Linux下Docker的安裝

Linux下Docker的安裝

系統版本

 查看當前系統版本:

 cat /etc/redhat-release

 CentOS Linux release 7.5.1804 (Core) 

系統要求

Docker CE支持64位版本 Centos 7，而且要求內核版本不低於3.10。

卸載舊版本的Docker

sudo yum remove docker \
                 docker-client \
                 docker-client-latest \
                 docker-common \
                 docker-latest \
                 docker-lates-logrotate \
                 docker-logrotate \
                 docker-selinux \
                 docker-engine-selinux \
                 docker-engine

卸載完成以後接下來使用 yum 來安裝：

sudo yum install -y yum-utils \
                     device-mapper-persistent-data \
                     lvm2

添加yum 軟件源:

sudo yum-config-manager --add-repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo

安裝Docker CE

更新yum軟件源緩存，並安裝:
 sudo yum makecache fast
 sudo yum install docker-ce

使用腳本自動安裝:

curl -fsSl get.docker.com -o get-docker.sh
 sudo sh get-docker.sh --mirror Aliyun

執行完成這個腳本以後，docker ce 一切就準備就緒了，而且把 docker ce 的 edge 版本安裝在系統中。

安裝完成以後，啓動 Docker:

 sudo systemctl enable docker
 sudo systemctl start docker

創建 Docker 用戶組:

sudo groupadd docker     # docker是建立的docker組

創建完成以後，將當前登陸用戶添加到 docker 組中:

sudo usermod -aG docker $USER

已添加完成以後，退出當前終端並關閉，從新打開一個終端，測試Docker是否安裝成功:

docker run hello-world

 # 成功
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:0e11c388b664df8a27a901dce21eb89f11d8292f7fca1b3e3c4321bf7897bffe
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

添加內核參數，若是使用Docker的過程當中出現以下信息:

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

請添加內核配置參數以啓用這些功能:

sudo tee -a /etc/sysctl.conf <<-EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

而後從新加載:

sudo sysctl -p

加載成功以後顯示:

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1