Centos下安裝docker教程_docker

通過yum安裝

需要root或者能sudo的許可權

yum封裝更新到最新

$ sudo yum update

添加Docker yum源

$ sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'[dockerrepo]name=Docker Repositorybaseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/enabled=1gpgcheck=1gpgkey=https://yum.dockerproject.org/gpgEOF

安裝Docker包

$ sudo yum install docker-engine

啟動Docker守護進程

$ sudo service docker start

通過測試鏡像運行一個容器來驗證Docker是否安裝正確

$ sudo docker run hello-worldUnable to find image 'hello-world:latest' locally  latest: Pulling from hello-world  a8219747be10: Pull complete  91c95931e552: Already exists  hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.  Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1.7.1cf5daeb82aab55838d  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.      (Assuming it was not already locally available.)   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  For more examples and ideas, visit:   http://docs.docker.com/userguide/

通過指令碼安裝

需要root或者能sudo的許可權

yum封裝更新到最新

$ sudo yum update

運行Docker安裝指令碼

$ curl -sSL https://get.docker.com/ | sh

這個指令碼會添加docker.repo倉庫並且安裝Docker

啟動Docker守護進程

$ sudo service docker start

通過測試鏡像運行一個容器來驗證Docker是否安裝正確

$ sudo docker run hello-world

建立一個Docker使用者組

docker守護進程綁定在Unix socket 而不是 TCP 通訊埠。預設情況下Unix socket屬於root使用者和具有sudo許可權使用者的使用範疇。出於這個原因，docker守護進程需要一直在root使用者下面運行。

To avoid having to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group.

為了避免運行docker命令的時候需要使用sudo命令，建立一個叫docker的Unix使用者組並將需要運行docker的使用者添加進去。當開始運行docker守護進程，會令docker使用者組的成員擁有Unix socket的讀寫權限。

建立docker使用者組並添加使用者：

1.需要root或者能sudo的許可權
2.建立docker使用者組並添加使用者

sudo usermod -aG docker your_username

3.退出並且登入到your_username，如果在your_username下也建議退出再重新登入一次，這確保您的使用者正在運行正確的許可權。
4.驗證運行docker已不再需要sudo命令

$ docker run hello-world

開機運行docker

$ sudo chkconfig docker on