第 1 章 Docker

下載 containerd.io https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

		
[root@localhost ~]# dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.13-3.2.el7.x86_64.rpm
		
		

安裝 Docker

		
[root@localhost ~]# dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo

[root@localhost ~]# dnf install -y docker-ce

[root@localhost ~]# systemctl enable docker
[root@localhost ~]# systemctl start docker
		
		

		
[root@localhost ~]# docker -v
Docker version 19.03.12, build 48a66213fe
		
		

			
curl -sL "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose			
			
			

			
yum install docker-io
service docker start
chkconfig docker on
docker pull centos:latest
docker images centos
			
		

test

			
docker run -i -t centos /bin/bash
			
		

從官方網站獲得最新社區版

			
yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum makecache fast
yum -y install docker-ce

systemctl start docker
			
		

測試安裝是否成功

			
docker run hello-world
			
		

Ubuntu 預設版本

			
$ sudo apt update
$ sudo apt install docker.io
$ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker
$ sudo sed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io
			
		

			
$ sudo docker run -i -t ubuntu /bin/bash
			
		

從官方網站獲得最新社區版

		
#!/bin/bash

sudo apt remove docker docker-engine

sudo apt install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common
	
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo apt-key fingerprint 0EBFCD88

sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
   
sudo apt update
sudo apt install docker-ce

apt-cache madison docker-ce
		
		

啟動參數配置 /etc/default/docker

		
neo@ubuntu:~$ cat /etc/default/docker
# Docker Upstart and SysVinit configuration file

#
# THIS FILE DOES NOT APPLY TO SYSTEMD
#
#   Please see the documentation for "systemd drop-ins":
#   https://docs.docker.com/engine/admin/systemd/
#

# Customize location of Docker binary (especially for development testing).
#DOCKERD="/usr/local/bin/dockerd"

# Use DOCKER_OPTS to modify the daemon startup options.
#DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"

# If you need Docker to use an HTTP proxy, it can also be specified here.
#export http_proxy="http://127.0.0.1:3128/"

# This is also a handy place to tweak where Docker's temporary files go.
#export DOCKER_TMPDIR="/mnt/bigdrive/docker-tmp"

		
		

啟動腳本 /etc/init/docker.conf

		
neo@ubuntu:~$ sudo cat /etc/init/docker.conf
[sudo] password for neo: 
description "Docker daemon"

start on (filesystem and net-device-up IFACE!=lo)
stop on runlevel [!2345]

limit nofile 524288 1048576

# Having non-zero limits causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
limit nproc unlimited unlimited

respawn

kill timeout 20

pre-start script
	# see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
	if grep -v '^#' /etc/fstab | grep -q cgroup \
		|| [ ! -e /proc/cgroups ] \
		|| [ ! -d /sys/fs/cgroup ]; then
		exit 0
	fi
	if ! mountpoint -q /sys/fs/cgroup; then
		mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
	fi
	(
		cd /sys/fs/cgroup
		for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
			mkdir -p $sys
			if ! mountpoint -q $sys; then
				if ! mount -n -t cgroup -o $sys cgroup $sys; then
					rmdir $sys || true
				fi
			fi
		done
	)
end script

script
	# modify these in /etc/default/$UPSTART_JOB (/etc/default/docker)
	DOCKERD=/usr/bin/dockerd
	DOCKER_OPTS=
	if [ -f /etc/default/$UPSTART_JOB ]; then
		. /etc/default/$UPSTART_JOB
	fi
	exec "$DOCKERD" $DOCKER_OPTS --raw-logs
end script

# Don't emit "started" event until docker.sock is ready.
# See https://github.com/docker/docker/issues/6647
post-start script
	DOCKER_OPTS=
	DOCKER_SOCKET=
	if [ -f /etc/default/$UPSTART_JOB ]; then
		. /etc/default/$UPSTART_JOB
	fi

	if ! printf "%s" "$DOCKER_OPTS" | grep -qE -e '-H|--host'; then
		DOCKER_SOCKET=/var/run/docker.sock
	else
		DOCKER_SOCKET=$(printf "%s" "$DOCKER_OPTS" | grep -oP -e '(-H|--host)\W*unix://\K(\S+)' | sed 1q)
	fi

	if [ -n "$DOCKER_SOCKET" ]; then
		while ! [ -e "$DOCKER_SOCKET" ]; do
			initctl status $UPSTART_JOB | grep -qE "(stop|respawn)/" && exit 1
			echo "Waiting for $DOCKER_SOCKET"
			sleep 0.1
		done
		echo "$DOCKER_SOCKET is up"
	fi
end script
		
		
		

		
neo@MacBook-Pro ~ % docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:2557e3c07ed1e38f26e389462d03ed943586f744621577a99efb77324b0fe535
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/

neo@MacBook-Pro ~ % docker image ls 
REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
hello-world                                latest              fce289e99eb9        2 months ago        1.84kB

neo@MacBook-Pro ~ % docker container ls --all
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS                          PORTS               NAMES
ea694b443e9e        hello-world         "/hello"            About a minute ago   Exited (0) About a minute ago                       dreamy_feistel
		
		

		
docker stop $(docker ps -a -q)
docker rm -f $(docker ps -a -q)
docker rmi -f $(docker images -q)
docker volume rm $(docker volume ls -q)