One, install docker
Step1: Check whether the installation environment meets the docker installation requirements
Check whether the kernel kernel is above 3.10 : ~$ uname -a
Linux dlserver 4.15.0-33-generic #36~16.04.1-Ubuntu SMP Wed Aug 15 17:21:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
检查Device Mapper：~$ sudo grep device-mapper /proc/devices
253 device-mapper
Step2: Make sure that apt can use https and the CA certificate has been installed
sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
Step3: Uninstall the old version that may exist
sudo apt-get remove docker docker-engine docker-ce docker.io
Step4: Add Docker official gpg key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
Step5: Set up stable repository
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Step6: Update apt
sudo apt-get update
Step7: Check the docker version, install the specified version or the latest version
apt-cache madison docker-ce
Install the specified version
sudo apt-get install -y docker-ce=version number
Install the latest version
sudo apt-get install -y docker-ce
Two, modify the default storage path of docker
Step1: Stop the docker service: sudo service docker stop
Step2: Edit the file docker-overlay.conf
cd /etc/systemd/system/docker.service.d Create this path if there is no docker.service.d
sudo vim docker-overlay.conf If not, create this file
Add something to the file, save and exit
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd --graph="New storage path" --storage-driver=overlay
Step3: restart docker
systemctl daemon-reload
sudo service docker start
Step4: Check the docker information to confirm whether the modification is successful
sudo docker info