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Docker is the basic running environment of POD. Kubernetes uses dockerd as the runtime running engine by default. Before installing docker-ce, you must upgrade the kernel to the latest lts version. This is because in order for docker-ce to support the datastore type overlay2, docker-ce will be deployed as binaries on all worker nodes.

1. Preparation # Variable parameter setting # # DOCKER_INSTALL_PATH=/data/apps/k8s/dockerSOFTWARE=/root/softwareVERSION=18.09.6PACKAGE=docker-$ {VERSION} .tgzDownload _ URL= https://download.docker.com/linux/static/stable/x86_64/$PACKAGEMIRRORS1=https://docker.mirrors.ustc.edu.cnMIRRORS2=https://registry-mirrors.mo9.comUSER=docker2. Install docker prepare the docker-ce installation environment # 1.Uninstall the original docker installation packagesudo yum-y remove docker docker-client\ docker-client-latest docker-common docker-latest\ docker-latest-logrotate docker-selinux docker-engine-selinux docker-engine # 2 Setting firewall rules for docker/sbin/iptables-P FORWARD ACCEPTsudo sed-I'/ iptables-P FORWARD ACCEPT/d' / etc/rc.localecho-e "/ sbin/iptables-P FORWARD ACCEPT" > > / etc/rc.local### 3.Install docker-ce package with yum.sudo yum install-y yum-utils device-mapper-persistent-data lvm2 bridge-utils sudo yum-config-manager\-- add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo creates the installation directory related to docker installation and the dockers user group # 4.Install docker-ce package with source.# Check if the install directory exists and Check if the docker group exists .if [!-d $DOCKER_INSTALL_PATH/bin] Then mkdir-p $DOCKER_INSTALL_PATH/binfiegrep "^ $USER" / etc/group-if [$?-ne 0]; then groupadd $USERfi### 5.Download source package of docker-ceif [!-f "$SOFTWARE/docker-$ {VERSION} .tgz"] Then wget $DOWNLOAD_URL-P $SOFTWARE > > / dev/null 2 > & 1ficd $SOFTWARE & & tar-zxf $SOFTWARE/docker-$ {VERSION} .tgz-C. / sudo cp-fp $SOFTWARE/docker/* $DOCKER_INSTALL_PATH/bincd $DOCKER_INSTALL_PATH/bin/ln-sf docker,dockerd,containerd,containerd-shim,runc,ctr / usr/local/bin### 6.Create daemon.json file for docker# Create daemon.json file pathif [!-d "/ etc/docker"] Then mkdir / etc/docker/fidocker runs as root users by default. For security reasons and to facilitate other users to call docker api, you need to create a docker group user to create a docker profile cat > / etc/docker/daemon.json

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