海豹日記

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@sushi

- https://docs.docker.com/engine/install/ubuntu/
- Uninstall the Docker from the ubuntu repository.
```
for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
```
- add apt repository
```
# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
```
- Install the Docker
```
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
```
- Hello world
```
sudo docker run hello-world
```
- Add ubuntu user to the docker group
```
$ sudo gpasswd -a $USER docker
Adding user ubuntu to group docker
```
これで ubuntu ユーザで、docker　コマンドを実行できる。要ログオフ・ログイン

④Dockerのインストール