Docker安装

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摘要

安装

CentOS/Ubuntu

（1）直接安装（版本较低）

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yum install docker

（2）安装高版本

Centos

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yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache

Ubuntu

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sudo apt -y install apt-transport-https ca-certificates curl software-properties-common
# aliyun
sudo curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
sudo apt -y update
# tencent
sudo curl -fsSL http://mirrors.tencent.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] http://mirrors.tencent.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
sudo apt -y update

列出Docker版本

Centos

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yum list docker-ce --showduplicates | sort -r

CentOS8 默认使用 podman 代替 docker ，所以需要 containerd.io

安装containerd.io

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yum -y install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm

Ubuntu

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sudo apt-cache madison docker-ce|awk '{print $3}'

安装指定版本

Centos

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yum install docker-ce-<VERSION_STRING>

Ubuntu

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sudo apt -y install docker-ce=5:19.03.15~3-0~ubuntu-focal

修改加速器，添加私有仓库，修改docker默认存储位置

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mkdir /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
    "data-root": "/data/docker",
    "registry-mirrors": ["https://ojtwovh1.mirror.aliyuncs.com"],
    "experimental": true,
    "log-driver":"json-file",
    "log-opts": {"max-size":"500m", "max-file":"5"}
}
# Ubuntu
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
    "data-root": "/data/docker",
    "registry-mirrors": ["https://ojtwovh1.mirror.aliyuncs.com"],
    "experimental": true,
    "log-driver":"json-file",
    "log-opts": {"max-size":"500m", "max-file":"5"}
}
EOF

启动

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systemctl start docker
systemctl enable docker

为了避免每次命令都输入sudo，可以设置用户权限

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sudo usermod -a -G docker $USER

在Alpine Linux安装

首先要注意 docker 的包是位于社区仓库里的，需要取消 community注释

image-20210428110620211

直接安装（最新版）

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apk add docker
apk add docker-compose

安装旧版本

安装一些依赖

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apk add --no-cache iptables ip6tables python3

创建docker的openrc文件

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cat > /etc/init.d/docker <<'EOF'
#!/sbin/openrc-run
supervisor=supervise-daemon

name="Docker Daemon"
description="Persistent process that manages docker containers"
description_reload="Reload configuration without exiting"

command="${DOCKERD_BINARY:-/usr/bin/dockerd}"
command_args="${DOCKER_OPTS}"
DOCKER_LOGFILE="${DOCKER_LOGFILE:-/var/log/${RC_SVCNAME}.log}"
DOCKER_ERRFILE="${DOCKER_ERRFILE:-${DOCKER_LOGFILE}}"
DOCKER_OUTFILE="${DOCKER_OUTFILE:-${DOCKER_LOGFILE}}"
supervise_daemon_args="--stderr \"${DOCKER_ERRFILE}\" --stdout \"${DOCKER_OUTFILE}\""

extra_started_commands="reload"

rc_ulimit="${DOCKER_ULIMIT:--c unlimited -n 1048576 -u unlimited}"

retry="${DOCKER_RETRY:-TERM/60/KILL/10}"

depend() {
        need sysfs cgroups
}

start_pre() {
        #checkpath -f -m 0644 -o root:docker "$DOCKER_ERRFILE" "$DOCKER_OUTFILE"
        echo ""
}

reload() {
        ebegin "Reloading configuration"
        $supervisor $RC_SVCNAME --signal HUP
        eend $?
}
EOF
## 授权可执行
chmod +x /etc/init.d/docker

## 下载docker-ce的二进制文件并释放到/usr/bin目录
curl -fsSL https://opentuna.cn/docker-ce/linux/static/stable/x86_64/docker-19.03.15.tgz | tar -xvz --strip-components 1 --directory=/usr/bin

修改配置

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mkdir /etc/docker
cat << EOF > /etc/docker/daemon.json
{
    "data-root": "/data/docker",
    "registry-mirrors": ["https://ojtwovh1.mirror.aliyuncs.com"],
    "experimental": true,
    "insecure-registries": ["192.168.0.2"],
    "log-driver":"json-file",
    "log-opts": {"max-size":"500m", "max-file":"5"}
}
EOF

添加自启并启动

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rc-update add docker boot
service docker start

如果启动报错failed to start daemon: Devices cgroup isn't mounted

执行以下脚本

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#!/bin/sh
# Copyright 2011 Canonical, Inc
#           2014 Tianon Gravi
# Author: Serge Hallyn <serge.hallyn@canonical.com>
#         Tianon Gravi <tianon@debian.org>
set -e

# for simplicity this script provides no flexibility

# if cgroup is mounted by fstab, don't run
# don't get too smart - bail on any uncommented entry with 'cgroup' in it
if grep -v '^#' /etc/fstab | grep -q cgroup; then
	echo 'cgroups mounted from fstab, not mounting /sys/fs/cgroup'
	exit 0
fi

# kernel provides cgroups?
if [ ! -e /proc/cgroups ]; then
	exit 0
fi

# if we don't even have the directory we need, something else must be wrong
if [ ! -d /sys/fs/cgroup ]; then
	exit 0
fi

# mount /sys/fs/cgroup if not already done
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

# get/mount list of enabled cgroup controllers
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

# example /proc/cgroups:
#  #subsys_name	hierarchy	num_cgroups	enabled
#  cpuset	2	3	1
#  cpu	3	3	1
#  cpuacct	4	3	1
#  memory	5	3	0
#  devices	6	3	1
#  freezer	7	3	1
#  blkio	8	3	1

exit 0

升级版本

停止容器服务

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systemctl stop docker

卸载原有容器

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yum -y remove docker \
docker-client \
docker-common

安装docker镜像源

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yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache

安装新版本

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yum install docker-ce-19.03.9-3.el7

修改存储路径

使用之前的数据目录，指定之前的储存目录，我们之前Docker的储存目录是 /data/docker

修改docker默认存储位置，配置镜像加速器，添加私有仓库地址

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cat << EOF > /etc/docker/daemon.json
{
    "data-root": "/data/docker",
    "registry-mirrors": ["https://ojtwovh1.mirror.aliyuncs.com"],
    "experimental": true,
    "insecure-registries": ["192.168.0.2"],
    "log-driver":"json-file",
    "log-opts": {"max-size":"500m", "max-file":"5"}
}
EOF

启动

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systemctl start docker
systemctl enable docker

升级之后可能存在的问题

以前Docker版本为1.13.1,，在对其版本升级到18.06.1之后，启动旧版本创建的容器时遇到这个错误：

查资料得知：因为「当您从不兼容的版本升级docker并且升级后无法启动docker容器时会出现这种情况」，解决办法如下：

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grep -rl 'docker-runc' /data/docker/containers/ | xargs sed -i 's/docker-runc/runc/g'
systemctl restart docker

/data/docker/containers/为docker存储目录

添加中文字体

由于某些项目需要用到中文字体

Dockerfile中添加

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COPY simsun.ttc /usr/share/fonts/simsun.ttc

执行以下命令查看系统中的中文字体

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fc-list :lang=zh

docker-compose安装

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#curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py && python3 get-pip.py
pip3 install docker-compose