchmetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/debuginfo/$basearch/RPM-GPG-KEY-openEuler[source]name=sourcebaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/source/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever&arch=sourcemetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/source/RPM-GPG-KEY-openEuler[update]name=updatebaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/update/$basearch/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/update&arch=$basearchmetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/OS/$basearch/RPM-GPG-KEY-openEuler[update-source]name=update-sourcebaseurl=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/update/source/metalink=https://mirrors.openeuler.org/metalink?repo=$releasever/update&arch=sourcemetadata_expire=1henabled=1gpgcheck=1gpgkey=http://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP4/source/RPM-GPG-KEY-openEuler[centos-extras]name=Centos extras - $basearchbaseurl=http://mirror.centos.org/centos/7/extras/x86_64enabled=1gpgcheck=1gpgkey=http://centos.org/keys/RPM-GPG-KEY-CentOS-7装置Docker引擎：sudo yum install docker-ce -y
启动Docker&开机自启动服务：sudo systemctl start dockersystemctl enable docker.service
确认Docker已胜利装置：
docker --version