Docker on CentOS 8
Installing and running Docker on CentOS 8
Notes
Using a fresh instance with CentOS 8: 4.18.0-80.11.2.el8_0.x86_64
Installation
Pre-requisites and addition repo (using dnf instead of yum now):
sudo dnf install yum-utils device-mapper-persistent-data lvm2
sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
Finding the latest docker-ce release:
$ dnf list docker-ce
Last metadata expiration check: 0:02:52 ago on Tue 18 Feb 2020 10:02:49 AM EST.
Available Packages
docker-ce.x86_64 3:19.03.6-3.el7 docker-ce-stable
NB: to see all available versions: dnf list docker-ce --showduplicates | sort -r
Install:
$ sudo dnf install docker-ce-3:19.03.6-3.el7
Error:
Problem: package docker-ce-3:19.03.6-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
Picking form the CentOS 7 repo: https://download.docker.com/linux/centos/7/x86_64/stable/Packages/
sudo dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
Try again:
sudo dnf install docker-ce-3:19.03.6-3.el7
All good so far:
$ sudo systemctl enable --now docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
$ docker --version
Docker version 19.03.6, build 369ce74a3c
A quick test:
$ sudo docker run -it --rm alpine:latest ping google.com -c3
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
c9b1b535fdd9: Pull complete
Digest: sha256:ab00606a42621fb68f2ed6ad3c88be54397f981a7b70a79db3d1172b11c4367d
Status: Downloaded newer image for alpine:latest
PING google.com (172.217.164.238): 56 data bytes
64 bytes from 172.217.164.238: seq=0 ttl=55 time=4.119 ms
64 bytes from 172.217.164.238: seq=1 ttl=55 time=4.250 ms
64 bytes from 172.217.164.238: seq=2 ttl=55 time=4.169 ms
--- google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 4.119/4.179/4.250 ms
NB: if there was an issue with DNS resolution within Docker containers, suggestion is that the firewalld must be disabled e.g. sudo systemctl disable firewalld
Add user to the docker group sudo usermod -aG docker $USER so can now run without sudo:
$ docker run -it --rm alpine:latest ping google.com -c3
PING google.com (172.217.1.174): 56 data bytes
64 bytes from 172.217.1.174: seq=0 ttl=55 time=4.093 ms
64 bytes from 172.217.1.174: seq=1 ttl=55 time=3.774 ms
64 bytes from 172.217.1.174: seq=2 ttl=55 time=3.871 ms
--- google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 3.774/3.912/4.093 ms
Installing Docker Compose
$ sudo curl -L https://github.com/docker/compose/releases/download/1.25.0/docker-compose-uname -s-uname -m -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
$ docker-compose –version
docker-compose version 1.25.0, build 0a186604